Quote vs estimate: which one is binding, and which one should you send?
18 September 2026
Tradespeople use the two words interchangeably. Customers don't, and neither does a court. The difference is worth understanding, because it decides whether the number you gave is the number you'll get.
The difference, plainly
A quote is a fixed price for a defined job. Once the customer accepts it, that price is the contract. If the job takes longer than you thought, that's your problem. If it's quicker, that's your gain.
An estimate is your best guess. It's not binding on price. The final bill can be higher, and if it's reasonable and you've been straight about what changed, the customer has to pay it.
That's the whole distinction. A quote transfers the risk of getting it wrong onto you. An estimate keeps it with the customer.
So which should you send?
Send a quote when you can see the job. Brake pads, a boiler service, a fence panel, a rewire you've surveyed properly — you know what's involved. A fixed price wins work, because the customer knows what they're paying, and it gets you paid, because there's nothing to argue about at the end.
Send an estimate when you genuinely can't. Opening up a floor, chasing a fault you haven't found yet, anything where the scope depends on what you discover. Say so plainly: "Estimate — final price depends on the condition of the joists once the boards are up." Then re-quote the moment you know.
The mistake is sending an estimate for a job you could have quoted, because it feels safer. It isn't. It just moves the argument to the end, when you've already done the work and the customer has all the leverage.
What makes a quote hold up
A quote is only as strong as what's written in it. Three things turn a number into an agreement:
The scope. What's included, and — more importantly — what isn't. "Supply and fit 8 panels, remove and dispose of old fence" leaves no room for "I thought you were doing the gate too."
The terms. How long the price is valid, when payment's due, what deposit you need, what happens if they want extras. These are the lines that settle every disagreement before it starts.
The acceptance. A quote the customer has signed is a contract. A quote they read and replied "great, go ahead" to is probably one — but you'll spend an afternoon proving it. A quote that was never acknowledged at all is just a number you once mentioned — and that's where non-payment starts.
Estimates that turn into quotes
The best pattern for uncertain jobs is a two-step. Estimate first, honestly. Then, the moment the unknown becomes known, send a proper quote for the rest and get that signed before you carry on. It means every pound you invoice was agreed in advance.
QuoteNod is built for the quote side of this: a fixed price with the scope and terms attached, signed by your customer on their phone before you start, with a PDF record for both of you. When the job changes, a revised quote goes out from your phone. Free for 14 days.