Top 10 Trusted Installers for Warm Homes Plan Upgrades in 2026
Finding a reliable Warm Homes Plan installer can make a real difference to the comfort, efficiency and long-term value of your property. With many UK companies offering insulation, heating, solar panels, batteries, ventilation and retrofit services in 2026, it helps to know which installers are worth considering before arranging a home assessment.
In this guide, we rank the top 10 trusted installers for Warm Homes Plan upgrades, highlight what each company is best suited for, and explain the key checks to make before choosing one. Whether you need grant-supported improvements or a whole-home retrofit project, this list will help you compare your options with more confidence.
Quick shortlist: trusted installers for Warm Homes Plan-style upgrades
The Warm Homes Plan supports upgrades such as solar panels, batteries, heat pumps and insulation, with targeted support for low-income households and wider routes for homeowners who want to improve home efficiency. GOV.UK says the plan includes £15 billion of public investment to upgrade up to 5 million homes and help more households reduce energy bills.
| Rank | Installer | Strongest fit | Website |
|---|---|---|---|
| 1 | E.ON Next / E.ON Energy | Grant-supported home efficiency upgrades | E.ON Next / E.ON Energy |
| 2 | Octopus Energy | Heat pumps, solar, batteries and smart tariffs | Visit Website |
| 3 | British Gas / Hive | Insulation, heating and national brand support | British Gas / Hive |
| 4 | Aira | Heat pump-led home energy systems | Visit Website |
| 5 | EDF Heat Pumps / CB Heating | Specialist heat pump installation | EDF Heat Pumps / CB Heating |
| 6 | Simple Green Energy | Heating, insulation, solar, ventilation and grant-led upgrades | Visit Website |
| 7 | OVO Solar & Heating | Solar, batteries and heat pump planning | Visit Website |
| 8 | Heatable | Fast online quotes for energy upgrades | Visit Website |
| 9 | Glow Green | Solar, batteries, heat pumps and boilers | Visit Website |
| 10 | Furbnow | Whole-home retrofit planning and vetted contractors | Visit Website |
Important note: Warm Homes support is not always delivered by a customer choosing any installer directly. The Warm Homes: Local Grant is delivered through local authorities in England, and councils or their delivery partners may manage surveys, eligibility checks and installations.
This list is an editorial shortlist of trusted companies to consider for Warm Homes Plan-style upgrades. It is not an official government-approved ranking.
1. E.ON Next / E.ON Energy
Best for: Grant-supported insulation, heating and low-carbon upgrades.
E.ON is one of the strongest choices for households looking at government-backed home efficiency support. Its grant and scheme pages cover funding routes for home energy improvements, including insulation, solar panels, air source heat pumps and Warm Homes Local Grant support.
Warm Homes fit
E.ON is well suited to households that want a major energy supplier involved in the process, especially where grants, eligibility checks and multiple measures are part of the project.
Check before booking
Confirm which scheme is being used, whether the work is council-led, and whether any customer contribution or landlord permission applies.
2. Octopus Energy
Best for: Heat pumps, solar panels, batteries and smart tariff integration.
Octopus Energy is a strong option for homeowners planning a connected home energy setup. Its heat pump service includes postcode checks, an in-home survey and system design, while its wider smart home tech offer covers heat pumps, solar, battery storage and EV charging.
Warm Homes fit
Octopus works well for homeowners considering low-carbon heating alongside solar or battery storage, especially where smart tariffs could help manage running costs.
Check before booking
Make sure the proposed system suits your home’s heat loss, insulation level and electricity usage. A good heat pump quote should include proper design work, not just a product price.
3. British Gas / Hive
Best for: National support for insulation, heating and smart home upgrades.
British Gas offers home insulation services and says customers may be eligible for financial help through energy-efficiency funding schemes. Its insulation services include cavity wall insulation and other home efficiency support.
British Gas also provides guidance on air source heat pump grants and low-carbon heating support across the UK.
Warm Homes fit
British Gas is a practical option for customers who want a familiar national brand and are comparing heating, insulation and wider home energy improvements.
Check before booking
Check whether British Gas is currently accepting applications for the specific scheme you want, as some grant routes open and close depending on deadlines and delivery capacity.
