A surprising number of Australian tradie disputes start with a verbal quote on the kerb. The plumber says it’ll be about $1,200, the customer nods, and three weeks later the invoice arrives at $1,950. Both sides feel certain they know what was agreed. The law has its own view, and the answer is sometimes more nuanced than either side wants to hear. A verbal quote can be legally binding, depending on the work, the dollar value, the state, and what was actually said. Knowing where the line falls is useful before either side relies on a verbal number.
Here’s when a verbal quote actually becomes legally binding in Australia, when it doesn’t, and what both customers and tradies should do to avoid sliding into a fight that nobody can prove either way.
Verbal contracts are real contracts in most cases
Australian contract law generally recognises verbal agreements. A handshake deal is still a deal. The elements are the same: an offer, acceptance, an intention to be legally bound, and consideration (usually the price). For a small tradie job, a verbal quote followed by the customer agreeing to proceed and the tradie starting work is usually a contract. The challenge is not whether it exists. The challenge is what each side can prove was actually agreed when the dispute starts.
Some contracts have to be in writing
Several Australian states require residential building contracts above a defined value to be in writing. In NSW, residential building work above $5,000 must be in a written contract under the Home Building Act. Victoria requires a written contract for domestic building work above $10,000 under the Domestic Building Contracts Act. Queensland requires written contracts for domestic building work above $3,300, with stricter rules above larger thresholds. Below those values, a verbal agreement may technically be valid, but the law still expects a written record above. A verbal-only quote on a job that legally requires writing creates problems for the tradie, not just the customer.
“About $1,200” is not a fixed price
Verbal numbers are often given as estimates, even when the customer hears them as fixed quotes. “It should be around twelve hundred” is not a quote in the legal sense. It is an estimate. To create a verbal fixed-price contract, both sides must clearly intend the number to be binding. If one side gave an estimate and the other heard a quote, you have a misunderstanding rather than a contract. Tradies who routinely use words like “around”, “roughly”, “should be” and “give or take” should not be surprised when customers later argue the number wasn’t really a quote.
Witnesses and message threads decide most disputes
When a verbal-quote dispute reaches a tribunal, the question is rarely the law of contract. It is the question of what was actually said and on what basis. The side with corroborating evidence, a text message confirming the figure, an email summary of the verbal conversation, a partner who was standing in the kitchen and heard the price, almost always wins. The side relying solely on memory loses. This is true for both customers and tradies. Whoever sends the post-conversation summary message is usually the one with the stronger position later.
The customer’s “do whatever you need to” problem
Customers sometimes give an open instruction: do whatever you need to do to get it working. That phrase, spoken without a price cap, can amount to authorisation to incur reasonable costs at the tradie’s hourly rate plus materials. The customer who later argues they were quoted $400 for a “$2,800 actually” job is on weak ground if they used those words and never asked for a number before the work started. If you don’t want an open authorisation, don’t speak as if you’ve given one. Ask for a price first.
The tradie’s “I’ll let you know” problem
Tradies often say they’ll let the customer know if the price changes, then forget. A reasonable customer interprets that as a promise to be informed before the price moves. If the tradie carries on, doubles the cost, and presents an invoice without that conversation, they have weakened their own legal position. The Australian Consumer Law requires honest, non-misleading conduct. Promising to update the customer about price and then not doing so can be argued as misleading conduct, regardless of whether the underlying work was justified.
Send the post-conversation text
For both sides, the practical fix is simple. After any verbal price discussion, one of you should send a text or email summarising what was agreed. “Confirming you’ll do X for Y dollars, plus any extra agreed in writing.” The message takes 30 seconds. It also turns a verbal contract into a written one, or at least into a written record of a verbal one. Most tradies and customers don’t bother. The ones who do almost never end up in disputes about what was said. The cost of the habit is zero. The benefit is enormous.
Verbal variations are even worse
If a verbal main quote is risky, a verbal variation mid-job is worse. The tradie says “we’ll need another half day for that,” the customer nods, and three weeks later there’s a $480 line item the customer can’t remember agreeing to. Most state residential building schemes require variations to be in writing. Even when the law doesn’t strictly require writing, treating variations as verbal is the single most reliable way to end up in a dispute. Any time the price changes mid-job, get the change in writing before any more tools come out.
When it’s worth chasing a verbal quote in tribunal
Pursuing a verbal-quote dispute in a state tribunal like VCAT, NCAT or QCAT is possible, but the customer or tradie pursuing it has to prove what was said. That is harder than it sounds. Even when the underlying contract is real, the lack of evidence often pushes the matter to a settlement somewhere between the two parties’ positions. The numbers either side actually claimed at the start tend to lose detail by the end. If the dollar amount in dispute is small, it is often cheaper to settle than to chase the perfect outcome.
A verbal quote can be legally binding in Australia, but proving it usually depends on what each side wrote down afterwards. For residential building above the state threshold, a written contract is required by law. For everything else, the side that sends a confirmation text wins almost every dispute. Don’t rely on memory. Don’t rely on goodwill. Send the message. Save the message. Both customers and tradies are better off with a record than without one.