Homeowner Guide: Understanding and Running Your Heat Pump.
This guide is for homeowners who are considering a heat pump or who already have one installed. It explains how heat pumps work, how to run them correctly, and what good installation practice looks like.
Whether your system is air source, ground source, or water source, the principles are the same. The only difference is where the heat comes from and how it’s delivered into our homes.
One System, Different Heat Sources
All heat pumps work by moving heat, not creating it.
Air source: collects heat from outside air.
Ground source: collects heat from the ground via buried pipes.
Water source: collects heat from rivers, lakes, or groundwater.
Once the heat is collected, everything inside your home works in the same way.
Heat is upgraded using electricity.
Heat is delivered to radiators, underfloor heating, blower unit or to heat water.
The system runs slowly and efficiently.
How a Heat Pump Should Be Run.
Heat pumps are designed to provide steady background warmth, not short bursts of high heat.
Best practice.
Leave the system running continuously during cold weather.
Use lower flow temperatures than a boiler.
Avoid frequent on/off cycling.
Let the controls do the work.
If your home feels warm, but the radiators are only warm to the touch, that’s normal and correct.
1. Run Low and Steady.
A heat pump works best when it runs continuously at a low output rather than blasting heat in short bursts. Unlike traditional boilers, heat pumps are designed to maintain a stable indoor temperature over time. Steady operation improves comfort, reduces energy use, and puts less strain on the system.
2. Avoid Constant On/Off Cycling.
Frequent stopping and starting reduces efficiency and increases wear on components. A well-designed heat pump should modulate its output to match the home’s heat loss instead of repeatedly switching on and off. Longer run times at lower power are healthier for the system and cheaper to run.
3. Lower Flow Temperatures Improve Efficiency.
Heat pumps become more efficient at lower flow temperatures. Running your system at 35–45°C instead of “high boiler” style temperatures allows the heat pump to operate at its best performance. Larger radiators or underfloor heating help deliver comfortable warmth even at these lower temperatures.
4. Let the Controls Do the Work.
Smart controls and weather compensation are key to efficient heat pump operation. The system should automatically adjust its output based on outdoor conditions and the home’s heating demand. Constantly turning thermostats up and down can actually reduce efficiency and comfort.
5. Comfort Comes from Consistency.
A properly designed heat pump system delivers an even, gentle warmth throughout the home. Instead of dramatic temperature swings, you get stable comfort, lower running costs, quieter operation, and a system that lasts longer. The goal is not fast heat, it’s efficient, balanced comfort all day long.
Heating Curve (Flow Temperature Settings)
The heating curve controls how hot the water is that flows to your heating system, based on outdoor temperature. You will find your heating curve on the heat pump control panel or external monitoring devices if installed. Always discuss with installers and ask to be shown how to use/control.
Typical Curve.
Colder outside = slightly hotter water
Milder outside = cooler water
Why this matters.
Lower temperatures = higher efficiency
Higher temperatures = higher running costs
A well-set heating curve.
Keeps rooms comfortable
Avoids overheating
Maximises efficiency
This is usually set during commissioning and may need fine-tuning once you’ve lived with the system.
Weather Compensation
Weather compensation is what allows a heat pump to think ahead. An outdoor sensor monitors temperature and automatically adjusts the heating curve.
Most modern air source heat pumps come with built-in sensors on the outdoor unit to monitor ambient temperature for efficient operation, such as managing defrost cycles. While these built-in sensors measure conditions at the unit, they are often affected by the machine’s own heat, making external, wall-mounted sensors more accurate for weather compensation.
More stable indoor temperatures
No sudden hot or cold swings
Better comfort and lower running costs
If weather compensation is disabled, the system may behave more like a boiler, which reduces efficiency.
What this means in practice.
On a cold day (around –5°C), the system might send water out at ~45°C.
On a mild day (around 15°C), it may only need ~25°C.
The system adjusts continuously, not in jumps.
Outdoor Unit Location (Avoiding Recirculation)
For air source heat pumps, correct positioning is critical.
The unit must.
Have clear airflow in front and behind.
Be away from walls, corners, or enclosed spaces.
Avoid recycling its cold exhaust air.
Poor positioning can cause recirculation, where cold air is pulled back into the unit, reducing performance and increasing noise and running costs.
Isolation valves are essential for maintenance and safety.
You should have:
Valves on flow and return pipes.
Valves near the heat pump.
Valves near key components (buffer, cylinder).
These allow:
Easier servicing.
Fault isolation.
Reduced disruption if work is needed.
Missing or inaccessible valves are a common quality issue.
Anti Freeze valveShut Off ValvesPoor Insulation
MCS Standards , What Homeowners Should Expect.
In the UK, heat pumps installed under grants (BUS, ECO4) must meet MCS standards.
This includes:
Proper system design and heat loss calculations.
Correct heat pump sizing.
Suitable radiator or underfloor heating upgrades.
Weather compensation enabled.
Commissioning and handover documentation.
You should receive:
MCS certificate
User controls explanation
System settings at handover
For illustration only.
Microgeneration Certification Scheme (MCS) is a UK-based “stamp of approval” for small-scale renewable energy technology. It acts as a quality mark, confirming that products (like solar panels or heat pumps) and installers meet strict standards for safety, performance, and reliability. The MCS stamp is certifying the installers, just like Gas Safe would certify a gas engineer.
The Big Picture
Heat pumps are not just a new appliance, they are a different way of heating a home.
They work best when:
Insulation is good
Ventilation is considered
Controls are understood
The system is allowed to run steadily
Once set up properly, all heat pumps, air, ground, or water deliver the same result:
Efficient, low-carbon, comfortable heating for modern homes.
Is it a fair COP or Scop! Understanding above 100%!
Heat pump Basics.
If you’re considering replacing your current heating and hot water system with a renewable alternative, it’s essential to be aware that this can be a significant investment. In many cases, it involves a partial or complete system upgrade, as heat emitters often (though not always) need to be updated to achieve optimal flow rates.
To determine if a heat pump is suitable for your property, you can consult the UK government’s suitability guide. The MCS best practice is here.
The primary types of heat pumps used in the UK include:
ASHP: Air Source Heat Pumps.
WSHP: Water Source Heat Pumps.
GSHP: Ground Source Heat Pumps.
A hybrid system is another option to consider, where a fossil fuel-powered boiler (like gas) works alongside a heat pump. This setup can help meet increased heating demands during the colder winter months while still reducing overall reliance on non-renewable energy sources.
How Heat Pumps Work.
