Renovation Contracts in NZ: What to Get in Writing Before You Sign
Quick answer: A renovation contract in NZ must be in writing whenever the residential building work costs $30,000 or more including GST, and the contractor has to give you MBIE’s consumer protection checklist and a disclosure statement before you sign it. Under that figure the law is looser, but the same paperwork still protects you.
Most renovation advice tells you to get three quotes. Very little of it tells you what you are actually signing when you pick one.
That gap matters, because the moment of signing is where the risk on an Auckland renovation gets allocated. Who pays when the framing behind a villa’s bathroom wall turns out to be rotten? Who applies for consent? What happens if the tiles you chose arrive six weeks late? All of that is decided in a document most homeowners skim once and file. This is a plain-English walk through the paperwork side of a renovation contract in NZ: what the law requires, what a real fixed price includes, how scope changes should reach you, and what you are still owed after the last coat of paint goes on.
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What a Renovation Contract in NZ Has to Cover Before You Sign
New Zealand has a consumer protection layer sitting underneath every residential building job, and it kicks in at a specific number.
The $30,000 Line, and Why It Is Not a Loophole
Per MBIE’s Building Performance guidance, if residential building work will cost $30,000 or more including GST, you must have a written contract with your building contractor. That threshold catches almost every renovation we get asked about. A single bathroom can clear it. A kitchen almost always does. A full home renovation is nowhere near the line.
Under $30,000, a written contract stops being compulsory. It does not stop being sensible. Building Performance actively encourages a written contract below the threshold too, and the small jobs are exactly where verbal arrangements go sideways: nobody wrote down whether the old vanity was being disposed of, and now there is a vanity on the front lawn and an argument about who pays to shift it.
💡 Quick tip: Price your job at its realistic total, not the hopeful one, before you decide whether the threshold applies. A $27,000 bathroom that picks up a heated towel rail, a new window and a rotten-floor repair is a $30,000-plus job with contract obligations attached.
Two Documents You Should Be Handed Before You Sign Anything
Once the work is over the threshold, two documents have to reach you before the contract is signed, not with the first invoice.
The first is the consumer protection standard checklist, written by the Ministry of Business, Innovation and Employment. Your builder cannot edit it, rebrand it, or add their logo. It is a fixed document covering how to structure a project, hire competent people, handle pricing and set up dispute resolution.
The second is a disclosure statement about the business itself. Per Building Performance’s guidance for contractors, that means the legal entity’s name and type, its address and how long it has been operating, contact details, the key contact person’s qualifications and Licensed Building Practitioner number, what insurance is held and what it excludes, and the terms and duration of any warranty or guarantee offered.
Both documents are free and public. You can download the checklist and the disclosure statement template from building.govt.nz and read them before you ever meet a builder. A contractor who fails to provide them when required faces an infringement fine of up to $2,000, and knowingly supplying false or misleading information in that statement carries a conviction and a fine of up to $50,000 for an individual.
Read the insurance and warranty lines twice. That is the part of the disclosure statement that tells you what happens if something goes wrong, and it is the part almost nobody reads.
What the Contract Itself Has to Cover
A residential building contract in New Zealand is not a free-form document. Building Performance sets out the minimum content, and the list reads like a catalogue of everything renovations argue about.
| What the contract must set out | Why it decides an argument later |
|---|---|
| Expected start and completion dates, and what happens if they slip | Turns a vague verbal timeline into something you can hold, including delays outside anyone’s control |
| The price, or the method used to calculate it | This is where a fixed price and a charge-up arrangement look different on paper |
| A description of the work, materials and products | Named brands and finishes stop a specified product quietly becoming a cheaper equivalent |
| Who gets the building consents and approvals | On Auckland Council jobs this single line saves weeks of nobody lodging anything |
| Who carries out and who supervises the work | Names the responsible LBP where the job includes restricted building work |
| The payment process, stages and invoicing method | Ties money to progress rather than to whoever asks first |
| How variations are agreed | The clause that governs every mid-build change, and the one most worth reading closely |
| How defects get fixed, referencing the Building Act warranties | Sets the process for the 12 months after handover before it is needed |
| The dispute resolution process | Decides the first step you take if the job stalls |
| Acknowledgement that you received the checklist and disclosure statement | Records that the pre-signing obligations were actually met |
Sighted the contract and none of those appear? That is your list of questions, not a reason to panic. Ask for them in writing and see how the answer comes back. If a builder gets uncomfortable at the sight of a checklist, you have learned something useful for the price of one conversation. Our own view on choosing between companies sits in our guide to how to choose a renovation company in Auckland, and the contract questions above work as a filter alongside it.
