Quote vs estimate: the difference, and when each is binding in the UK

Published November 2, 2026

A quote is a fixed price for defined work; an estimate is your best guess at what the work will cost. Once a customer accepts your quote, you usually have a binding contract, and you can't charge more just because your costs went up. An estimate usually isn't an offer at all, and if the final bill comes in higher, a consumer has to pay a reasonable price, not whatever you decide.

Checked against legislation.gov.uk, Citizens Advice and Trading Standards' Business Companion on 1 November 2026, for tradespeople in England and Wales. The Citizens Advice guidance quoted is its England version, with Scotland noted where Citizens Advice Scotland agrees. This is general information, not legal advice.

Key Takeaways

A quote is an offer. Once the customer clearly accepts it, it is likely to be a binding contract, written down or not.

After acceptance you can normally charge more only for extra work the customer agreed to pay for, or for an obvious mistake in the quote. Higher costs don't count.

An estimate isn't usually an offer. Where no price or pricing method was agreed, the Consumer Rights Act 2015 says a consumer pays a reasonable price and no more.

Whatever you say or write about the job can become a term of the contract, so label every figure for what it is.

Quote vs estimate at a glance

A ballpark, an estimate and a quote commit you to different things. The ballpark is the rough range you give on the phone or in a website chat before you know the job.

Question	Ballpark	Estimate	Quote
What it is	A rough range to tell someone if they're in budget	Your best guess at the cost	A fixed price for defined work
When to use it	First contact, before the details	When you can't define the work yet	When you can define the work
Is it an offer?	No, if it's labelled as a rough guide	Not usually	Yes, usually
If the work costs more	Your quote replaces it	Your stated method, or failing that a reasonable price	You absorb it, unless the customer agrees extra work
How long it holds	Until you quote	Until you quote or start	Until your "valid until" date
Label it	"Rough guide, not a quote"	"Estimate" and how the price will be worked out	"Quote", a number, a date and what's excluded

Is a quote legally binding?

Yes, once the customer accepts it. Trading Standards' Business Companion says a quotation for home improvement work "will usually involve an offer", and that once the customer accepts, "it is likely that you will have a legally binding contract".

Acceptance has to be clearly communicated, and a spoken yes counts: Business Companion says verbal acceptance takes place at the time of the conversation. Citizens Advice Scotland tells homeowners an accepted quote is "a binding agreement between you and the contractor, whether it's written down or not".

Two things end your offer before it binds you. A counter-offer ("can you do it for £2,000?") sets the original aside, and so does a reasonable time passing without acceptance. A "valid until" date sets that time for the customer, as Business Companion suggests.

Once accepted, the price holds. Citizens Advice tells homeowners in England that a trader can't charge more than the quote unless the trader told them extra work was needed and they agreed to pay more, or the price was obviously a mistake. It adds: "They can't charge you more if their costs have gone up since they did the quote." Citizens Advice Scotland's list is similar: extra work the customer asks for or agrees to pay for, or a genuine mistake in calculating the price.

The words around the price bind you too. Under section 50 of the Consumer Rights Act 2015, anything you say or write to a consumer about the service becomes a term of the contract if they take it into account when deciding to go ahead. "Three days on site" and "includes making good" are promises once the customer relies on them.

When is an estimate binding?

An estimate isn't usually an offer. Business Companion says that is "because it will be based on incomplete information". But when the customer tells you to go ahead, you have a contract to do the work. What's left open is the price.

Section 51 of the Consumer Rights Act fills that gap. Where the contract doesn't fix a price and doesn't say how the price is to be fixed, the consumer must pay "a reasonable price for the service, and no more". What counts as reasonable is a question of fact. Citizens Advice tells customers to weigh the estimate, any changes and why they happened, and events outside your control such as bad weather or rising material costs. On car repairs, it puts it simply: with only an estimate, the trader "can charge you more within reason".

Two details in the Act help you write an estimate that holds up:

Say how the price will be worked out. Section 51 applies only where the contract doesn't say how the price is fixed. An estimate that states its method, such as "£275 a day for the days on site, plus materials at cost", gives the customer a method to check your bill against.
Label the figure on the same occasion. Section 50 makes what you say a term, subject to anything that qualified it and was said or written on the same occasion. Write "estimate" next to the number, in the same message.

What you must tell a consumer about price

For most jobs, the Consumer Contracts Regulations 2013 require you to give a consumer the total price including taxes before they're bound. Where the price can't reasonably be calculated in advance, you give the way it will be calculated instead.

Agreed face to face at your premises: Schedule 1, paragraph (c). A day-to-day transaction carried out there and then is exempt (regulation 9).
Agreed in the customer's home, by phone or online: Schedule 2, paragraph (f). Jobs agreed in the customer's home where they pay £42 or less are outside these rules (regulation 7).
Excluded: among others, a contract to the extent that it is for the construction of new buildings, or of substantially new buildings by converting existing ones (regulation 6). Ordinary repairs and refits to an existing home aren't named in that exclusion.

Section 50 of the Consumer Rights Act then treats that information as a term of the contract, and a change to it isn't effective unless you and the customer expressly agree it. So give a consumer either a total price including VAT (a quote) or a clear method (an estimate). Don't give a figure with no label.

What to do when costs change

Your options depend on whether the customer has accepted.