4. Aira
Best for: Heat pump-first home energy upgrades.
Aira focuses on low-carbon heating and connected home energy systems. Its home energy system combines an air source heat pump, solar panels and home battery storage, supported by smart controls.
Warm Homes fit
Aira is best suited to homeowners who already know they want to move towards heat pump heating and may later add solar or battery storage.
Check before booking
Ask how the heat pump will perform in your specific home, what radiator or pipework changes are needed, and whether insulation improvements should come first.
5. EDF
Best for: Specialist heat pump installation.
EDF acquired CB Heating to strengthen its heat pump installation offer, with the aim of supporting customers moving to zero-carbon heating solutions.
CB Heating has a long background in heat pump installation and is suited to households focused mainly on replacing fossil-fuel heating with an air source heat pump.
Warm Homes fit
This is a strong option where the main upgrade is low-carbon heating rather than a wider package of insulation, solar and batteries.
Check before booking
Confirm the installer’s MCS certification, consumer protection cover and whether the proposed heat pump design includes heat-loss calculations.
6. Simple Green Energy
Best for: Heating, insulation, solar, ventilation and grant-led home upgrades.
Simple Green Energy is a strong option for households that want practical home energy upgrades under one roof. The company describes its work across England and Wales as helping homes reduce energy costs with renewable heating, solar, insulation and ventilation solutions.
Its service range also includes solar panels, air source heat pumps, EV chargers, battery storage, boilers, loft insulation, cavity wall insulation and ventilation solutions.
Warm Homes fit
Simple Green Energy is a good fit for survey-led upgrades where the home may need more than one improvement, such as insulation before heating upgrades, solar with batteries, or ventilation alongside fabric improvements.
Check before booking
Ask which measures are recommended first, whether the installer is working under a grant route or private installation route, and which accreditations apply to each measure.
7. OVO Solar & Heating
Best for: Solar, batteries and heat pump planning.
OVO Solar & Heating offers solar and heating installations, including solar panels, battery storage and heat pumps. Its website says a local expert can assess the home and provide a tailored quote.
OVO also explains that solar panels and batteries can help power a heat pump by storing unused solar electricity for later use.
Warm Homes fit
OVO is a good option for homeowners considering the order of upgrades: solar first, battery first, heat pump first, or a combined approach.
Check before booking
Ask for a clear savings estimate based on your actual energy use, roof suitability and heating demand.
8. Heatable
Best for: Fast digital quotes for boilers, solar and batteries.
Heatable is an online home installation platform covering boilers, solar panels and batteries. It describes itself as a Which? accredited installer platform focused on faster, better-value home installations.
Warm Homes fit
Heatable is useful for homeowners who want quick comparisons and a simple online process before committing to an upgrade.
Check before booking
Make sure the quote includes the full installation scope, warranty, scaffolding, electrical work and post-installation paperwork.
9. Glow Green
Best for: Solar, batteries, heat pumps, boilers and multi-product upgrades.
Glow Green offers heat pumps and says it is MCS certified, with qualified and accredited engineers carrying out work.
The company also offers wider home energy products, including solar panels, batteries, boilers, air conditioning and EV chargers. The attached reference blog used a similar comparison approach, looking at installer reputation, reviews, experience, accreditations and service quality when ranking installers.
Warm Homes fit
Glow Green is a good fit for customers who want to compare several upgrade types from one provider, especially solar, batteries and heating systems.
Check before booking
Compare the product specification carefully and check whether each measure is covered by the right accreditation and warranty.
10. Furbnow
Best for: Whole-home retrofit planning and vetted contractor routes.
Furbnow is different from a standard installer. It focuses on home energy planning, design and contractor coordination. Its website says it provides a BuildPack with phased instructions for what should be installed, where and when, and can provide quotes from vetted contractors in its supply chain.
Warm Homes fit
Furbnow is useful for homeowners who want a proper retrofit plan before choosing installers, especially for older homes, complex projects or staged upgrades.
Check before booking
Ask whether you are paying for advice, installation, contractor coordination or all three. This can help avoid confusion before work starts.