Quote or Estimate? One Word Decides Who Pays for the Overrun
Two builders send you a price. One calls it a quote. One calls it an estimate. Those are not synonyms, and the difference is worth thousands.
What a Quote Actually Locks In
Consumer Protection, the government’s consumer information service, puts it plainly. A quote is an offer to do a job for a specified price, and once you accept it the provider cannot charge more unless you agree to extra work or a change in scope. An estimate is a different animal: Consumer Protection describes an estimate as the service provider’s best guess based on skill and past experience, and it is not a fixed price. Verbal or written makes no legal difference to an estimate.
There is a guardrail. An estimate is expected to land reasonably close to the figure given, generally within 10 to 15 percent, and a provider cannot deliberately lowball to win the job. Useful to know. Also worth doing the arithmetic: 15 percent of a $90,000 renovation is $13,500 you had not planned for, and that is the accepted range rather than the worst case.
“When a homeowner tells me another price came in much lower, the first thing I ask is what it was priced off. Nine times out of ten it was priced off a conversation, not a drawing and a specification. You cannot fix a price to something that has not been decided yet, so the number moves later instead.”
— Cici Zuo, Certified Designer, Superior Renovations
Allowances, PC Sums and Provisional Sums
A fixed price can still contain soft numbers, and this is where two documents that look alike stop being comparable.
A prime cost sum, usually written PC sum, is an allowance for an item you have not chosen yet. Tiles, tapware, an oven, the vanity. If the allowance is $60 per square metre for tiles and you fall for something at $180, the difference lands on you. A provisional sum covers work whose extent nobody can know yet, which on Auckland’s older housing stock usually means the things hiding behind the linings.
Neither is a red flag. A quote with no allowances at all on a job where the tiles have not been picked is the actual warning sign, because the number has been invented. What matters is whether the allowances are realistic and whether you know which ones they are. Our plain-English list of renovation terms every New Zealand homeowner should know unpacks the rest of the vocabulary a quote arrives wrapped in.
Comparing Two Prices That Were Never Comparable
The cheapest price is usually the least complete one. Not because anyone is being dishonest, but because scope is invisible until you interrogate it. Run both documents past the same questions.
| Ask about | What often sits outside a cheaper price |
|---|---|
| Design and documentation | Concept plans, drawings and specifications, or the consent documentation set |
| Consent fees and council inspections | Lodgement and processing charges, plus the time to manage inspections |
| Project management | Sequencing trades, ordering materials, site supervision and your point of contact |
| Demolition and disposal | Strip-out labour, skip bins, and safe removal where pre-2000 materials are involved |
| Fixtures, fittings and appliances | Whether they are named products or PC sums, and whether installation is included |
| Making good | Patching, scotia, painting the adjoining room the new opening now runs into |
| The real comparison | Same scope, same specification, same inclusions, then compare the totals |
💡 Quick tip: Ask each builder for their exclusions list, not just their inclusions. Inclusions are marketing. Exclusions are where the budget surprises live.
This is the reason we price off a design rather than a walk-through. Since 2021 the first person you sit with at Superior Renovations is a designer rather than a salesperson, which we wrote about in why we put designers in the first meeting. Layout, light and structural constraints get resolved while changing them is still free, and the price that follows is attached to decisions that have actually been made. If you want the full picture of what sits inside a properly scoped Auckland renovation price, that is where our process is set out end to end.
Variations: How a Scope Change Should Reach You
Every renovation has variations. Auckland’s housing stock guarantees it. Pull the lining off a 1920s bungalow wall and you may find borer, an old chimney base, or plumbing that was never quite legal. On a 1970s brick and tile home you might find the shower has been leaking into the framing for a decade.
What separates a well-run job from a bad one is not the absence of surprises. It is how the surprise reaches you.
The Sequence to Insist On
A variation should arrive as a written, priced change that you approve before the work happens. Not as a verbal heads-up on site, and definitely not as a line item on an invoice a month later. The procedure for agreeing variations is one of the items Building Performance requires a residential building contract to spell out, so the mechanism is already meant to be in your document. Find that clause before you sign and check it says what you want it to say.
On our projects every variation is costed and presented for written approval before anyone picks up a tool. It slows a decision down by a day. It also means the number you agreed to at the start is still the number you can plan around, because every movement away from it was a decision you made rather than one you discovered.
“The variations that upset people are almost never about the money. They are about being told after the fact. If we open a wall and find something, the homeowner hears about it that day, with a price and their options, and the job waits for their answer.”
— Dorothy Li, Design Manager, Superior Renovations
There is a project management layer under that promise. We split project management out of sales into its own department in 2019, so one person owns the sequencing, the material ordering and the communication with you and the council for the life of your job. That structure is what makes same-day variation conversations possible rather than aspirational, and it is set out in how our project management department runs a renovation.
