ECO4 Solar PV vs the Warm Homes: Local Grant: Which Is Better in 2026?
ECO4 and the Warm Homes: Local Grant can both support solar panels, but they work very differently. ECO4 is an energy-supplier obligation covering Great Britain. The Warm Homes: Local Grant is an England-only programme delivered through participating local authorities.
For an eligible household in England whose main goal is solar PV, the Warm Homes: Local Grant is usually the more flexible route. ECO4 solar is narrower because the electricity generated must help reduce heating costs through an eligible electric heating system.
This guide compares eligibility, funding, measures, timescales and the checks to make before accepting an installation.
Check your ECO4 eligibility
Answer a few quick questions to see whether your household may qualify for ECO4 support.
Quick answer
The Warm Homes: Local Grant is generally best for eligible English households because solar PV can be included as an energy-performance measure, potentially alongside insulation, controls or a battery. Homes normally need an EPC of D–G, while households must qualify through income, benefits or an eligible postcode. ECO4 is available across England, Scotland and Wales, but solar is only eligible where it reduces costs for qualifying electric heating, such as a heat pump or high-heat-retention storage heaters. Neither scheme guarantees panels: the final package depends on eligibility, the property survey, technical suitability, available funding and the delivery body’s decision.
ECO4 vs Warm Homes: Local Granteating combinations at a glance
| Feature | ECO4 solar PV | Warm Homes: Local Grant |
|---|---|---|
| Delivery | Energy suppliers and delivery partners | Local authorities or regional consortia |
| Coverage | Great Britain | England only |
| End date | 31 December 2026 | 31 March 2028 |
| Property focus | Inefficient homes occupied by eligible low-income or vulnerable households | Privately owned EPC D–G homes occupied by eligible low-income households |
| Solar rule | Must reduce heating costs through eligible electric heating | Solar can be chosen as an energy-performance measure |
| Typical package | Insulation, heating and solar where the rules are met | Insulation, solar, controls, battery and/or low-carbon heat |
| Funding | No fixed household grant; offers vary | Approved owner-occupier works are fully funded |
| Best for | Qualifying electrically heated homes | Eligible English homes with a suitable roof |
ECO4 has been extended to 31 December 2026. It places a legal obligation on larger energy suppliers and is not a conventional household grant, so meeting the eligibility rules does not create an automatic entitlement. The Warm Homes: Local Grant opened in April 2025, has £500 million allocated nationally and is scheduled to run until March 2028.
How ECO4 solar PV works
ECO4 aims to reduce home-heating costs for low-income, fuel-poor and vulnerable households. A household may qualify through specified benefits or ECO4 Flex, which lets participating councils and devolved administrations refer certain private-tenure households that are low income or vulnerable to cold.
Solar PV is treated as a heating measure rather than a general electricity-saving extra. Ofgem says the home must have, or receive as part of the project, a hydronic heat pump, high-heat-retention electric storage heater or another qualifying responsive electric heating system. Some solar electricity must be used by equipment that provides heat in the home. ECO4 solar should not be installed where a non-electric primary heat source is planned.
Pros
ECO4 can create a whole-home package covering insulation, eligible heating and solar. It is also available in Scotland and Wales, where the Warm Homes: Local Grant does not operate.
Things to consider
The electric-heating restriction excludes homes that will continue to use gas, oil or LPG as their primary heating source. Insulation preconditions and minimum EPC improvements may also apply. What is offered depends on the property, supplier scoring and available obligation. ECO4 funding cannot be blended with another government scheme for the same measure.
Example: An EPC E bungalow with inefficient storage heaters may receive loft insulation, high-heat-retention storage heaters and solar PV as one compliant project.
Expert recommendation: View ECO4 solar as part of a heating-led retrofit, not as a universal free-solar offer.
How the Warm Homes: Local Grant works
The Warm Homes: Local Grant supports low-income households in privately owned homes in England. The property must normally be EPC D, E, F or G. Eligibility can be established through an eligible low-income postcode, specified means-tested benefits or ECO Flex criteria, or gross annual household income of £36,000 or less. An alternative after-housing-costs threshold may apply according to household composition.
A local retrofit assessment determines the package. Solar PV, insulation, glazing, controls and domestic batteries sit within the energy-performance category. Heat pumps and other eligible clean-heating systems use a separate low-carbon-heat category.
Pros
Unlike ECO4 solar, the Warm Homes policy does not restrict panels to homes with qualifying electric heating. All existing heating-fuel types may be considered, making this route more suitable for an eligible household with a gas boiler. Batteries can also be funded alongside new or existing solar where they are expected to improve bill savings and meet the applicable standards.
Approved owner-occupiers do not contribute. One eligible private-rented property per landlord can be fully funded across the scheme; the landlord must contribute 50% for further properties. Tenants are not expected to pay.
Things to consider
Eligibility does not guarantee solar. The retrofit coordinator may prioritise insulation or heating if those measures offer better value for the property. Funding and waiting times vary locally, and councils must have a fair process for managing demand where applications exceed delivery capacity.
