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?
Do solar panels work in the UK climate?
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