Solar Lease vs Buy UK: Is a Rent-a-Roof Deal Still Worth It?

Solar panels are no longer a luxury item — a 4 kWp system costs roughly £5,500–£8,500 fully installed in 2026, and the payback period for most UK homes lands between 8 and 12 years. But not everyone wants to find that cash upfront. Enter the solar lease (often called a rent-a-roof scheme or Power Purchase Agreement). Zero installation cost sounds attractive — so why do so many homeowners later regret signing one?

What is a solar lease or PPA?

A lease or PPA puts the panels on your roof at no upfront cost, but a third-party provider owns the system throughout the contract, typically 20–25 years. Under a lease you pay a fixed monthly fee; under a PPA you pay a per-unit rate for every kilowatt-hour the panels generate, usually well below the standard grid rate. The provider keeps all Smart Export Guarantee (SEG) export income and in most cases retains all tax benefits and any future incentive payments. You get cheaper electricity for the hours the sun shines, but you never own the asset.

Rent-a-roof schemes — where a provider installed panels free in exchange for keeping Feed-in Tariff payments — were common before the FiT closed to new applicants in April 2019. Some companies still operate similar models today under a PPA wrapper, though the market has shrunk considerably.

The hidden cost of a lease: what you give up

You lose all SEG income

Under a lease or PPA, the provider registers for the Smart Export Guarantee, not you. Depending on your tariff, SEG rates in 2026 run from around 1p/kWh up to 32p/kWh with the best variable export tariffs; a typical fixed rate is 12–16p/kWh. A 4 kWp system exporting a modest 800 kWh per year at 15p yields £120 annually — over a 25-year contract that is roughly £3,000 you will never see. See our guide to the best SEG export tariff rates for 2026 for the current league table.

Escalation clauses erode savings over time

Most PPA and lease contracts include an annual price escalator of 1–4%, often pegged to RPI or CPI. A 3% annual escalator compounds to an 81% increase over 20 years. Meanwhile, wholesale electricity prices can fall or stay flat. If grid prices drop and your PPA rate keeps climbing, the “saving” versus buying from the grid narrows or disappears entirely. Always check whether the contract has a grid-parity clause that caps the rate at the prevailing grid price.

Complications when you sell your home

A solar lease or PPA is a long-term legal charge tied to your property. When you sell, the buyer must agree to take on the remaining contract. Many mortgage lenders are reluctant to lend against homes carrying an active PPA, because the charge complicates repossession. Early termination fees can run to several thousand pounds — one industry example cited a £12,000 buyout quote on a system with 15 years still to run. Citizens Advice notes that homeowners should read PPA contracts carefully before signing, because exit options are often limited or expensive. Solicitors will flag the encumbrance at conveyancing, potentially slowing or blocking the sale.

Buying outright: the numbers

A 4 kWp system costs £5,500–£8,500 fully installed in 2026, including panels, inverter, scaffolding and MCS certification. VAT on residential solar panels and battery storage is 0% following the 2022 relief. Typical annual bill savings plus SEG income for a south-facing UK roof range from £500 to £850. At a mid-range system cost of £7,000 and £650 annual benefit, payback is around 10–11 years. Quality panels carry 25-year performance warranties, meaning 12–15 years of clear profit after payback. For a full breakdown by system size, see our solar panel cost by system size guide.

You also retain the right to register for SEG yourself, choose the best available rate, switch export supplier freely, and claim all savings from the outset without any contractual ceiling.

Finance and green loans: the middle path

If upfront capital is the obstacle, a green loan is usually better than a lease. Barclays offers a Greener Home Loan (£1,000–£50,000, 2–5 year term) at rates based on personal circumstances; many lenders advertise solar finance at 3–7% APR. Nationwide allows existing mortgage customers to borrow £5,000–£20,000 at 0% interest over 2 or 5 years for energy efficiency improvements. Even a secured personal loan at 5% APR on a £7,000 system typically costs £370 in interest over 2 years — far less than the SEG income and partial bill savings forfeited over a 25-year lease.

A green mortgage top-up or further advance is worth exploring if you are remortgaging: some lenders offer a preferential rate on the green portion, and the improvement adds to the property’s EPC rating, which can benefit future sale value.

When might a lease or PPA make sense?

There are genuine edge cases where a PPA can be rational:

• No access to capital and no borrowing options — if a loan is not available and upfront cash is absent, some export income is better than none.
• Short expected tenure — though note this creates the house-sale complication described above, so it is rarely clean.
• Commercial or multi-unit buildings — commercial PPAs are structured differently and can make sense at scale; this guide covers residential only.

For the vast majority of UK homeowners who can access even modest finance, ownership — outright or via a green loan — will deliver materially better lifetime returns.

Quick comparison

Bottom line

Ownership wins financially in almost every UK residential scenario where the homeowner can access capital or a green loan. The SEG income alone, combined with full bill savings and no lock-in risk, adds up to a substantially better deal over the lifetime of the system. A solar lease or PPA made sense when the Feed-in Tariff was the prize; today, the maths strongly favour buying.