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How to Check if a Builder’s Quote is Fair (UK Guide)
Understand the detail behind the price — and the questions to ask before you commit.
You’ve walked a builder through your project. A few days later, a PDF lands in your inbox. You scroll past the logo and stop at one line: Total: £18,500.
Your immediate thought might be: Is this fair? What am I actually paying for?
Comparing prices can be difficult when one quote contains three pages of detail and another simply says “labour and materials included”. The total alone won’t tell you which offers better value.
Clearly Built provides neutral, independent guidance to help homeowners understand their options. Here’s how to examine a builder’s quote before committing to the work.
1. Look beyond the headline price
A polished PDF is not proof of good workmanship, and a short message is not proof of dishonesty. What matters is a clear written description of what you’re buying. A lump sum can be perfectly reasonable when it is backed by a detailed scope and specification.
If all you have is a total, ask for more detail before accepting. Look for:
- The business details: who is doing the work and how to contact them.
- The scope: dimensions, preparation, materials, finishes and the work included at each stage.
- A useful cost breakdown: labour and materials, or clearly priced work packages, so you can understand the main costs.
- VAT and validity: whether VAT is included where applicable and how long the price stands.
- Changes: how extra work will be priced and approved before it goes ahead.
Also ask whether the document is a quotation for an agreed scope or an estimate that may change. The wording and agreed terms matter.
2. Check what’s excluded
The cheapest quote on paper may leave you paying separately for work another builder has included. Ask for exclusions and responsibilities to be set out clearly.
- Waste and skips: who pays for removal, permits and disposal?
- Making good: are plastering, painting, skirting boards and repairs to disturbed areas included?
- Access and temporary works: what is allowed for scaffolding, supports, protection and equipment?
- Approvals and specialist input: who arranges and pays for drawings, engineering, inspections or other required approvals?
- Site conditions: how will unexpected ground conditions or hidden defects be handled?
Example: Builder A is £2,000 cheaper, but excludes waste removal and finishing. You need prices for those items before you can make a meaningful comparison. It doesn’t automatically make either builder better value.
3. Understand PC sums and provisional sums
Allowances are normal when choices or details are still being settled. They are not necessarily final prices, and these two terms mean different things:
- PC (Prime Cost) sum: an allowance for an item not yet selected, such as tiles or sanitaryware. Check whether installation, delivery, VAT and the builder’s charges are separate.
- Provisional sum: an allowance for work whose scope or cost is not yet fully defined — for example, drainage work that needs further investigation.
Always check how your particular quote or contract defines the allowance. Ask what it covers, what it excludes, and how the final adjustment will be calculated.
If a quote allows £1,000 for selected items but your chosen products cost £1,600 on the same basis, the product difference is £600. Delivery, installation changes or an agreed mark-up could add more. Price your preferred specification before you commit.
The more unresolved allowances there are, the less certain your final budget is. Ask which can be turned into firm prices now.
4. Agree sensible payment terms
A deposit request deserves an explanation. Keep upfront payments as low as practical, understand exactly what they fund and get receipts. A percentage alone cannot tell you whether the arrangement is reasonable.
Bespoke products or significant material orders can require money in advance. Ask for evidence of the order, the cancellation terms, what protection applies and what happens if the business cannot complete the job.
For later payments, agree clearly defined milestones and how completion will be checked. A schedule might cover:
- An agreed initial payment, with its purpose recorded.
- Payments after specified stages of work have been completed and checked.
- A final payment linked to the completion requirements in your contract.
The amounts should reflect your project. Avoid a schedule that leaves you paying far ahead of the work delivered. If a retention for defects is proposed, agree its amount, purpose and release conditions before signing; don’t assume you can withhold money later.
Pressure to pay immediately, unclear paperwork or a refusal to explain a large advance payment are reasons to pause and seek advice.
5. Compare the same job — not just the totals
Give each builder the same drawings, dimensions, specification and list of requirements. Put their responses side by side and mark anything that differs: materials, preparation, exclusions, allowances, VAT, timescales and payment terms.
Ask about significant price differences. Access, labour, equipment, overheads, quality and risk can all affect a price. A higher figure isn’t automatically unfair, and a low figure isn’t automatically a bargain.
Check relevant experience, recent work, references and appropriate insurance too. A fair price needs to be considered alongside the builder’s ability to deliver the agreed job.
Before you say yes
Can you explain what is included, what could change, and when you will pay? If not, ask for clarification. Clarity before commitment is more useful than chasing the lowest number.
Further reading: Citizens Advice — arranging building work (choose your UK nation) and Federation of Master Builders — pricing and scope of work.
DON’T COMMIT WHILE YOU’RE UNSURE
Got a quote? Get clarity before you say yes.
Clearly Built can review the scope, highlight unclear allowances and missing details, and help you ask your builder the right questions. Get an independent perspective before making an expensive decision.
Start with a free 20-minute conversation. Tell us about the project and what concerns you. We’ll explain the support available and any review fee before you commit.