Mechanic Ripped You Off? How to Fight an Inflated Repair Bill in Australia

You dropped the car off for a service and a “quick look” at a noise. You picked it up with a bill three times the quote, a list of parts you never approved, and a mechanic shrugging that “it needed doing”. Or worse: you paid, drove off, and the original problem is still there.

The mechanic is counting on you not knowing the rules. But motor vehicle repair is one of the most heavily regulated consumer services in Australia, and the rules almost all favour you.

Your rights

• Services must be done with due care and skill (s 60 ACL), be fit for the purpose you told them about (s 61), and be completed in a reasonable time (s 62). If the repair didn’t fix the fault, or made it worse, they’ve failed a consumer guarantee. You can require them to fix it free, or for a major failure, get a refund and compensation for consequential loss (s 267–268 ACL).
• Parts must be of acceptable quality (s 54 ACL). A part that fails early is the supplier’s problem, not yours.
• You only pay for what you authorised. A quote is an offer; when you accept it, that’s the contract. Work outside the quote needs your fresh consent. Unauthorised work is not your debt, and charging for it can be misleading conduct (s 18) or a false representation about price (s 29(1)(i)).
• State repairer laws. New South Wales (Motor Dealers and Repairers Act 2013) requires repairers to be licensed and to provide itemised invoices. Victoria’s Australian Consumer Law and Fair Trading Act and Queensland’s Motor Dealers and Chattel Auctioneers Act impose similar obligations. Western Australia requires repairers to be licensed under the Motor Vehicle Repairers Act 2003. Many states require repairers to give a written quote if you ask, and to get your OK before exceeding it.
• Repairer’s lien. A repairer can hold your car until you pay for authorised work. They cannot hold it for disputed, unauthorised work. Pay the undisputed portion “under protest” in writing to get your car back, then chase the rest.

What to do right now

1. Gather the paperwork. The original quote (text, email, or what was said), the invoice, any texts or calls where they mentioned extra work, and photos of the vehicle. If you don’t have an itemised invoice, demand one in writing.
2. Get a second opinion. Have another licensed repairer inspect the work and put in writing what was done, what wasn’t, and what a fair price would have been. This is your key evidence.
3. Work out the figure. Separate the bill into: work you authorised at the quoted price, work you didn’t authorise, and work that was done badly. Your demand is the unauthorised and defective portions, plus any cost of remedial work elsewhere.
4. Write to the repairer. State exactly what you dispute and why, cite the ACL guarantees and your state’s repairer law, and give them a chance to fix it (they’re entitled to that for a non-major failure) or refund.
5. Send a Letter of Demand. If they refuse, a formal letter with the legal basis, the second-opinion evidence, the amount, and a 14-day deadline before tribunal action puts them on notice. If it goes further, the tribunal will look at the second opinion and the invoice.
6. Escalate. Complain to your state fair trading body (NSW Fair Trading actually has motor vehicle dispute specialists), then lodge at NCAT, VCAT, QCAT, SACAT, or your state equivalent. Claims under $10,000–$25,000 depending on state are heard cheaply and without lawyers.

“But you drove it away”: the arguments mechanics use

• “You accepted the work when you paid and drove off.” No. Paying to retrieve your car is not acceptance of the quality or the price. Tribunals understand you needed your car back. Paying “under protest” in writing removes any doubt.
• “It needed doing, we’d have been negligent not to.” Possibly true, but that doesn’t give them the right to charge you without asking. If they found a genuine safety issue, the correct step was to call you, explain, and get your OK. If they didn’t, the work is unauthorised.
• “The quote was only an estimate.” A quote is binding once accepted. An “estimate” must be clearly labelled as such, and even then, a significant increase needs your consent before proceeding. Most state repairer laws say this explicitly.
• “That’s a new fault, not related to what we did.” This is where the second opinion matters. An independent mechanic’s report that the current fault is the same one you brought the car in for, or was caused by the repair, shifts the burden back to them.
• “We’ll fix it, but there’s a diagnostic fee.” If it’s their failed repair, there is no fee. The ACL says the remedy for a non-major failure is repair at no cost to you.

Realistic outcomes: unauthorised work can be disputed in a formal letter that cites the state repairer law. For defective repairs, you can claim a refund of the failed work plus the second mechanic’s invoice. You can also ask for the cost of the independent inspection, so keep that receipt.

Who to complain to

NSW Fair Trading (Motor Vehicle Repairs), Consumer Affairs Victoria, Queensland OFT, Consumer Protection WA, CBS South Australia. If the repairer is a member of the Motor Traders’ Association or VACC, those bodies have dispute processes. The ACCC takes reports on systemic overcharging. For dealer-arranged repairs under warranty, you can also complain about the dealer and manufacturer.

Start your claim — $49

Claim Done drafts your Letter of Demand in about 5 minutes for $49. Tell us what happened — we handle the legal language.

Start My Claim — $49 →

You approve it before anything is sent.