What a compliant building quote actually has to cover once a job crosses $30,000, and the details worth checking on a smaller job too.
Once residential building work reaches $30,000 (including GST), New Zealand law requires a written contract, and it's the builder's job to provide one, not yours to ask. A compliant contract needs both parties' details, the site address, the price or how it's calculated, start and completion dates, a payment schedule, how variations are priced, and a dispute resolution process. Below that threshold a written quote isn't legally required, but the same checklist is still worth insisting on.
A building quote can look like a single number on a page, but a proper one is really a contract in miniature, and what it leaves out often matters more than what it includes. Knowing what should be there before you sign saves an argument later.
Here's what the law actually requires once a job crosses $30,000, and what's worth checking even when it doesn't.
Under the Building Act 2004, once residential building work costs $30,000 or more including GST, you and your builder must have a written contract. The obligation sits with the builder, not the homeowner, so it's on them to provide a compliant document rather than you having to chase it up.
For work below that threshold, a written contract isn't a legal requirement, but that's a floor, not a recommendation. Anything beyond a small repair job is worth putting in writing regardless of the dollar figure.
A proper building contract sets out both parties' names and contact details, the site address, and the price or a clear method for calculating it. Beyond that, a handful of specific terms are what actually protect you if things don't go to plan.
Almost every renovation turns up something the original quote didn't account for, whether that's rot behind a wall or a foundation issue once digging starts. What separates a smooth variation from a dispute is whether the contract says how that extra work gets priced and approved before it happens.
Ask specifically what happens if the scope changes: will you get a written variation to approve before the meter starts running, or does extra work just show up on the final invoice? A builder who can answer that clearly, unprompted, is usually one worth hiring.
A builder who works to this standard as a matter of course, rather than only when a client asks for it, is generally the safer bet on a job of any size. It's a reasonable question to ask directly: does their standard quote already include a payment schedule and a variations process, or will you need to request one.
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It's not a legal requirement below that threshold, but it's still strongly recommended. A written contract protects both sides regardless of the job's size, and most reputable builders will provide one as standard practice.
The law puts the obligation on the builder to provide a compliant written contract once the threshold is reached. If they don't, it's worth raising directly before work starts, since it affects your ability to resolve a dispute later.
Only through the agreed variations process. A compliant contract sets out how changes to scope are priced and approved, so a builder shouldn't be able to simply add costs to the final invoice without your sign-off.
It's a disclosure document builders must give homeowners once residential work reaches $30,000, or on request below that. It covers things like the builder's licensing status, insurance, and a summary of your rights under the contract.
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