Questions to Ask a Builder Before Hiring
A good builder welcomes questions — evasiveness is itself an answer. Before you hand over a deposit or sign anything, a short conversation tells you most of what you need to know about whether someone is the right fit for your project.
Before hiring a builder, ask about their insurance, recent references, written quote, payment schedule, timeline, who will actually do the work, and what guarantee you get in writing. Below are 15 questions to ask, with why each one matters and what a good answer sounds like, so you can listen for the right things rather than just ticking boxes.
The 15 questions to ask
1. Are you insured, and can I see your public liability certificate?
Why it matters: Public liability insurance protects you if the builder’s work damages your property or injures someone. Without it, you could be left footing the bill.
A good answer sounds like: “Yes, here is my certificate” — produced without fuss, current, and with a sensible level of cover for the size of your job.
2. Can you give me references from recent, similar jobs?
Why it matters: Past customers are your best guide to what the builder is actually like to work with — on timekeeping, tidiness and problem-solving.
A good answer sounds like: Two or three contactable references for jobs like yours, offered willingly. Then actually call them and ask whether the work finished on time and on budget.
3. Can I see examples of completed work?
Why it matters: Photos, or better still a finished job you can visit, show the quality you can expect rather than just promises.
A good answer sounds like: A portfolio of relevant projects, ideally including work similar in scale to yours. Vague claims with nothing to show are a warning sign.
4. Will you provide a detailed written quote, not just an estimate?
Why it matters: A written quote is a commitment you can hold the builder to; a casual verbal estimate is not. This is your single most important piece of paperwork.
A good answer sounds like: “I’ll put a full written quote together for you” — itemised and fixed, rather than a round number scribbled on the spot.
5. What’s included — and what could cost extra?
Why it matters: The gap between quotes is often hidden in what each one leaves out. Knowing the exclusions upfront prevents nasty surprises mid-job.
A good answer sounds like: A clear breakdown of what is covered (labour, materials, waste removal, VAT) and an honest explanation of what might add cost, such as unforeseen structural issues.
6. What’s the payment schedule, and how much deposit do you need?
Why it matters: Payment tied to completed stages protects you. A large sum demanded upfront is one of the clearest red flags there is.
A good answer sounds like: A modest deposit for initial materials, with the balance paid in stages as agreed milestones are completed — all set out in writing.
7. When can you start, and how long will it take?
Why it matters: A realistic timeline helps you plan and reveals whether the builder is genuinely available or stretching themselves across too many jobs.
A good answer sounds like: A clear start date and a realistic duration, with a frank note about anything that could affect it, such as weather or material lead times.
8. Who will actually do the work — you, employees or subcontractors?
Why it matters: The person quoting is not always the person on site. It is fair to know who will be in your home and who is responsible for the quality.
A good answer sounds like: A straight answer about their team or any subcontractors, who supervises them, and who remains accountable for the finished work.
9. Do you have the right accreditations for this job?
Why it matters: Work that touches regulated trades must be done by someone properly registered — this is about safety and legal compliance, not just quality.
A good answer sounds like: Confirmation of the relevant scheme and a registration number you can check — Gas Safe for any gas work, Part P competence (for example via NICEIC or NAPIT) for electrics, and quality schemes such as TrustMark or the FMB. We are not these bodies; we simply check that the tradespeople we list hold the registrations their work requires.
10. Will you handle building control and planning sign-off where needed?
Why it matters: Many bigger jobs need building regulations approval or planning permission. Skipping it can cause problems when you come to sell.
A good answer sounds like: A clear explanation of what approvals your job needs and confirmation of who arranges and pays for them — ideally the builder, on your behalf.
11. What guarantee or warranty do you offer, and is it in writing?
Why it matters: A guarantee is only worth as much as the paper it is written on. A verbal promise is very hard to enforce if something fails later.
A good answer sounds like: A stated workmanship guarantee period, provided in writing, with a clear explanation of what it covers and how you would make a claim.
12. How will you handle changes or unexpected problems mid-job?
Why it matters: Almost every project hits a surprise. How a builder deals with it — and prices it — separates the professionals from the rest.
A good answer sounds like: A simple process for agreeing any change in writing, with a cost, before the extra work goes ahead — never a verbal “we’ll sort it out later”.
13. Who’s my point of contact day to day?
Why it matters: On a job of any size, you need to know who to speak to when you have a question or a concern.
A good answer sounds like: A named person and a reliable way to reach them, with a sense of how often you will get updates.
14. How will you protect the site and clean up?
Why it matters: Building work is messy. A builder who plans for dust protection, waste and a tidy finish is one who respects your home.
A good answer sounds like: A practical plan for protecting floors and furniture, removing waste, and leaving the site clean — and clarity on whether skip hire is included.
15. What happens if I’m not happy with something?
Why it matters: Knowing how complaints are handled before you start gives you confidence and a route to resolution if standards slip.
A good answer sounds like: A calm, clear explanation of how they would put things right, backed by the written guarantee — not defensiveness at the question being asked.
Red flags in the answers
The way a builder answers matters as much as the answers themselves. Be cautious if you hear or see:
- Cash-only, with no written quote or invoice offered.
- No detailed written quote — only a vague verbal figure.
- Evasiveness about insurance or an unwillingness to show a certificate.
- A large deposit demanded upfront before any work begins.
- Pressure to sign today or to decide on the spot.
One of these warrants a closer look. Several together, and you are almost always better off choosing someone else.
Before you sign — get it in writing and compare quotes
Notice how often “in writing” appears above. Your quote, payment schedule, guarantee and any mid-job changes should all be written down — it protects both you and the builder, and it prevents honest misunderstandings.
Asking these questions is really the final step of vetting a tradesperson properly. If you want the full picture, our guide on how to find a tradesman you can trust covers the identity, insurance and accreditation checks to run first, and our explainer on how to read builder reviews shows how to judge the feedback you find.
Finally, do not rely on a single quote. Get at least three written quotes for the same scope of work so you can compare fairly and spot anything unusually high or low. That is free with Trusted Tradesmen Quotes: tell us the job once and receive up to five no-obligation quotes from vetted local tradespeople. When you are ready, you can compare local builders near you in a couple of minutes.
Frequently asked questions
What questions should I ask a builder before accepting their quote?
Confirm the quote is detailed and in writing, ask what is included and what could cost extra, check the payment schedule and deposit, the start date and timeline, who will do the work, their insurance and accreditations, and what guarantee you get in writing. Together these tell you whether the quote is solid and the builder is reliable.
How do I know if a builder is reputable?
A reputable builder gives a written quote, shows public liability insurance, provides recent references you can call, holds any required accreditations, and is comfortable answering questions about the work and the guarantee. Willingness to be checked is one of the strongest signals of all.
How much deposit should I pay a builder?
A modest deposit to cover initial materials can be normal, but be cautious of large upfront sums. Tie payments to completed stages of the work and keep the whole schedule in writing, so money is only released as progress is made.
Should I get more than one builder’s quote?
Yes — get at least three written quotes for the same scope so you can compare fairly and spot anything unusually high or low. It is free to compare quotes with Trusted Tradesmen Quotes, which connects you with up to five vetted local tradespeople from a single enquiry.