Solar Panels UK 2026: Costs, Savings and Payback

A typical UK home pays £5,000–£8,000 for solar in 2026 and saves £400–£700 a year. Here's how the maths works, what affects payback, and when batteries are actually worth it.

How much do solar panels cost in 2026?

For a typical UK 3-bed semi, a 4 kWp solar PV system costs roughly £5,000 to £7,500 fully installed in 2026. Prices vary by panel quality, roof complexity and whether you add a battery.

A rough breakdown:

- 3 kWp system (small home): £4,000–£5,500 - 4 kWp system (typical 3-bed): £5,000–£7,500 - 6 kWp system (4-bed or high usage): £7,500–£10,500 - Add a 5 kWh battery: +£3,500–£5,000

0% VAT on residential solar applies to installations until 31 March 2027, which keeps prices noticeably lower than pre-2022. The 28 October 2026 Budget confirmed the rate returns to 5% from 1 April 2027, adding roughly £250 to £375 to a typical £5,000 to £7,500 system.

How much can you actually save?

A 4 kWp system in the UK typically generates 3,400–4,000 kWh/year. What that's worth depends on how much you use directly vs export back to the grid.

With a typical mix of self-use and export at 2026 prices:

- Direct savings on your bill: £350–£500/year - Export earnings via Smart Export Guarantee (SEG): £80–£200/year - Total annual benefit: roughly £430–£700/year

That puts payback for most homes at 8–13 years, with panels guaranteed for 25+ years.

What affects your payback

Four things move the number more than anything else: