What should a builder's quote include?
Enough detail that you could give it to a different builder and get a comparable price — if you cannot, it is an estimate dressed as a quote, and that ambiguity is where disputes originate.
What a proper quote contains:
A description of the work, room by room or element by element, specific enough to price.
Specifications and allowances. Which materials, which brands or standards, and where a provisional sum or allowance has been included because the choice has not been made — with the amount stated, so you know the price will change when you choose.
Exclusions, explicitly. What is not included is more informative than what is. Common exclusions: making good and decoration, scaffolding, skips and waste removal, structural calculations, building control fees, asbestos survey and removal, and connection or diversion of services.
A price, marked as fixed, with VAT stated separately and clearly where applicable.
Payment schedule tied to stages of completion rather than dates — and never a large payment upfront. A deposit for materials is normal; half the money before work starts is not.
Programme, with start date and duration.
Who is responsible for permissions, inspections and party wall matters.
Insurance and qualifications — public liability, and registration for any gas, electrical or building control notification.
What happens on variation, which is the single most valuable clause. Changes should be priced and agreed in writing before being carried out, which prevents the familiar situation of a final invoice containing items nobody remembers approving.
How to use it: get three quotes on the same written specification, so you are comparing like with like — differing scopes are why quotes vary wildly. Query the cheapest rather than assuming it is a bargain, since it usually means something has been excluded.
Before signing: check references and see completed work; verify the company exists and how long it has traded; and for larger projects consider a written contract rather than a quote alone.
Retention of a small percentage until defects are resolved is normal practice on larger jobs.