Can You DIY an Auckland Bathroom Renovation? What NZ Law Lets You Do Yourself
Quick answer: In your own home you may legally replace or repair taps, ball valves, tap washers and plugs, and you may do a defined list of electrical wiring work provided a licensed electrical worker tests, certifies and connects it. Almost everything else in a bathroom that involves a pipe is restricted to an authorised plumber or drainlayer. The part with no licence class at all is the waterproofing, which is also the part most likely to cost you $30,000 later.
There is a specific kind of Saturday morning where a bathroom looks very beatable. The vanity is dated, the shower liner is yellowing, the tiles were somebody’s idea in 1998. You have a multi-tool, YouTube and a free weekend, and the quotes you have been given feel like a lot of money for a small room.
So you search it, and the results are all budget ideas and beginner’s guides. Google’s own “people also ask” box surfaces the real question — can I renovate my own bathroom in NZ — and nothing on the page actually answers it. Not with the law. Not with what the council does when you get it wrong.
We renovate bathrooms across Auckland, and we get asked this constantly, usually by people who are entirely capable of doing the work and simply want to know where the line sits. This guide draws that line, from the legislation, the regulator and Auckland Council’s own published rules. It is not a pep talk in either direction.
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Three Rulebooks, Not One
The mistake almost everyone makes is treating “do I need consent?” as the whole question. It is one of three, and they are administered by three different bodies that do not talk to each other about your bathroom.
- Who is allowed to do the work. Set by the Plumbers, Gasfitters, and Drainlayers Act 2006 for anything involving a pipe, and by the Electricity Act 1992 for anything involving a circuit. Nothing to do with your council.
- Whether the work needs a building consent. Set by Schedule 1 of the Building Act 2004 and applied by Auckland Council.
- Whether the finished work complies with the Building Code. This one applies no matter what. The Plumbers, Gasfitters and Drainlayers Board puts it plainly on its consumer page: all work carried out at your property must meet the requirements of the Building Code, regardless of whether it requires a code compliance certificate or not.
That third point is the one that catches people. No consent required does not mean no standard applies. It means nobody is coming to check, and you carry the consequence when it leaks.
These three rulebooks also interact in a way that is genuinely counterintuitive, and we will get to it in a moment, because it is the single most expensive thing a DIY bathroom can do to you.
Plumbing: The Exemption That Is Not What You Think
What counts as sanitary plumbing
Section 6 of the Plumbers, Gasfitters, and Drainlayers Act 2006 defines sanitary plumbing very broadly. It is the work of fixing or unfixing any sanitary fixture or appliance and its fittings, any trap, waste or soil pipe, ventilation pipe or overflow pipe, and any pipe that supplies water to a fixture within the boundary of the property. It closes with a catch-all: generally all plumbing work associated with any sanitary fixture or appliance.
Read that again with a bathroom in mind. Unbolting your old toilet is fixing or unfixing a sanitary fixture. So is lifting out the vanity, so is pulling the shower mixer off the wall. Under section 8, a person must not do any sanitary plumbing, or assist in doing any sanitary plumbing, unless authorised.
The four things the Act carves out
Section 6(2) lists work that is not sanitary plumbing, and it is a shorter list than most people hope for. The ones that matter in a bathroom:
- Repairing or replacing taps, ball valves, tap washers or plugs. This is the real homeowner allowance, and it is the one the Board itself points consumers to.
- Fixing or unfixing a shower that is installed over a bath and supplied with water through the bath taps. A bath mixer with a shower rose on it is out of scope. A separate shower is not.
- Fixing or unfixing a dishwasher or washing machine, but only where no waste pipe or water supply pipe work is involved.
- Work on fixtures in a ship, boat, aircraft or vehicle, which is not much help in a bathroom.
That is the list. Everything else in the room that touches a pipe sits inside section 8.
The householder exemption, and the condition attached to it
Here is where the internet gets it wrong. Section 15 of the Act is headed “Exemption for householders”, and subsection (1) reads that the owner of premises occupied as a residence for that person or their family may do any sanitary plumbing in those premises. That sounds like a complete answer, and it is quoted on forums as though it were.
