Cost My Extension

Check a property Costs by borough Sample report For architects Start your report

Ten questions · about three minutes

Tell us about your home and the job

Nothing is charged until you have seen what we found.

Cost My Extension

The real cost of your extension, before you get a single quote.

Check a property Costs by borough Sample report For architects Start your report Terms Privacy Contact

This report is an informed estimate built from public data about your property and current London build costs. It is not a survey, a quote, a valuation or planning advice. Always get written quotes and, where noted, professional advice before committing to work.

costmyextension.co.uk · London · 2026

Ten questions · about three minutes

Tell us about your home and the job

Nothing is charged until you have seen what we found.

Step 01 of 07 · Address

Your postcode