Can You Get Solar Panels Through ECO4?

The practical effect is that "free solar panels ECO4" describes a real but restricted route. ECO4 is a UK Government scheme offering free renewable energy installations, such as heat pumps and solar PV, to low-income and poorly-insulated homes². Obligated energy suppliers are required to reduce heating costs for low income and vulnerable households by funding energy efficiency, insulation and heating measures³. Solar PV is one of those measures, but it is not a standalone offer.

For a household that does qualify, the value is significant: paying for a comparable system yourself would cost £5,000 to £7,000 for a 4kW system without battery, or £6,000 to £8,000 for a 6kW system⁴. The sections below set out what ECO4 actually funds, who qualifies, what a roof needs to support, and the permissions and registration that apply.

What ECO4 actually funds: solar PV, free, under strict conditions

ECO4 is a UK Government-backed scheme regulated by Ofgem, delivered through obligated energy suppliers⁸. Its purpose is to reduce heating costs for low income and vulnerable households by funding energy efficiency, insulation and heating measures³. Solar PV sits within that framework, but only as part of a broader package.

The scheme's own guidance was updated to add paragraphs regarding solar PV, confirming the measure's place in the scheme⁹. Local authority documentation lists solar PV panels among the measures ECO funding pays for¹⁰. Independent guidance confirms that ECO4 can fund insulation, heating and even solar panels¹¹.

The critical restriction is the pairing requirement. ECO4 was the first iteration of the scheme to include solar PV, but only if it was installed alongside an electric heating system¹. That means a household with a gas boiler seeking only solar panels will not be funded for them through ECO4. The solar installation is contingent on the heating measure.

Freestanding solar panels are subject to additional restrictions and are not covered by the standard domestic route¹². The scheme is designed around roof-mounted systems installed as part of a whole-house retrofit.

For a household's energy independence, this matters. ECO4-funded solar reduces reliance on purchased electricity, but it does not remove dependence on the grid: the home still draws power at night and in winter, and the system is typically installed without battery storage under the scheme. The household remains connected to a supplier for whatever the panels do not generate.

The conditions: electric heating and lower heating costs

The pairing of solar PV with electric heating is not incidental. It reflects the scheme's core purpose: reducing heating costs for low income and vulnerable households³. Electric heating systems, particularly heat pumps, run on electricity, and pairing them with solar generation offsets some of that running cost.

ECO4 funding covers energy efficiency measures such as heating improvements and insulation¹³. Local authority guidance sets out the kinds of heating work supported: installing central heating where there is no boiler or radiators, replacing storage heaters or coal fires with gas central heating, replacing a non-condensing combi boiler with a modern combi boiler, and replacing a heat only boiler with a modern combi boiler¹⁴. Solar PV is added where the heating measure makes it appropriate.

Homes with an EPC of D or below could receive heavily discounted or free home insulation, green heating systems or an upgraded boiler¹⁵. The EPC condition is central: the scheme targets the least efficient homes, where the combined effect of insulation, heating upgrade and solar generation produces the greatest reduction in running costs.

The financial logic for the household is straightforward. Sunlight is free, so once the initial installation is paid for, electricity costs are lower¹⁶. Under ECO4, the household does not pay for the installation at all, provided it qualifies. What remains is the standing charge and the cost of grid electricity drawn outside generation hours.

Who qualifies: benefits, eligibility and how the scheme works

ECO4 eligibility rests on two pillars: the household's benefits status and the property's energy performance. Both must be satisfied.

On benefits, the qualifying list includes Child Benefit, Pension Guarantee Credit, Income-related ESA, Income-based JSA, Income Support, Universal Credit, Housing Benefit and Pension Credit Savings Credit¹⁷. Child Benefit is a qualifying benefit under the Affordable Warmth route¹⁸. Housing Benefit appears on the list, so a household in receipt of it may qualify, but it is one of several routes rather than a requirement¹⁹.

On the property, the household must live in a home with an EPC rating D or lower, and if renting, have the landlord's permission¹⁷. Independent guidance confirms the EPC range as D to G for homeowners or private tenants claiming a listed benefit²⁰. Applications are made through specific energy suppliers, and a household can apply through one of those suppliers even if it is not a customer of theirs²⁰.

