Quick answer
Usually not. A like-for-like sink swap in the same position needs no building consent, and shifting a sink a short distance within the same kitchen can also be consent-exempt under Schedule 1 of the Building Act 2004 — as long as you do not add a fixture, do not modify a specified system, and do not cut into structure. But consent-exempt is not the same as do-it-yourself. Sanitary plumbing is restricted work in New Zealand, so a licensed plumber or drainlayer has to do the pipework and hand you a Certificate of Compliance. Add a second sink, run new drainage across the room, or open up a load-bearing wall, and you tip into building-consent territory, sometimes with a Licensed Building Practitioner and a Record of Work as well. Confirm the specifics with your council and your plumber before you order a benchtop.
Key points
- Swapping a sink for a comparable one in the same spot is exempt from building consent because it is repair, maintenance and replacement under Schedule 1.
- Moving a sink within the same kitchen without adding a fixture or touching structure can fall under the alteration-to-existing-sanitary-plumbing exemption, so it often needs no consent either.
- Adding a second sink, or moving the drainage far enough to affect structure or a specified system, generally pushes the job into needing a building consent.
- Consent or no consent, the pipework is restricted work — a licensed plumber or drainlayer must do it and issue a Certificate of Compliance.
- Records of Work come from Licensed Building Practitioners when structural restricted building work is involved, which is a separate signature from the plumber's.
The question is: does anything actually change?
You are standing in a Mount Eden bungalow with a plan drawn on the back of an envelope. The old kitchen ran along the outside wall, sink under the window, and you want to pull it into an island so someone can wash dishes facing the lounge. It looks like a small change. It is not a small change to the plumbing, and that is where the consent question actually lives. Most people ask whether they need consent to renovate a kitchen. The sharper question is whether they need consent to move water and waste, because a refit that leaves the sink where it is behaves very differently under the rules than one that walks it four metres across the floor.
So this piece stays narrow. It is about the sink — the tap supply, the waste, the drainage, and the paperwork that follows the pipework. It is written for Auckland renovators, landlords and small developers, and it leans on Schedule 1 of the Building Act 2004, on the Plumbers, Gasfitters and Drainlayers Act, and on the guidance published at building.govt.nz. None of it is legal advice, and none of it beats a five-minute call to your local council and a good plumber before you commit. Rules get read case by case, and the person who signs the Certificate of Compliance is the one carrying the risk.
Two rulebooks, not one
The single thing most people get muddled is that a moved sink is governed by two separate systems answering two separate questions. The first is the building consent regime under the Building Act 2004, run by your council: does this physical work need council sign-off before it happens? The second is the licensing regime under the Plumbers, Gasfitters and Drainlayers Act 2006, run by the PGDB: who is legally allowed to touch the pipes? You can be exempt from the first and still firmly caught by the second, and that is the usual outcome for a kitchen sink — no consent needed, but a licensed plumber required. People hear "no consent" and assume they can pick up the spanner themselves. That assumption is how a tidy renovation ends up with a leak nobody will warrant and a sale that stalls at the LIM.
Keep the two questions apart. Consent is about the work; licensing is about the worker. The paperwork at the end — a Certificate of Compliance from the plumber, a Record of Work from a Licensed Building Practitioner if structure is involved, a code compliance certificate if the job was consented — is how each system proves its box was ticked.
When you do not need a building consent
Schedule 1 of the Building Act lists building work that can be done without a consent, and two entries carry most kitchen sinks. The first is repair, maintenance and replacement of sanitary plumbing and drainage. If you pull out a tired sink and drop in a comparable one in the same position, using comparable pipework, that is replacement and it is exempt — the classic like-for-like swap. The second is the alteration to existing sanitary plumbing exemption. This one lets you alter existing sanitary plumbing without consent provided the total number of sanitary fixtures in the building is not increased, no specified system is modified or affected, and the work does not adversely affect structural elements. It excludes water heaters. In plain terms, you can often shift a sink around within the same kitchen, keeping the same number of fixtures, without a building consent.
