Quick answer
Since 15 January 2026 you can put one detached, self-contained dwelling of up to 70m² on a Massey or West Harbour section without a building consent, and in most residential zones without a resource consent either. The kitchen inside it still has to meet the Building Code in full. Restricted building work must be carried out or supervised by an LBP, the water supply and drainage must be done by registered plumbers and drainlayers, and Auckland Council has to issue a Project Information Memorandum before anyone lifts a hammer. If you rent the flat out, the rangehood must duct to the outside — a recirculating one will not meet the Healthy Homes ventilation standard. And if you draw a mezzanine over the kitchen for storage, you have just made it a two-storey building and lost the exemption entirely.
Key points
- The 15 January 2026 change removed the building consent for a detached dwelling up to 70m², but every Building Code clause that touches a kitchen — G3 food preparation, G4 ventilation, G12 water supply, G13 foul water — still applies exactly as it did before.
- A mezzanine or loft floor disqualifies the build outright, so the overhead storage people sketch above the galley has to be designed out before the plans go anywhere near the council.
- Auckland Council must issue a PIM before work starts and has 10 working days to do it, but it will not inspect the build and will not issue a code compliance certificate at the end.
- The exemption allows no pumped systems inside the dwelling, so an island sink has to reach the drain on gravity alone — which is a decision you make before the slab is poured, not when the cabinets arrive.
- If the flat is rented, the Healthy Homes ventilation standard wants a rangehood ducted outdoors at 150mm minimum diameter or at least 50 litres per second, and recirculating units do not comply.
The consent went. The Building Code stayed.
There's a particular kind of section off Don Buck Road, and again up around Marina View Drive: long, a bit of fall at the back, and a rear lawn that has never done anything in its life except get mowed. Since January those lawns have been buildable without a consent queue. The calls coming in have changed shape because of it. Nobody rings to ask whether they can put a flat out the back any more — they ring to ask what goes in the kitchen, and whether the layout they sketched on the back of an envelope is still legal.
Short answer: probably, but not for the reason most people think. The 15 January 2026 change was a consenting change. It removed the building consent, and a separate set of national planning rules removed the resource consent in most residential zones. It did not touch the Building Code — and the Building Code is where every kitchen requirement actually lives. That distinction is the whole article. What follows is about what survived the change, because that's the part that will bite you.
What actually changed on 15 January
Two separate things landed on the same day, and people keep welding them together. Under the Building Act, a new, single-storey, standalone dwelling of 70m² or less can be built without a building consent if it meets the exemption conditions. Under the Resource Management Act, the National Environmental Standards for Detached Minor Residential Units make one detached minor unit per site a permitted activity in residential, rural, mixed-use and Māori-purpose zones, subject to standards — in residential zones that means a maximum 50 per cent building coverage, a minimum two-metre setback from front, side and rear boundaries, and two metres clear of the principal dwelling.
MBIE is explicit that the two regimes operate independently. You can meet the planning standards and still need a building consent, or clear the building exemption and still need a resource consent. Both cap at 70m², which makes it easy to assume they're the same rule wearing two hats. They aren't. Your PIM is where Auckland Council tells you which of the two you've satisfied on your particular site, and district plans are allowed to keep more lenient standards than the national ones — so the answer in Massey is a site-specific answer, not a general one.
| Item | With a building consent | Under the 70m² exemption |
|---|---|---|
| Council approval | Consent granted before you start | No approval — a PIM, which is not an approval |
| Inspections | Council inspects at set stages | Council does not inspect at all |
| Sign-off at the end | Code compliance certificate | None — you file records instead |
| Building Code | Applies in full | Applies in full, unchanged |
| Who carries the liability | Shared with the consent authority | You and your tradespeople |
| Kitchen plumbing | Registered plumber, inspected | Registered plumber, not inspected |
| Development contributions | May apply | May apply — notified via the PIM |
The Building Code clauses that design your kitchen
MBIE's guidance lists the clauses a granny flat has to satisfy, and the G series is the one that lands on us: G1 personal hygiene, G2 laundry, G3 food preparation, G4 ventilation, and G7 to G13 covering water supply, drainage, electricity and gas. G3 is the interesting one, because most people have never read it and it is quietly prescriptive about a domestic kitchen.