Before they accept: send a revised quote with a new number and date. The old one is replaced.
After the "valid until" date: the offer has lapsed, so re-price before you start.
After they accept: hold the price for the work you quoted. If the job needs more, stop, explain what you found, price it, and get the customer's agreement in writing (an email or text reply is fine) before you do the extra work. That is the "extra work agreed" exception Citizens Advice describes.

Don't rely on a clause that lets you raise the price at will. The Consumer Rights Act lists a term "permitting a trader to increase the price" without giving the consumer the right to cancel as one that may be regarded as unfair (Schedule 2, paragraph 15; section 63).

A safer way to cover the unknowns is to split the job. Quote a fixed price for what you can see. Name what you can't see as an exclusion with a method attached, or as a provisional sum: an allowance shown as its own line, replaced by the actual cost once the work is known. Jobs with hidden work behind them, such as quoting building work, are where this split earns its keep.

How to word each one

Copy and adapt these, keeping the label in the same message as the figure.

Ballpark (phone, chat or email):

Bathroom refits like this usually come in between £2,880 and £3,840 including VAT. That's a rough guide, not a quote. I'll send an itemised quote once I've seen the room.

Estimate:

Estimate, not a fixed price. Clearing and repairing the guttering on the rear extension: we expect about 2 days at £275 a day, plus materials at cost: around £840 including VAT (£700 plus VAT at 20%). The final price will be worked out at that day rate for the days on site. We'll tell you before we go more than 20% over this figure.

Quote:

Quote Q-1042, dated 1 November 2026, valid until 1 December 2026. Fixed price for the work described above: £2,645.00 plus VAT at 20%, £3,174.00 in total. Not included: hidden pipework repairs found when the old suite comes out, which we'll price separately before work continues.

Variation (after acceptance):

Change to quote Q-1042: the pipework behind the old bath is corroded and needs replacing, which the quote excluded. Extra cost £360.00 plus VAT (£432.00). New total £3,606.00. Please reply "agreed" before we carry on.

For the steps that come before any of these, see how to quote a job, and for the full document, the free job quote template.

Worked example: from a website ballpark to an accepted quote

We make ChatQuote, AI quoting software for UK trades and agencies, and its flow separates the ballpark from the quote in the way this guide describes. The figures below are illustrative and the business is fictional.

The ballpark. A homeowner asks about a bathroom refit on a fitter's website at 9pm, and the assistant asks the questions the fitter would ask. If the fitter has switched ballparks on and their own rates and past quotes support a figure, it gives a range labelled as a rough, non-binding guide, saying the itemised quote will follow. Otherwise it gives no figure at all.
The quote. ChatQuote drafts an itemised quote from the fitter's prices: labour at £275 a day, materials and skip hire, £2,645 plus VAT at 20%, £3,174 in total, with assumptions, exclusions and a "valid until" date. By default the fitter reviews it before it is sent. Once sent, it is an offer.
Acceptance. The customer accepts on the proposal page by typing their name. ChatQuote records it but doesn't present it as a legal signature; like an email saying "yes, go ahead", it is a clear record of acceptance. A consumer who agrees a job online can usually cancel within 14 days, so give the cancellation information set out in the quote template guide's rules section.
The variation. If the pipework behind the old bath turns out to be corroded, the quote's exclusion covers it: the fitter prices the extra work and gets a written "agreed" first.

Whether a chatbot should show prices at all is a separate choice; should your website chatbot give prices weighs it up.

Frequently asked questions

Is a verbal quote binding?

It can be. Acceptance can be spoken, and Citizens Advice Scotland says an accepted quote binds "whether it's written down or not". A verbal quote is just hard to prove, so put every quote in writing.

How long should a quote be valid for?

There's no legal minimum. Business Companion suggests a time frame long enough for the customer to consider the offer carefully; the example in our quote template uses 30 days. After the date passes, re-price before you start.

Can I charge more than my estimate?

Yes, within reason. If the contract fixes no price and says no method for working it out, a consumer pays a reasonable price and no more (section 51). If you stated a method, such as a day rate plus materials, the method sets the bill.

Should a quote include VAT?

For a consumer, yes: the 2013 regulations require the total price inclusive of taxes. If you're VAT registered, show the subtotal, VAT and total. If you're not, write "Not VAT registered".

Do the same rules apply to business customers?

Not the Consumer Rights Act rules. They protect a consumer, meaning an individual acting wholly or mainly outside their trade (section 2). For a business customer in England, Wales or Northern Ireland where no price was agreed, the Supply of Goods and Services Act 1982, section 15 implies a reasonable charge instead. Quote, accept and vary the same way.

Your next step

If you can define the work, send a quote with a "valid until" date and clear exclusions, starting from the free job quote template. If you can't, send an estimate that says how the final price will be worked out. Either way, agree changes in writing before doing extra work.

If you'd rather your website handled the ballpark and drafted the quote, ChatQuote has a 30-day free trial, and no card is needed.

About this guide

Written by the ChatQuote team at CodeLeap Ltd, the company that makes ChatQuote. The Consumer Rights Act 2015 applies across the UK (section 99); the law described is for England and Wales; the Citizens Advice pages cited are its England and, where named, Scotland versions, and Business Companion covers England, Scotland and Wales. Scots contract law and Northern Ireland guidance aren't covered in detail. Checked on 1 November 2026. General information, not legal advice; for a dispute, speak to a solicitor or Citizens Advice. More guides to quoting and pricing. Spotted something out of date? Email support@chatquote.app.