Disclaimer
Guide estimates only. Your real price comes from written quotes, not from any website.
Estimates only
Every price on this site, including calculator outputs, cost tables and worked examples, is an independent guide estimate compiled from published 2026 UK cost data and cross-checked against sources such as Checkatrade, the FMB and GreenMatch. It is not a quote and no installer has priced your home. Real prices depend on your property, measurements, specification, access and local labour rates, and can sit outside our ranges.
What to do instead of relying on us
Use our figures to set expectations and to spot an inflated quote, then get at least three written quotes from FENSA-registered installers for the same specification. Our guide to avoiding overcharging explains how to compare them like for like.
Regulations and grants
Statements about building regulations (such as Part L) and grant schemes reflect the position at the date each page was last updated. Rules change. Confirm the current position on GOV.UK and FENSA before acting.
How we keep figures honest
Every number traces to a published source and is price-checked by Tom Bradley, a FENSA-registered installer. The full approach, including what we do not claim, is on our methodology page.