That is why moving a sink onto an island bench sized properly for a working kitchen is a maybe rather than a yes-or-no. If the drainage can reach the island without cutting into a load-bearing wall or a floor structure, and you are not adding a second bowl, you may well be inside the alteration exemption. If reaching the island means notching joists, running a long new waste under a suspended floor, or crossing into structure, you are on the other side of the line. The exemption does the heavy lifting, but it has hard edges, and a good plumber will tell you which side you are on before the gib comes off.
| Scenario | Building consent? | Licensed plumber / drainlayer? | Paperwork you should get |
|---|---|---|---|
| Swap the sink for a comparable one, same hole, same spot | No — replacement exemption | Yes | Certificate of Compliance |
| Shift the sink within the kitchen, same fixture count, no structure touched | Usually no — alteration exemption | Yes | Certificate of Compliance |
| Move the sink onto a new island needing new drainage | Often yes | Yes | Consent, CoC, code compliance certificate |
| Add a second prep or scullery sink | Yes — extra sanitary fixture | Yes | Consent, CoC |
| Run a waste line through a load-bearing wall or floor joists | Yes — structural | Yes, plus an LBP | Consent, Record of Work, CoC, CCC |
When you do need a building consent
Three triggers push a moved sink into needing a consent, and it usually only takes one. The first is adding a fixture. A prep bowl in the scullery or butler's pantry is a second sanitary fixture, and once you increase the fixture count the alteration exemption no longer applies. The second is structure. If getting the waste or supply to the new position means cutting, notching or removing anything that carries load — a load-bearing wall between the old kitchen and the new open-plan space is the classic Auckland one — you are into restricted building work and you need consent plus a Licensed Building Practitioner. The third is a specified system or a significant drainage change, where the council needs to confirm the water supply and foul-water drainage still meet the Building Code.
This is where an early conversation saves a fortune. Opening up a wall to swing the kitchen into the living room is a lovely result and a genuinely different job from a plumbing point of view, the same way taking out a load-bearing wall for an open-plan kitchen is a structural exercise long before it is a joinery one. If your sink move rides along with structural work, treat the whole thing as consented from day one and let the LBP and the plumber each carry their part. The alternative — starting exempt, then quietly cutting a joist because the waste would not fall otherwise — is exactly how people end up with unconsented work that surfaces at sale time.
Who can legally do the work
Sanitary plumbing and drainlaying are restricted work in New Zealand. A licensed plumber or drainlayer has to do the pipework, or it has to be done by someone under the proper supervision of one. There is a narrow owner-occupier exemption that lets a homeowner do a short list of minor maintenance on the home they actually live in, and it is genuinely short: replacing tap washers and O-rings, changing a showerhead on an existing arm, swapping a flexible hose connector under the sink where there is no hard pipe work. That is roughly the boundary. The moment you are connecting into the water supply or moving a waste — which is most of what "moving the sink" means — you are past the exemption and into work a licensed person must do.
The exemption does not apply to rentals, investment properties or commercial buildings — landlords do not get to DIY the plumbing on a rental even for tasks a live-in owner could. So a full mixer tap replacement that ties into the supply is licensed plumber territory in a tenanted flat regardless of how simple it looks, and unlicensed sanitary plumbing carries real penalties under the Act. If you are refreshing a portfolio, price the plumber in from the start.
| Task | Homeowner may do it (own home lived in)? |
|---|---|
| Replace a tap washer or O-ring | Yes — minor maintenance |
| Replace a flexible hose connector under the sink | Yes, where there is no hard pipe work |
| Replace a showerhead on an existing arm | Yes |
| Replace a mixer tap connecting into the water supply | No — licensed plumber |
| Move or extend the sink waste or supply pipework | No — licensed plumber / drainlayer |
Half my callbacks on kitchen moves are people who thought no consent meant no plumber. The sink looks fine for a fortnight, then the join under the cabinet weeps and there is no certificate to chase.
Who signs off, and what they hand you.
Records of Work, Certificates of Compliance and the paper trail
The terms trip people up, so keep them straight. A Certificate of Compliance is what the plumber or drainlayer gives you for the restricted plumbing work — it names the licensed person, their number, the location and what they did, and it is your evidence the pipework was done properly by someone allowed to do it. A Record of Work is a different animal: it comes from a Licensed Building Practitioner, and it applies when the job involved restricted building work, which is the structural and weathertightness work that is critical to a home. On completion, each LBP who carried out or supervised that restricted building work must give a Record of Work to both you and the council. So a straightforward sink shift gives you a Certificate of Compliance and no Record of Work; a sink shift that rode along with opening a load-bearing wall gives you both.
There is one crossover worth knowing. Under the granny-flat and small standalone dwelling exemption that came in during 2026, plumbing and drainlaying on a non-consented dwelling is documented on a specific Record of Work form and notified to council on completion, which is a different flow from a normal consented build. If your sink move is part of a minor dwelling built under the new exemption, that documentation path matters and is worth confirming with your council up front. For a standard kitchen inside an existing house, the Certificate of Compliance is the piece you must not lose.
