Free, no-obligation estimate
Two ways to start: design your extension and get a guide price in 60 seconds, or just send us your details and we'll be in touch. Both are free, with no obligation.
Pick your house, extension type and finish — see it drawn, get a guide build cost and your likely planning route in about 60 seconds. No email needed to see the number.
Open the Extension BuilderTell us a little about your project using the form below and we'll call you back — usually the same day — to arrange a free site visit. Or call us now on 020 3051 9430.
Send my detailsStep 1 of 4 · takes about 30 seconds
Want a guide price first? Design it in the Extension Builder — no email needed.
“We spoke to a few companies before deciding to go with The Extension Company and they just seemed the easiest to deal with. No pushy sales, just honest advice. They kept us updated and the whole process was a lot less stressful than we expected”
“From the initial site visit onwards to my property in Barnet, we felt that the team actually listened to what we wanted. They suggested a few changes to the layout that we hadn't considered, and those changes have made a huge difference. Would definitely use again and recommend”
Shown word for word from our Google profile. Read all 16 reviews on Google
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Speak to the team about your extension, the planning route or a rough budget. Lines open every day, 9am to 8pm.