Quote vs Estimate: the Difference, and Is a Quote Legally Binding?

↑ Part of the Quoting series · How to Quote a Job Properly

An estimate is a rough, informed guess at what a job will cost. A quote is a fixed price: once the customer accepts it, you're both held to it. Muddle the two and you either tie yourself to a number that doesn't cover the work, or hand a customer a figure they'll treat as final when you never meant it that way. Either way, the gap comes out of your pocket.

Most trades use the words like they mean the same thing. They don't, and the difference can cost you a few hundred quid on a small job or a few grand on a big one. It also decides something bigger: whether the number you gave is one you can be held to.

Part 1The £600 word

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A decorator prices up a three-bed repaint. Over the phone he says, "yeah, you're looking at about £1,800." Customer hears £1,800. Decorator meant "roughly, depending on what's under the old paint." Turns out two ceilings need sealing and a bedroom's been papered over woodchip, so the real job's nearer £2,400. He sends the bill. Customer points at the phone call and says, "you told me eighteen hundred." Now he's either eating £600 or having a row with someone who's about to leave him a one-star review.

Nobody wrote anything down. Nobody said the word "estimate" or the word "quote." And that vagueness is exactly where the money leaks out.

Part 2What's an estimate, exactly?

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An estimate is your best guess at the cost before you know everything. It's useful early on, when there are unknowns you can't price yet: what's behind the plaster, what the customer actually wants once they see options, how bad the existing wiring is. An estimate says "based on what I can see today, expect somewhere around this."

It is not a fixed price, and it shouldn't be treated as one by either side. The problem is that customers hear a number and the word "estimate" falls straight out of their head. So if you give one, the figure isn't the only thing that matters. How clearly you label it matters just as much.

Part 3What's a quote?

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A quote (or quotation) is a fixed price for a defined piece of work. You've looked at the job, you know the scope, and you're saying: this is what it costs, this is what's included. Once the customer accepts it, that price is the deal. You can't quietly bump it up because the job took longer than you'd hoped, and they can't knock money off because they've changed their mind about the colour.

That's the trade-off. A quote gives the customer certainty, which wins you work. It also pins you to a number, so the maths behind it has to be right before it leaves your phone. Price a quote light and you've signed up to lose money in writing.

Part 4Is a quote legally binding?

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Once a customer accepts your quote, you've generally formed a binding contract: you're committed to doing the work for that price, and they're committed to paying it. The binding point is acceptance, not the moment you send the quote, so a quote sitting unanswered isn't a contract. That's partly why a validity period ("valid for 30 days") is worth having: it stops an old price being accepted long after your costs have moved. An estimate, by contrast, is treated as a considered guess rather than a firm offer, so there's usually more give if the final figure lands higher.

(This is the general position in England and Wales; it can differ in Scotland and Northern Ireland, and none of it is legal advice. If a job's heading for a real dispute over money, that's one for a solicitor, Citizens Advice or Trading Standards, not a guide page.)

Can you increase a quote after it's accepted? As a rule, no, not on your own. The quoted price is the agreed price, and you can't quietly bump it because the job ran longer than you'd hoped. That's the risk you take on with a fixed quote, and it's why the maths underneath has to be right before you send it (pricing a job properly covers getting that number to actually cover the work). There are two legitimate ways the price moves up: a variation, where the customer agrees to extra work or a spec change that you price and record separately before doing it, or a genuine, obvious error, which is far more fact-specific and not something to bank on.

Can the customer refuse to pay, or knock money off? The binding street runs both ways. Just as you can't inflate an accepted quote, the customer generally can't decide to pay less than they agreed simply because they've changed their mind. What they can raise is the standard of the work: for consumer jobs the law expects the service to be carried out with reasonable care and skill, so genuine defects or unfinished work are a fair reason to hold money back until it's put right. That's different from quibbling the agreed figure.

Does it have to be in writing? No, a verbal agreement can be a binding contract too. The catch is proof. If it's your word against theirs about what was agreed, you may struggle to enforce it even when you're plainly in the right, and memories drift in the customer's favour when the bill arrives. "Binding" and "provable" aren't the same thing, so put quotes and variations in writing every time, even a text, because a deal you can't evidence is one you can lose the argument over.

Part 5The cooling-off right that catches trades out

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Here's one a lot of trades don't know about. When you agree a contract with a consumer in their own home, off your business premises, the customer usually has a 14-day cooling-off right under the Consumer Contracts Regulations 2013. If you start work inside that window without the customer's clear request to begin (in writing, or another form you can show later), you can find yourself on the back foot if they later cancel.