Best installer by Warm Homes upgrade type
| Upgrade need | Best-fit installers |
|---|---|
| Grant-supported home efficiency work | E.ON Next, Simple Green Energy, British Gas |
| Heat pumps | Octopus Energy, Aira, EDF Heat Pumps, Simple Green Energy |
| Solar panels | Octopus Energy, E.ON, OVO Solar & Heating, Glow Green |
| Battery storage | Octopus Energy, OVO, Glow Green, Heatable |
| Insulation | E.ON, British Gas, Simple Green Energy |
| Whole-home retrofit planning | Furbnow, Simple Green Energy, E.ON |
| Fast online quote | Heatable, Octopus Energy, OVO |
How to choose the right Warm Homes Plan installer
1. Start with the official route first
If you are applying through the Warm Homes: Local Grant, start with GOV.UK or your local authority. The scheme is delivered through councils in England and applies to low-income households in privately owned homes with EPC ratings from D to G.
2. Check TrustMark, MCS and PAS standards
For government-backed retrofit work, installer standards matter. GOV.UK states that, for retrofit work under government schemes, installers should be MCS certified or TrustMark accredited, and work should meet MCS standards or PAS 2030/2035 where required.
Warm Homes Local Grant policy guidance also says installers must be TrustMark registered and certified under the latest PAS 2030 or MCS requirements for relevant eligible measures.
3. Match the installer to the measure
Do not choose a solar company for an insulation-led project just because they rank highly. A good installer for Warm Homes-style upgrades should match the main measure your home needs.
| If your home needs... | Look for... |
|---|---|
| Insulation | TrustMark / PAS retrofit experience |
| Heat pump | MCS heat pump certification and heat-loss calculations |
| Solar panels | MCS solar certification and roof survey |
| Battery storage | Electrical competence, battery warranty and system compatibility |
| Multiple upgrades | Retrofit coordination and clear sequencing |
4. Ask for the upgrade sequence
The order matters. In many homes, insulation and ventilation should be considered before heating upgrades. Solar and battery storage may work better once electricity use and heating plans are clear.
Ask the installer:
- What should be done first?
- What can wait?
- What affects the EPC rating most?
- What could reduce bills fastest?
- What could cause damp or ventilation problems if done badly?
5. Compare more than one quote
A trusted installer should be comfortable with you comparing quotes. Look beyond the headline price and check product models, warranties, survey detail, scaffolding, electrical work, aftercare and paperwork.
6. Avoid vague grant promises
Be careful with any company that guarantees funding before checking your property, income, EPC rating and local scheme availability. Warm Homes support depends on the scheme route, council delivery, property suitability and funding availability.
7. Get everything in writing
Before agreeing to work, make sure you have:
| Document | Why it matters |
|---|---|
| Written quote | Confirms price, contribution and scope |
| Survey report | Shows why measures were recommended |
| Product specification | Confirms exact models and performance |
| Accreditation details | Helps verify installer standards |
| Warranty information | Protects you after installation |
| Grant or funding explanation | Shows who pays, what is covered and what is not |
| Completion documents | Needed for future claims, warranties and property records |
Frequently asked questions (FAQs)
Simple answers to common questions about trusted installers for Warm Homes Plan upgrades, including grant delivery, local authority routes, insulation, heat pumps, solar panels, batteries and retrofit accreditations. Speak to Simple Green Energy.
Need help choosing a Warm Homes installer?
Speak with Simple Green Energy about Warm Homes-style upgrades, grant-supported retrofit work, insulation, heating improvements and wider home energy-efficiency measures.
Get Warm Homes adviceFinal takeaway
The best installer for Warm Homes Plan upgrades is not always the biggest company. It is the one that understands your home, checks eligibility properly, recommends the right measures in the right order and can prove the standards behind the work.
For grant-supported home efficiency upgrades, E.ON Next is a strong first choice. For smart heat pump, solar and battery upgrades, Octopus Energy stands out. For heating, insulation, solar, ventilation and grant-led home improvements, Simple Green Energy earns the number three position.
Before booking, check the official scheme route, ask for accreditation proof, compare quotes and make sure the installer is designing the upgrade around your property — not just selling a product.
