When the bill differs from your quote

Start by comparing the agreed work with the invoice and any changes you authorised. Ask the provider to explain the difference in writing. Whether a payment or remedy is due depends on the agreement, work and applicable law.

Compare these three records

• The original agreement: the quote, inclusions, exclusions, payment terms and messages about the job.
• Any changes: extra work requested, the price discussed and when agreement was given.
• The final invoice: itemised work, parts, attendance charges and any amounts already paid.

A FairCost modelled estimate is a comparison aid. It does not establish what you agreed to pay or decide whether an invoice is legally valid.

Ask for a clear explanation

Contact the business first. Identify the difference, attach the relevant records and explain the outcome you are seeking. Adapt this message to your circumstances:

The invoice differs from the quote I accepted. Please identify the work or charges that changed, the amount for each change and the record of our agreement to those changes. I have attached the quote and relevant messages. Please explain the difference and confirm how we can resolve it.

Keep a copy of your request and the response. If you cannot resolve the issue, use the official guidance below to find appropriate consumer assistance. The ACCC does not resolve individual disputes.

Before paying a deposit

Ask for payment stages, cancellation terms and inclusions in writing. Check the rules for the location and type of work; this guide does not prescribe a universal deposit limit, dispute limit or cooling-off period.

Official guidance

• ACCC: contracts and agreements
• ACCC: steps to resolve a problem with a business

Sources checked 14 October 2026. General information; get advice about your own agreement if you need a legal assessment.