The bigger trap: you're required to tell the customer about their cancellation right. Miss that notice and the window doesn't stay at 14 days, it can stretch to as much as 12 months, and you can lose the right to be paid for work already done. The rules around the notice, the wording and starting early are specific, so if you do domestic work agreed in customers' homes, check exactly how they apply to you with Citizens Advice, Trading Standards or a solicitor. Getting it wrong can cost you the money on a job you've actually done.

Part 6What if there was an obvious mistake in the quote?

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If you've genuinely fat-fingered a figure, £1,400 typed as £1,040, the law sometimes doesn't hold a party to an obvious error, particularly where the other side knew or ought to have known it was a mistake. But this is properly fact-specific and not safe to rely on. A price that's merely lower than you'd like isn't an "obvious mistake," it's a bad quote you're likely stuck with.

Part 7So which should you give the customer?

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Quote when you can. A clear fixed quote is what wins jobs, because it's the thing a customer can actually compare and trust. It tells them you know the work well enough to put a number on it and stand behind it.

Estimate only when the unknowns are real and you can't price them honestly yet. A rewire on a house you haven't pulled a single socket off, say. In that case give the estimate, label it plainly as an estimate, and tell the customer what would turn it into a firm quote: "I'll give you a fixed price once I've had the floorboards up and seen the cabling."

What you want to avoid is the lazy middle, the phone-call number that's neither one thing nor the other. That's the version that costs you.

Part 8What happens when the job changes?

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This is where most of the real money goes, and it's got nothing to do with the original quote being wrong. A change to the agreed scope is a variation, and it needs pricing and recording the moment it comes up, before you do the work, not fought over at the end. Do the extra without recording it and you've worked for free: there's no paper trail, and the customer remembers the quote, not the favour. The full playbook, including how to raise it without the awkwardness, is in handling variations.

Part 9How to write a quote that actually protects you

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A quote that holds up has a few things in it that a scribbled number never does:

• A clear scope. What's included, and just as importantly what isn't. "Supply and fit" versus "fit only." Whether making good and rubbish clearance are in or out.
• The price, broken down enough to be trusted — labour, materials, VAT handled correctly. If you're CIS or working under the Domestic Reverse Charge, that needs to be right on the document, not worked out later. (Our VAT and CIS guide covers which applies to you.)
• Payment terms. Deposit, stages, final payment, how long they've got to pay. Vague terms are how a £4k final payment ends up 60 days late. (More on that in getting paid on time.)
• How long the quote's valid for. Material prices move. "Valid for 30 days" stops a customer accepting your March price in September.
• A line on variations, so changes get priced as they come up rather than fought over at the end.

Get those down on a proper document with your name on it, and the quote does a job long after you've sent it.

Part 10What actually decides a dispute?

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When it comes to it, evidence does. The quote document, what it said was included and excluded, the date it was accepted, and any variations the customer signed off. The trade with a clear written quote and a record of the changes is in a strong position; the one relying on memory and goodwill is gambling. That's the real reason the paperwork matters: being binding is only useful if you can prove what was agreed. For chasing money that's gone quiet once the work's done, see getting paid on time.

Common questionsQuote vs estimate: quick FAQ

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Is a quote legally binding once accepted?

Generally yes. Acceptance of a fixed quote usually forms a binding contract, committing you to the work at that price and the customer to paying it. The exact position depends on the facts.

Is an estimate legally binding?

Usually not as a fixed price, it's treated as a guide. You're still expected to do consumer work to a reasonable standard and charge a reasonable price, so "it was only an estimate" doesn't mean any final figure goes.

Can I charge more than my quote?

Not on your own. The agreed price stands, unless the customer agrees a variation for extra or changed work, or there was a genuine, obvious error, which is fact-specific.

Is a verbal quote binding?

It can be, but you'll struggle to prove the terms. A price you can't evidence is a price you'll lose the argument over, so put it in writing every time, even for small jobs.

Can a customer cancel after accepting?

Sometimes, particularly consumer contracts agreed in the home, which can carry a 14-day cooling-off right. The rules are specific, so check how they apply to your work before starting a job early.

Should I ever just give an estimate?

Yes, when the job has genuine unknowns you can't price honestly yet. Label it clearly as an estimate, never let it drift into being treated as a fixed price, and tell the customer what would turn it into a firm quote.

What's the quickest way to stop muddling the two?

Decide which one you're giving before you open your mouth. Fixed price you'll stand behind? That's a quote, write it down. Rough ballpark with unknowns? That's an estimate, say the word out loud.

This guide is general information for UK tradespeople, current to the best of our knowledge in 2026. Rules, rates and thresholds change, and how they apply depends on your specific circumstances. It is not tax, accounting or legal advice. Always confirm your position with HMRC, a qualified accountant or a solicitor before relying on it. TradeDraft accepts no liability for decisions made on the basis of this guide. Questions: hello@tradedraft.co.uk.

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