Two things sit underneath it.
First, subsection (2) allows you the help of a member of your family living with you, and nobody else. Your brother-in-law who is good with tools is not covered, and your mate who owes you a favour is not covered.
Second, and much more significantly, subsection (4) says the exemption applies only “in the places that the Minister determines after consultation with the appropriate local authority”. It is not a nationwide right. It is a right that switches on where a Minister has designated it. The New Zealand Legislation website’s own note under section 15 states that there is no secondary legislation made under that section currently on the site.
We are a renovation company, not a law firm, so we will not tell you what that means for your address. What we can tell you is what the regulator publishes. On the Board’s advice for consumers page, under the heading “Can I DIY plumbing?”, the answer is two short lists. You can install appliances such as dishwashers and washing machines, and replace or repair taps, ball cocks and plugs. You cannot undertake any work involved in fixing or unfixing any pipe, plumbing fixture or appliance, including any trap, waste or soil pipe, ventilation pipe, overflow pipe, or any pipe that supplies or is intended to supply water.
The householder exemption does not appear on that page at all. If you are relying on it for your bathroom, ring the Board on 0800 743 262 and ask about your property before you buy a single fitting.
There is a supervised route
Section 19 is the provision worth knowing about. You may do sanitary plumbing if the work is carried out under the supervision of someone holding a current practising licence authorising them to supervise it, and the work is tested by that supervisor to confirm it was done competently and complies with the regulations under the Act and under the Building Act.
That is a real arrangement, not a loophole. It is also a conversation to have with a plumber before demolition day, not a phone call you make on Sunday afternoon with the wall open.
💡 Quick tip: Drainlaying has no householder exemption of any kind. Section 10 restricts it outright, and the only relief is the supervised route. If your bathroom plan involves the gully trap, the connection to the sewer or anything below the floor, that is drainlayer territory from the first shovel.
The Trap: DIY Plumbing Can Delete Your Consent Exemption
This is the part that is worth the whole article.
Most standard bathroom renovations do not need a building consent. Auckland Council publishes the list on its kitchen and bathroom home renovations page. You are unlikely to require consent to reposition or replace sanitary fixtures such as a bath, bidet, wash hand basin, shower or toilet pan within an existing bathroom, to move a toilet pan from a toilet compartment into an adjacent existing bathroom, to replace or alter wall and floor linings and finishes including tiled shower linings and other wet-area finishes, or to remove a bath with a shower over it and replace it with a proprietary shower enclosure and a new bath in the same space.
That is a generous list. It is also conditional, and the condition is stated at the top of the page rather than buried: “An authorised person must be employed to carry out the plumbing and drainage building work for it to have building consent exemption. If an authorised person does not complete the work, then it is not exempt.”
Auckland Council then defines who counts. Registered certifying plumbers and drainlayers. Plumbers and drainlayers with a provisional licence working under supervision. Trainee plumbers and drainlayers working under supervision. A homeowner doing their own work is not on that list.
MBIE’s guidance says the same thing from the other direction. On its page for Schedule 1 exemption 32, the field headed “Legally required professional” reads: Authorised Plumber. The worked example MBIE gives is a homeowner replacing an existing vanity with a comparable one in the same position — exempt from consent, and still naming an authorised plumber as the required professional.
The wording in the Act itself points the same way. Schedule 1 of the Building Act 2004 puts the plumbing exemptions in Part 2, and Part 2 is headed “Sanitary plumbing and drainlaying carried out by person authorised under Plumbers, Gasfitters, and Drainlayers Act 2006”.
So the sequence runs like this. You do the pipework yourself. The work was not done by an authorised person. The Schedule 1 exemption you were relying on does not apply. Work that would have needed no consent at all now sits outside a consent it never had. Nobody stops you on the day. It surfaces when you sell.