Heat pumps don’t generate heat — they move it. They take warmth from the air, ground, or water and bring it into your home using a clever refrigeration cycle (a bit like a fridge that removes heat from the food but working in reverse).
The Different Types of Heat Pumps.
Although all heat pumps work on the same principle, they collect heat in different ways:
Air Source Heat Pumps (ASHP) These draw heat from the outside air using a unit that looks similar to an air conditioner — because it almost is one, just working the other way around.
Water Source Heat Pumps (WSHP) These collect heat through coils or mats placed under the surface of a pond, lake, or river.
Ground Source Heat Pumps (GSHP) These use long loops of pipe buried in the ground — either horizontally about 2 metres deep or vertically down boreholes reaching around 100 metres.
Once the heat is gathered, it’s transferred into your home through radiators, underfloor heating or blower units, depending on your home’s design and comfort preference.
This technology is new to many of us, and it needs to be used a little differently.
During the heating season, it’s best to control your home’s temperature rather than demand it. In other words, let the system maintain a steady temperature instead of turning it off and on all the time. It’s more efficient (and cheaper) to let the heat pump gently adjust the temperature up or down.
Most modern systems use outdoor temperature sensors to help with this. These sensors measure the air temperature outside and tell the heat pump how much heat your home is likely to need. On mild days, the system runs at a lower level; when it’s colder, it automatically increases output. This helps your heat pump work in tune with the weather — keeping your home comfortable while using less energy overall.
Position.
Away from sleeping and noise-sensitive areas. (newer ASHPs are very quiet). Making sure the area around the heat pump is to manufacturers guidance to allow optimum airflow and service needs.
Condensation removal.
Water will come from the unit and can pool. It’s not the same as gas boiler condensate, which can be acidic, so just basic removal to soak away or drain, depending on the manufacturer’s instructions.
Radiator sizes and pipework.
Heat pumps work at lower temperatures, so a bigger surface area, ideally underfloor heating, is beneficial. (see Delta T in main section)
Insulation of property.
The better the wall and loft (or room in roof) insulation, the less heat loss.
How regular servicing is required and access requirements.
Running costs. What is the average yearly cost to run the heat pump! This can be really important, and research and information from your installer is a must.
Solar matching.
As heat pumps operate differently through the seasons, the same goes for solar. If you are having solar PV installed thinking the panels will run the heat pump, then think again. You could try to match the solar generation to the heat pumps output, which could help with running costs.
Understanding Heat Pump Efficiency: SCOP and COP.
When looking at heat pumps, you’ll often see the terms COP and SCOP. These are simply ways of measuring how efficiently your system turns electricity into heat.
COP — Coefficient of Performance.
Measures efficiency at one moment in time — usually in perfect test conditions.
For example, a COP of 4 means that for every 1 unit of electricity the heat pump uses, it provides 4 units of heat. However, real life isn’t always perfect — temperatures change, systems switch on and off, and conditions vary throughout the year. That’s where SCOP comes in.
SCOP — Seasonal Coefficient of Performance. Gives a more realistic picture of your heat pump’s efficiency over an entire heating season.
It takes into account:
Changing outdoor temperatures as the weather warms and cools.
Energy used during standby and defrost cycles.
How efficiently the system runs at different power levels.
In short, SCOP tells you how efficient your heat pump is across the whole year, not just in ideal lab conditions.
How is SCOP Is Calculated?
SCOP compares how much heat energy your system produces with how much electricity it uses:
SCOP = Total Heat Output ÷ Total Electricity Used
Example.
If your heat pump has a SCOP of 4, that means for every 1 kWh of electricity it uses, it provides 4 kWh of heat. That’s why people often say a heat pump can be “400% efficient” It’s not creating energy, just moving it very efficiently.
Privately installed or funded?
For any renewable heating project, whether funded privately or through a UK funded scheme, the current best practices, manufacturer’s instructions and relevant building regulations should be strictly adhered to. If installed on a UK grant scheme then a quality assurance program that certifies small-scale renewable energy systems and installers need to be followed, currently this is called MCS if insulation is being carried out at the same time and as part of the funding then it must meet the current PAS. Most of the time when applying for renewable funding the installation company usually has the mechanism to set up the funding and this should be explained from the start. You should NOT have to pay anything upfront or post installation unless extras are quoted and agreed. These extras could be, for instance, larger capacity water heating, radiators as required, location requirements etc.
Have a look at the funding area of the site for more information especially the changes to the ECO scheme.
Installation Guide.
The manufacturer’s instructions will highlight any regulations that are required. Currently, all electrical regulations need to be followed and documented, as is the set out by MCS if installed on a government funded scheme. Requirements are that properties are well insulated prior to the installation (fabric first approach) and full heat loss calculations are carried out to provide information to install the system to best practice.
Installing a Heat Pump to Best Practice.
A well-installed heat pump should run efficiently, quietly, and comfortably for many years. Good design, careful installation, and proper commissioning are just as important as the heat pump itself.
1. Plan and Assess the Property.
Before installation begins, the home should be properly assessed to make sure the system is suitable and correctly sized.
Key checks:
Carry out a full heat loss calculation.
Assess insulation levels and airtightness.
Check radiator sizes and suitability.
Consider hot water demand.
Identify the best location for indoor and outdoor units.
Ensure adequate electrical supply capacity.
Why it matters:
Oversized or undersized systems can lead to poor efficiency, cycling, comfort issues, and higher running costs.
2. Install the Outdoor Unit Correctly.
The outdoor unit needs good airflow, stable mounting, and careful positioning.
Best practice:
Install on a solid, level base.
Allow sufficient clearance around the unit.
Avoid enclosed spaces or restricted airflow.
Minimise vibration and noise transmission.
Position away from bedroom windows where possible.
Ensure easy servicing access.
All pipework to be fully insulated with a UV protection class of insulation.
Why it matters:
Poor placement can reduce efficiency, increase noise, and shorten system lifespan.
3. Install Indoor Components with Care.
Pipework and internal components should be installed neatly and efficiently.
Best practice:
Keep pipe runs as short as possible.
Insulate all heating pipework properly.
Avoid unnecessary bends and fittings.
Install quality valves and controls.
Ensure condensate drainage is correct.
Mount components securely and accessibly.
Why it matters:
Good pipework design reduces heat loss and improves overall system performance.
4. Integrate Properly with the Heating System.
The heat pump should work smoothly with the home’s emitters and controls.
Best practice:
Balance radiator and underfloor circuits.
Set correct flow rates.
Remove air from the system thoroughly.
