How to read a builder's quote, and the red flags to watch for

A good quote tells you exactly what will be done, with what materials, for what price, including VAT, and on what terms. If you cannot answer those four questions from the paper in front of you, it is not ready to sign. The price matters, but the detail is what protects you: most disputes over home improvement work start with something both sides assumed rather than wrote down.

Quote or estimate?

In everyday use the words get mixed up, but the difference matters:

• A quote is a fixed price for a defined job. If the job does not change, the price should not either.
• An estimate is an informed guess. The final bill can go up, and you have less to hold the tradesperson to.

Ask for a written quote. If some of the work genuinely cannot be priced until it is opened up, such as rotten joists under a bathroom floor, ask for those items to be listed separately with a rate (per day, per metre, per item) so the rest of the price is fixed.

What a good quote includes

Go through it line by line and check for:

1. The business details. Full name, trading address, phone number and, if they charge VAT, the VAT number. A mobile number and a first name is not enough.
2. A clear scope of work. What is being removed, what is being installed and where. "Refit bathroom" is not a scope; "remove bath, fit 1400 mm shower tray, tile walls to 2.2 m" is.
3. Materials named. Brands, models or at least grades: the tile size, the worktop material, the boiler or heat pump model, the insulation thickness. Otherwise two quotes are not comparable.
4. Who supplies what. Items you buy yourself (tiles, taps, appliances) should be listed as client supply so nobody is charged twice or missed.
5. VAT shown clearly. Our figures include 20% VAT. Installing heat pumps, insulation, solar panels and batteries is charged at 0% VAT until 31 March 2027, so those lines should show 0%. A tradesperson who is not VAT registered can quote less for labour, but the materials still carry VAT.
6. Waste and making good. Skip or waste removal, and making good plaster or decoration after the work, are common gaps.
7. Start date, duration and payment stages. When they start, how long it should take, and what you pay at each stage.
8. Certificates. Who provides them and at whose cost (see below).
9. Guarantees. What is guaranteed, for how long, and whether it is insurance-backed.
10. How changes are handled. Extras should be agreed in writing, with a price, before they are done.

Red flags

None of these proves a tradesperson is a cowboy, but each is worth a question:

• No written quote, or a price given only by text message with no scope.
• A large deposit before any work starts, especially when the materials are standard stock. Staged payments tied to finished work protect both sides.
• Cash only, or a discount for cash. It leaves you without a paper trail if anything goes wrong.
• Pressure to decide today, "this price is only valid this week" or offers because they are "working in the area".
• Vague lines such as "sundries" or "all necessary work" covering a large share of the price.
• No mention of certificates for electrical, gas or window work.
• A price far below the others with no clear reason. It often means something is missing from the scope and will come back as an extra.
• Reluctance to give references or show photos of similar finished jobs.

Certificates you should expect

Some work has to be certified, and a quote should say who arranges it:

• Electrical work. In England and Wales, notifiable electrical work must be done by a registered electrician (Part P) who self-certifies it, or notified to building control. Keep the certificate for when you sell.
• Windows. Replacement windows must meet building regulations. A FENSA or CERTASS registered installer can self-certify them.
• Heat pumps. The Boiler Upgrade Scheme, which takes £7,500 off an air source or ground source heat pump in England and Wales, requires an MCS certified installer.
• Gas work must be done by a registered gas engineer.

How to compare quotes

Get at least three quotes for the same job. Before comparing prices, make them comparable: same scope, same materials, same exclusions. Where one quote includes something the others leave out, add it to the others or strip it from the first.

Then check the total against what the job typically costs where you live. Our cost guides break each job into its parts, built from the labour hours for each trade multiplied by local rates, plus materials, and checked against market prices and real quotes. For example, a mid-range bathroom renovation typically costs £7,000 and a new mid-range kitchen without appliances £7,800. See the details in our Bathroom renovation, New kitchen and Replacement windows.

Check your quote in a minute

Our "Is my quote fair?" tool compares the price you were quoted with what homeowners in your area typically pay for the same job: Is my quote fair?. If your quote comes out above the usual range, it is not necessarily wrong. Ask the tradesperson what makes it different: a higher spec, a harder job or extras the others missed. A good one will be able to tell you.

Before you sign

• Read the payment terms and cancellation terms.
• Make sure the quote has a date and a validity period.
• Keep every document, message and change in writing.
• Check who holds public liability insurance and ask to see it.

A clear quote takes a little longer to write. A tradesperson who takes that time is usually the one who takes care over the job too.