There is a separate route through ECO4 Flex, where local authorities use flexible eligibility to widen access beyond the standard benefit list. Under Flex, the approved provider or agent is required to collect and submit evidence of income and other relevant details to the council for eligibility assessment³. Installations of most energy efficiency measures under ECO4 Flex must be carried out by TrustMark-registered businesses adhering to PAS standards³.

Not every household fits. Research on consumer segments found that among higher-earning Gen X households, 0% of that segment was eligible for ECO4²¹. The scheme is tightly targeted, and the presence of solar PV within it does not widen the eligibility net.

If a household qualifies and is happy with the proposed improvements, the supplier will book the installation at a convenient time².

What a free system would replace: the £5,000 to £11,000 cost of paying yourself

For a household that does not qualify for ECO4, or that wants solar without the heating pairing, the cost falls to the homeowner. Independent pricing puts a 4kW system at £5,000 to £7,000 without battery, suited to a three to four person household, and a 6kW system at £6,000 to £8,000 without battery, suited to large families or those with electric vehicles charged at home⁴. Those figures are the average system cost and exclude battery storage.

Ongoing costs are modest but not zero. Cleaning costs range from around £4 to £15 per panel and depend on how easy they are to access and how dirty they become²². For a 10-panel array, that is a recurring maintenance consideration.

The comparison with ECO4 is stark. A qualifying household receives the installation at no cost as part of a funded package; a non-qualifying household pays the full system price. The scheme therefore functions as a targeted subsidy rather than a universal grant, and the "free solar panels" framing obscures that distinction.

For energy independence, a self-funded system delivers the same physical benefit as a funded one: reduced electricity purchases and lower exposure to price rises. The difference is who bears the capital cost. ECO4 shifts that cost to obligated suppliers; self-funding leaves it with the household.

Is your roof suitable? Orientation, shading and condition

Roof suitability determines whether solar PV is worth installing at all, whether funded or self-funded. The good news is that solar panels are suitable across the UK²³. Output varies with latitude and weather, but the technology works nationwide.

Orientation matters. Solar PV panels are worth considering if there is a south, east or west-facing roof with little or no shade, and the household is not thinking of moving in the near future⁶. A south-facing roof captures the most generation across the day; east and west roofs produce less but spread output across morning and evening.

Shading is a limiting factor. If a roof is heavily shaded, solar panels may not be the most suitable option²⁴. Shading from nearby buildings or trees reduces output, and the effect is disproportionate because shading on one panel can drag down the performance of the whole string.

Roof type is less of a barrier. Solar panels can be installed on both pitched and flat roofs; on a flat roof, the panels need to be tilted and spaced to avoid shading⁶. Flat roof installations use mounting frames to achieve the necessary angle.

The number of panels that can be installed may be limited by the roof shape, skylights, shading from nearby buildings or trees, local planning or conservation area requirements, local grid capacity and export limits²³. These constraints apply equally to ECO4-funded installations, since the physical roof does not change with the funding route.

Permission, registration and choosing an installer

Planning permission is generally not required for domestic solar panels. Permitted Development Rights apply, and installing solar panels is listed as an example of permitted development²⁵. The installation of solar panels will generally not need planning permission⁷. If the proposed solar panels meet the criteria and conditions of Permitted Development, no application is needed²⁶.

There are exceptions. Conservation areas, listed buildings and areas covered by an Article 4 Direction may require consent. Listed building consent is required for adding solar panels to the building or curtilage²⁷. Freestanding solar panels are subject to additional restrictions¹².

Building Regulations are a separate matter. If you wish to add a solar panel to the roof of your home, Building Regulations approval is likely to be needed²⁸. The same requirement is stated in Welsh guidance²⁹. This covers structural and electrical safety, and it applies regardless of whether the installation is funded by ECO4.

Grid registration is mandatory. You must register the system with UK Power Networks, usually done by your installer⁶. This ensures the distribution network operator knows about the generation connected to the local grid.

On installer standards, ECO4 providers, agents, installers and contractors should be TrustMark registered³⁰. Installations of most measures under ECO4 Flex must be carried out by TrustMark-registered businesses adhering to PAS standards³. Where gas boilers are involved, the installer should be Gas Safe registered¹⁰.