Work out whether you are allowed to build it — then what it costs Free quotes from local extension specialists · UK-wide
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For anything about the site itself. If you want quotes for a job, the quote form is the faster route.

What to contact us about

The form below reaches us for all of the following:

  • Corrections. If a planning limit, a regulation reference or a cost figure on this site is wrong or out of date, tell us which page and what is wrong. We would rather fix it than leave it.
  • Your data. Access, correction, deletion or withdrawal of an enquiry — see the privacy notice for what we hold and for how long.
  • Complaints about a builder. We are not party to your contract and cannot arbitrate it, but we do want to know: tell us what happened and we will raise it with our lead partner, who can act on their own network.
  • Press, partnerships and everything else.

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Postal address

House Extension Expert
60 Tottenham Court Road, Suite 6585a, Fitzrovia, London, United Kingdom, W1T 2EW

Please do not send documents you need returned — this is a registered office address, not a staffed office.

What we cannot help with

We cannot tell you whether your specific extension will get planning permission, price your job, recommend a particular builder, or intervene in a dispute. For a decision on your property you need your local planning authority; for advice on your site you need a professional you have appointed.

House Extension Expert editorial team · Last updated: 2 September 2026