Working file M3
Retrofit heating cost (UK 2026)
Heating stratum cost in 2026: ASHP, GSHP, hybrid, radiator upsize. BUS grant of £7,500 for ASHP and GSHP.
BUS is the largest single grant on a retrofit project at £7,500. It is paid to the installer; you see it on the quote as a reduction.
Surveyed 22 June 2026. Ofgem Q3 2026 cap applied (gas 7.33p, elec 26.11p, gas standing 29.04p). Next scheduled review 26 September 2026 (Q4 cap publication). [ref M3]
By Oliver Wakefield-Smith, Founder, Digital Signet. Corrections to oliver at digitalsignet dot com.