UK: is home solar worth it?
A typical 4kW residential system — compiled August 2026.
Typical 4kW system, installed cost
£7,500
Payback estimate
~34 years
Estimated simple payback: £7,500 system cost ÷ ~£221/year export income at 1,700 kWh exported/year via Smart Export Guarantee (SEG) (£0.13/kWh)
0% VAT on residential solar installs (through Mar 2027) — reflected in the cost above. Source: UK solar installer average quotes 2026; typical SEG export rate
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System cost, export rate and payback vary by installer, roof orientation, and your own usage pattern — this is a typical-scenario estimate, not a quote. This is not financial advice.