G3/AS1 is one way to demonstrate compliance — not the only way — but it's the path of least resistance, and it sets out real numbers. The sink has to be capable of fully containing a solid cylinder 300mm in diameter and 125mm deep, which rules out the fashionable shallow bar sink as the flat's only sink. You need a cooker with an oven and a hot plate, or a wall oven and a separate hob. Preparation surfaces have to be easily maintained in a hygienic condition, and G3/AS1 names stainless steel, decorative high-pressure laminate and tiles as suitable materials. There's even a minimum perishable food store: half a cubic metre for up to two people, one cubic metre for three to five.
| G3/AS1 requirement | What it actually says | What it means for the flat |
|---|---|---|
| Sink | Must fully contain a 300mm × 125mm cylinder | A single bowl is fine; a shallow bar sink alone is not |
| Cooker | Oven and hot plate, or wall oven and separate hob | A benchtop induction plate on its own doesn't get there |
| Prep surfaces | Easily maintained in a hygienic condition | Laminate is named in the Acceptable Solution — it's compliant, not a compromise |
| Food store | 0.5m³ for up to 2 people, 1.0m³ for 3–5 | Rules out the under-bench bar fridge in a two-bedroom flat |
| Clear space | At least 800mm on the operational side | This is what kills the tight galley, not the cabinets |
| Oven door | 600mm clearance where the door swings into that space | Swap to a wall oven, or widen the run |
| Energy source | Permanent gas connection, or connections to electrical outlets | A gas hob needs its own independent gas supply to the flat |
The 800mm rule that quietly decides your layout
Here's the constraint nobody plans for. G3/AS1 requires a minimum clear space adjacent to the facilities, extending at least 800mm on the operational side — and it states that this clear space must not form part of any access route. Read that twice, because in a 70m² flat the kitchen is almost always on the way to somewhere. It's the corridor between the front door and the bedroom, or between the living room and the back deck. The moment your 800mm doubles as a walkway, G3/AS1 stops covering you. The Acceptable Solution says so directly: where an access route passes the operational side, more space will be required, and that situation is not covered.
That doesn't make it illegal. It means you've left the easy path and you're now designing an alternative solution, which someone has to stand behind. Far simpler to design the kitchen so it isn't a thoroughfare — push it into a dead-end galley, or run it along one wall with the traffic passing behind the working side rather than through it. It's the same discipline that makes a small kitchen feel bigger than it measures work in practice, and it's why the first thing we look at on a granny flat plan is where people walk, not where the cabinets go. If you're building for an ageing parent, designing the kitchen so it works for every user belongs at plan stage rather than retrofitting a turning circle later.
The plumbing conditions nobody reads until it's too late
Buried in the exemption conditions is a set of plumbing rules that read like nothing to do with kitchens until you try to draw one. Water supply, sanitary plumbing and drainage have to follow the acceptable solutions for E1, G12 and G13. Beyond that: no more than 30 fixture units, no pumped systems within the dwelling, main drain no less than DN100 at a grade of 1:60, branch drains no less than DN65 at 1:40, and no uncontrolled water heating. The dwelling needs an independent source of supply for electricity, and an independent gas supply if you're using gas.
Three of those matter to the kitchen. The no-pumped-systems rule means your sink has to reach the drain on gravity — so an island with a sink in it is possible, but only if the branch drain gets its DN65 at 1:40 across to the main run, and that gets decided before the slab is poured, not when the cabinetry turns up. The independent gas supply means you can't just spur a gas hob off the main house's line and call it done. And the electricity condition catches people building a rental: the guidance allows homeowners intending to live in the flat to use the domestic exemption under the Electricity Act for certain work during construction, with a licensed electrical inspector checking it. If you're building it to let, ask your sparky where that leaves you.
If you rent it out, Healthy Homes lands on the rangehood
Nothing in the exemption requires your mother-in-law to be the one living in it. It's a self-contained dwelling for a single household, and that household can be a tenant. Plenty of the Massey and West Harbour enquiries are exactly that — a flat out the back that pays for itself. The moment it's a tenancy, though, a second rulebook opens: from 1 July 2025 all private rentals must comply with the healthy homes standards, and the kitchen touchpoint is ventilation.