Use hydraulic separation or buffers only when needed.
Configure weather compensation correctly.
Optimise flow temperatures for efficiency.
Why it matters:
A properly balanced system delivers stable comfort and lower running costs.
5. Commission the System Thoroughly.
Commissioning ensures the heat pump operates as designed.
Key commissioning checks:
Verify flow and return temperatures
Check refrigerant and system pressures
Test pumps, valves, and sensors
Confirm weather compensation settings
Check defrost operation
Measure system performance
Record all commissioning data
Why it matters:
Incorrect commissioning is one of the biggest causes of poor heat pump performance.
6. Handover and Aftercare
Homeowners should understand how the system works and how to run it efficiently.
Best practice:
Explain controls clearly.
Advise against frequent on/off adjustments.
Provide user manuals and documentation.
Register warranties.
Discuss servicing requirements.
Offer ongoing support if needed.
Why it matters:
Heat pumps work best when run steadily at lower temperatures. User understanding makes a major difference to comfort and efficiency.
Best Practice Checklist.
Correct heat loss calculation.
Properly sized heat pump.
Good airflow around outdoor unit.
Well-insulated pipework.
Balanced heating system.
Weather compensation enabled.
Low flow temperatures configured.
Full commissioning completed.
Homeowner guidance provided.
Regular servicing planned.
All warranties and registration complete.
The Benefits of Best Practice Installation.
When installed properly, a heat pump can provide:
Lower running costs
Better comfort
Stable indoor temperatures
Quiet operation
Improved efficiency
Longer system lifespan
Reduced maintenance issues
Lower carbon emissions
If hot water is being heated in storage tanks by the heat pump then steps need to be taken to protect from legionella. Stored hot water systems connected to heat pumps have cycles to heat the water at given times and a given temperature to stop the growth of Legionella bacteria.
Electrical certificates.
The two types of electrical certificates you will come across as a customer who is having any electrical work as part of installing EEM’s (energy efficient measures)
Electrical Installation.
Minor Works Certificate.
Electrical Installation Certificate.
An electrical installation certificate is the type of certificate a customer receives after an electrician has installed one or more new circuits. Other examples include a complete rewire, a replacement consumer unit or an additional consumer unit. Generally, any time electrical work is done at the consumer unit, a new installation certificate will be issued.
Minor Works Certificate.
A minor works certificate is issued after an electrician has made an alteration to an existing circuit. Minor works certificates are often used to certify work such as adding additional sockets to an existing circuit or increasing the number of light fittings in a room. It can also be where a fused spur has been installed for an appliance or boiler connection.
Final Thought.
The best heat pump installations focus on steady operation, low flow temperatures, good controls, and careful system design. A quality installation is what turns a heat pump from “just working” into delivering real comfort and efficiency for the long term.
Selecting a trustworthy installer for your heating, insulation, or renewable energy project requires careful research and due diligence.
Hiring the right professional ensures your home is safe, efficient, and compliant with regulations, and helps protect warranties, insurance, and grant eligibility.
Reputable installers are often accredited by recognised trade bodies or professional organisations. Accreditation confirms that the installer:
Meets industry standards
Has undergone proper training
Is legally authorised to perform specific types of work
NAPIT – Covers electrical and heating installations.
NICEIC – Approved contractor scheme for electrical work.
MCS – Microgeneration Certification Scheme – Required for heat pumps, solar PV, and renewable energy installations. Using accredited installers is essential for compliance, safety, and accessing grants or incentives, such as the UK Boiler Upgrade Scheme (BUS) or ECO4 funding.
Find a Qualified Retrofit Installer
Select the work you want carried out on your home.
This guide shows the qualifications, certifications and governing bodies
a competent installer should hold.
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Being registered with the above does not always mean the work is checked by the certification company, It usually shows competence within the field of current health & safety practices and current regulations. Remember that if you have any work carried out at your property either on a grant scheme or self financed you should be covered by consumer rights. The citizen’s advice is always a good place for information.
Some of the below will help with your journey in finding trades.
If you feel you are vulnerable.
Try to get a family member or neighbour to sit in with you when getting quote visits, also maybe designate someone else to deal with the process.
Ask for Recommendations.
Seek recommendations from friends, family, or colleagues who have recently had similar work done. Personal recommendations can be invaluable in finding trustworthy installers.
Read Reviews and Testimonials.
Check online reviews and testimonials on platforms like Trustpilot, Checkatrade, or Which? Trusted traders and google reviews. These platforms often provide insights into the quality of work and customer satisfaction, But please be aware that not all reviews can be genuine!
Obtain Multiple Quotes.
Don’t settle for the first installation company you find. Obtain quotes from multiple companies for comparison. Be wary of quotes that are significantly lower than others, as they may indicate subpar workmanship or the use of inferior materials. If you are applying down a grant funded route, then be weary of being promised the earth or pushed into signing up. Any decent installation company should keep you at ease and answer all your questions honestly.
Verify Insurance and Guarantees.
Ensure that the installation company/individual has adequate insurance coverage, including public liability insurance, to protect you and your property in case of accidents or damage. Also, inquire about any guarantees or warranties offered for the work they perform.
Check for Compliance with Regulations.
Certain types of work, such as electrical or gas installations, require compliance with specific regulations and safety standards. Verify that the installers you choose are appropriately qualified and registered to carry out such work.
Communicate Clearly.
Communicate your expectations clearly, including timelines, budget constraints, and any specific requirements you may have. Reputable installers will be transparent and be responsive to your needs.
Trust Your Instincts.
If something feels off during your interactions with installers or if they seem unwilling to provide necessary information or documentation, trust your instincts and consider looking elsewhere.
Get Everything in Writing.
Once you’ve decided on an installation company, make sure to get all agreements, including costs, timelines, replacement of fixings (window sills, skirting etc) redecorating and scope of work, in writing. This helps protect both parties and ensures clarity and accountability throughout the project.
External Wall Insulation can significantly change the look and function of your property, so it’s important to understand the process in detail before work begins. Confirm what insulation system will be used, its thickness, and the finish type (e.g. render, brick-slip, or cladding). Ask how the installers will deal with fixtures and features such as satellite dishes, alarm boxes, lights, air vents, overflow pipes, and external taps—these should all be properly removed, extended, and reinstated, not simply covered over.
Openings and Details.
Discuss how the system will accommodate windows, doors, and sills, as these may need to be extended or replaced to ensure proper sealing and to prevent water ingress. Check that drip beads, stop beads, and corner trims will be installed neatly and to specification for a high-quality, durable finish.