Example: An EPC D semi-detached home meets the income test, uses gas heating and has a sound, lightly shaded roof. Solar and smart controls may be recommended because ECO4’s electric-heating condition does not apply.
Expert recommendation: Eligible English households should normally check the Warm Homes: Local Grant first when solar is the main objective.
Which scheme is best for you?
Choose the Warm Homes: Local Grant first when you:
- Live in England.
- Occupy a privately owned EPC D–G property.
- Meet an income, benefit or postcode pathway.
- Want solar considered regardless of your current heating fuel.
Check ECO4 first when you:
- Live in Scotland or Wales.
- May qualify through benefits or ECO4 Flex.
- Already use, or could receive, qualifying electric heating.
- Need deeper insulation and heating work before solar makes sense.
Landlords should note that Warm Homes gives one eligible private-rented property full funding before the 50% contribution rule begins. Under both schemes, landlord permission and a technical survey are required.
Cost and savings guide
| Cost or funding point | Practical position |
|---|---|
| Typical private 4.5kWp solar system | Around £7,600 before funding |
| ECO4 support | No universal per-home amount; depends on the package and supplier |
| Warm Homes energy-performance cap | £16,600 average per treated home across the local project |
| Warm Homes low-carbon-heat cap | Separate £16,600 project average when activated |
| Approved Warm Homes owner-occupier contribution | £0 |
| Export payments | May be available through a qualifying Smart Export Guarantee tariff |
The two £16,600 figures are project-level averages, not a promise that every applicant will receive £33,200. Local authorities must achieve the caps on average across their projects. ECO4 suppliers decide which measures to fund and may occasionally ask for a household contribution.
Energy Saving Trust estimates that an average 4.5kWp domestic solar system costs around £7,600 when purchased privately. Actual savings depend on system size, location, roof direction, shading, electricity consumption and export tariff. Panels work on cloudy days, although generation follows available daylight and is normally lower during winter.
Ask for an annual generation estimate, expected self-consumption, export assumptions, warranties and any ongoing costs. The Smart Export Guarantee allows qualifying small generators to receive payments for electricity exported to the grid.
How to choose and apply
- Confirm your location and deadline. Warm Homes is England-only; ECO4 covers Great Britain.
- Check the EPC. Warm Homes requires D–G. ECO4 starting-band rules vary by tenure and eligibility pathway.
- Gather evidence. Prepare income or benefit documents and check whether your postcode or council’s ECO4 Flex policy could help.
- Review the heating system. For ECO4 solar, obtain written confirmation that the existing or proposed electric heating meets Ofgem’s requirements.
- Survey the roof. Check its condition, orientation, shading, usable area, access and planning constraints.
- Assess the whole property. Insulation, ventilation, heating, controls, solar and battery storage should work as a coordinated system.
- Verify the provider. Apply through the official government service, council, obligated supplier or authorised delivery partner. Do not pay a lead generator simply to “release” government funding.
- Secure the paperwork. Obtain the design, generation estimate, warranties, electrical certificates, MCS certificate, handover information and complaints route.
The official Warm Homes application service states that the council will usually contact applicants within ten working days to request further details and arrange a survey. The time between assessment and installation will depend on local funding and delivery capacity.
Why the installer matters
Even a fully funded system can perform poorly if it is badly designed. Panel layout, inverter sizing, roof fixings, cable routes and grid connection affect safety, output and reliability.
Warm Homes installations must follow the scheme’s retrofit and quality standards, including the relevant PAS 2035, TrustMark and MCS requirements. ECO4 solar must be completed by an MCS-accredited or equivalent installer and installed to the relevant certification and retrofit standards.
Before signing, ask:
- Who owns the panels and inverter?
- Who is responsible for roof damage?
- How long are the workmanship and product warranties?
- Who provides repairs and aftercare?
- Is monitoring included?
- When will you receive the MCS and electrical certificates?
- Will the installer complete the grid-notification process?
- What happens if the predicted generation is not achieved?
Book a free home-energy survey: Simple Green Energy can explain solar suitability, likely generation and the practical questions to put to a grant provider.
Frequently asked questions (FAQs)
Clear answers about ECO4 solar eligibility, gas-heated homes, the Warm Homes: Local Grant, income and EPC rules, private tenants, landlord contributions and solar-battery funding. Speak to Simple Green Energy .
Could ECO4 or Warm Homes support your property?
Speak with Simple Green Energy about your heating system, household income, EPC rating, property tenure, landlord requirements and whether solar panels or battery storage may be suitable.
Check my solar-grant optionsConclusion:
For most eligible households in England, the Warm Homes: Local Grant is the stronger solar route because it accepts all heating fuels and can combine panels with insulation, controls, batteries or low-carbon heating.
ECO4 remains valuable across Great Britain, particularly for qualifying electrically heated homes needing a coordinated retrofit, but its solar rules are more restrictive.
Start with eligibility, then judge the proposed package on roof suitability, realistic generation, installation standards, warranties and aftercare. “Free” solar is only valuable when the system is right for the home.
