Calculate the cost and ROI of your solar PV project with our free online calculator. Get an instant estimate based on your specific requirements and local pricing data for 2026.
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2026 UK Solar Averages
| System Size | Ideal For | Average 2026 Cost | Annual Generation |
|---|---|---|---|
| 3 kW | Small Terrace (1–2 beds) | £5,000 – £6,500 | ~2,600 kWh |
| 4 kW | Semi-Detached (3 beds) | £6,000 – £8,000 | ~3,400 kWh |
| 5 kW | Detached (4+ beds) | £7,000 – £9,500 | ~4,200 kWh |
| 6 kW+ | Homes with EV / Heat Pump | £8,000 – £11,000 | ~5,100+ kWh |
Semantic Q&A
Are domestic solar installations subject to VAT in the UK?
0% VAT applies to qualifying residential solar installations in the UK. This relief covers the supply and installation of solar PV, inverters, and battery storage. It is scheduled to last until 31 March 2027.
How does the Smart Export Guarantee (SEG) impact payback calculations?
The Smart Export Guarantee (SEG) mandates licensed electricity suppliers to pay domestic generators for surplus solar electricity exported back to the National Grid. Current 2026 SEG tariffs range from 12p to 25p per kWh depending on the energy provider.
What role does an MCS certification play in grid connection?
Installations must be certified by the Microgeneration Certification Scheme (MCS). An MCS certificate guarantees compliance with UK building regulations and is legally required by Distribution Network Operators (DNOs) before export meter registration.
Does a solar battery improve financial self-consumption?
Yes. Adding a lithium iron phosphate (LiFePO4) battery storage unit captures daytime photovoltaic generation surplus, shifting electricity consumption to evening peak hours and reducing reliance on high-tariff grid imports.