Quick Answer
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 RecommendationsThe best builders rarely advertise — they are b...
Key Information
- Last Updated:
- 5 May 2026
- Category:
- Building Advice
- Reading Time:
- 1 min read
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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I'm excited to start my extension, but it's daunting choosing a builder! I've heard horror stories about delays. Any tips on checking their insurance policies?
Don't forget to ask for proof of insurance. It's not uncommon for builders to overlook this, and you don't want to be left footing the bill for damages.
I've just started planning our extension. Any tips on how to spot fake VAT numbers?
I understand the importance of checking insurances and registrations, but could you clarify what you mean by 'a registered business address'? What does that entail?
Also check if they're registered with a competent persons scheme, such as CHAS or Safecontractor. It's another sign of professionalism and commitment to safety.
I appreciate your thorough checklist, but could you clarify what constitutes a 'straightforward' extension? Every project seems unique!
I've just started planning my loft conversion. Any tips on how to ask neighbours for builder recommendations without sounding too nosey? 😊
While I agree asking around is crucial, I'm curious about why you don't advise checking online reviews and ratings platforms? Some people might not be comfortable sharing their experiences on local groups.
Regarding insurance, wouldn't £1 million be sufficient for smaller projects? Or is £5 million really necessary?