Window / door fitters in the United Kingdom

3,040 window / door fitters across the United Kingdom, each compared on their reviews, credential evidence and evidence from named public sources. Independent evidence, no ads and no paid placement. Add your area below to see who's near you.

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Window / Door Fitters

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What to check when hiring window / door fitters 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.

  • Be wary of high-pressure 'today-only' discounts and a salesperson who won't leave. A reputable window or door firm gives you a written, itemised quote you can take away and compare against others.
  • Never pay the full price up front; a modest deposit with the balance on completion is normal. Ask what deposit protection or insurance-backed guarantee you get if the firm stops trading before fitting.
  • Get the specification in writing (frame material, the glazing units and their energy rating, and any trickle vents) so you can check you got what you paid for.
  • Replacement windows and external doors must be signed off as meeting building regulations. Use an installer registered with FENSA or CERTASS so they self-certify the work and give you the certificate you'll need when you sell.
  • Look for consistent reviews across several named sources, not one polished profile.

Which credentials should a window / door fitter have? See the guide →

How to judge a window / door fitter

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 they are registered with FENSA or CERTASS: this is how they legally self-certify your replacement complies with building regulations.
  • Confirm they offer a deposit protection scheme (DGCOS or TrustMark) so your upfront payment is covered if they go bust before fitting.
  • Ask for an insurance-backed guarantee (IBG) in writing: it must survive company failure, not just last as long as the firm trades.
  • If you live in a conservation area or listed building, verify they understand the planning rules before any work starts.

Warning signs of a cowboy

  • No FENSA or CERTASS registration: you will have to arrange separate council building-control approval, which costs extra and delays a house sale.
  • Demands more than 25–50% upfront with no mention of deposit protection or any written guarantee.
  • Applies same-day or tonight-only pressure to sign: a known hard-sell tactic in double glazing, and a Trading Standards red flag.
  • Quote describes a premium product but the written contract is vague about brand, specification, or glass unit: classic bait-and-switch setup.

Questions to ask before you hire

  • Are you currently registered with FENSA or CERTASS, and can I look up your registration number before signing?
  • Is my deposit protected, and which scheme covers it: DGCOS or TrustMark?
  • What insurance-backed guarantee do you offer, how many years does it run, and who underwrites it if your company closes?
  • Does my property need any planning permission or listed-building consent before you start?

Frequently asked questions

How do I choose a trustworthy window / door fitter?
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. A window / door fitter backed by several named sources is harder to fake than one found in only one place.
Does MyTrustedTraders rank or recommend window / door fitters for payment?
No. There are no ads and no paid placement. Window / door fitters 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 a window / door fitter?
Confirm credentials and insurance directly with the window / door fitter, 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