Retrofit cost London (2026)

London labour rates run 15 to 30 percent above the national mean across the heating, fabric and ventilation trades. The mean ASHP install in London sits at around £14,500 vs the national £12,500.

A large share of inner-London stock is in a conservation area or carries an Article 4 direction. EWI is usually ruled out; IWI plus heritage-glazing is the standard route.

Warmer Homes London continues to operate as the LA-led overlay; means-tested route via local boroughs. Useful for the cohort that also qualifies for ECO4 / GBIS.