What goes wrong
The failures cluster in a few predictable places. The first is the drainage fall. A sink can be moved anywhere on paper, but waste needs a gradient to run, and a long shift across a slab-on-ground floor with no room to drop the pipe is the reason plenty of island dreams quietly die on site. Find the fall before you commit to the layout, not after the cabinets are built. The second is the joist you were not meant to touch. Someone runs the new waste the short way and notches a floor joist to get it there, turning an exempt plumbing job into unconsented structural work without realising it — and it only shows up when the floor bounces or the sale falls over.
The third is fixture-count creep. The plan starts as one relocated sink and grows a scullery prep bowl during design, and nobody re-checks that the extra fixture has just voided the alteration exemption and pulled a consent into scope. The fourth is the missing certificate: the work was done fine by a licensed plumber, but no one asked for the Certificate of Compliance, so there is nothing to hand a buyer. The fifth is the slow leak that weeps behind a kickboard for months, and by the time anyone notices the early signs of water damage under the sink, the carcass base and the flooring are gone. None of these are exotic. They are the ordinary cost of treating a plumbing move as a joinery detail.
- Ask whether the new sink position keeps the same fixture count, or whether you are adding a bowl and triggering consent.
- Ask the plumber to confirm the waste can achieve fall to the new position before the layout is locked.
- Ask whether reaching the new position touches any load-bearing wall, joist or floor structure — that is the LBP and consent trigger.
- Ask whether the work is exempt under Schedule 1 or needs a building consent, and get that in writing from whoever is signing.
- Ask for the Certificate of Compliance on completion, and a Record of Work as well if any structural restricted building work was involved.
- If you are on a cross-lease or unit title, confirm whether body corporate or co-owner approval is needed for the drainage change.
Frequently asked questions
Can I move my kitchen sink myself in New Zealand?
No, not the plumbing part. Moving a sink means connecting into the water supply and altering the waste, which is restricted sanitary plumbing that a licensed plumber or drainlayer must carry out. The narrow owner-occupier exemption only covers minor maintenance like tap washers, showerheads and flexible hose connectors on the home you live in. Doing the pipework yourself is unlicensed work and, on an exempt job, it also voids the exemption.
Do I need a building consent to move a kitchen sink a metre along the same wall?
Usually not, if you keep the same number of sanitary fixtures, do not modify a specified system, and do not affect any structure. That situation typically falls under the Schedule 1 alteration-to-existing-sanitary-plumbing exemption. The pipework still has to be done by a licensed plumber who issues a Certificate of Compliance. Confirm the specifics with your council, because it is read case by case.
Does adding a second sink change whether I need consent?
Yes. Adding a prep or scullery bowl increases the total number of sanitary fixtures, which takes the job outside the alteration exemption that relies on the fixture count staying the same. That generally means a building consent is required. A licensed plumber is required either way, and you should still receive a Certificate of Compliance for the plumbing work.
What is the difference between a Record of Work and a Certificate of Compliance?
A Certificate of Compliance comes from the licensed plumber or drainlayer and certifies the restricted plumbing or drainlaying work. A Record of Work comes from a Licensed Building Practitioner and applies to restricted building work, which is the structural and weathertightness work in a home. A plain sink move gives you a Certificate of Compliance; a sink move that involved altering structure gives you both, and the council may also issue a code compliance certificate if the job was consented.
Is engineered stone benchtop involved in the sink allowed in New Zealand?
Yes. Engineered stone is legal to buy, fabricate and install in New Zealand — Australia banned it in 2024, but New Zealand did not follow. The issue here is respirable silica dust during cutting, which is a workplace health-and-safety matter for the fabricator under the Health and Safety at Work Act, not a ban. The position could change if regulators act, so it is worth checking current guidance, but a stone benchtop around a relocated sink is not itself a consent question.
Where MTN fits, and how to get a straight answer
We build kitchens at our own workshop in East Tamaki and install them across Auckland under one contract and one invoice, so when a sink moves we coordinate the joinery with the licensed plumber rather than leaving you to referee between trades. That matters more on a sink move than almost any other change, because the layout, the fall on the waste and the consent question all have to agree before the cabinets are cut. Get that sequence right and it is the difference between a five-to-seven-day install and a job that stalls waiting on a certificate or a variation. It is worth reading how the whole thing runs from order through to install so the plumbing decision lands early instead of on site.
Send us the scope — how many kitchens, whether the sink stays put or moves, and whether there is any structural work in the mix — and we will get a trade-priced number back inside 24 hours, plus GST on supply-and-install. If you are not sure which side of the consent line your sink sits on, tell us the layout you are chasing and we will flag it honestly, point you to what your council and plumber need to confirm, and price it once the question is settled rather than guessing. A rough scope is enough to start; drawings sharpen it.