What warranty should I expect from a UK loft conversion specialist?

Standard UK loft conversion specialist 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 loft conversion specialist 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.