Solar panel prices in the UK have dropped significantly over the last five years. A typical 4kW system (the most common size for UK homes) now costs between £5,000 and £7,000 fully installed, including 0% VAT. That is roughly 20% less than in 2022.
With electricity prices still well above pre-2021 levels, the payback period for solar panels in the UK is now shorter than ever. In this guide, we break down the real costs, savings, and payback periods for solar panel installations in 2026.
Prices checked: July 2026.
Solar Panel Prices by System Size
| System Size | Number of Panels | Typical Annual Generation | Installed Price (0% VAT) |
|---|---|---|---|
| 3kW | 7-8 panels | 2,550 kWh | £4,500-£5,500 |
| 4kW | 10-11 panels | 3,400 kWh | £5,500-£7,000 |
| 5kW | 13-14 panels | 4,250 kWh | £7,000-£8,500 |
| 6kW | 15-16 panels | 5,100 kWh | £8,500-£10,500 |
| 8kW | 20-22 panels | 6,800 kWh | £11,000-£14,000 |
What Is Included in the Installed Price
- Solar panels (typically 420W-450W each in 2026)
- String inverter (or microinverters for premium installs)
- Roof mounting system
- Cabling and isolation switches
- Scaffolding
- Installation labour
- VAT at 0%
- MCS certification paperwork
- DNO notification
What Is Extra
- Battery storage: £2,500 to £9,000 extra depending on size
- Bird-proofing (mesh around panel edges): £200-£400
- EV charger: £800-£1,500
- Complex roof scaffolding (tile, slate, high pitch): £300-£600
Solar Panel Prices by Brand
| Panel Brand | Panel Wattage | Price per Panel | Typical 4kW System Cost |
|---|---|---|---|
| JA Solar | 430W-450W | £120-£160 | £5,500-£6,500 |
| Longi | 430W-450W | £110-£150 | £5,500-£6,500 |
| Trina Solar | 430W-450W | £130-£170 | £5,800-£6,800 |
| Canadian Solar | 430W-450W | £130-£180 | £5,800-£7,000 |
| SunPower | 420W-440W | £250-£350 | £7,500-£9,000 |
| REC | 420W-440W | £200-£300 | £7,000-£8,500 |
Inverter Types and Costs
| Inverter Type | Typical Cost | Pros | Cons |
|---|---|---|---|
| String inverter | £500-£1,200 | Cheapest option, simple | Single point of failure, shading affects whole string |
| Microinverters | £1,500-£2,500 | Panel-level optimisation, no single failure point | More expensive, more components |
| Hybrid inverter | £1,200-£2,000 | Works with solar + battery, future-proof | More expensive than string inverter alone |
| Optimisers | £400-£800 | Added to string inverter for shading mitigation | Mid-range cost, improves string inverter performance |
If you plan to add a battery later, a hybrid inverter now saves you replacing the inverter later. If you have shading on part of your roof, microinverters or optimisers prevent the shaded panel from dragging down the whole array.
Savings and Payback
Estimated Annual Savings
| System Size | Annual Generation | Saving on Bills (50% self-use) | SEG Export Income (at 15p/kWh) | Total Annual Value |
|---|---|---|---|---|
| 3kW | 2,550 kWh | £320 | £190 | £510 |
| 4kW | 3,400 kWh | £425 | £255 | £680 |
| 5kW | 4,250 kWh | £530 | £320 | £850 |
| 6kW | 5,100 kWh | £640 | £380 | £1,020 |
Payback Period
| System Size | Installed Price | Annual Value | Payback Period |
|---|---|---|---|
| 3kW | £5,000 | £510 | ~10 years |
| 4kW | £6,000 | £680 | ~9 years |
| 5kW | £7,500 | £850 | ~9 years |
| 6kW | £9,500 | £1,020 | ~9 years |
Battery Storage With Solar
Adding a battery roughly doubles the usable solar energy. Without a battery, you use about 30-40% of your solar generation directly. With a battery, that figure rises to 70-80%.
| Setup | Installed Price | Annual Value | Payback |
|---|---|---|---|
| 4kW solar only | £6,000 | £680 | ~9 years |
| 4kW solar + 5kWh battery | £9,000 | £850 | ~10.5 years |
| 4kW solar + 10kWh battery | £12,000 | £950 | ~12.5 years |
Solar Panel Grants and Support
- 0% VAT on solar panel installations (automatic, no application needed)
- Smart Export Guarantee (SEG) — your supplier pays you for exported electricity (rates vary from 5p to 15p per kWh)
- ECO4 — fully funded solar panels (and sometimes batteries) for low-income households
- Home Upgrade Grant (HUG) — for off-gas-grid homes in England
There is no direct government grant for solar panels for the average homeowner in 2026, though 0% VAT saves you roughly £1,200 on a typical 4kW installation.
Frequently asked questions
For most UK homes with a south-facing or east/west roof, yes. Payback is typically 8-12 years and panels last 25-30 years. With current electricity prices, a 4kW system saves roughly £680 per year.
A 3-bedroom house typically installs a 3.5kW to 4kW system, costing £5,500 to £7,000 fully installed. This covers roughly 50-60% of the home's annual electricity usage.
Solar panels are permitted development in most of the UK. You do not need planning permission unless your home is listed or in a conservation area. Always check with your local council.
Solar panels typically produce 80-85% of their original output after 25 years. Most manufacturers offer a 25-year performance warranty. The inverter typically needs replacing after 10-15 years at a cost of £500 to £1,500.
The ECO4 scheme can fully fund solar panels for low-income households receiving certain benefits. For most homeowners, there is no "free solar" scheme — ignore companies offering "free solar panels" as they typically involve a lease or PPA agreement.
A typical 4kW system saves £50 to £70 per month on electricity bills, plus £20-£30 per month from SEG export payments, for total savings of roughly £70-£100 per month.
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