For homeowners · Building & extensions
What a builder's quote should include
On building work, the argument is almost never about the number at the bottom. It is about what that number was supposed to cover. A good quote removes the ambiguity before anyone starts.
The checklist
- The trading name, address and contact details of the business, and its company number if it is a limited company.
- A written scope describing each element of work in order, not a single line saying 'build extension'.
- Explicit exclusions — decoration, flooring, kitchen supply and fit, landscaping, making good to existing rooms.
- Who supplies materials, and a provisional sum for anything not yet chosen such as tiles, sanitaryware or worktops.
- Scaffolding, skips, waste removal, temporary protection and site welfare — priced or clearly excluded.
- Building control fees, structural calculations and any party wall costs, with responsibility named.
- A programme with a realistic start date and duration in weeks.
- A stage payment schedule tied to visible milestones, plus any retention.
- How variations are priced and confirmed, in writing, before they are carried out.
- Guarantees on workmanship, plus manufacturer warranties on products, with durations.
- Whether the price is fixed, and what would make it change.
- VAT — shown separately, or a statement that the business is not VAT registered.
Provisional sums and prime cost items
A provisional sum is an allowance for work that cannot be priced accurately yet. It is legitimate, but each one is a place where the final figure can move. Ask what the allowance assumes, and get the real price confirmed before that element starts.
Warning signs
- A single-page quote with one total and no breakdown.
- A large cash deposit requested before any materials are ordered.
- Pressure to decide today because the price is 'only good this week'.
- No written exclusions at all — everything is 'we'll sort it as we go'.
- Bank details in a different name from the business you are hiring.
Quote or estimate?
A quote is a fixed price for a defined scope. An estimate is an informed guess that can move. Both are legitimate on building work, but you need to know which you have been given — ask for the word to be written on the document.
Frequently asked questions
- Is a builder's quote legally binding?
- A quote accepted by you forms a contract for that scope at that price. Extras outside the agreed scope are chargeable, which is why written variations matter.
- What is a fair deposit for building work?
- Enough to cover materials being ordered up front. If the request is a large percentage of the whole job before work starts, ask what specifically it buys.
Get comparable quotes by giving every builder the same written scope.
Related on Find A Trade Local
Sources and further reading
This guide is general information for UK readers and is not legal, tax or financial advice. Where a decision depends on your circumstances, speak to a suitably qualified professional.
