Quote vs estimate: what Aussie tradies need to know

Plenty of tradies use the words quote and estimate like they mean the same thing. They don't, and the difference matters the day a client waves your piece of paper at you and says you're charging more than you said. Knowing which one you gave, and which one you meant to give, protects your margin and your reputation.

The short version

A quote is a fixed price. You are committing to do the described work for that amount, and once the client accepts it you are held to it. An estimate is your best guess at the likely cost. It is not a promise, and the final invoice can come in higher or lower depending on what the job actually takes.

Why the difference bites

If you hand over a document headed Quote and the job blows out, the client can reasonably expect to pay the quoted figure, and you wear the difference. If you call it an Estimate and keep the client updated as costs move, you have room to charge what the work really cost. Under Australian Consumer Law you also must not mislead a client about your prices or the reasons a price has changed, so vague paperwork cuts against you either way.

• Use a QUOTE for defined work: a deck to a fixed design, a set number of doors hung, a room lined
• Use an ESTIMATE for uncertain work: a reno where you can't see behind the walls, storm-damage repairs, anything with rot or termites in play
• Whichever you give, write down exactly what is included and what is not
• Put a validity date on it so an old price can't be held against you months later

When a quote becomes a contract

business.gov.au puts it in one line: if a customer accepts your quote, it becomes a legally binding contract. The moment the client says yes, the piece of paper stops being a price and starts being the agreement you both have to stick to.

Acceptance is broader than a signature. The ACCC's guidance on contracts says there is generally a contract whenever a seller makes an offer and a buyer accepts it, and the buyer can accept by signing, by saying they accept, or through actions such as paying. A text saying 'go ahead' or a deposit landing in your account can be enough.

Once a quote is accepted:

• The price is fixed for the scope you described. If you missed something in your take-off, that is your cost, not the client's
• You are bound to do the work as described, and the client is bound to pay the price on the terms in the quote
• Anything outside that scope is a variation. It needs its own price and the client's agreement before you do it
• The inclusions, exclusions, payment stages and validity date are now contract terms, so a vague quote becomes a vague contract

That is why the detail matters more than the total. A quote that just says 'Deck' and a figure leaves every argument open: what timber, what size, who removes the old one, is the balustrade in. Our guide on how to quote a carpentry job builds the number line by line so the scope is nailed down before anyone signs.

What Australian Consumer Law expects

The Australian Consumer Law does not tell you whether to quote or estimate. It sets the ground rules for how you talk about price, and the ACCC's guidance for business is blunt: businesses must communicate clear and accurate prices before purchase, and must not mislead consumers about their prices or the reasons for price changes.

The ACCC also says it makes no difference whether a business intends to mislead or not, and that any claim a business makes about its products or services must be accurate, truthful and based on reasonable grounds. For a tradie, that means an estimate cannot be a lowball number you already know the job will blow through.

One more rule is worth knowing. The ACCC says a business must display the total price of a product or service as a single figure, including any taxes and unavoidable or pre-selected extra fees, and if a price is shown for just one part, the total must be at least as prominent. That guidance is written for advertised and displayed prices, and the ACCC's misleading-claims page lists advertising a price without GST or other costs as one way to mislead on price. The same habit makes a quote safer: make the inc-GST total the big clear number, not a subtotal with the GST buried underneath.

business.gov.au's quote checklist covers the rest. A written quote should include at least your business name, ABN and contact details, the customer's details, a clear description of the work, itemised and total costs including GST if it applies, any variations already discussed, payment terms and your preferred payment method, start and finish dates, a quote expiry date, and a space for the customer to sign and date their acceptance.

A quote acceptance clause you can copy

A quote is easier to enforce, and easier to live with, when it says on its face what acceptance means. Here is a plain-English example you can adapt. It is an example, not legal advice, so read it against your own jobs and adjust it.

Once the client accepts it, a quote with that clause on it is a small contract in its own right. On residential work, though, each state sets a dollar figure above which a formal written contract is required. In NSW that is a contract price over $5,000 including GST, with a simpler small jobs contract for work between $5,000 and $20,000 and a fuller large job contract above that. In Victoria it is domestic building work worth more than $10,000, which needs a major domestic building contract, and Consumer Affairs Victoria recommends a written contract for smaller work too. In Queensland it is domestic building work priced over $3,300 including labour, materials and GST. Above your state's figure, check with your state fair trading body or building regulator, or a lawyer, before you rely on a quote and a clause as the whole contract.

Estimates that will not bite you

An estimate is not a lesser quote. It is a different document for a different situation, and it only protects you if it is written like one. The mistakes that turn estimates into disputes are usually the same: a single figure instead of a range, no note of what the figure depends on, and no update until the invoice lands.

How to word an estimate range

• Head it Estimate, not Quote, and say up front that the final cost will be based on the actual time and materials the job takes
• Give a range and say what moves it: if the subfloor is sound, around the low end; if there is rot in the bearers, closer to the high end
• State the rates the final bill will use: your hourly rate, how materials are charged, and any call-out or hire costs, plus what the estimate excludes
• Promise an update before you go past the top of the range, then keep that promise

That last point does the most work. The ACCC's rule on the reasons for price changes cuts both ways: if the estimate said rot would push the price up and you show the client the rot, the higher bill is exactly what you told them to expect.

When to turn an estimate into a quote

An estimate should be a stage, not a permanent state. Convert it to a quote as soon as the unknowns are gone. On a reno, that is usually once the demo is done and you can see the frame. On a landscaping job, it is once the first hole is dug and you know what the ground is like. TrackYaTradie is built for landscapers and the other trades where the first day on site tells you what the job really is.

• Quote what you can define now and estimate only the part you genuinely cannot see
• Once the unknown is opened up, price the rest properly and send a quote before you order materials
• If the client wants a fixed price and you cannot give one, quote a first stage (demo, investigation, make-safe) at a firm price and estimate the rest

Protect your margin either way

The label matters, but the real protection is a clear scope, sensible progress claims and payment stages on bigger jobs, and pricing every one of your variations the day it comes up, with a written yes before the work starts. A quote with a tight inclusions-and-exclusions list is far safer than a bare number, and an estimate is only useful if you actually track the real costs against it as the job runs, so you can show the client where the money went.

That last part is where a lot of tradies come unstuck. If you're quoting or estimating off gut feel and only finding out the real cost at the end, you can't defend your number. Run the job through the job profit calculator before you send the quote, and see job costing for tradies for tracking the real number as you go. TrackYaTradie lets you build a quote off your own price list, mark it clearly, and track live costs against it as you work, so your final invoice always has the numbers to back it up.