Quote vs Estimate: The One Word That Can Cost You Thousands
Here's a small word that has cost tradespeople a lot of money: quote.
Most people on the tools use "quote" and "estimate" as if they mean the same thing. They don't. One is a fixed price you're legally bound to. The other is a rough figure you can revise. Write the wrong one at the top of a job that turns out to be a nightmare, and you can find yourself legally obliged to finish it for a number that stopped covering the work two days in.
It's not a technicality. It's contract law, it comes up in the small claims court, and tradespeople lose on it. So let's get it straight — what the two words actually mean, when to use each, and how to word a quote so a job going sideways doesn't come out of your pocket.
The legal difference, in one line
A quote is a fixed price. Once the customer accepts it, it's a legally binding contract — you've agreed to do that work for that money.
An estimate is an educated guess. It's an approximate figure to give the customer a rough idea, and it isn't binding — the final price can move as the job becomes clearer.
That's the whole distinction, and everything else follows from it. The word you write on the document is the word that counts. Put "quote" on a piece of paper, the customer says yes, and you are on the hook for that price — even if you later discover the joists are rotten, the job takes twice as long, or you simply underpriced it.
Why it bites
Picture a bathroom refit. You have a quick look, reckon it's about four grand, and write "Quote: £4,000." Customer's delighted, says crack on. You rip the old suite out and find the floor's gone under the bath and the soil pipe's shot.
That extra work is real, and on an estimate you'd simply revise the figure. But you wrote quote. The customer accepted quote. You've a binding contract to deliver the job for £4,000. Try to charge £5,200 for the extra and the customer who refuses isn't necessarily being unreasonable — they agreed a fixed price, and if it ended up in front of a small claims judge you could lose, and be made to finish at the original figure.
Flip it round and the danger's obvious. The protection is just as simple.
When to give a quote, and when to estimate
The skill isn't avoiding quotes — a confident fixed price wins work and looks professional. The skill is knowing which job is which.
Give a quote when you can see the whole job and price it with confidence. Most straightforward domestic work — a rewire you've surveyed, a run of fencing, a kitchen you've measured, a boiler swap — you know what's involved, so a fixed price is right and reassuring to the customer.
Give an estimate when there are genuine unknowns you can't price until you're into it. Anything where the problem is hidden until you open it up: groundworks, suspected damp, old wiring behind plaster, structural repairs. Here you give an informed estimate and you say it's an estimate, in writing, so the customer understands the figure can move.
The mistake is defaulting to "quote" out of habit on a job you can't actually pin down. If you're not sure, estimate — and be explicit that's what it is.
How to word a quote so it can't bite you
Even when a fixed quote is right, vague wording is where margins quietly die. A few habits protect you:
- Itemise it. Break out labour, materials and the main tasks. A customer comparing three quotes isn't only looking at the bottom line — they're trying to understand what they're getting. Clarity wins the job and defines exactly what you agreed to do.
- State what's excluded. This is the big one. "This quote covers supply and fit of six double sockets and a consumer unit replacement. It does not include making good plasterwork, decoration, hidden repairs, or additional circuits." Now anything beyond that list is a variation — extra work, agreed and priced with the customer before you do it, not a fight afterwards.
- Put a validity period on it. "Valid for 30 days." Material prices move; you don't want a quote from last spring thrown back at you in the autumn.
- Label it clearly and date it. The word "Quote" or "Estimate" at the top, a reference, and a date. No ambiguity about which it is or when you gave it.
Do that and a fixed price stops being a risk. The scope is the contract; anything outside it is chargeable. That's the whole game.
Speed is the other half of winning the job
There's a second thing the research on winning work is blunt about, and it's got nothing to do with price: the tradesperson who quotes first usually wins.
The trades that get the job are the ones whose quote lands within a day or two of looking at the work. Leave it a week and the customer's already accepted someone else's — or worse, they've gone cold on the whole thing. The first professional, itemised quote to arrive sets the benchmark every other quote gets measured against. Same-day quoting isn't keenness; it's a genuine commercial advantage.
The problem, of course, is that writing a proper itemised quote is exactly the kind of admin that happens at the wrong time — in the evening, after a full day on site, when the last thing you want is to sit at a laptop. So it slides to the weekend, and by the weekend the job's gone. It's the same reason paper invoices quietly cost trades thousands and the same reason most tradespeople have a lead-capture problem, not a lead problem: the work to win and bill the job competes with the job itself, and the job wins.
Make the quote happen on the day
This is the part TradesOffice is built for. You message Amy the job from the van — "quote Mrs Hughes, bathroom refit at 14 Mill Lane, £4,200 labour and materials" — and she produces a clean, itemised, dated PDF clearly marked as a quote, emails it to the customer, and records it against the job. Usually inside a minute, from your phone, in WhatsApp.
That does two things at once. It gets the quote in front of the customer today, while you're still the front-runner — and it makes sure the document is a proper one: labelled correctly, itemised so the scope is clear, dated, the kind of quote that protects your price rather than exposing it. If you'd rather check it first, Amy holds it as a draft until you say send.
The word at the top of the page matters more than most tradespeople realise. Get it right, say exactly what's included, and get it out the same day — and you've turned the most dangerous document in the trade into the one that wins you the work and guards your margin.
Frequently asked questions
What's the legal difference between a quote and an estimate? A quote is a fixed price that becomes a legally binding contract once accepted. An estimate is a non-binding approximation that can change as the job becomes clearer. The word on the document decides which it is.
Can I charge more than my quote? Generally no — an accepted quote binds you to that price for the work described, even if it costs you more than expected. You can only charge extra for work outside the quoted scope (a variation the customer agrees to), which is why stating exclusions matters. If you can't price it confidently, give an estimate and label it as one.
Should I give a quote or an estimate? Quote when you can see and price the whole job confidently — most domestic work. Estimate when there are real unknowns you can't price until you open things up. Don't default to "quote" out of habit on a job you can't pin down.
How do I stop a quote costing me money when the job changes? Itemise it, state clearly what's excluded, and add a validity period. Anything beyond the listed scope becomes a chargeable variation, agreed before you do it. Specific quotes protect your margin; vague ones don't.
A quote is a contract. An estimate isn't. The fastest, clearest, correctly-labelled document usually wins the job — and protects you when the job doesn't go to plan.
TradesOffice is a WhatsApp-first administration service for UK sole traders. Tell Amy the job and she produces an itemised, dated, properly-labelled quote and emails it to the customer — usually within a minute. No app, no new number, no laptop on a Sunday.
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