That standard is specific. In any room with a cooktop, new fans or rangehoods must have a minimum diameter — including the ducting — of 150mm, or an exhaust capacity of at least 50 litres per second. They must vent to the outside. Tenancy Services is blunt that recirculating systems and fans that don't extract outdoors are not suitable to meet the standard, which means the tidy carbon-filter rangehood that saves you a penetration through a new wall is not an option in a rental. The difference between ducted and recirculating extraction is the most common spec mistake we see on small dwellings, and the cheapest to avoid: decide it while the duct run is still a line on paper rather than a hole through finished cladding. The wider set of Healthy Homes obligations that land on a landlord's kitchen is worth reading before you sign a tenancy agreement.
One more from the same standard, because it decides where the kitchen sits: every habitable room needs at least one window, door or skylight that opens to the outside and can be fixed open, with the openable area totalling at least 5 per cent of that room's floor area. On an open-plan 70m² flat, the kitchen and living space are usually one habitable room. Where the joinery goes and where the kitchen goes are the same conversation.
Benchtops in a 70m² flat
Let's clear something up, because there's a lot of copied Australian content floating around. Engineered stone is not banned in New Zealand. Australia banned its manufacture, supply, processing and installation from 1 July 2024; New Zealand did not follow. MBIE has consulted on options ranging from mandatory controls through to licensing and a possible ban, WorkSafe publishes guidance, and the general duties under the Health and Safety at Work Act apply — but there is no New Zealand engineered-stone ban or licensing regime. That position could change, and anyone who tells you it already has is reading the wrong country's news.
Real risk sits in the fabrication, not the finished slab in your kitchen. WorkSafe notes engineered stone can contain in excess of 90 per cent crystalline silica, well above natural stone like granite at under 45 per cent, and that there's minimal risk to people who follow the guidance for working with stone products. Ask your supplier how they cut it — wet cutting, extraction, monitoring — and you've asked the question that matters. For a granny flat, laminate earns its place: G3/AS1 names it as a suitable prep surface, it's materially cheaper, and the money is better spent on extraction and appliances. The full comparison of laminate against stone on cost and value sets out where the step-up is worth paying for. Putting a premium stone-and-2-pac kitchen into a flat out the back at Massey is money you'll never see again at the rent review.
The ones that go wrong are the ones where someone measured off the plan and ordered. On a granny flat the walls move — they always move. You measure when the linings are on, or you eat the difference.
Work starts after the PIM, not before.
What goes wrong
Failure modes on these builds are consistent, and almost none of them are about cabinetry. The most expensive is the mezzanine — drawn in late, usually by an owner who found some spare stud height, and it collapses the exemption for the entire dwelling. Second is the 70m² itself. Floor area means the overall internal dimensions measured between the finished internal faces of the external walls, and an attached or internal garage counts inside that 70m². People design to 70m² of living space, add a garage, and quietly build something that needs a consent.
Then there's the timing. Building work cannot start until the PIM has been issued, and the build has to be complete within two years of the PIM issue date or the PIM lapses. Owners project-managing their own flat treat the PIM as a formality to be caught up with later, then discover their sequencing was never legal. No consent also means no inspections and no code compliance certificate: nobody is coming to catch your mistakes. The guidance is direct that responsibility for Building Code compliance rests with you and the people doing the work, and that you could be liable if something goes wrong. That's the trade you made for the speed.
Last is measurement, and it's the one that costs the programme. Granny flats get built fast, often by small crews, and the as-built rarely matches the drawing to the millimetre. Order cabinetry off the plan and you'll find the run is 15mm short at the fridge and the filler panel is doing work it was never meant to do. We measure on site rather than off the plan for exactly this reason — on a new build, once the framing and linings are in and the openings are real. Same discipline as the new builds around the corner at Hobsonville Point, where the tolerances are tight and the programme has no slack in it.
What to ask before you sign
- Has the PIM been issued, and what did Auckland Council's additional information document say about whether the build is likely, unlikely or unclear to meet the exemption criteria?
- Does the 70m² figure on the plan include the garage, measured between the finished internal faces of the external walls?
