See how much a solar PV system could save you, how much you'd earn exporting electricity, and how quickly it pays back. UK-specific figures for a typical home in the South West.
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Our retrofit assessment looks at solar alongside insulation, heating and ventilation — making sure every measure works together rather than against each other.
Book a free retrofit assessment →How is this calculated?
Solar generation is modelled using UK-specific irradiance data adjusted for orientation, shading and system efficiency.
Base generation: 950 kWh per kW per year (South-facing, no shading, South West England).
| Factor | Effect on generation |
|---|---|
| South facing | 100% |
| South-East / South-West | 95% |
| East / West | 80% |
| North | 50% |
| No shading | 100% |
| Some shading | 85% |
| Heavy shading | 60% |
Self-consumption (how much you use directly vs export): home all day ~50%, mixed ~35%, mostly out ~25%. With battery: ~80% regardless.
Rates used: Electricity import 28p/kWh; SEG export 15p/kWh (mid-range — Octopus and others offer 5p–22p depending on tariff).
Cost assumptions: £1,400/kW installed cost (typical UK 2026 prices), plus £4,000 battery if selected.
CO₂: UK grid intensity 207g CO₂/kWh (2024 BEIS figure, falling each year — actual lifetime CO₂ avoided will likely be lower as the grid decarbonises).
For an exact quote, the only reliable method is a survey of your specific roof. Our retrofit assessment covers solar as part of a whole-house plan.