What the council charges when a non-approved installer does the work
Auckland Council publishes the fees for minor plumbing alterations, and they price the distinction openly on the minor plumbing alterations page. For work valued under $5,000, a minor plumbing consent with a producer statement from a certifying plumber is a fixed fee of $354, non-refundable, with no additional charges. The same work completed by someone who is not an approved installer is the same $354 fixed fee plus one inspection fee of $201.
That is the cost of the council needing to come and look, because nobody with a licence has signed for it.
Maximum fine for doing restricted work without authorisation (individual)
Set by statute, not by the council. These are ceilings a court may impose, not standard penalties.
Sanitary plumbing or drainlaying — PGD Act 2006, s 123(1)
Prescribed electrical work — Electricity Act 1992, s 162
Gasfitting — PGD Act 2006, s 123(2)
Body corporate maximums are higher: $250,000 for gasfitting and for prescribed electrical work. The Electrical Workers Registration Board notes it proceeds with roughly 8 to 12 prosecutions a year and prosecutes where there is strong evidence of unlicensed work carried out for reward.
Two things about that chart are worth saying out loud. The plumbing ceiling is the lowest of the three, which tells you something about where Parliament put the safety risk. And the electrical and gasfitting numbers are five times higher, which is why the next section is shorter and firmer.
Electrical: A Real DIY Route, With A Licensed Person At Both Ends
Electrical is the one area where New Zealand law gives a homeowner a genuine, nationwide, written-down allowance. It is narrower than people assume and it has a hard condition on the end of it.
Section 79 of the Electricity Act 1992 lets the owner of premises occupied as their own residence do electrical wiring work in those premises, but only if all of the following hold. The work is within the limits set by regulation. It is carried out in accordance with the regulations. It is carried out competently and safely. No part of it is connected to a power supply while it is being done. And, before connection, it is tested and certified by a registered person holding a current practising licence authorising them to test and certify prescribed electrical work — who then makes the connection themselves.
Regulation 57 of the Electricity (Safety) Regulations 2010 sets the limits. The installation must have a maximum demand at or below 80 amperes per phase single-phase, or 50 amperes per phase multi-phase, which covers an ordinary Auckland house. The permitted work is a specific list:
- Removing and replacing fuse links
- Connecting and disconnecting fixed-wired appliances
- Relocating existing switches, socket-outlets and lighting outlets supplied by tough plastic-sheathed cable
- Removing and replacing switches, socket-outlets and light fittings, permanent connection units, ceiling roses, cord-grip lampholders and their flexible cords, batten holders, water heater switches, thermostats and elements — but only where the work does not involve work on a switchboard
- Installing, extending and altering subcircuits including submains, but only where you do not enter any enclosure where live conductors are likely to be present, and the work is tested and certified to Part 2 of AS/NZS 3000 before connection by a person authorised to inspect mains work
Regulation 57 also requires the work to be carried out and tested in accordance with ECP 51, the Electrical Code of Practice for homeowner and hobbyist work.
What this means for a bathroom is specific. Relocating an existing light or switch on tough plastic-sheathed cable is on the list. Swapping the extractor fan as a fixed-wired appliance is on the list. Running a new circuit for underfloor heating is a subcircuit, which is on the list but carries the inspection and certification requirement. Anything at the switchboard is off the list entirely.
And a bathroom is not a bedroom. Wet areas carry zone rules under AS/NZS 3000 that govern what fitting may sit where relative to a bath or shower, which is exactly the kind of detail that makes the certifying electrician’s visit non-negotiable rather than a formality.
Waterproofing: The Part You Can Legally Do, And The Part You Should Not
Now the genuinely strange one.
Restricted building work is the category that must be carried out or supervised by a Licensed Building Practitioner. The Building (Definition of Restricted Building Work) Order 2011 defines it, and clause 5 is narrower than its reputation. Work is restricted building work only where it is construction or alteration of the primary structure or the external moisture-management system of a house, and it is one of five kinds of work: bricklaying or blocklaying, carpentry, external plastering, foundations, or roofing.
Waterproofing a shower is none of those five. Neither is tiling. And there are seven LBP licence classes — design, carpentry, roofing, external plastering, bricklaying or blocklaying, foundations, and site — with no class for waterproofing and no class for tiling.
