How it works
The straightforward path to your London extension.
We built LondonExtensions.uk for one thing: getting London homeowners from idea to a costed shortlist of vetted builders — quickly, and with no auctions.
01
Tell us about your home
A 7-step wizard covering property type, borough, extension goals and finish.
02
See a realistic estimate
We combine London per-sqm benchmarks with your inputs to produce a range you can trust.
03
Meet vetted builders
Up to 3 KYB-verified specialists who work in your borough get in touch within 24 hours.
Our vetting
Every builder is KYB-verified and insurance-checked.
We verify company details, directors, insurance, and past extension work across Greater London — so the shortlist you meet is small, relevant and safe to work with.
KYB Verified builders
Insurance checked
Greater London specialists
Real references & reviews