Ventilation and Airflow.
Make sure that ventilation and airbricks are not blocked or removed. Ask how they will be extended through the insulation system to maintain airflow and prevent damp or condensation. Obtain a clear ventilation specification, and ensure the finish matches or complements your property’s appearance. For homes with fireplaces or open flues, ask about spillage testing and combustion ventilation to ensure safety and compliance.
Groundworks and Damp-Proof Course.
Confirm that the insulation will finish above the damp-proof course (DPC) and that appropriate base trims and drainage channels will be installed. The system should not bridge the DPC unless designed to do so, as this can lead to moisture problems. Ensure that any existing damp or drainage issues—including blocked gutters or damaged downpipes—are addressed before insulation begins.
Aesthetics and Boundaries.
If your home is part of a terrace, semi-detached, or adjoins another property, ask how the system will terminate at party walls, fences, or neighbouring structures. Ensure that detailing will be neat and watertight. For listed buildings or properties in conservation areas, confirm that planning permission or building consent is in place. Regulations change so what may of been permitted last year may not be now, and visa versa!.
Safety and Compliance.
For homes with chimneys, fireplaces, or combustion appliances, ask about spillage tests and combustion ventilation to ensure safety after the installation.
Documentation and Clean-Up.
Request written details of all materials, fixings, and finishes, including manufacturer names and warranty information. Confirm that all waste and debris will be removed and agree on a timeline for completion and clean-up.
Finally, ensure you have full contact information for everyone involved in the project, including the installation team, project or site manager, and—if installed through a UK grant scheme, the Retrofit Coordinator responsible for oversight and compliance.
Internal Wall Insulation (IWI) and Room-in-Roof Considerations.
Disruption and Reinstatement.
Internal Wall Insulation can be highly disruptive, often requiring the removal of features such as skirting boards, window sills, coving, door frames, electrical sockets, light fittings, and radiators. Confirm that your installer will reinstate all removed items and specify whether they will be restored or replaced. Ensure that qualified tradespeople—such as joiners for woodwork and plumbers for wet work—will carry out these tasks, and get this commitment in writing.
System and Detailing.
Ask which insulation system will be used and how the installer plans to treat complex areas such as coving, cupboards, or meter locations. For room-in-roof spaces, confirm that any loft or eaves hatches will be properly insulated and professionally fitted, not simply boarded over. If you use roof storage, ensure this area remains accessible and structurally suitable for use once insulated.
Check that all electrical, alarm, TV, satellite, and internet cables will be correctly routed through the insulation and fully reinstated afterwards.
Ventilation and Safety.
A ventilation system should be installed as part of the works. Obtain a detailed specification to confirm it meets high standards of performance and finish. For homes with fireplaces or open flues, ask about spillage testing and combustion ventilation to ensure safety and compliance.
Pre-Installation Checks and Documentation.
Before work begins, inspect the external walls, damp-proof course, gutters, and downpipes. Any existing issues must be identified and either rectified by the installer or formally agreed with you in writing, as they can compromise insulation performance and cause long-term problems.
Finally, confirm that all debris will be cleared and agree on a timeline for completion and cleanup. Request full contact details for everyone involved, including the office manager, installation team (noting if subcontractors are used), and—if the work is part of a UK grant scheme—the Retrofit Coordinator overseeing the project.
Cavity Wall Insulation considerations.
Scope and Drilling.
Confirm that all suitable wall areas will be insulated, which may involve internal drilling. Discuss in advance where drilling will occur and what materials will be used to fill and finish the holes afterwards to ensure a neat appearance.
Garages and External Finishes.
For attached but unheated garages, talk through insulation options—particularly if shelving, cupboards, or other fixtures will need to be removed or adjusted. When drilling into external walls, ask what colour of mortar will be used to fill the holes, especially on rendered or painted surfaces. Confirm whether installers will repaint or touch up the finish to match the existing façade.
Material and Clean-Up.
Find out exactly which insulation material is being used and take the time to research its properties and suitability for your home. Clarify whether the installation team will be responsible for cleaning up spills, dust, or debris, and have this commitment documented in writing. If you have outdoor features such as ponds or livestock areas, inform the installers so they can take precautions against overspill.
Ventilation and Safety.
If new ventilation is required, request a clear specification and ensure all installations are completed to a high standard of finish. For homes with fireplaces or open flues, ask about spillage tests and combustion ventilation to maintain safety and compliance.
Pre-Installation Checks and Aftercare.
Inspect external walls, damp-proof courses, gutters, and downpipes before work begins. Any existing damp or drainage issues must be resolved first, as they can undermine the effectiveness of the insulation and lead to long-term problems. Finally, confirm that all debris will be removed and agree on a clear timeline for completion and cleanup—especially important for removal and refill projects.
It can be challenging to assess conditions beneath the floor unless you have a basement. Confirm the type, thickness, and support method of insulation being installed, and ensure all accessible areas will be covered. If floorboards need to be lifted, be aware this can cause damage—ask whether replacements will match the original boards to maintain appearance and consistency. Take pre-installation photographs for reference.
Cross Ventilation.
Adequate underfloor ventilation is essential. Make sure any existing vents or decorative grilles are retained or replaced with alternatives that are both functional and visually appropriate. Request written confirmation of how cross-flow ventilation will be maintained or improved, including details of the units being installed. The system should allow sufficient airflow to prevent moisture buildup and stop water ingress.
Basement Insulation.
If a basement is being insulated, ask about fire safety compliance and verify that all work adheres to current building regulations. It’s worth doing your own research for added assurance.
Ventilation and Safety.
If a ventilation system is included, obtain a detailed specification and confirm it will be installed to a high standard. For properties with fireplaces, request information on spillage tests and combustion ventilation to ensure safety and compliance.
Pre-Installation Checks and Cleanup.
Inspect external walls, damp-proof courses, subfloor ventilation, and rainwater systems (gutters, downpipes, etc.) before work begins. Any existing damp or drainage issues must be resolved first, as they could compromise the insulation and cause long-term damage. Finally, confirm that all debris and waste materials will be removed and agree on a clear timeline for completion and cleanup.
Ask which insulation materials will be used—such as spray foam, mineral wool, or PIR boards—and make sure you understand their limitations and how they may affect your property’s insurance or mortgage eligibility.
Access and Storage.
Discuss how the installation will impact access to essential services in the loft, such as boilers or solar inverters, and whether storage areas will still be usable or need adjustment.
Electrical Safety.
