Solar panels in
London

The local picture

Why solar works in London

With average house prices at £530,000 — well above the England average — a typical solar installation in London represents a small fraction of property value. The £6,800 cost of a standard 4kW system is roughly 1.3% of the average home price, yet delivers annual savings of £700–£1,000 from day one.

Only 53% of homes in London currently have an EPC rating of C or above — above average. That means roughly 47% of the local housing stock will need energy efficiency improvements as regulations tighten. Solar panels improve a home's EPC rating and can be the difference between a D and a C, making them a practical upgrade for homeowners planning to sell or let.

Around 20% of properties in the London area are not connected to the mains gas grid — an high proportion. These homes, often using oil, LPG or electric heating, benefit most from solar because they're already paying higher per-unit energy costs. For gas-connected homes, the financial case for solar still stacks up through electricity bill savings and SEG export income, though the savings per kWh are smaller.

London-specific considerations

• Planning permission: Solar panels are permitted development on most London homes, but conservation areas (common in inner London) and listed buildings may require council approval. Check with your borough before proceeding.
• Flat roofs: London has a higher proportion of flat-roofed properties than most UK cities. Flat-roof mounted panels using tilt frames work well and avoid planning issues, though they produce 5–10% less than an optimally pitched roof.
• Scaffolding costs: London scaffolding tends to cost 20–30% more than the national average due to parking permits and congestion zone access. Factor £500–£1,200 extra into quotes.
• Urban shading: Taller buildings in built-up areas can cast shadows on neighbouring roofs. Use the shading option in the calculator above to see the impact — it's usually 10–20% for partial shade, not a dealbreaker.