💡 Quick tip: Keep a single email thread or shared folder for every approved variation. When you reach the final invoice, that thread is the difference between a five-minute reconciliation and a fortnight of disagreement.
Deposits, Progress Payments and Keeping Money Tied to Work
The payment process, its stages and the invoicing method all have to be in the contract. That requirement is doing more work than it looks like it is doing.
Pay for Progress, Not for Promises
Where a payment schedule exists, each claim should line up with work you can see. Framing done, plumbing roughed in and inspected, linings up, tiling complete. The point is that money moves as value is delivered on your property, not in advance of it. A large deposit before anything arrives on site leaves you carrying the risk instead of the builder.
Some deposit is normal and reasonable, particularly where custom cabinetry or imported tapware has to be ordered and paid for long before installation. There is a difference between funding a specific committed purchase and handing over a big slice of the contract price for nothing you can point at.
Important note: Keep every invoice, receipt, variation approval and consent document together from day one. You will want them for the council sign-off at the end, and again in the unlikely event you need to raise a defect.
If your bigger question is what the whole thing should cost before the paperwork stage, our breakdown of renovation cost per square metre in New Zealand is a better starting point than any quote comparison, and the interest-free options at the end of this page cover the funding side.
What You Are Still Owed After the Last Coat of Paint
Signing is only half the protection. The Building Act keeps working after the site is cleaned up, and it works whether or not anyone wrote anything down.
The 12-Month Defect Repair Period
If defects in the building work appear within 12 months of completion, your builder has an obligation to fix them. Per Building Performance’s guidance on implied warranties and defects, that period applies to residential building work regardless of price. Tell them in writing, keep the record, and give them the chance to come back.
Implied Warranties Run for Up to 10 Years
Building Performance is explicit that the Building Act’s implied warranties apply for up to 10 years regardless of whether you have a written contract or what the contract terms say. They cover work complying with the Building Code, suitable materials, following the plans and specifications, reasonable care and skill, and a home suitable for occupation. A builder cannot contract out of them, which is a rare and useful thing in a commercial document.
The Paperwork Council Needs From You
Where your renovation includes restricted building work, structural changes, weathertightness work or fire safety design, a Licensed Building Practitioner has to be involved. On completion that LBP must give you a Record of Work or a Certificate of Work covering what they did or supervised. You need that document for council sign-off, so chase it before the final payment rather than after.
Whether your project needs consent at all is a separate question, and one to settle with Auckland Council or your LBP rather than from a blog. Our guide to building consent for Auckland renovations sets out how the process runs and where consent is usually required.
If Something Goes Wrong, Work Through It in This Order
Nobody signs a contract expecting to use the dispute clause. Know where it leads anyway.
Start with the process in your own contract, because that is what both parties agreed to. Put the problem in writing, keep it factual, and give a clear description of what you want fixed.
If that does not resolve it, Building Performance sets out the formal options. The Disputes Tribunal hears small claims up to $60,000, with no lawyers involved, which suits a disputed variation or a defect argument. Above that figure, or to enforce a Tribunal decision, you are looking at the District Court.
One detail catches people out: to invoke the Building Act’s implied warranties you have to go to the District Court or High Court, depending on the value of the work. The Tribunal cannot do it for you. That single fact is worth knowing before you decide how hard to push a defect claim, and it is a good moment to get your own legal advice rather than ours.
Important note: This article is general information about how renovation contracts work in New Zealand, not legal advice on your situation. Have a property lawyer read anything you are unsure about before you sign, and take consent and restricted building work questions to Auckland Council or a Licensed Building Practitioner.
Your Renovation Contract Is Just the Renovation, Written Down Early
A good renovation contract is not there to be enforced. It is there because the act of writing everything down forces the decisions that a renovation goes wrong without: what exactly is being built, from what materials, by whom, in what order, for how much, and what happens when the wall comes off and reality is different from the drawing.
Every fixed price we put in front of an Auckland homeowner is built off an approved scope and specification, with variations costed and approved in writing before they happen. You are welcome to come and see how that works in person at our Design Studio at 16B Link Drive, Wairau Valley, with the materials and finishes in front of you rather than on a screen.
➡ Book your free in-home consultation with Superior Renovations
➡ Work out a price range with our free renovation cost calculators
➡ Request a free feasibility report for your project
Renovation Contract FAQs
Do I need a written contract for a renovation in New Zealand?
Yes, if the residential building work will cost $30,000 or more including GST. MBIE's Building Performance guidance requires a written contract with your building contractor at or above that figure, and most Auckland kitchen, bathroom and full-home renovations clear it easily. Below $30,000 a written contract is not compulsory, but Building Performance encourages one anyway. Small jobs with no written scope are exactly where disputes over inclusions and disposal start.