If you have recessed down lights, these must be properly protected to prevent air leakage and potential overheating. Suitable covers or fire-rated caps should be used. For electric showers or other circuits with cables running through the loft, ensure proof is provided that the cables are not buried within insulation, as this can cause overheating.
Pipework and Loft Hatches.
All exposed water pipes should be fully insulated. The loft hatch should also be insulated and drought-proofed to a professional standard—avoid makeshift solutions like loosely stapled insulation.
Ventilation and Timber Protection.
Adequate airflow in the loft is essential to prevent condensation and protect the roof timbers. Confirm that ventilation will be maintained or improved as part of the work.
Whole-Home Ventilation and Safety.
If a new ventilation system is being installed, request a clear specification to ensure it meets high-quality standards and finishes. For homes with open fireplaces, ask about spillage tests and combustion ventilation to ensure safety and compliance.
Most combination boilers need a larger gas supply pipe than older systems, often requiring an upgrade from the meter. Before installation, confirm the planned gas pipe route to avoid unnecessary external runs if an internal route is possible. If the pipe must run outside, ensure it’s properly clipped and installed in line with regulations.
Heating Controls.
Discuss your heating controls and where the thermostat will be located. It should be positioned in a room without a thermostatic radiator valve (TRV) or any secondary heat source such as a fire or cooker, to ensure accurate temperature readings.
Condensate Drainage.
All condensing boilers produce condensate that must be drained safely. Ideally, this drainage point should be located indoors. If the condensate pipe must run externally, it needs to be insulated with Class 0 lagging. Confirm the type of insulation being used and how it will be secured and supported.
System Clean and Preparation.
Ensure all debris will be removed during installation and clarify when this will happen. Most boiler manufacturers require a full system flush before fitting the new unit—this is essential. Make sure the installer carries it out, and ideally, observe the process. The correct use of cleaning and inhibitor chemicals is vital for system health, and their use should be recorded in the Benchmark log (the boiler’s installation and service record). Ask for a copy for your files.
Warranty and Guarantees.
Confirm both the manufacturer’s warranty and the installer’s guarantee, particularly regarding leaks and workmanship. Once the boiler is installed, it’s a good idea to call the manufacturer directly after a few weeks to confirm that your warranty is fully registered and active.
You may already know the direction your property faces, but installers might suggest positioning the panels differently. This could be due to access issues, roof condition, or other practical constraints. However, the optimum orientation delivers the best performance, so make sure your installer prioritises efficiency over convenience.
Inverter Location.
The inverter should be installed somewhere easy to access for inspection, servicing, and maintenance, while also being protected from the elements. Some models are suitable for outdoor installation, provided they’re shielded from direct sunlight and rain. If you live near the coast, ask about corrosion resistance and whether additional protection is needed.
Monitoring Meter.
The generation meter (monitoring meter) should be positioned where it can be easily read and checked regularly. Make sure it’s visible enough to monitor energy production and detect early signs of faults (for example, if it isn’t blinking in daylight). Some installers may say it has to go in loft if inverter is also installed there, but dont allow, have it somewhere you can read and check.
Paperwork and Certification.
Confirm the expected timescales for all necessary documentation, including MCS certification, DNO approval, and any paperwork your energy supplier may require.
Warranties and Guarantees.
Clarify the warranty terms and guarantee lengths for all equipment. Make sure you know who to contact in case of faults or system failure.
Get Everything in Writing.
Once you’ve decided on a installation company, make sure to get all agreements, including costs, timelines, and scope of works, in writing. This helps protect both parties and ensures clarity and accountability throughout the project.
Ask your installer to explain which make, model of heat pump is being fitted and why it’s suitable for your property. Confirm that the system has been properly sized for your home, an undersized or oversized unit can reduce efficiency and increase running costs. Request a full design calculation (MCS or equivalent) showing heat loss per room, flow temperatures, and emitter sizing. Ask what refrigirant is used within the pump (R32, R290 etc). Ask about hybrid systems to help in the winter months.
Outdoor Unit Location.
The external unit should be positioned where airflow is unrestricted, but noise and vibration will not affect you or neighbours. It must sit on a stable, level base (often a concrete pad with anti-vibration plinth) and be clear of obstructions such as fences or foliage. If located near boundaries, confirm it meets local noise regulations and planning guidance. It should meet manufactures clearances for optimum airflow. For coastal or exposed locations, ask about corrosion-resistant finishes and protective coatings. (if within 2000m from the coast this is a must)
Internal Components.
Confirm where the indoor cylinder, buffer tank, and controls will be located. These should be easily accessible for servicing and maintenance, with pipework neatly installed and insulated. Discuss how existing systems—such as radiators or underfloor heating will be adapted or replaced, and ensure the flow and return pipe sizes are appropriate for the new system.
Condensate and Drainage.
Heat pumps produce condensate water, particularly in colder weather. This must be drained safely away from the base unit, ideally into a proper soakaway or drain. The pipework must not freeze, so confirm that suitable insulation and gradients are in place. The condensate produced is not the same a a combustion boiler so it is not acidic.
Electrical and Controls.
Ensure the electrical supply is adequate and compliant with regulations, with a dedicated isolator switch. Ask about the control system whether it will use smart thermostats, weather compensation, or load compensation and how to use these features for maximum efficiency.
Groundworks and Protection.
If installing a ground source heat pump, confirm the ground loop layout (horizontal trenches or boreholes), and request documentation of where pipes are buried for future reference. For air source units, confirm that rainwater runoff from roofs won’t drip onto the unit and that the area around the base remains well-drained and clear of standing water.
Warranties, Maintenance, and Support.
Ask for details of warranties and service agreements for both the equipment and installation. Heat pumps require annual servicing to maintain performance and warranty validity, so ensure you receive a maintenance schedule and the installer’s or manufacturer’s contact details.
Paperwork and Certification.
Ensure you receive all necessary documentation, including MCS certificates,DNO notifications, and user manuals. These are essential for warranty registration, grant schemes (such as the Boiler Upgrade Scheme), and resale value.
Cleanup and Completion.
Confirm that all debris and packaging will be removed and agree on a clear completion timeline. Obtain written contact details for the installation company, lead installer, and if installed through a UK grant scheme the Retrofit Coordinator responsible for the project.
Meters need to be equipped with a unique reference to allow the collection of bills.
MPAN (Meter Point Administration Number) sometimes called an “Electricity Supply Number” is a unique 12-digit number that identifies the specific electricity supply point for a property in the UK. It’s used by electricity suppliers and network operators to ensure energy is correctly tracked and billed.
