Independent comparison of solar panel systems for UK homes. See 2026 installation costs, typical savings, payback times and what grants may be available.
Costs depend on system size, roof type, and installer
| System size | Typical home | Installed cost | Annual generation | Annual saving |
|---|---|---|---|---|
| 3kWp | 2-bed flat / small terrace | £5,000 – £7,000 | ~2,550 kWh | £400 – £600 |
| 4kWp | 3-bed semi-detached | £6,500 – £9,000 | ~3,400 kWh | £500 – £800 |
| 5kWp | 4-bed detached | £8,000 – £11,000 | ~4,250 kWh | £650 – £1,000 |
| 6kWp | Large detached | £10,000 – £14,000 | ~5,100 kWh | £800 – £1,200 |
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Costs are indicative based on industry data for August 2026. Actual costs depend on property, roof access, scaffolding requirements and installer. Savings assume typical UK energy prices and self-consumption rates.
About these savings estimates: Annual savings depend on roof orientation, shading, system size, electricity tariff, self-consumption rate and Smart Export Guarantee payments. Energy Saving Trust estimates direct bill savings for a typical 4.5kWp system at roughly £190–£330 per year before export income. Combined savings including SEG payments vary significantly by household. The figures above are indicative ranges for illustrative purposes.
Solar panels can be a sound long-term investment for suitable UK properties. With energy prices elevated and Smart Export Guarantee (SEG) payments available for exported electricity, the case for solar is stronger than it has been for many years.
Currently there is no universal national solar grant in England for owner-occupiers. However, funding may be available through:
Grant eligibility changes regularly. We recommend checking our 2026 grants guide for the latest position, or using our free eligibility check.
A 4kWp solar system suitable for a typical 3-bedroom semi-detached house costs approximately £6,500 to £9,000 installed in 2026. The total depends on roof access, panel type, and installer. Adding a battery typically adds £3,000 to £6,000.
Payback periods for UK solar installations typically range from 8 to 14 years depending on system cost, your electricity usage patterns, and whether you export surplus to the grid via the Smart Export Guarantee. Well-sited systems with high self-consumption can achieve shorter payback.
Yes — solar panels generate electricity from daylight, not direct sunlight. Output is reduced on very overcast days but panels still produce meaningful electricity throughout the UK year, including in winter months and during typical British weather.
A solar battery allows you to store daytime generation for use in the evening, increasing self-consumption and reducing reliance on grid electricity. Battery costs have reduced significantly and the case for adding storage has strengthened with higher electricity prices. Payback is typically longer than panels alone, but combined systems can make strong financial sense for high-usage households.
Cost data: Energy Saving Trust benchmarks (August 2026) and UK installer quotes. Grants: GOV.UK and official scheme operators. Savings: Ofgem Q3 2026 price cap £1,862/year. All figures indicative. Last reviewed: August 2026. View scoring methodology →