So the single highest-consequence element of a bathroom is not licensed work in New Zealand. No licence exists to hold. That is not a loophole anyone should feel pleased about finding.
What the Building Code still requires
Clause E3 of the Building Code covers internal moisture. MBIE summarises it as: surfaces in wet areas must be impervious, easily cleaned, and have ventilation to meet conditions for health and safety. Its provisions apply to habitable spaces, bathrooms, laundries and other spaces where moisture may be generated or accumulate, and they cover thermal resistance, space temperature, ventilation, disposal of overflow water, and impervious, easily cleaned surfaces.
Read that against the first section of this article. E3 applies whether or not your bathroom needs a consent. The standard does not move because nobody is inspecting.
The durability clause that closes the back door
There is one more provision that specifically catches the leaking-shower job, and almost nobody knows it is there.
The Schedule 1 exemptions for repair, maintenance and replacement — clause 1 in Part 1 and clause 32 in Part 2 — both carve out the same thing. The exemption does not include repair or replacement, other than maintenance, of any building product or assembly that has failed to satisfy the provisions of the building code for durability. MBIE’s worked example of work that needs consent is replacing a leaking potable water supply pipe that has failed to meet its durability requirement.
Apply that to the most common reason a bathroom gets ripped out in the first place. If your shower is being redone because the membrane failed, you are not doing repair and maintenance under the exemption. You are replacing something that failed its durability requirement, and that is exactly the case the exemption excludes. Ring Auckland Council’s building helpdesk on 09 301 0101 before you assume otherwise.
💡 Quick tip: Auckland Council flags two situations where a bathroom that would otherwise be exempt tips back into needing consent. One is where sanitary plumbing work could adversely affect the performance of structural elements such as floor joists or wall framing — which is what notching a joist to take a waste run does. The other is alterations in terraced housing, apartment units, or areas with tiled floor finishing. If either describes your project, ask before you start.
The Owner-Builder Exemption Hardly Anyone Uses
If your bathroom project does need a consent and does involve restricted building work — new framing for a relocated wall, a structural opening, carpentry that touches the primary structure — there is a route most homeowners have never heard of.
Auckland Council sets it out on its page about building work you can do yourself. Owner-builders may carry out certain restricted building work on their own homes, provided they meet the requirements of the Building Act 2004 and comply with the approved building consent.
You are an owner-builder if you live in or are going to live in the home, you carry out the restricted building work yourself or with help from unpaid friends and family, and you own or have a legal or beneficial interest in the land or building.
The conditions that come with it
- It is for genuine owner-occupiers. It cannot be used for a home built or renovated mainly for sale or for rent. A holiday home you stay in occasionally is fine.
- The three-year rule. You may do restricted building work on the same property as many times as you like. You may only do it on a different property once three years have passed since you completed restricted building work on the previous one. That restriction exists so unlicensed builders cannot use the exemption instead of getting licensed.
- It does not cover electrical, gasfitting, plumbing or drainlaying unless you hold the appropriate licence. Those still have to be done by licensed professionals who can certify the work.
- Anyone you pay must be an LBP and must provide a Record of Work for the restricted building work they carry out or supervise. Unpaid friends and family are the only other hands allowed.
- A statutory declaration is required before any restricted building work begins, witnessed and signed by an authorised person such as a Justice of the Peace or a solicitor. If you know at consent-application stage, it goes in with the application. If not, it still has to be completed before work starts, submitted with a notice of owner-builder.
- You must notify the council if the scope of restricted building work changes, if you stop working as an owner-builder, or if an LBP is engaged to finish or supervise. That is the owner-builder notice, form 2C.
And the part that follows the house
Auckland Council records who carried out the restricted building work, and whether it was an owner-builder or an LBP, on the property’s Land Information Memorandum. Future buyers can see it.
That is not a reason to avoid the exemption. It is a reason to be honest with yourself about the standard of your own carpentry, because the disclosure is permanent and a buyer’s lawyer reads the LIM before your kitchen gets a look in. It is the same reason we tell clients that the paperwork at the end of a renovation is worth more than most people think — a point we cover in our guide to renovation aftercare and handover documents.
