Finding a reliable builder is the single most important decision in any building project. A bad builder can turn a straightforward extension into a nightmare of delays, cost overruns, and substandard work.
Start With Recommendations
The best builders rarely advertise — they are booked months ahead on word of mouth. Ask neighbours with recent extensions, check local Facebook groups, and ask your architect or structural engineer.
Essential Checks
Every builder should have: public liability insurance (minimum £5 million for structural work), employers liability insurance, a registered business address, and a VAT number if their turnover exceeds the threshold.
Getting Quotes Right
Provide identical specifications to every builder quoting. A proper quote should be itemised with labour, materials, and provisional sums for unknowns.
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