DNO (Distribution Network operator) Is a company that owns and manages the local infrastructurelike power lines, underground cables, and substations that deliver electricity to homes and businesses. Unlike your energy supplier, which sends your bill, the DNO is responsible for maintaining the physical network, fixing power outages, and handling new connections.
What an MPAN number does.
It tells energy companies exactly where electricity is delivered, similar to an address for your power connection. It will appear on your electricity bill and will usually be found in a box labelled “MPAN” or “Supply Number,” typically in the bottom section of your bill. This number is issued by your local Distribution Network Operator (DNO) Each DNO manages supply points in its region.
What is a DNO?
Across the UK, the electricity network is separated into individual regional areas, with each regional electricity grid controlled by the local Distribution Network Operator (DNO). Each regional grid is connected to the main National Grid. Within their respective areas, each DNO controls and operates substations that transmit electrical power to all users, including homes and businesses. When we generate power through solar, or we are taking from the network with the likes of heat pumps, the DNO needs to make sure we are not sucking too much power or pushing too much power back down the power lines.
Who are the UK’s DNOs?
Energy Networks Association, highlights how the UK’s electricity network is divided. The seven DNOs are as follows:
The light energy frees electrons, creating a Direct Current (DC) flow of electricity.
A photovoltaic system consists of PV cells, which are grouped into modules (solar panels) and arranged into arrays.
They contain cells, usually made of silicon, that release electrons when hit by sunlight, creating a flow of electricity. An inverter converts this power into the standard electricity used for appliances, helping lower energy bills
Solar PV basics.
Solar panels provide an eco-friendly and sustainable method for power generation, as they harness sunlight and produce no direct greenhouse gas emissions during use. They are utilized globally to lower electricity costs, reduce dependence on fossil fuels, and minimize the carbon footprint associated with energy production.
Over the past 20 years, solar power has seen significant advancements in both affordability and technology, including improved energy transfer and storage capabilities. For solar energy to be truly beneficial in the UK, it is essential to either store the generated energy using batteries or feed the excess power back into the grid through energy providers.The system gathers that heat, boosts it, and releases it indoors.
Sunlight (photons) hits the solar panel cells, which are made of special materials (semiconductors).
Different types of solar panels.
Solar PV (Photovoltaics). This is the technology that converts sunlight directly into electricity using photovoltaic cells. These cells are typically made from semiconductor materials, such as silicon, which absorb photons from sunlight and release electrons. This flow of electrons generates direct current (DC) electricity, which can be converted to alternating current (AC) using an inverter for use in homes. Solar PV systems can vary in scale from small residential rooftop installations to large solar farms. They are a key component of renewable energy strategies, helping to reduce reliance on fossil fuels and decrease greenhouse gas emissions.
Solar thermal. This is the technology that harnesses sunlight to produce heat, which can be used directly for heating our water, it can be used commercially to generate steam for industry, but we are looking at domestic systems here. Solar thermal technology is valued for its efficiency in directly using the sun’s energy for heating applications, contributing to lower energy bills and reduced reliance on conventional fuel sources. The panels used either have a dark absorbing surface made from polymers or evacuated tubes which look like fluorescent tubes. The evacuated tubes are more efficient in cold climates but can overheat if too hot.
For any renewable heating or solar project, whether funded privately or through a UK grant scheme, the current best practices, manufacturer’s instructions and relevant building regulations should be strictly adhered to. If installed on a UK grant scheme then a quality assurance program that certifies small-scale renewable energy systems and installers need to be followed, currently this is supplied by MCS.
It is also advised to use MCS installers to mitigate any problems with planning and safety compliance.
Other companies like the IAA offer microgeneration guarantees too. Most of the time when applying for renewable funding the installation company usually has the mechanism to set up the funding and this should be explained from the start.
You should NOT have to pay anything upfront or post install unless extras are quoted and agreed.
These extras could be, for instance, extra panels, battery connected inverter’s, batteries and possibly EV chargers. Get your installers to confirm the process of connecting to your grid supply, which is detailed below.
Currently, there are various funding streams, but are typically means tested. Have a look at the funding area of the site for more information.
To achieve effective solar panel installation in line with best practices, MCS standards, and building regulations, please review the following installation and operation guidelines.
DC LabelGround ArrayRoof Array
Pre-install.
Before connecting a solar power system, you must submit a DNO application to the relevant distribution network operator. This ensures they can assess and manage the required *electricity capacity. The documentation needed depends on the system’s size, larger systems generally require more paperwork before installation. For solar power systems, the standard threshold is 16 amps per phase, determined by the inverter’s AC output. If you’re unsure of the amp rating, consult the installation company’s electricians for guidance.
Labels/shut offInverter ErrorSchematic Diagram
*Electrical capacity, measured in amps (amperage), is the maximum amount of electricity a circuit can handle, so the DNO needs to make sure the generated power can be pushed back down the cables safely!
“phase” refers to the distribution of electrical load within a circuit, with “single phase” meaning there’s only one live wire supplying power to a household. Most UK homes are single phase.
Systems with an AC output under 16 amps per phase (less than 3.68kw) can be registered with a G98 form, usually allowing immediate installation. Systems exceeding 16 amps per phase (more than 3.68kw)are classified as large and require prior approval and a G99 form from the DNO before installation.
Informing your supplier.
If you’re trying to set up a Smart Export Guarantee with a supplier, they will require documentation like a DNO letter, they may also want a G98 or G99 approval and MCS certificate, They will require an export MPAN (they can usually request this from your DNO). Email your electricity supplier to inform them of the solar installation, give them the exact date of installation even if you have not received your MCS or other documentation. They will then confirm in return and hopefully guide you with the process.
What is an export MPAN? An export Meter Point Administrator Number (MPAN) is an industry reference for a unique 12 or 13-digit reference number to identify where electricity is fed into the grid. It helps to ensure exported electricity is measured accurately and payments/credits owed are assigned to the correct account. This can take your supplier many weeks to retrieve from your DNO. This number is different from your standard MPAN 21-digit number on your bill. We have a section in the blog to explain more. More details here.
Post-install.