What Changed On 7 September 2026
Twelve days before this guide was written, the rules on the professional side of the decision changed, and it is worth knowing because it narrows the cost gap that makes DIY attractive.
Self-certification for plumbing and drainlaying started on 7 September 2026, under the Building and Construction Sector (Self-certification by Plumbers and Drainlayers) Amendment Act 2026. Certifying plumbers and certifying drainlayers can apply to the Plumbers, Gasfitters and Drainlayers Board for a self-certification endorsement. It is not automatic and it is not attached to an ordinary licence.
MBIE’s page for homeowners explains what it does. If your plumbing or drainlaying work needs a building consent, you can choose to use an endorsed plumber or drainlayer to sign off eligible work instead of having your building consent authority inspect it. No BCA inspections for eligible work, and no inspection fees. For scale, MBIE notes that most new residential builds require about four BCA inspections for plumbing and drainlaying work.
The conditions matter. The Board is explicit that a building consent is still required where one would normally be needed, the work must still comply with the Building Code, and a code compliance certificate may still be required. Endorsed practitioners must issue a certificate of compliance and supporting documents within 10 working days of finishing, to you, to the BCA and to the Board. The BCA must accept that certificate as evidence the work complies with the consent.
Eligibility is limited. Work must be in buildings of no more than three storeys, must not be in apartment buildings, and must be designed to an Acceptable Solution or Verification Method. Work in a shared wall, work that penetrates a fire separation, and civil works are excluded.
For a standard Auckland house bathroom, that fits. If you were weighing DIY partly to dodge inspection delays, that specific argument just got weaker. Ask any plumber you are quoting whether they hold the endorsement, and ask whether your work is eligible.
So What Can You Actually Do In Your Own Bathroom?
Pulling all of that together, here is the honest split. This is general guidance for an ordinary Auckland house, not advice on your property — your council and a Licensed Building Practitioner are the people who confirm your specific job.
Genuinely yours to do
- Demolition and strip-out of non-plumbed elements. Tiles, wall linings, the old mirror, the towel rails, the cabinetry carcass. Check for asbestos first if the house predates 2000 — our guide to asbestos in an Auckland renovation covers the survey duty and who carries it.
- Painting. All of it.
- Replacing or repairing taps, ball valves, tap washers and plugs. Explicitly outside the definition of sanitary plumbing.
- Buying and supplying your own fixtures and finishes. Often the largest saving available and it carries no legal risk at all, provided the products suit a wet area.
- Project coordination, if you genuinely have the time. Seven to eight trades pass through a bathroom and they are sequential.
Legally yours, but think hard
- Tiling and waterproofing. No licence class exists, so nothing stops you. Everything about the consequence should. A membrane failure does not announce itself for two or three years, and by then it has usually reached the framing.
- The electrical work on the regulation 57 list, with a licensed electrical worker booked to test, certify and connect. Nothing energised while you work, nothing at the switchboard.
- Restricted building work as an owner-builder, with the statutory declaration done first and the LIM entry accepted.
Not yours
- Any pipe. Waste, soil, vent, overflow, supply. Unfixing the old toilet and vanity included.
- Any drainlaying. No householder exemption exists.
- Gasfitting, including anything touching a gas califont serving the bathroom.
- Anything at the switchboard.
What The Saving Actually Looks Like
Run the numbers honestly and the DIY case gets narrower than it feels on Saturday morning.
Our published Auckland figures put a mid-range full bathroom renovation at $25,000 to $35,000, covering design, supply, all trades and project management. A budget refresh of paint, fittings and minor tiling runs $8,000 to $15,000. A custom or luxury bathroom with premium materials, structural changes or a wet room sits at $35,000 to $65,000 and up. You will find the full tier-by-tier breakdown in our Auckland bathroom renovation cost guide, and the same figures on our renovation FAQ.
Now subtract what you cannot legally remove from that number. The plumber stays. The electrician stays. If the work needs consent, the consent and its fees stay. What is left to save on is demolition, painting, tiling, waterproofing and supply.
