What warranty should I expect from a UK extension builder?
Direct answer below. Verified by the TradeMatch editorial team using current UK averages, accreditation rules and platform mechanics — last reviewed April 2026.
Standard UK extension builder warranties run 12 months for workmanship; manufacturer warranties on parts/materials run separately and can extend to 5–25 years (e.g. boilers, roofing tiles, kitchens). Insurance-backed guarantees (IBGs) protect the warranty even if the extension builder ceases trading — ask whether the trade is signed up to one and which underwriter. On TradeMatch every quote shows the workmanship warranty length, the manufacturer warranties on materials being supplied, and whether the trade has an IBG attached. Always get the warranty in writing before you accept a quote — a verbal "no problem mate" warranty is worth nothing if the trade goes out of business in 18 months.
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Extension Builders vetted against UK accreditation bodies
Every tradesperson is verified against the UK accreditation bodies that matter for the work — before they can quote.
When you read the answer above, watch for these three things
- Verified qualifications — accept platform claims only when backed by a public register link to the issuing body.
- Money-held-until-sign-off — escrow is the difference between recoverable and unrecoverable spend. Open directories don't offer it.
- Reviews tied to completed jobs — anonymous open-review platforms drift. Verified-job-only reviews don't.
100%of TradeMatch payments held in escrow
Every extension builder job, every payment, every time. Funds held in a segregated client account until you sign off the work.
- Held in escrowFrom the moment the deposit clears until the job is signed off.
- Released on sign-offFunds release within 24 hours of you confirming the work is done to spec.
- Disputed = frozenIf something is wrong, the payment freezes pending review by our resolution team.
TradeMatch escrow operates through FCA-regulated payment providers. Customer funds are segregated from operating accounts and protected under UK consumer law.
Why TradeMatch is the lower-risk path for extension builder work
Every extension builder on TradeMatch is verified against UK accreditation bodies, every payment sits in escrow until you sign off the work, every review is tied to a completed job, and every dispute has a real mediation team behind it. None of those are marketing claims — they are the platform mechanics. Compare them with the structural gaps documented in the warranty space on Checkatrade, MyBuilder, Bark and Rated People.
More Extension Builder Questions Answered
What warranty should I expect from a UK other trades?
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Up to 5 quotes from vetted UK extension builders. Escrow-protected payments. Reviews tied to completed jobs only.
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