Extension / renovation contractors in the United Kingdom

976 extension / renovation contractors across the United Kingdom, each compared on their portfolio, credential evidence, past work and reviews: the evidence that matters before a project you'll live with. Add your area below to compare their work near you.

No ads · No paid placement · Ranked on evidence only

Extension / Renovation Contractors

Showing the top 12 of 976 extension / renovation contractors

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What to check when hiring extension / renovation contractors in the United Kingdom

MyTrustedTraders ranks on independent public evidence. No ads, no paid placement. Use these checks alongside the evidence on each profile before you decide who to contact.

  • Ask to see a portfolio of completed work like yours, plus recent references you can contact.
  • Check the credentials and registrations that matter for this work, and that they are current.
  • Get a written, itemised quote with scope, assumptions and a staged payment schedule.
  • Compare at least three extension / renovation contractors on the depth of their evidence, not just price.

Which credentials should an extension / renovation contractor have? See the guide →

How to judge an extension / renovation contractor

Independent, no-ads guidance. The trade-specific checks that matter most, the warning signs, and what to ask before you hire. Use it alongside each trader’s public evidence above.

Verify before you hire

  • Check the contractor is a Federation of Master Builders (FMB) member: they require an independent site inspection, credit check, and insurance verification before joining.
  • Confirm they will obtain building regulations approval and hand you the completion certificate when finished: without one, your home can become unmortgageable and unsellable.
  • Look up the company on Companies House to check it has traded for several years and that the directors are not linked to dissolved construction firms.
  • Ask for a structural warranty (NHBC, LABC Warranty, or Premier Guarantee) on any structural work: mortgage lenders require it and it covers major defects for ten years.

Warning signs of a cowboy

  • Asks for a large upfront deposit with nothing signed: extension contractors typically need 10–25% for materials, but only once a clear written contract with a payment schedule is in place.
  • Cannot show completed project photos or provide references from comparable-scale jobs: portfolio is the primary proof of capability for this kind of work.
  • The company was incorporated in the last year or two, or the director is linked to previously dissolved construction companies: a classic sign of phoenix-company risk.
  • Dismisses building regulations as optional or says you can 'sort the certificate later': this is never true for structural or extension work.

Questions to ask before you hire

  • Can you give me the building regulations approval reference, and will you hand over the completion certificate at the end?
  • Are you an FMB member, and can you show me your current public liability insurance certificate?
  • Which structural warranty provider are you registered with, and will this project be covered by a ten-year warranty?
  • Can I have a fixed-price contract with a detailed payment schedule tied to stages of work, rather than paying in advance?

Frequently asked questions

How do I choose a trustworthy extension / renovation contractor?
Compare the public evidence on each profile: how many independent reviews they have and across how many named sources, the rating and how recent it is, any credential evidence, and the company status. An extension / renovation contractor backed by several named sources is harder to fake than one found in only one place.
Does MyTrustedTraders rank or recommend extension / renovation contractors for payment?
No. There are no ads and no paid placement. Extension / renovation contractors are ranked only by the strength of independent public evidence. No one can pay to rank higher, add a badge, or change their reviews.
Where do the reviews come from?
They're imported from named public review sources and always shown with the source named. They aren't reviews written on MyTrustedTraders. We cross-check the same business across sources rather than creating new reviews.
What should I check before hiring an extension / renovation contractor?
Confirm credentials and insurance directly with the extension / renovation contractor, get a written quote, and run the Cowboy Checker on the business first. MyTrustedTraders helps you shortlist on the evidence. It doesn't replace your own checks before you hire.

More ways to check who to trust

Free, independent checks. No ads, no paid placement.

  • Cowboy Checker

    Spot the warning signs of a dishonest business before you hire.

  • Company Health Check

    Check whether the company behind a business is active, dissolved, or in liquidation.

  • Licence Check

    A licence number from a van or quote, checked against every public register included here in one search.

Or browse traders by tradeAll checks and tools