ECO4 Grant Deadline 2026: Three Deadlines That Change the Maths on Solar

There is a lot of "free solar panels" clickbait about. Let's cut through it. Three government deadlines are approaching in the next 18 months that affect what solar actually costs you. If you qualify for any of them, the difference between acting now and waiting is thousands of pounds. If you do not qualify, the honest answer is: you pay full price, same as a new boiler or a kitchen extension.

Here are the three deadlines, who they apply to, and what to do about each one.

Deadline 1: ECO4 - 31 December 2026

This is the big one. ECO4 is the fourth wave of the Energy Company Obligation scheme, and it is the main route to fully-funded solar for low-income households. The government confirmed in January 2026 that it would extend the scheme through to 31 December 2026. After that date, no new applications.

Managed by Ofgem, ECO4 forces larger energy suppliers to pay for energy-efficiency improvements in the UK's most energy-poor homes. Solar panels are one of the measures it covers, alongside insulation, heating upgrades, and double glazing. As of April 2026, just under 7% of ECO4's 950,000-plus installed measures were solar PV - so while it is not the biggest part of the scheme, it is real and it is funding installations right now.

Who qualifies for ECO4

Qualifying benefits include:

• Universal Credit
• Housing Benefit
• Pension Credit (Guarantee or Savings Credit)
• Income Support, income-based JSA, or income-related ESA
• Child Benefit (with an income threshold cap)
• Working Tax Credit or Child Tax Credit
• Disability Living Allowance or Personal Independence Payments

Your property needs an EPC rating of E, F, or G - the scheme is explicitly designed for the least efficient homes. If your home is rated D or above, you are out of scope for ECO4.

LA Flex: There is an extension called Local Authority Flexible Eligibility that lets councils fund households who need the help but do not receive benefits. If your income is low and your home is inefficient, it is worth asking your council even if you are not on benefits - LA Flex exists precisely for this scenario.

ECO4 is available in England, Scotland, and Wales. It is not available in Northern Ireland. If you rent, you can still apply with your landlord's permission.

How to apply

Apply directly through your energy supplier - Octopus, E.ON, EDF, British Gas, OVO, and Scottish Power all participate. A surveyor will assess your property and confirm eligibility. The installer is paid directly by the energy company, so there is no upfront cost to you. The whole process can take as little as two weeks from application to installation.

Deadline 2: 0% VAT on Solar - 31 March 2027

This one applies to everyone, not just low-income households. The UK government zero-rated VAT on solar panels, batteries, and other energy-saving materials from April 2022. That rate is scheduled to expire on 31 March 2027.

What it means in real money: a typical 4.5kW solar system costs about £7,300 without a battery. At standard 20% VAT, you would pay £8,760. The 0% rate saves you roughly £1,460. On a larger system with a battery (£10,000+), the saving is £2,000 or more.

There is a catch: the 0% rate applies to supply-and-install contracts with a VAT-registered installer. If you buy panels yourself from a retailer and fit them, you pay standard-rated VAT on the hardware. Pure DIY buyers do not get the VAT break on materials. The workaround is to buy the kit and have a VAT-registered electrician do the install - the zero rate can then apply to the installation labour.

Combined with the energy price cap sitting at £1,862 and electricity at 26.11p/kWh, the maths on solar is the best it has been in years. 0% VAT plus high electricity prices plus SEG export payments at 11-16p/kWh means a typical 4kW system pays back in 6-8 years. Once the VAT holiday ends in March 2027, that payback stretches out by about a year. Not a dealbreaker, but it is real money.

Deadline 3: Warm Homes Local Grant - Until 2029

Launched in April 2025 as part of the government's £15 billion Warm Homes Plan, this grant targets households that fall between the cracks: too well-off for ECO4 but still struggling with energy costs.

Eligible households can get up to £15,000 for energy-efficiency improvements including solar panels, plus a separate £15,000 for low-carbon heating like heat pumps. It is administered by local authorities, not energy suppliers, so the process is different from ECO4.

Who qualifies

• Household income under £36,000
• EPC rating of D, E, F, or G
• Homeowner or tenant (with landlord permission)
• England only (Scotland and Wales have their own schemes)

You can check eligibility through the government's free online checker. Local authorities have some flexibility to adapt the criteria to their area's needs, so applying even if you do not tick every box is worth a go.

The grant also includes a Warm Homes Fund - low and 0% interest loans for homeowners regardless of income, covering solar panels, batteries, heat pumps, and insulation. The government has not yet announced when these loans launch; details are expected later in 2026.

Other schemes worth knowing about

Beyond the three main deadlines, there are a handful of other programmes that can reduce the cost of solar:

The honest answer about "free solar panels"

Every few years a new wave of "free solar panels UK" adverts appears. Here is the reality in 2026:

• If you are on benefits with an inefficient home - ECO4 can genuinely cover 100% of the cost. It is real, it is government-backed, and thousands of households have used it.
• If your income is under £36,000 and your home rates D-G - the Warm Homes Local Grant can cover most or all of a solar installation.
• If you are a homeowner who does not qualify for either - you pay for the system yourself. The 0% VAT rate helps (until March 2027), SEG export payments help, and the payback is good at current electricity prices. But there is no universal free-solar scheme, and anyone promising you one is either selling something or does not understand the schemes themselves.

For a full rundown of every grant, scheme, and incentive available, see our UK solar grants guide.