Fixed quote or estimate? Decide before you price
On a build, the difference between a quote and an estimate is money. A fixed quote is a firm price for a clearly defined scope — you carry the risk if your take-off was light. An estimate is a considered guess for work you cannot fully see yet (a renovation where you do not know what is behind the plaster), and the final figure can move. An estimate is usually indicative rather than a fixed price, but local consumer law or the contract may limit how far the final price can move — label it clearly and state what could change the price.
Pick the right one and label it plainly. Quoting a fixed price on a job full of unknowns is how contractors lose a margin; calling a firm price an "estimate" invites the client to haggle later.
Itemise materials, labour, plant — and your allowances
A vague construction quote ("Build single-storey extension — £42,000") is a dispute waiting to happen. Break it down so the client can see what they are buying and you can defend each number:
- Labour — by trade and hours or by stage (groundworks, frame, first fix, second fix, finishes).
- Materials — itemised or grouped, with a note on whether prices are held or subject to supplier movement.
- Plant and access — excavator hire, scaffolding, skips, by day or week.
- Allowances (PC and provisional sums) — a stated budget for items not yet chosen, e.g. "Kitchen units: £6,000 allowance (provisional)". If the client picks pricier units, the allowance flexes and that is a change, not a surprise.
Allowances are the construction-specific trick that keeps a fixed quote honest: you commit to a price for everything you can pin down, and ring-fence the rest as a clearly labelled budget line.
Validity, deposits, retention, and change orders
Put a validity period on it. Timber, steel, and copper prices move, so 14 to 30 days is sensible — after that you reserve the right to re-quote. Say so on the document.
Deposits are common for many B2B or construction projects. For consumer or home-improvement work, deposit caps and refund rules may apply depending on your jurisdiction; keep any cancellation fee tied to work done or direct loss and state the refund rule clearly. The client may also hold retention (commonly around 5%) until practical completion — note whether your quoted price is before or after retention.
Write the change-order rule into the quote: "Variations to the agreed scope will be priced in a written change order and approved — signed where local law or the contract requires — before the work proceeds." That sentence is what stops scope creep from eating your profit.
Acceptance and signatures
A quote usually works as a commercial offer; if the client accepts it and the essential terms are clear, it will usually form the agreed price and scope, subject to local contract and consumer-law rules. Until acceptance, either side can walk away.
An e-signature or typed approval is usually enough for ordinary commercial jobs, provided local law and the contract do not require a specific form, witness, or wet-ink signature. Keep a dated record of the acceptance. On a construction project, the acceptance usually references a contract or schedule of values, and a signed quote may need to be paired with a formal contract depending on the project's value and local licensing rules.
From accepted quote to invoice
Once the stage or project reaches completion, use the accepted quote as the basis for a separate invoice or tax invoice. For deposits, progress payments, or retainers, issue the required invoice and account for VAT/GST/HST/sales tax under local timing rules. Reference the original quote number on the invoice — it helps the client's accounts team match the bill to what they approved.
The practical switch is small: change the heading from "Quote" to "Invoice", swap "Valid Until" for a payment due date, add a fresh invoice number, and apply your tax treatment. Our free invoice generator produces the matching invoice.
Tax on a quote
A quote can show estimated tax (VAT, GST, HST, or sales tax) so the client sees the likely total, but it is a commercial offer, not a tax invoice or sales-tax document — it does not by itself create a reporting point. If you display tax, mark it as estimated or indicative so it is not mistaken for a tax invoice.
Rates and thresholds differ by country and can change, and deposits or advance payments can affect when tax is due — confirm the treatment that applies to your work with your tax authority or an accountant.