The protections you have whether you ask for them or not

Somewhere in the Building Act 2004, at sections 362I to 362Q, sits a set of protections that most homeowners have never heard of, even while relying on them. They are called the implied warranties, and they are written into every residential building contract in New Zealand automatically. Nobody has to ask for them. Nobody can quietly remove them. They apply whether your contract is forty pages or a handshake, and they last ten years.

Builders' marketing tends to lead with badges and guarantee products, so it is easy to come away believing your protection depends on choosing the right logo. It does not. The floor under every residential job in the country is the law itself, and knowing what is on that floor changes how you weigh everything sold on top of it.

The implied warranties, in plain words

The Act implies a set of promises into all residential building work, regardless of the contract's form or the job's value. Summarised without the legal furniture, the work is warranted to be:

• Done competently, with reasonable care and skill, and in accordance with the plans and specifications in the contract. Workmanship is not a bonus feature. It is warranted.
• Built with suitable materials, and where materials are new, that they are new. Fitness of what goes into the house is covered alongside the labour that installs it.
• Compliant with the Building Code and with all other legal requirements, including the building consent. Legality of the work is itself a warranty, not merely a hope.
• Completed within the agreed timeframe, or a reasonable time where none was agreed. Time is inside the warranties too, which surprises people on both sides of the contract.
• Fit for purpose. Where the household is to live in the result, the home must be suitable for occupation, and where you made a particular purpose or outcome known and relied on the builder's skill, the work must be reasonably fit for it.

These run for ten years, they cannot be contracted out of for residential work, and they are enforceable against the contractor regardless of what any membership badge or guarantee brochure says. That is the floor. Everything else is furniture.

The twelve-month defects period

On top of the warranties sits a piece of protection with unusually practical teeth. For defects you notify within one year of completion, the builder must put them right, and during that first year the burden of proof is reversed: it is on the contractor to show a notified defect is not their liability, rather than on you to prove it is.

Anyone who has ever argued about whether a sticking door is a settling house or a builder's problem will recognise how much that reversal matters. In the first year, the default answer favours you. Our version of this is deliberately simpler than the law: something has moved, stuck or failed in the first year, you ring us, we come and look. But notice that the law obliges a version of this from every builder, whether or not it is on their website.

After the first year, the warranties keep running but the mechanics change. The reversed burden expires with the defects period, so from year two to year ten it is on you to show a problem is a breach of warranty rather than wear, misuse or the house simply being lived in. That is a higher bar, and it is one more reason to raise problems promptly rather than saving them up: the same defect is easier to deal with inside the first year than outside it, in law as well as in fairness.

The mandatory contract

The third leg: residential building work of $30,000 or more including GST legally requires a written contract, and the builder must provide prescribed disclosure information alongside it. The days of large jobs running on a quote and a handshake are legally over, which protects everyone, mostly you.

Treat the threshold as a floor rather than a trigger. A builder who volunteers a proper written contract on smaller jobs, as we do on everything regardless of size, is telling you how they operate when the law is not forcing them. A builder edging a large job along without one is not offering you flexibility. They are removing your paperwork while keeping theirs.

And if a builder ever will not put a genuine defect right, the warranties are the ground you stand on. The practical path runs from a clear written request, through whatever dispute process your contract names, to the formal routes that exist for building disputes. Most problems never get past the first step, because most builders, faced with a specific written request citing a specific obligation, simply fix the thing. The paperwork is not for the fight. It is mostly how you avoid one.

None of this makes guarantee products or association memberships pointless. They can add real cover, particularly for the situation the Act handles worst, a builder who is no longer around to meet their obligations, and we have written separately about what each badge means. But the order of operations matters. Start from what the law already gives you: ten-year warranties, a reversed burden for the first year, a mandatory written contract. Then ask what any product adds on top, and what it costs. You are better protected than you thought before you read the brochure. The brochure should be judged from that starting point.