Six routes to cutting the upfront cost of a UK solar install in 2026 — and the ones that look like grants but aren't.
Until 31 March 2027, residential solar PV (and batteries fitted at the same time, or retrofitted from Feb 2024) is zero-rated for VAT. Your installer applies it directly — there's no application. On a £7,000 install that's a £1,400 saving versus the pre-2022 standard rate.
ECO4 is a supplier-funded scheme delivering free or heavily subsidised energy upgrades, including solar PV in some cases, to households on qualifying benefits or in EPC band D–G. It's not a cash grant — your installer claims the value from an obligated energy supplier.
Eligibility hinges on receiving Universal Credit, Pension Credit, Income Support, or being referred via a council 'flexible eligibility' route (LA Flex). The scheme runs to March 2026, with ECO5 expected to follow.
Up to £6,000 interest-free for solar PV, plus up to £6,000 more for battery storage, repayable over 12 years. Scottish residents only, owner-occupier or private landlord. Combine with the cashback grant (up to £1,250 on solar) for households on qualifying benefits.
Free home energy improvements — including solar PV in qualifying cases — for low-income Welsh households, delivered by the Welsh Government via British Gas. Applies in EPC bands E–G; income or benefits criteria apply.
SEG isn't a grant; it's a legal obligation on large suppliers to pay you for surplus electricity exported to the grid. Best 2026 rates run 12–15p/kWh on smart-tariff variants. Applying takes 10 minutes once your install is MCS-certified.
Be careful with: 'free solar' rent-a-roof deals (you don't own the panels, they can complicate resale), 0% interest finance (still a loan, often hides product markup), and council 'solar together' bulk-buy schemes (good prices, but the discount comes from volume, not subsidy).