Demolition and painting are real savings and carry no compliance risk. Supply can be a real saving too. Tiling and waterproofing are where the apparent saving and the actual risk sit on top of each other, which is a poor place to be economising. Our guide to the mistakes we see most often in Auckland bathrooms is largely a list of what happens when that particular saving is taken.
There is also a timeline cost. A standard full bathroom renovation takes 3 to 4 weeks from the day demolition starts, assuming the design is finalised and materials are on order. If consent is needed, add 4 to 8 weeks of Auckland Council processing before the build phase can begin. A DIY stage that runs late does not delay itself; it delays every trade booked behind it. We cover the sequencing in detail in our breakdown of the stages of a bathroom renovation.
The Parts Nobody Prices Until Later
Insurance
The Board’s own consumer guidance makes the point in a single line: you almost might need to notify your insurance company of renovations to keep within your policy. Whoever does the work, tell your insurer before it starts. We wrote a full guide to what happens to your house cover while you renovate, and the short version is that assumptions in this area are expensive.
Certificates
A renovation done properly produces paper. A plumbing certificate of compliance. An electrical certificate of compliance. A waterproofing producer statement or warranty. A code compliance certificate where a consent was involved. Those documents are what a buyer’s lawyer asks for, and DIY work generally cannot produce them.
Warranty
We say this to clients directly and it is in our published FAQ: you are welcome to complete certain elements yourself, such as painting, demolition or supplying materials, but discuss it upfront so the project can be planned around it, because some trades are sequential and a delayed DIY stage affects the rest. And we cannot warranty work completed by others. For anything that is plumbing, electrical, waterproofing or structural, the cost of fixing poor workmanship far outweighs the initial saving.
If you want the split to work, it needs to be agreed at quoting stage and written into the contract, with the boundary between your scope and ours stated in words. Our guide to renovation contracts, quotes and variations explains how that gets documented.
Before You Buy A Single Fitting
- Write down which fixtures move. Repositioning within the existing bathroom is treated very differently from adding a fixture that was not there.
- Count the fixtures before and after. If the total goes up, assume consent.
- Ring Auckland Council on 09 301 0101 and describe the job to the building helpdesk. It is free and it takes ten minutes.
- Check the age of the house. Pre-2000 means an asbestos conversation before demolition, not after.
- Ask why the old bathroom failed. If the answer is a leak, the durability carve-out may put you outside the exemption.
- Book the plumber and electrician before demolition, not after. Ask the plumber whether they hold a self-certification endorsement.
- Check licences on the public registers. The Board’s register for plumbers, gasfitters and drainlayers; lbp.govt.nz for Licensed Building Practitioners.
- Tell your insurer.
- If you are doing restricted building work yourself, complete the statutory declaration before you start and accept the LIM entry.
- Decide who owns the waterproofing, and be honest about whether that should be you.
The Honest Summary
You can do more of your own bathroom than a builder will typically tell you, and much less of it than the internet implies. The line does not run where most people think. It is not drawn around difficulty, it is drawn around who carries the certificate at the end.
The strangest part of the whole picture is that the law is tightest on the pipework, which rarely fails quietly, and silent on the waterproofing, which almost always does. If you take one thing from this, let it be that the absence of a licence class is not a signal that the job is simple.
Where a DIY split genuinely works, it is agreed early, written into the scope, and kept well away from the membrane. That is the version we are happy to plan around, and it is the version that still has paperwork at the end of it. When clients ask us to handle the whole thing instead, what they are really buying is one contract that carries the plumbing, electrical and waterproofing certificates rather than four separate conversations about who signs for what.
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Can I renovate my own bathroom in NZ?
Partly. You can legally do the demolition, the painting, the tiling, the waterproofing and the supply of your own fixtures, and you can replace or repair taps, ball valves, tap washers and plugs. You cannot do the pipework. Section 6 of the Plumbers, Gasfitters, and Drainlayers Act 2006 defines sanitary plumbing to include fixing or unfixing any sanitary fixture and any waste, soil, vent, overflow or supply pipe, and section 8 restricts that work to authorised people. Electrical work has a separate homeowner allowance under section 79 of the Electricity Act 1992, but a licensed electrical worker must test, certify and connect it.
