Quote vs. estimate — know the difference
A quote is a fixed price: if accepted by the customer, you're committed to doing the work for that price (subject to any variation clause). An estimate is indicative — the final price can differ based on actual costs. Always be clear which you're providing.
For defined scope jobs (bathroom refits, new fencing, groundworks to a known spec), a quote is appropriate. For complex renovations where scope might change significantly, a structured estimate with a clear variation clause protects both sides.
What to include in every builder's quote
A professional builder's quote should cover all of the following:
- •Your company name, address, and VAT number if registered
- •Client name and site address
- •Date of the quote and validity period (30 days is standard)
- •Project description — specific, not vague. Not 'extension' but 'demolish existing lean-to approx 3m x 4m, excavate and pour concrete raft foundation to building regs spec, erect timber frame...'
- •Materials breakdown: list the main items with approximate costs
- •Labour: fixed price or day rate with estimated days
- •Exclusions — state what is NOT included
- •Payment schedule: deposit, stage payments, final balance
- •VAT breakdown if registered
The variation clause — your most important protection
This is the single most valuable clause in a builder's quote. Without it, every scope change is a potential dispute. Your variation clause should state something like: 'Any work not described above, or changes to specification requested by the client, will be charged as a variation at a day rate of £[X]. All variations must be agreed in writing before work commences.'
When a variation arises, send a quick written note (even a WhatsApp message with a confirmed price) before doing the extra work. This conversation, dated and agreed by the client, is your protection.
Payment schedule for builders
For jobs over £3,000–£5,000, never rely on a single payment at the end. Stage payments protect you if a client delays, runs short of funds, or disputes progress. A typical structure:
- •20–25% deposit on acceptance of quote
- •40% at completion of first major stage (e.g. structure up and watertight)
- •35% on practical completion
The exclusions list
If you don't specify what's excluded, clients assume it's included. Common exclusions worth calling out explicitly:
- •Electrical first and second fix (by others unless otherwise agreed)
- •Plumbing and heating works
- •Skip hire and waste disposal (or state it is included)
- •Structural engineer or building control fees
- •Permit or planning fees
- •Furniture removal and protection
The Construction Act 1996 and your right to stage payments
The Housing Grants, Construction and Regeneration Act 1996 (the Construction Act) gives every UK construction contractor a statutory right to interim payments on contracts expected to last more than 45 days. This applies whether the customer is a homeowner or a main contractor.
A compliant payment mechanism must provide: (1) an adequate means of determining what payments become due and when; (2) a final date for payment; (3) a requirement for the paying party to issue a payment notice within 5 days of the due date; (4) a pay-less notice mechanism; and (5) your right to suspend work for non-payment on 7 days' written notice.
If your contract is silent on payment, the Scheme for Construction Contracts (England and Wales) Regulations 1998 fills the gap — stage payments every 28 days, final date 17 days after the due date, 5-day window for payment notices. It runs automatically unless you've contracted otherwise.
Consumer Rights Act 2015 — quote or estimate?
For builders, the CRA 2015 distinction between quote and estimate is the most important legal decision you'll make on every job. A quote is a fixed offer — once accepted by the customer (by signature, email, or authorising work to start), you're contractually held to that price.
An estimate is governed by section 51 — the final price must be 'reasonable'. Courts typically accept the original estimate plus 10-15% without argument. Above that you need evidence of genuine cost increases and timely written notification to the customer when costs escalated.
For extensions and structural work, use an estimate and state in writing: 'This is an estimate based on visible scope. If groundworks uncover unforeseen conditions (tree roots, buried services, non-compliant foundations), we will pause work and issue a revised estimate in writing before continuing.' That single sentence is worth thousands when the ground doesn't co-operate.
CIS implications if you're subbing for another builder
If you're raising the quote for a main contractor (not a homeowner), the Construction Industry Scheme applies. Your invoice must split labour from materials — CIS is deducted from labour only. Standard CIS deduction is 20% for registered subcontractors, 30% if you haven't registered with HMRC for CIS.
VAT treatment is also different on B2B construction work. If you and the main contractor are both VAT-registered and CIS-registered, and they are not the end user of the building, the domestic reverse charge applies (VAT Notice 735) — you show £0 VAT on the invoice with a 'reverse charge — customer to account for VAT' statement. Charging VAT when reverse charge applies gets your invoice rejected; applying reverse charge to an end-user customer leaves thousands of VAT off the bill.
14-day cancellation rights for domestic customers
If you sign up a homeowner in their own home, the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013 give them 14 days to cancel without reason. You must provide written notice of this right — failing to do so extends the cancellation window to 12 months and can invalidate your claim for work done.
If the customer asks you to start inside the 14-day window (normal for small repairs), they must sign an express request acknowledging they'll pay for work done to the cancellation date. Include the notice and the express request form on every domestic quote, not just the first one. The absence of this paragraph is the most common reason builders lose deposit retention cases.
Speed matters
The builder who sends a detailed, professional quote the same day or next morning wins a disproportionate share of jobs. Homeowners are anxious about finding reliable tradespeople. Speed signals reliability as much as the document itself does.
TradeDoc AI generates a fully formatted builder's quote — project description, materials, labour, payment terms, exclusions, variation clause, Construction Act stage schedule, and 14-day cancellation notice — in about two minutes. Try it free for 7 days, no card required.
