How to Choose a Reliable Builder UK: 10 Essential Checks

Last updated: April 2026

The 10-Point Builder Checklist

1. Check Trade Body Membership

Reputable builders are typically members of recognised trade bodies that vet their members:

• Federation of Master Builders (FMB) — the UK's largest trade association for builders. Members are independently vetted, inspected, and must carry insurance
• TrustMark — a government-endorsed quality scheme. TrustMark-registered builders must meet strict standards
• NHBC — essential for new-build homes. NHBC registration means the builder can offer the NHBC Buildmark warranty
• Checkatrade / Rated People — these platforms verify basic credentials, but membership alone is not a guarantee of quality

2. Verify Insurance

Every builder should carry:

• Public liability insurance: Minimum £2 million (£5 million for larger projects). Ask to see the certificate and check the expiry date
• Employer's liability insurance: Required by law if they have employees
• Professional indemnity insurance: Important if they are providing design services

Tip: Call the insurance company to verify the policy is current. Some builders show expired or fake certificates.

3. Get 3 Written Quotes

Always get at least 3 written quotes from different builders. Each quote should:

• Cover the same scope of work (provide each builder with the same brief)
• Include a detailed breakdown of labour, materials, and VAT
• State the estimated start date and completion date
• Specify what is and isn't included

Warning: Be wary of quotes significantly cheaper than others. The cheapest quote often means the builder is cutting corners on materials, will add extras later, or is inexperienced.

4. Ask for References

Request at least 3 references from recent projects (within the last 12 months). Contact them and ask:

• Was the work completed on time and to budget?
• Was the builder easy to communicate with?
• Were there any problems, and how were they resolved?
• Would you use them again?

Best practice: Ask to visit a completed project in person. A good builder will be happy to arrange this.

5. Check Online Reviews

Look at reviews across multiple platforms:

• Google Business Profile
• Checkatrade or Rated People
• Trustpilot
• Facebook reviews

Look for patterns rather than individual reviews. A few negative reviews among many positives is normal. But consistent complaints about the same issues (delays, communication, quality) are red flags.

6. Use a Written Contract

Never proceed without a written contract. It should include:

• Detailed scope of work
• Total price and payment schedule (tied to milestones)
• Start date and estimated completion date
• Materials specification
• What happens if there are delays or changes
• Defects liability period (typically 6-12 months)
• Dispute resolution process

For larger projects (£30,000+), consider using a JCT Minor Works contract — a standard industry contract that protects both parties.

7. Agree a Payment Schedule

A fair payment schedule might look like:

Hold back 5-10% as retention for 3-6 months after completion to cover any defects that appear. This is standard industry practice.

8. Verify Their Business

• Check Companies House if they are a limited company — look for filing history and accounts
• Verify their VAT registration — builders earning over £90,000/year must be VAT-registered. If they claim to be too small for VAT but quote for a £50,000 project, something doesn't add up
• Check for a fixed business address — avoid builders who only have a mobile number and no website

9. Spot the Red Flags

Walk away if a builder:

• Asks for large cash payments upfront (more than 15%)
• Won't provide a written quote or contract
• Pressures you to start immediately ("I have a gap in my schedule this week")
• Won't show proof of insurance
• Has no online presence, reviews, or references
• Offers a "cash price" to avoid VAT — this is tax evasion
• Won't specify materials or give vague descriptions

10. Understand Your Rights

Under the Consumer Rights Act 2015, any building work must be:

• Carried out with reasonable care and skill
• Completed within a reasonable time (if no time was agreed)
• At a reasonable price (if no price was agreed)

If work is substandard, you have the right to ask the builder to put it right. If they refuse, you can claim through Trading Standards or the courts.

Next Steps

Looking for trusted builders in your area? Get free, no-obligation quotes from verified builders through Better Home Hub. We check credentials so you don't have to.