All DC and AC solar cables and isolators Should be labelled throughout the installation. This is a MCS guideline, which we know is not a regulation, but any good installer should complete all the tasks mentioned. Ask the installers if your supplier is being informed. The installers may inform your supplier and pass on the necessary documentation but personally contact your energy supplier by email to confirm. PV cables under the panels. These should be secured, so the wiring is not touching the roof. This is to prevent failure, snagging and build up of debris. Safe lockable isolation at inverter. DC (black) and AC (red) Correct fixing of inverter. Manufactures will state surface mount requirements (fireproof etc). Clear diagrams of system to be placed near inverter (schematic diagram). This shows the setup of the system for maintenance and electrical circuits. Solar on roof label to be close to main fuse. This is mainly to inform emergency services that DC exists on the roof. Monitor meter. Should be installed in a location for ease of access and allow the occupier to be able to monitor the system to check for generation and faults (can be installed into consumer unit). The generation meter light should be blinking in the daylight, if not could be failure, check for warning on inverter. Some inverters are remotely monitored for failure, this should be explained and monitoring contact information left on site. Check that your meter is suitable for selling on excess energy. This usually has to be a smart meter and your energy supplier can guide you. Panel position. Solar panels should be installed to optimize daylight and eliminate shading, this is typically at a 35° angle facing south. Panels should not extend more than 200 mm from the roof surface and be minimum 400mm from the edge to prevent uplift, latest regulations, MCS guidance and manufacturer installation information should be followed. Flat roofs and pitched roofs have different installation techniques and parameters. Solar wizard, a good place to start to check orientation. Panel Type. Ask what configuration panels are. They could be in series or parallel. Protection. Panels may need to be protected from nesting birds or vermin. Labels. Cables should be labelled with DC warnings, and this should ideally be visible on each internal and external run. All meters and isolation switches should be labelled. Ground Panels. If panels are ground mounted, then cables to inverters should be safely and securely routed and labelled. Typically, in ground trenches at a minimum 500 mm. Ground mounted panels should be secured to prevent wind lift. Weighted and secured. Earth wires (bonding). Should be fitted to gas meters and water stopcocks. To prevent any electrical current moving to uninsulated pipework in case of failure or damage to the system. Planning permission. Typically, not required for domestic solar panel installations. However, planning permission may be required for listed buildings and conservation areas. If using an MCS registered installer, this should be verified for you.
Generation MeterGeneration MeterEarth Bonding
Series or Parallel.
Series connection.
Increases voltage, but keeps amperage the same
Suitable for high-voltage applications
Optimal output at the beginning and end of the day
Easier to work on, and requires less expensive wire
Sensitive to shading
A disruption in a series connection affects the entire system
Parallel connection.
Increases amperage, but keeps voltage the same
Suitable for systems with high current requirements
Better shading tolerance
Panels continue to work independently of each other
May require larger cables and additional equipment
May increase upfront costs for materials and installation
Micro InverterHybrid InverterInverter
Batteries.
Solar batteries store the extra electricity generated by solar panels, much like how car batteries hold the charge produced by alternators. These batteries allow homeowners to keep surplus energy for later use, increasing energy independence and reliability. They can power household appliances and charge electric vehicles, providing a convenient and sustainable energy solution. Batteries come in different sizes and make-ups. The most popular are lithium-ion, which uses lithium mined from countries like Argentina and Brazil. These batteries have a longer lifespan, store more power in a smaller space and are very efficient.
Tesla PowerwallEddi Power DiverterBattery and Inverter
Lead-acid batteries can be used, but due to size and poor efficiency, we don’t really see them now on UK systems. A new kid on the block is the saltwater batteries, which are an eco-friendly option but have lower power density compared to chemical batteries.
Benefits. When your solar panels produce more electricity than your home or building needs, the excess energy flows into the solar battery instead of being sent back to the grid. This stored energy can be drawn upon when the panels aren’t generating enough power. While the initial cost of solar batteries can be high, they can offer long-term savings by reducing the need to buy electricity from the grid, making them a worthwhile investment if within budget.
Solar battery systems are usually paired with hybrid inverters, which manage the flow of energy between the solar panels, batteries, and the grid. While initially more costly, they offer significant long-term savings and resilience, particularly valuable in areas prone to outages or with fluctuating energy cost.
Under the new P63100 standard regarding battery location, the basic premise is that the best place for storage batteries is outside the dwellings and away from habitable rooms. Where it is not practicable to locate batteries outdoors, some basic requirements are provided in P63100. Batteries shall not be installed in any of the following locations:
rooms in which persons are intended to sleep
routes used as a means of escape that are not defined as protected escape routes including landings, staircases, and corridors
corridors, shafts, stairs, or lobbies or protected escape routes
firefighting lobbies or staircases
storage cupboards, enclosures, or spaces opening into rooms which persons are intended to sleep;
outdoors within 1m of escape routes, doors, windows, or ventilation ports
voids, roof spaces or lofts
within 2m of stored flammable materials and fuel storage tanks or cylinders; and
cellars or basements that have no access to the outside of the building
Any battery storage in a place that is visited infrequently, then a fire alarm shall be installed to satisfy current regulations or standards.
Power diverters.
A power diverter is a device used in solar energy systems to redirect surplus electricity generated by solar panels to power specific appliances in your home, rather than sending it back to the grid. This allows you use of the solar power you generate by directing it to energy-intensive devices.
How it works. When your solar panels produce more electricity than your home is currently using, the power diverter detects this excess energy and automatically redirects it to a designated appliance (most commonly an immersion heater for hot water).
This prevents surplus energy from being exported to the grid, where compensation rates can be lower than the cost of grid electricity. Power diverters are usually affordable and easy to install compared to batteries, making them a popular choice for homeowners who want to improve their solar energy efficiency without a large upfront investment like batteries.
Heat is collected from outside (air, ground, or water).
That heat is compressed to raise its temperature.
The warmed heat is delivered to radiators, underfloor heating, blower units, or hot water.
The cycle repeats, quietly and continuously.
Electrical certificates.
The two types of electrical certificates you will come across as a customer who is having any electrical work as part of installing EEM’s (energy efficient measures)
Electrical Installation.
Minor Works Certificate.
Electrical Installation Certificate.
An electrical installation certificate is the type of certificate a customer receives after an electrician has installed one or more new circuits. Other examples include a complete rewire, a replacement consumer unit or an additional consumer unit. Generally, any time electrical work is done at the consumer unit, a new installation certificate will be issued.
Minor Works Certificate.
A minor works certificate is issued after an electrician has made an alteration to an existing circuit. Minor works certificates are often used to certify work such as adding additional sockets to an existing circuit or increasing the number of light fittings in a room. It can also be where a fused spur has been installed for an appliance or boiler connection.
You may need specialist advice from tradespeople and professionals regarding things like, Nesting. Bees, wasps, bats. Vermin. Rats, mice, squirrels Asbestos. Flues, guttering, facia boards etc. If squirrels, rats, or pigeons etc have the potential to nest or shelter under panels then protection will be required. Not only can they damage the panels, but they also tend to gnaw and pull on cables.