- Is there anything on the drawing that reads as a part-storey or mezzanine, including a high storage platform?
- Where does the kitchen waste run, and does it get DN65 at 1:40 to the main without a pump?
- If there's a gas hob, is there an independent gas supply to the flat, and who's issuing the gas safety certificate?
- Is the rangehood ducted to the outside at 150mm or 50 litres per second, and is the penetration on the elevations?
- Does the 800mm clear space in front of the kitchen double as the walkway to anywhere?
- Who is providing the Records of Work and Certificates of Work, and who is filing them within 20 working days of completion?
- Is the kitchen quoted supplied and installed under one contract, or are you coordinating a supplier and an installer yourself?
Frequently asked questions
Do I need a building consent for a granny flat kitchen in Auckland?
Not if the whole dwelling qualifies under the granny flats exemption that took effect on 15 January 2026 — a new, single-storey, standalone, self-contained dwelling of 70m² or less that meets all the exemption conditions. The kitchen itself doesn't need its own consent, but it still has to comply with the Building Code, including G3 for food preparation and G4 for ventilation. Restricted building work must be carried out or supervised by an LBP, and the plumbing and drainage must be done by registered plumbers and drainlayers. Confirm your specific site with Auckland Council through the PIM before you order anything.
Can I put a mezzanine or storage loft in a 70m² granny flat?
No — not and keep the exemption. The exemption requires a single storey only, without a part-storey or mezzanine floor, so a loft counts as another storey and disqualifies the entire dwelling from the exemption, not just the loft. If you want a mezzanine you'll need to apply for a building consent for the whole build in the normal way. If you just want the storage, take it out of the cabinetry instead — full-height pantry units and deep drawers will hold more than a loft you'd need a ladder to reach.
Does a granny flat kitchen need a ducted rangehood?
If you're going to rent the flat out, effectively yes. The Healthy Homes ventilation standard requires that any room with a cooktop has an extractor fan or rangehood venting to the outside, and for units installed after 1 July 2019 it must have a minimum diameter including ducting of 150mm, or an exhaust capacity of at least 50 litres per second. Tenancy Services states that recirculating systems and fans that don't extract outdoors are not suitable to meet the standard. If you're living in it yourself the Healthy Homes standards don't apply, but the Building Code's ventilation requirements still do — and ducting it is the right answer regardless.
Can I rent out a granny flat built under the exemption?
Yes. The exemption is for a self-contained dwelling intended for a single household, and it doesn't require that household to be related to you — MBIE's own framing covers residential use including multigenerational living, and a tenant is a household. What changes is that a tenancy brings the healthy homes standards with it, and from 1 July 2025 all private rentals must comply. The ventilation standard is the one that lands on the kitchen, so budget for ducted extraction from the start rather than discovering it at the first tenancy.
Can I have an island with a sink in a 70m² granny flat?
Physically yes, but the exemption makes it a decision you have to get right early. The conditions allow no pumped systems within the dwelling, so the island sink has to drain to the main run on gravity — branch drains no smaller than DN65 at a grade of 1:40 — which has to be set out before the slab is poured. There's also the G3/AS1 clear-space rule to think about, because an island in a 70m² footprint usually eats the 800mm you need on the operational side. In most granny flats a peninsula or a single wall run with a good pantry beats an island on both compliance and usable space.
Send us the plan and we'll price the kitchen
We build kitchens out of our own workshop in East Tamaki — twenty-three years, more than two thousand kitchens, ten-plus going out the door most weeks. Granny flats suit how we work: one contract, one invoice, supply and install together, so there's nobody to blame in the gap between the cabinetmaker and the installer. There's no showroom, which is why the pricing is trade pricing. A kitchen installs over five to seven days once the site's ready, and we're Site Safe qualified — which matters if you've got a builder running the site under a head contract.
Send through whatever you've got — a drawing set, the PIM plan, or the sketch off the back of the envelope with the rough dimensions on it. We'll price off a rough scope and sharpen it when the drawings firm up, and you'll have a trade-priced number back inside 24 hours. If the plan has a mezzanine on it, or an island sink a long way from the drain, or a recirculating rangehood in a flat you're letting, we'll tell you before you order rather than after. That conversation costs nothing.