Quote vs Estimate vs Quotation: What's the Difference?
A customer asks you for a price. You send a number. Weeks later they are angry because the final bill is higher, and you are out of pocket because you called it the wrong thing. Quote, estimate and quotation get thrown around as if they are interchangeable, but they are not, and the difference decides whether you are allowed to charge more at the end. Getting this right costs nothing and protects every job you take on. Here is exactly what each word means, which one ties you to a price, and when to send which.
The short version
If you only remember three lines, remember these. Quote: a fixed price you commit to. Quotation: the formal word for a quote, same meaning. Estimate: an approximate price for work you cannot fully pin down yet.
The practical difference is who carries the risk if the job costs more than expected. With a quote, you do. With an estimate, the client shares it, as long as you flagged the risk honestly up front. Everything below is really just that one idea, spelled out.
Quote and quotation: the same thing, and it is a promise
A quote and a quotation are the same document. Quotation is just the more formal word for it. Both mean a fixed price for a clearly defined piece of work: this is the job, this is what it costs, and the number will not move as long as the work does not change.
That fixed part is the whole point. Once a client accepts your quote, you have effectively agreed a price, and you are expected to honour it. You cannot do the agreed work and then decide it was worth more, though you can revise the price if the client changes the scope or genuinely unforeseen conditions appear (more on that below). If you can describe the job precisely and you are confident about what it will take, a quote is what you send. You can put one together in a couple of minutes with a free quotation generator.
An estimate is an educated guess, not a commitment
An estimate is your best, honest approximation of what a job will cost before all the details are known. It is useful when the scope is still fuzzy: a renovation where you have not opened the wall yet, a design project where the brief might grow, repair work where you will not know the damage until you start.
Because an estimate is a guess, the final invoice can come in higher or lower. But it is not a free pass to charge whatever you like. An estimate should be a reasonable, good-faith figure, and if the real cost is going to blow past it, the professional move is to stop and tell the client before you run up the bill, not after.
Which one is legally binding?
In most places, an accepted quote forms a binding agreement on price. Once the client says yes, you generally cannot raise the figure unless the work itself changes, for example the client adds something that was not in the original scope. That is why a quote should always spell out exactly what is, and is not, included.
An estimate is weaker on purpose. The final charge can differ, but a customer can reasonably expect it to land in the same ballpark, and wildly exceeding an estimate with no warning is exactly the kind of thing that ends in a dispute or a refusal to pay. This is general guidance, not legal advice, and the fine detail varies by country, so when a contract is large it is worth checking your local rules.
A quick example
Say a client wants a room painted. If you have seen the room, measured it, and know the paint, you send a quote: "$520, fixed." They accept, you paint, you invoice $520. Done.
If you have only heard about the room over the phone, you send an estimate: "Likely $400 to $600, depending on the wall condition." You go in, find the walls need filling and a primer coat, and you call the client first: the final figure will be at the top of the range. Same job, two different documents, because in one case you knew the scope and in the other you did not.
Quote vs estimate vs quotation, side by side
Same three documents, compared on the things that actually matter:
Price type. Quote and quotation: a fixed figure. Estimate: an approximate figure, usually given as a range.
Is it binding? An accepted quote is generally binding on price. An estimate is not a fixed commitment, though it must be made in good faith.
Who carries an overrun? On a quote, you do. On an estimate, the client does, provided you warned them before the cost climbed.
When to use it. Quote when the scope is clear. Estimate when there are real unknowns you cannot price yet.
What it should contain. A solid quote names the scope, lists exclusions, states a validity date, sets payment terms, and says how changes are handled. An estimate should add a visible line that the final figure may move and why.
Is a quote legally binding? The specifics
The usual chain is simple: your quote is an offer, and the client accepting it forms an agreement on price. From that point you are generally expected to deliver the quoted work for the quoted figure. This is general guidance, not legal advice, and the detail varies by country, so check your local rules for anything large.
A few specifics that save arguments. Put an expiry on it, for example "valid for 30 days". Prices and your availability change, and an open-ended quote can come back to bite you months later. If a client tries to accept after the expiry, you are free to requote. You can usually withdraw a quote before the client accepts it, but not after, so be deliberate about when you send it.
The one clean way to charge more on a quoted job is a change order: when the client adds or alters work, note the new scope and the new price in writing and get a quick yes before you carry on. That keeps the original quote honest and the extra properly agreed.
Is a "free quote" really free?
"Free quote" and "free estimate" usually mean the pricing itself costs nothing: you work out a figure for the customer at no charge, hoping to win the job. That is standard in most trades and services, and offering one is a normal way to compete.
What it does not mean is that you are committing to anything by quoting, or that detailed work should be free forever. If preparing the number takes real effort, a site visit, measurements, a design, it is fair to either fold that into the job or charge a consultation fee that you credit back if they go ahead. A free quote wins trust; giving away billable work does not.
Where quotes go wrong (and how to avoid it)
The same few mistakes cause most quoting disputes. Avoiding them is most of the battle.
Vague scope. "Paint the house" invites argument. Spell out exactly what is and is not included, so "extra" is obvious to both of you.
No expiry date. An undated quote is a price you accidentally promised forever. Always add a validity window.
Silent on materials. Say whether materials are included, and whether the figure is fixed or time and materials, before the work starts.
Calling a guess a quote. If you cannot see the full job, send an estimate and say so, rather than a "quote" you will have to break.
Changing the number at the invoice. When the job is done, carry the accepted figure straight onto the invoice unchanged. A surprise on the bill is how a happy client becomes a late payer.
When to send which, and what comes next
Send a quote when the scope is clear and you can commit to a price. Send an estimate when there are real unknowns, and then follow up with a firm quote once you have pinned the details down. If you are weighing how to write either one, our guide on how to write a quote walks through the structure, and invoice vs quotation covers where the invoice fits in.
Once a quote is accepted and the work is done, the last step is getting paid: turn the accepted numbers straight into an invoice without changing them, so the client sees the exact figure they agreed to. A free invoice generator lets you carry the quote over and send it in minutes.