What has to be in a residential building contract?
Building Performance sets a minimum. Both parties' names and contact details, the site address, signature dates, expected start and completion dates and what happens if they slip, the price or how it is calculated, a description of the work and materials, who obtains consents, who does and supervises the work, the payment process and stages, how defects are remedied with reference to the Building Act warranties, the dispute resolution process, how variations are agreed, and your acknowledgement that you received the checklist and disclosure statement.
What is the difference between a quote and an estimate?
Consumer Protection defines a quote as an offer to do a job for a specified price. Once you accept it, the provider cannot charge more unless you agree to extra work or a change of scope. An estimate is their best guess based on skill and experience, and it is not a fixed price. The final figure should stay reasonably close, generally within 10 to 15 percent, and a provider cannot deliberately underestimate to win the work.
Can a builder increase a fixed-price quote partway through?
Not unilaterally. A quote you have accepted is binding on both parties, so the price only moves if the scope moves. That is what a variation is: an agreed change to what is being built, priced and approved before the work happens. If a price rise arrives with no scope change attached, ask which clause of the contract it relies on. Get the answer in writing before you pay it.
What is a PC sum or a provisional sum in a renovation quote?
A prime cost or PC sum is an allowance for an item you have not chosen yet, such as tiles, tapware or an oven. Choose something dearer than the allowance and you pay the difference. A provisional sum covers work whose extent nobody can know until demolition, which on older Auckland homes usually means what is hiding behind the linings. Neither is a warning sign. Not knowing which items are allowances is.
How should variations be handled during a renovation?
In writing, priced, and approved by you before the work proceeds. Building Performance requires the procedure for agreeing variations to be set out in the contract, so read that clause before signing. On our projects every variation is costed and presented for written approval first, and we keep the job waiting on your decision rather than proceeding and invoicing later. Keep all approvals in one thread so the final reconciliation takes minutes.
Should I be given a consumer protection checklist before I sign?
Yes, where the work will cost $30,000 or more including GST, or any time you ask for it. You must receive MBIE's consumer protection standard checklist and a disclosure statement about the business before you sign the contract. The checklist cannot be altered or rebranded. A contractor who fails to provide them when required can face an infringement fine of up to $2,000, and both documents are free to download from building.govt.nz.
How much deposit should I pay before renovation work starts?
There is no fixed legal figure, so judge it against what the money is actually buying. Funding a specific committed order such as custom cabinetry or imported tapware is reasonable. Handing over a large slice of the contract price before anything is on site is not, because it moves the risk from the builder to you. Your contract has to set out the payment process and stages, so check each claim lines up with visible progress.
What warranties cover renovation work in NZ?
Two layers. Any defect that appears within 12 months of completion must be fixed by your builder, and that applies to residential building work regardless of price. Separately, the Building Act's implied warranties run for up to 10 years regardless of whether you have a written contract or what it says. They cover Building Code compliance, suitable materials, following the plans and specifications, reasonable care and skill, and a home suitable for occupation.
What is a Record of Work and why do I need one?
Where your renovation includes restricted building work such as structural changes or weathertightness work, a Licensed Building Practitioner must do or supervise it. On completion they must give you a Record of Work or Certificate of Work covering what they did. Your council needs that document to sign the project off, so chase it before you make the final payment. Whether your job counts as restricted building work is a question for your LBP or Auckland Council.
What can I do if my renovation goes wrong?
Start with the dispute resolution process in your own contract and put the problem in writing. If that fails, Building Performance sets out the formal routes. The Disputes Tribunal hears claims up to $60,000 without lawyers, which suits a disputed variation or defect. Larger claims go to the District Court. Note that enforcing the Building Act's implied warranties has to happen in the District Court or High Court, not the Tribunal. Get legal advice at that point.
Further Resources for your renovation planning
- Featured projects and Client stories to see specifications on some of the projects.
- Real client stories from Auckland
Need more information?
Take advantage of our FREE Complete Home Renovation Guide (48 pages), whether you’re already renovating or in the process of deciding to renovate, it’s not an easy process, this guide which includes a free 100+ point check list – will help you avoid costly mistakes.
Download Free Renovation Guide (PDF)
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References
- MBIE Building Performance — Contracts for your building project
- MBIE Building Performance — Before building work starts
- MBIE Building Performance — Consumer protection: disclosure statement and standard checklist
- MBIE Building Performance — Implied warranties and defects
- MBIE Building Performance — Builder and designer rights and obligations
- MBIE Building Performance — Disputes Tribunal and courts
- Consumer Protection NZ — Quotes and estimates
