What to Look for When Hiring a Builder

Hiring a builder is one of the biggest financial commitments most homeowners will make outside of buying the property itself. Extensions, loft conversions, and renovations routinely run into tens of thousands of pounds. Getting the right builder makes the difference between a project that transforms your home and one that turns into a stressful, expensive nightmare.

This guide covers everything you need to know about finding and vetting a builder in the UK, with practical advice that actually helps you make a good decision.

The Builder Landscape in the UK

Unlike electricians and gas engineers, builders in the UK do not require a specific licence to operate. Anyone can call themselves a builder and start taking on work. This makes it especially important to do your homework before handing over money.

That said, there are several voluntary accreditation schemes and trade bodies that separate the professionals from the cowboys.

Key Accreditations and Trade Bodies

Federation of Master Builders (FMB)

The FMB is the largest trade body for builders in the UK. Members are independently vetted, must carry insurance, and agree to abide by a code of practice. FMB membership is one of the strongest indicators that a builder operates professionally.

FMB members also participate in the MasterBond warranty scheme, which provides insurance-backed guarantees on work — meaning if the builder goes out of business, you are still covered.

Checkatrade and TrustMark

Checkatrade verifies identities, qualifications, and insurance. TrustMark is a government-endorsed quality scheme that covers a range of trades. Both provide a degree of vetting, though neither is as rigorous as FMB membership.

NHBC Registration

For new-build projects, NHBC (National House Building Council) registration is important. NHBC-registered builders must meet specific construction standards and provide a 10-year warranty on new homes.

How to Find a Good Builder

Start with Recommendations

The single best way to find a builder is through someone who has used them. A friend who had their kitchen extended last year, a colleague who had a loft conversion — these firsthand experiences are invaluable.

If you are in South Yorkshire, ask around in Doncaster, Sheffield, Rotherham, or Barnsley. Local builders with strong reputations tend to be well known in their communities.

Use Verified Directories

RestoreTrade verifies every business listing against Companies House records and confirms they are genuinely operating in the area. You can browse verified builders or search by your postcode to find builders near you.

The advantage of a verified directory over a general listing site is accountability. If a business has been checked and confirmed as a real, registered company, you have far more recourse if something goes wrong.

Check Their Track Record

Ask any builder you are considering for:

• References from recent clients — and actually call them
• Photos of completed projects similar to yours
• Details of current or recent projects you can visit
• Their Companies House registration (if they are a limited company)

A builder who is proud of their work will have no problem sharing this information.

Understanding Quotes and Contracts

Get Three Written Quotes

This is standard advice for good reason. Three quotes give you a baseline for comparison. But do not simply choose the cheapest — understand what each quote includes.

A proper quote should detail:

• Scope of work — exactly what will be done
• Materials — what will be used and who supplies them
• Timeline — start date, milestones, and expected completion
• Payment schedule — when payments are due and how much
• Contingency — how unexpected costs will be handled

Quote vs Estimate

A quote is a fixed price for the work described. An estimate is an approximate cost that can change. Make sure you know which you are getting. For any project over a few thousand pounds, insist on a fixed quote with a clear scope.

Payment Structure

A reasonable payment structure for a building project might look like:

• 10-15% deposit to secure the start date and order materials
• Stage payments at agreed milestones (e.g. foundations complete, walls up, roof on)
• Final payment on satisfactory completion, ideally with a small retention held for 3-6 months

Never pay more than 25% upfront. Never pay the full amount before work is complete. A builder who demands large upfront payments is a significant red flag.

Red Flags to Avoid

• No written contract — verbal agreements are unenforceable for large projects
• Demands large deposits — anything over 20% before work starts is concerning
• Cannot provide references — experienced builders have happy clients
• No insurance — public liability and employer’s liability insurance are essential
• Vague timeline — a professional builder can give you a realistic schedule
• Pressure to commit quickly — “I can only hold this price until Friday” is a sales tactic, not a building practice
• Only accepts cash — suggests they may not be operating legitimately
• No company registration — limited company status means accountability

Insurance and Warranties

Public Liability Insurance

Any builder working on your property should carry public liability insurance, typically at least one million pounds of cover. This protects you if their work causes damage to your property or injury to a third party.

Employer’s Liability Insurance

If the builder employs anyone (including subcontractors in some cases), they are legally required to carry employer’s liability insurance of at least five million pounds.

Warranties and Guarantees

Ask about guarantees on the work. FMB members offer insurance-backed guarantees through MasterBond. For structural work, you may want to consider an insurance-backed warranty from a provider like LABC (Local Authority Building Control) Warranty.

Building Regulations and Planning Permission

Your builder should know whether your project requires:

• Planning permission — for extensions, loft conversions, and changes to the external appearance
• Building Regulations approval — for structural changes, electrical work, drainage, and energy efficiency
• Party wall agreements — for work on or near shared walls with neighbours

A competent builder will discuss these requirements early and factor them into the timeline and cost. If your builder does not mention building regulations, that is a concern.

Finding Builders in South Yorkshire

South Yorkshire has a strong community of builders covering everything from small repairs to major construction projects. Whether you need a kitchen extension in Sheffield, a loft conversion in Doncaster, or a garage conversion in Barnsley, finding a verified local builder gives you confidence in the work.

Search for verified builders on RestoreTrade to find businesses that have been checked and confirmed as genuine.

List Your Building Business

If you are a builder in South Yorkshire or anywhere in the UK, list your business on RestoreTrade for free. Our verification process sets you apart from unvetted listings and helps customers find you with confidence.

FAQ

Do builders need a licence in the UK?

No. Unlike electricians (Part P) or gas engineers (Gas Safe), there is no legal requirement for builders to hold a licence. This makes voluntary accreditations like FMB membership, Checkatrade verification, and TrustMark registration especially important when choosing a builder.

How much deposit should I pay a builder?

A deposit of 10 to 15 percent is reasonable for most projects. This covers the cost of ordering materials and secures your start date. Be cautious of anyone asking for more than 20 to 25 percent upfront. The remaining payments should be tied to specific milestones in the project.

What should a builder’s quote include?

A proper written quote should include: a detailed scope of work, materials specification, start and completion dates, a payment schedule with milestones, details of who is responsible for waste removal, and any exclusions. It should also state whether VAT is included (builders with turnover above the VAT threshold must charge it).

How do I check if a builder is legitimate?

Search for their company on Companies House (if they are a limited company), check their FMB or TrustMark membership, ask for proof of insurance, and request references from recent clients. You can also search for verified builders on RestoreTrade, where every listing has been checked against official records.