Is there a householder exemption that lets me do my own plumbing?
Section 15 of the Plumbers, Gasfitters, and Drainlayers Act 2006 is headed Exemption for householders and says the owner of premises occupied as their residence may do any sanitary plumbing in those premises. Two conditions sit underneath it. Subsection 2 allows help only from a family member living with you. Subsection 4 says the exemption applies in the places the Minister determines after consulting the local authority, and the New Zealand Legislation website notes there is no secondary legislation made under that section currently on the site. The Board's own consumer guidance does not mention the exemption and tells homeowners they can replace or repair taps, ball cocks and plugs. Contact the Board about your property before relying on it.
Do I need building consent for a bathroom renovation in Auckland?
Usually not, if the fixtures stay within the existing bathroom and the total number of sanitary fixtures does not increase. Auckland Council says you are unlikely to need consent to reposition or replace a bath, bidet, wash hand basin, shower or toilet pan within an existing bathroom, to move a toilet pan into an adjacent existing bathroom, or to replace wall and floor linings and finishes including tiled shower linings. You do need consent if you add a fixture where there was not one before, and possibly for terraced housing, apartment units, areas with tiled floor finishing, or a new gully trap.
Does doing the plumbing myself affect whether I need consent?
Yes, and this is the most expensive thing most people do not know. Auckland Council states that an authorised person must be employed to carry out the plumbing and drainage building work for it to have building consent exemption, and that if an authorised person does not complete the work then it is not exempt. Authorised person means a registered certifying plumber or drainlayer, or a licensed or trainee plumber or drainlayer working under supervision. A homeowner is not on that list. MBIE's guidance on Schedule 1 exemption 32 names an authorised plumber as the legally required professional.
What electrical work can I legally do in my own bathroom?
Regulation 57 of the Electricity (Safety) Regulations 2010 sets the list for an installation at or below 80 amperes per phase single-phase. It covers removing and replacing fuse links, connecting and disconnecting fixed-wired appliances, relocating existing switches, socket-outlets and lighting outlets on tough plastic-sheathed cable, replacing switches, socket-outlets, light fittings, thermostats and elements where no switchboard work is involved, and installing or altering subcircuits with inspection and certification. Section 79 of the Electricity Act 1992 requires the work to be done with nothing connected to a power supply, and tested, certified and connected by a licensed electrical worker.
Is bathroom waterproofing restricted building work in New Zealand?
Waterproofing is not one of the five kinds of work listed in clause 5 of the Building (Definition of Restricted Building Work) Order 2011, which are bricklaying or blocklaying, carpentry, external plastering, foundations and roofing. There is also no Licensed Building Practitioner class for waterproofing or tiling among the seven classes, which are design, carpentry, roofing, external plastering, bricklaying or blocklaying, foundations and site. The work still has to comply with Building Code clause E3, which requires surfaces in wet areas to be impervious, easily cleaned and ventilated, whether or not a consent is involved.
My shower is leaking. Can I redo it under the repair and maintenance exemption?
Possibly not. Both Schedule 1 clause 1 and clause 32 of the Building Act 2004 exclude repair or replacement, other than maintenance, of any building product or assembly that has failed to satisfy the provisions of the building code for durability. A failed waterproofing membrane is a durability failure, so the job may fall outside the exemption you were relying on. MBIE gives replacing a leaking water supply pipe that has failed its durability requirement as an example of work that needs consent. Ring the Auckland Council building helpdesk on 09 301 0101 and describe the job before you start.
What is the owner-builder exemption and can I use it on a bathroom?
It lets owner-occupiers carry out restricted building work on their own home under an approved building consent. You qualify if you live in or will live in the home, you do the work yourself or with unpaid friends and family, and you own or have a legal interest in the property. It cannot be used for homes renovated mainly for sale or rent. You can use it repeatedly on the same property, but only once every three years on a different one. It does not cover electrical, gasfitting, plumbing or drainlaying. You must complete a statutory declaration witnessed by a Justice of the Peace or solicitor before the work begins, and the council records on the property's LIM whether the work was done by an owner-builder or an LBP.