Some older houses may contain asbestos, which only a trained eye can recognise. Never disturb anything you’re unsure about. The health and safety section has more details.
Your property will have ladders and possibly scaffolding during installation of solar panels so it’s crucial for safety guidelines to be in place, warning signs, pavement ramps etc. Contractors should always explain the dangers and inform you of any changes. If you have close neighbours, then permissions may be needed for access and also approval for works in regard to noise and nuisance during installation (always polite anyway). Gas appliances and ventilation requirements should be carefully considered during the work, especially vertical flues and tile vents for loft ventilation.
Store or use, the supplier will pay less for the power return.
Having solar panels on our properties allows us to generate electricity when the British weather cooperates, of course! How we use that electricity depends on our needs and what we can afford to optimize. While batteries are an excellent way to store and use solar energy efficiently, they can be expensive, making them inaccessible to many.
For those without battery storage, making the most of solar energy means using appliances at the right time or selling excess electricity back to the grid. For example, if we generate 1.6 kW per hour on a sunny day and run a 1.4 kW washing machine, we get a free wash, avoiding the import cost of around 34p per kWh. If we don’t use the energy and instead sell it back via the Smart Export Guarantee (SEG), we might only receive 15p per kWh. That means using our own power saves us 19p per kWh. Since it’s not always feasible to perfectly match generation and usage, finding the right balance between importing and exporting electricity is key to maximizing savings and efficiency.
For someone used to a simple dial thermostat, navigating icons, settings, and scheduling interfaces can feel unnecessarily complex.
Controls for modern heating systems are often designed with flexibility in mind—but that flexibility can come at the cost of usability, particularly for older homeowners. Many systems now rely on layered menus, small touchscreens, or app-based controls that assume a level of digital confidence that not everyone has. For someone used to a simple dial thermostat, navigating icons, settings, and scheduling interfaces can feel unnecessarily complex. Even basic adjustments like increasing the temperature can become frustrating if they’re buried behind multiple steps.
There’s also a strong reliance on smartphones and apps, which doesn’t always reflect reality. A significant number of older people either don’t use smartphones at all or use them in a very limited way. Small screen sizes, poor contrast, and fiddly controls can make apps difficult to read and operate—especially for those with reduced eyesight or dexterity. On top of that, concepts like Wi-Fi connectivity, accounts, and software updates can create barriers that simply don’t exist with traditional controls. When heating becomes dependent on an app, it can leave some users feeling locked out of their own system.
Technology awareness plays a big role too. Many modern interfaces assume familiarity with common digital behaviours, swiping, tapping icons, navigating menus, but these aren’t universal skills. For older users, there can be a lack of confidence in “trying things,” especially when there’s a fear of pressing the wrong button and causing a problem. This often leads to systems being left on default settings, or worse, used incorrectly, impacting both comfort and efficiency.
Always ask installers what controls will be fitted. Ask for a easy to manage and NON app connected if technology will cause a problem. Don’t settle for “thats the only one we can fit!”
So what’s available? Encouragingly, there are still more accessible options. Some manufacturers offer simplified thermostats with large buttons, clear displays, and minimal menus, focusing only on core functions like temperature up/down and on/off. Others provide wired controls that stay in a fixed location, avoiding the need for apps altogether. There are also programmable thermostats with physical buttons and high-contrast screens, designed specifically with readability in mind. In more advanced systems, it’s sometimes possible to pair a smart setup with a basic user interface for day-to-day use, leaving the more complex controls to installers or family members if needed.
Ultimately, good design should work for the person using it, not the other way around. When specifying heating controls, it’s just as important to consider usability as it is efficiency. A system that’s easy to understand and operate will always perform better in real life than one packed with features that never get used.
Fabric First Approach, What It Is and Why It Matters!
The fabric first approach is built on a simple principle: reduce heat loss from the building before upgrading heating systems or adding renewables.
“Fabric” is just another term for walls, roof, floors and windows.
Instead of installing a high-tech heating system in a leaky home, fabric first aims to fix the building first, then optimise how it’s heated.
Why Fabric First Became the Gold Standard.
For years, fabric first has been the backbone of UK retrofit policy (including PAS 2035), and for good reason.
1. It Reduces Energy Demand at Source.
By improving insulation and airtightness, the home simply needs less heat to stay comfortable.
Lower energy bills.
Less reliance on heating systems.
Reduced carbon emissions.
This is fundamental—you can’t efficiently heat a home that constantly loses heat.
2. It Improves Comfort and Health
Fabric improvements don’t just save energy, they change how a home feels.
Warmer surfaces (no cold walls).
Fewer draughts.
Reduced risk of damp and mould.
More stable indoor temperatures.
These benefits are well documented, including improved physical and mental wellbeing.
3. It Futureproofs the Home.
A well-insulated building works better with any heating system.
Heat pumps perform more efficiently.
Smaller systems can be used.
Lower running costs long-term.
In other words, fabric first makes every future upgrade more effective.
4. It Supports a “Whole House” Approach
Fabric first encourages thinking about the home as a system:
Insulation.
Airtightness.
Ventilation.
Heating.
All designed together, not as bolt-on measures.
So Why Is It No Longer the “Only” Answer?
Despite its benefits, fabric first is no longer seen as the universal gold standard, especially when viewed through the lens of net zero.
This shift is strongly influenced by research such as the “Every Home Counts” review (which highlighted quality, whole-house thinking, and unintended consequences) and more recent academic work like “Fabric first: is it still the right approach?”.
The Key Challenges.
1. Net Zero Has Changed the Priority.
Fabric first was developed when all heating was fossil fuel-based.
Today, we can decarbonise heat directly using technologies like heat pumps.
Research shows that:
In some homes, switching to low-carbon heating alone can achieve major carbon reductions.
Fabric upgrades, while beneficial, are not always essential for decarbonisation.
2. Time and Scale Constraints.
Deep fabric retrofit (e.g. solid wall insulation, floors, airtightness upgrades):
Is expensive.
Is disruptive.
Requires skilled labour.
At current rates, rolling this out across all UK homes would take decades.
This creates a real issue: If you wait for “perfect fabric,” you may delay urgent carbon reduction.
3. Diminishing Returns.
Many homes have already had:
Loft insulation.
Cavity wall insulation.
What’s left is:
Harder.
More expensive.
More invasive.
The cost-benefit balance becomes less attractive at scale.
