How to Write a Contract for Home Renovations in NZ

How to Write a Contract for Home Renovations in NZ

Here is the thing most homeowners don't know: if your renovation costs $30,000 or more including GST, a written and dated contract isn't just sensible — it's the law. A builder who enters into an unwritten contract at that level commits an infringement offence. The Building (Residential Consumer Rights and Remedies) Regulations 2014 set that threshold, and it catches more renovations than people expect. A kitchen, a bathroom plus a bedroom, a re-clad — you're there.

There's a second layer too. Before you even sign, the builder must have given you prescribed disclosure information and a checklist. Most people have never heard of either document. Ask for them and you learn something about the builder before a single nail is driven.

And the promises that come with residential building work — competent workmanship, compliance with the law, completion within a reasonable time — are implied by the Building Act itself. They can't be contracted out of. Whatever the builder's standard terms say, certain warranties travel with the job.

How We Researched This Guide

We worked from the Building Act 2004 directly, reading sections 362D, 362F, 362G and the implied warranties in sections 362I to 362K, alongside the Building (Residential Consumer Rights and Remedies) Regulations 2014. Building Performance's homeowner guidance filled in the practical detail on what a compliant contract must actually contain — the payment process, the defect remedy clause, the notices between parties, and the dispute resolution process.

One thing surprised us. The penalties for getting the paperwork wrong are real: entering an unwritten contract is an infringement offence with a fine up to $2,000, and knowingly making a false or misleading statement in the required disclosure information carries a fine up to $50,000 for an individual or $150,000 for a body corporate. We also checked the Construction Contracts Act 2002 payment machinery, which is set out in full on legislation.govt.nz, because that's what governs when a payment claim actually falls due.

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The Quick Summary (60-Second Version)

If you read nothing else, read this:

• At $30,000 or more including GST, the contract must be in writing, must be dated, and must comply with the regulations. No exceptions.
• Before signing, the builder must have provided the prescribed disclosure information and a checklist. Ask for both.
• The contract must reference the implied warranties in sections 362I to 362K. If it's silent on them, it's missing something the law expects.
• Payment terms must tie to stages of completed work, not calendar dates, and must explain how payments are invoiced and receipted.
• Allowances and the variations clause decide your final price more than the headline number does. Get both in writing.
• Keep a signed copy, every variation, and every email in one place. The paper trail is the protection.

What the Law Requires Before You Sign

Section 362D of the Building Act 2004 says a building contractor must not enter into a residential building contract to which the section applies unless they have first provided the client with the prescribed disclosure information and a prescribed checklist. That's a screening test you can run in the first conversation. A contractor who doesn't know these documents exist is either very new or not complying.

Section 362F then requires the contract itself to be in writing, dated, and compliant with the regulations. Contravening that by entering an unwritten contract is an infringement offence with a fine not exceeding $2,000. The same penalty applies to failing to provide the disclosure information or checklist when section 362D applies.

The serious offence sits above those. Knowingly making a false or misleading statement in a material particular, or knowingly making a material omission, in the required disclosure information and checklist carries a fine on conviction of up to $50,000 for an individual and up to $150,000 for a body corporate.

What the contract must contain

Building Performance lists the required content. The price, scope and timing. The payment process, including dates or stages for payment and how payments will be invoiced, made and receipted. How defects will be remedied, including reference to the existence and application of the implied warranties. The notices and certificates to be given between the parties. And the dispute resolution process.

Two further points sit alongside that. The contractor is responsible for obtaining all consents and approvals on the client's behalf. And the contractor may not submit a final payment claim until the building work is complete and, where one is required, the Code Compliance Certificate has been provided.

The warranties you don't have to negotiate for

The Building Act implies warranties into residential building contracts. Building Performance's guidance describes them as covering competent workmanship, the plans and specifications, obtaining consent, compliance with the law, the suitability and newness of products, reasonable care and skill, completion within a reasonable time, habitability, and fitness for a stated purpose.

What Else Should Be in the Document

The statutory content is the floor, not the ceiling. A renovation contract that only does the minimum leaves the two clauses that decide your final price — allowances and variations — entirely to chance. Here's what we'd want in the document before signing anything.

The parties, the scope, and the versions

Name the parties properly, with correct legal names, the business address, and the company or trading name. Not just "Dave". Describe the work by reference to drawings and specifications, and give each drawing a version or a date so there's no argument later about which one was agreed.

Then state the inclusions and, explicitly, the exclusions. A cheaper quote usually means more exclusions rather than a better price for the same thing, and the contract is where that becomes visible. Attach the drawings, the specification, and any product schedules.

Money: allowances, variations and payments

Allowances and provisional sums should each be a separate line with a defined standard and an agreed process for what happens if you exceed them. This is where renovation budgets most often fail — the appliances and surfaces were allowed at one level and specified at another.

The variations clause matters just as much. Nothing should proceed without written approval, and the clause should say how a variation is priced. The Construction Contracts Act 2002 supplies the payment machinery underneath: under section 18, a payment becomes due and payable 20 working days after a payment claim is served. Ask what happens if you withhold money in dispute.

The rest of the list

Questions You Might Have

Can I write the contract myself?

You can, and plenty of homeowners do. The risk is that a template drafted for a different project won't cover your allowances, your variations process or your site arrangements. If the project is large or the scope is complex, having a construction lawyer look at it is money well spent. At minimum, check the contract against the Building Performance list of required content before you sign.

What if the builder won't provide a written contract?

At $30,000 or more including GST, they're legally required to, and entering an unwritten contract is an infringement offence. A builder who resists at that level is telling you something before the work starts. Below the threshold, a written contract still isn't optional in any practical sense — it's the only reliable record of what was agreed, and it's what you'd rely on if the job went wrong.

What happens if there's no written contract at all?

Building Performance notes that where the requirements haven't been met and there's no written contract, or the contract doesn't comply, certain matters are considered part of the contract. That's not an outcome to rely on. The protective clauses around variations, payments and disputes simply don't exist in a document that was never written.

Should I pay a deposit before signing?

Deposit requests are normal for materials, but connect them to a written contract with defined milestones and a payment schedule tied to stages of completed work. Never pay a large sum upfront to someone with no verifiable credentials, no contract and no fixed business address. Deposits paid to an insolvent trader are usually unrecoverable, which is why the paperwork matters more than the price.

What do I do if something goes wrong after signing?

Put your concern in writing and give the builder the chance to fix it. That step matters — if you get the fault fixed elsewhere first, you can lose your right to a remedy. If it isn't fixed within a reasonable time, the Disputes Tribunal can hear claims up to $60,000, and the filing fee for a claim between $30,001 and $60,000 is $496.

What Matters Most

The contract is not paperwork that happens after the decisions. It is the decision. Everything you failed to pin down — the allowance, the exclusion, the variation process, the defects period — becomes a conversation you have mid-build, when the framing is up, the money is committed, and your leverage is gone.

So treat the document as the deliverable. Ask for the disclosure information and the checklist first. Confirm the contract is written and dated. Check that it references the implied warranties, that payments tie to stages of completed work, and that variations need written approval before anything proceeds.

Get those right and the rest of the renovation is a building project. Get them wrong and it becomes a negotiation you're having from behind.