How much does a bathroom renovation cost in Auckland in 2026?
A mid-range full bathroom renovation costs between $25,000 and $35,000, covering design, supply, all trades and project management. A budget refresh of paint, fittings and minor tiling runs $8,000 to $15,000. A custom luxury bathroom with premium materials, structural changes or a wet room sits at $35,000 to $65,000 and above. The final figure depends on the size of the room, your product choices, whether consent is required and how complex the work is. A fixed-price quote after an in-home consultation is the only reliable number for your bathroom.
What does Auckland Council charge for a minor plumbing consent?
Auckland Council publishes a fixed fee of $354 for minor plumbing alterations under $5,000 in value where a producer statement is provided by a certifying plumber, non-refundable with no additional charges. For the same value of work completed by someone who is not an approved installer, the fee is the same $354 plus one inspection fee of $201. A code compliance certificate application follows at the end and is subject to additional processing charges. Applications are processed within 20 working days.
What is self-certification for plumbing and drainlaying?
It started on 7 September 2026. Certifying plumbers and drainlayers who hold an endorsement from the Plumbers, Gasfitters and Drainlayers Board can certify their own eligible work, which removes the need for building consent authority inspections of that work. A building consent is still required where one would normally be needed, the work must still comply with the Building Code, and a code compliance certificate may still be required. Eligible work must be in buildings of no more than three storeys and not in apartment buildings. The endorsed practitioner issues a certificate of compliance within 10 working days to you, the BCA and the Board.
Can I do some of the work myself if Superior Renovations does the rest?
Yes, and clients do. Painting, demolition and supplying your own materials are the usual ones. We ask that you raise it upfront so the programme can be planned around it, because bathroom trades are sequential and a DIY stage that runs late pushes everything behind it. We cannot warranty work completed by others, and for anything that is plumbing, electrical, waterproofing or structural we strongly recommend licensed professionals, because the cost of putting poor workmanship right in those areas far outweighs the saving. The split needs to be agreed at quoting stage and written into the contract.
Further Resources for your bathroom renovation
- Featured projects and Client stories to see specifications on some of the projects.
- Real client stories from Auckland
- Our full guide to what a bathroom renovation costs in Auckland
- What the Building Code asks of a fully waterproofed wet room bathroom
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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Book a no-obligation consultation with the team at Superior Renovations, we’d love to meet you to discuss your renovation ideas!
References
- Plumbers, Gasfitters, and Drainlayers Act 2006 (sections 6, 8, 10, 15, 19 and 123) — New Zealand Legislation
- Building Act 2004, Schedule 1 — Building work for which building consent is not required (clauses 1, 32, 34 and 35) — New Zealand Legislation
- Building (Definition of Restricted Building Work) Order 2011 (clauses 3 and 5) — New Zealand Legislation
- Electricity Act 1992 (sections 79 and 162) — New Zealand Legislation
- Electricity (Safety) Regulations 2010 (regulation 57) — New Zealand Legislation
- Plumbers, Gasfitters and Drainlayers Board — Advice for Consumers
- Plumbers, Gasfitters and Drainlayers Board — Self-certification for plumbing and drainlaying
- MBIE Building Performance — Homeowners and self-certification for plumbing and drainlaying
- MBIE Building Performance — What plumbing and drainlaying work can be self-certified
- MBIE Building Performance — Schedule 1 exemption 32: repair, maintenance and replacement of sanitary plumbing and drainage
- MBIE Building Performance — Building Code clause E3 Internal moisture
- MBIE Building Performance — LBP licence classes
- Auckland Council — Kitchen and bathroom home renovations
- Auckland Council — Minor plumbing alterations
- Auckland Council — Building work you can do yourself (DIY) and owner-builder exemptions
- Electrical Workers Registration Board — Prosecutions of non-licensed work

