Knowing the difference between a quote and a contract—and how to manage any changes—can help keep your project on track and prevent costly disputes.
Quote vs contract—What's the difference?
A quote is a formal statement from a contractor outlining how much they’ll charge to do the job. Once you accept a quote (in writing or even verbally), it becomes a legally binding contract.
Before accepting a quote, check that:
- the contractor is licensed and qualified by using our free online licensee register
- they’ve included terms and conditions
- they’ve disclosed all costs and fees such certifications, soil tests and dumping fees
- you’ve checked reviews and seen examples of their previous work.
When to use a written contract
If your job is worth over $3,300, Queensland law requires a written contract that complies with the QBCC Act.
A written contract sets clear expectations, including:
- the full scope of work
- costs and payment schedule
- start and finish dates
- any cooling-off periods or termination clauses.
Download our free contract checklist to make sure everything’s covered before signing.
Contract variations—How to deal with change
Sometimes, changes happen during a project—maybe you decide to upgrade your fittings, or unexpected structural work is needed. These are called contract variations, and they need to be handled with care.
Failing to properly document variations is one of the most common causes of building disputes. The good news? It’s easy to avoid if everyone sticks to the rules.
How to document a variation
Before any variation work begins, your contractor must:
- give you the variation in writing (delivered in person, by post or email)
- include details like the change in work, any delay, and cost adjustments
- send it within five business days of your agreement—or before work starts, whichever comes first.
Every variation should clearly outline:
- what the change is (materials or work)
- when the change was requested
- any impact on project timelines
- how the cost is changing, and when that change takes effect.
Contract conclusions
Clear, written agreements—from the initial quote to the final contract and any changes along the way—are essential for a successful building or renovation project. They reduce the chance of issues arising because everyone is on the same page before the work starts.
Visit our Home Owner Hub for step-by-step guidance through the building and construction process—from planning to completion—including practical information about finding licenced contractors to quote for work and preparing contracts.
