Are Solar Panels Worth It in the UK? An Honest 2026 Verdict

Why It Usually Is

Solar earns you money two ways. Every kWh you use yourself is one you don't buy at 26.32p (the price cap from 1 October to 31 December 2026). Every kWh you don't use goes to the grid, and the best open export tariff, Octopus Outgoing, pays 12p for it. On a 4kWp system in central England that's about £450 a year in avoided bills and £250 in export income, which is where the £700 comes from.

The other things in its favour right now:

• 0% VAT until 31 March 2027. It goes back to 5% from 1 April 2027, so the same £6,000 system will cost £6,300.
• Panels last. The usual product warranty is 25 years, and the only big cost you should budget for in that time is an inverter replacement, which we allow about £800 for around year 12.
• Everyone's doing it. MCS certified 267,032 solar installations in 2025, a record, so there's no shortage of installers to compare.

When It Isn't

• You're moving within a few years. At an 8 to 9 year payback, someone leaving in five years won't get their money back in bills. Panels can make a house more attractive to buyers, but don't count on recovering the full cost in the sale price. Our guide to whether solar adds value has the evidence.
• North-facing roof. PVGIS, the European Commission's solar model, puts a north roof at around 45% less output than south. East or west costs only about 20 to 22%, and can work well split across both sides.
• Heavy shading from trees, chimneys or the house next door. Get a survey: the model above assumes an unshaded roof.
• You're on a 4p export tariff and won't switch. Then over half your generation earns a third of what it could. Switching to a 12p tariff is free.
• A listed building or a flat you don't own the roof of. Permission is the problem, not the maths.

What Makes It Worth More

The one lever that really moves the numbers is how much of your own power you use. Exported power earns 12p; power you use yourself saves 26.32p. So anything that shifts your use into daylight helps:

• Running the dishwasher and washing machine in the day
• An electric car charged from the panels (see our solar and EV guide)
• A heat pump, especially for hot water in spring and summer (see solar with a heat pump)
• A solar diverter that dumps surplus into the immersion heater

On our model, pushing self-use from 45% to 70% lifts the yearly benefit from about £701 to £837 on a 4kWp system and cuts payback on £6,000 to about 7 years.

What You Don't Need

A battery, on payback alone. A battery only earns the gap between the import price and the export price on each kWh it moves, about 14p. That's why a retrofit battery doesn't pay for itself inside its warranty at today's prices. Add one for backup power or if you're fitting it with the panels anyway, but try the checker with and without: on most roofs panels alone pay back faster. Our battery guide runs the numbers properly.

How Long Until It Pays For Itself?

That's central England, south-facing, 45% used at home, 12p export, prices held flat. Further south it's quicker (PVGIS gives Plymouth about 13% more output than Birmingham), further north slower. For the full cost breakdown see our solar panel costs guide, and to size a system for your usage, how many solar panels you need.

Can you get them for less? Some lower-income households can get panels free through ECO4, the Warm Homes: Local Grant or Nest. Check in our free solar panels guide. If you'd rather spread the cost, see how to pay for solar.

For every scheme that can bring the cost down, across England, Scotland, Wales and Northern Ireland, see our solar panel grants guide.