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Cost GuidesUpdated May 2026By TradeMatch Editorial Team·7 December 2025·Updated 12 April 2026·7 min read
Solar Panel Costs UK 2026: How Much Do Solar Panels Cost?
Solar panels have never been more affordable, with prices dropping 60% in the last decade. Here is what you can expect to pay in 2026 and how long it takes to recoup your investment.
Solar Panel Costs by System Size
| System Size | Panels | Cost (installed) | Annual Savings |
|---|---|---|---|
| 3kW | 8 panels | £4,000–£5,500 | £400–£600 |
| 4kW | 10 panels | £5,000–£7,000 | £500–£800 |
| 5kW | 13 panels | £6,000–£8,000 | £600–£1,000 |
| 6kW+ | 16+ panels | £7,500–£10,000 | £750–£1,200 |
All installers must be MCS certified to qualify for the Smart Export Guarantee (SEG), which pays you for excess electricity exported to the grid.
Solar Battery Storage
Adding a battery lets you store excess solar energy for evening use:
- 5kWh battery — £2,500–£4,000
- 10kWh battery (e.g. Tesla Powerwall) — £4,500–£6,500
- 13.5kWh battery — £5,500–£8,000
Batteries can increase self-consumption from 30% to 70–80%, significantly boosting savings.
Is Solar Worth It?
At current electricity prices (28p/kWh), a 4kW system with a 10kWh battery can save £700–£1,000/year. Payback period: 7–12 years. Lifespan: 25–30 years. Property value increase: 2–4% according to recent studies. Solar panels are maintenance-free apart from occasional cleaning.
Frequently Asked Questions
Do I need planning permission for solar panels?
Solar panels on a house are usually permitted development and do not need planning permission, provided they do not protrude more than 200mm from the roof surface. Listed buildings and conservation areas may have restrictions.
Do solar panels work in the UK climate?
Yes. Solar panels generate electricity from daylight, not direct sunlight. The UK receives enough light for solar panels to produce significant electricity year-round, with peak output in April–September.
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