Quotation vs Estimate: What's the Difference?

Most homeowners use the words "quote" and "estimate" as if they mean the same thing. Builders often do too. But when a dispute over the final bill arrives, the difference between the two decides who pays.

If the document in your inbox does not say clearly which it is, you are already exposed. This guide explains the distinction in plain English, shows you what to look for, and tells you what to ask before you accept anything.

Common mistakes

Assuming the headline figure is fixed. A number on a letterhead is not a fixed price unless the document says so. An estimate can rise without the contractor breaching anything.

Treating a detailed document as a quotation. Length is not the same as commitment. A four-page estimate is still an estimate.

Ignoring the wording around the total. Phrases such as "approximately", "based on our initial visit", "subject to survey" or "provisional" signal a price that is expected to move.

Not checking what triggers an increase. A good quotation lists the conditions under which the price can change. A weak one leaves it open.

Accepting verbally. A price agreed on the doorstep is very hard to enforce later. Get it in writing before work starts.

Real examples

Illustrative only — these are hypothetical figures, not market averages.

A homeowner receives a document headed "Estimate" for a bathroom refit at £6,800. Halfway through, the contractor finds rotten floor joists and the final invoice is £8,950. Because the document was an estimate and the joists were never inspected, the extra is chargeable.

A second homeowner receives a "Fixed price quotation" at £7,400 for the same scope, with a line stating that hidden structural defects would be priced separately as a variation. The joists are found. Only the joist work is extra — the rest of the price holds.

A third receives a quotation with no VAT line at £9,000. The contractor is VAT registered, so £1,800 lands on the final invoice. The price was never wrong — it was just incomplete.

What to do instead

1. Find the heading. Look for the words "Quotation", "Estimate", or "Fixed price" at the top of the document. If none appear, ask for it in writing.
2. Check the VAT position. The document should state whether the figure includes VAT and give the contractor's VAT number if registered.
3. Read the change clause. Identify exactly what allows the price to move and who authorises it.
4. Look for exclusions. Anything listed as excluded is money you will spend elsewhere.
5. Ask for the estimate to be converted. Once the scope is settled, a competent contractor can usually issue a firm quotation.

When an estimate is reasonable

Estimates are not a red flag on their own. Where the work depends on what is found once floors, walls or ground are opened up, no honest contractor can commit to a final figure in advance. Damp remediation, roof structure repairs and drainage work all fall into this category.

What matters is whether the uncertainty is named. A fair estimate says which elements are uncertain and how they will be priced. An unfair one presents a soft number as though it were firm.

What a firm quotation should contain

A quotation you can rely on will normally set out the scope of works item by item, the total price and the VAT treatment, what is expressly excluded, the payment schedule, the programme or expected duration, the warranty or guarantee position, and the process for agreeing variations. Missing any of these does not make the quotation invalid — but each gap is a place where the final cost can move without warning.

Frequently asked questions

Before you sign

If you are unsure which one you have, you do not have to work it out alone. Upload the document for a free Quote Health Check and we will show you how it is framed, what is missing, and the questions worth asking before you commit. If you have more than one price on the table, you can compare two quotations side by side, or read our other guides first.

You can also learn more about how we review quotations or get in touch if you would like a hand.