Do You Need a Licensed Plumber or a Building Consent? A Plain-English NZ Guide
Updated: Oct 12
Planning plumbing or drainage work in Auckland? Two questions always come up: who's allowed to do the work, and does it need a building consent? They often get mixed up, and the answers aren't always the same. This guide separates them and links to the official sources, so you can check the current rules yourself before you start.
In short: most plumbing and drainage work in New Zealand must be done or supervised by someone authorised by the Plumbers, Gasfitters and Drainlayers Board. Some repairs and replacements don't need a building consent when an authorised person does them, but adding new fixtures or tiled wet areas generally does.
Who's allowed to do plumbing and drainage work?
Plumbing, gasfitting and drainlaying are regulated trades in New Zealand. The Plumbers, Gasfitters and Drainlayers Board (PGDB) is the regulator, and its job is to make sure the people doing restricted work are competent to do it. The Board runs a public register, and you can search the register to check a tradesperson's authorisation before you hire them. The Board also backs the Ask for Licensed campaign, which is a good place to start if you're not sure what needs a licensed person.
A good habit to get into: before any plumbing or drainage job, ask for the tradesperson's licence details and look them up. A good tradie won't mind you asking.
When does plumbing work need a building consent?
Building consents are a council matter, separate from licensing. The government's building guidance says some plumbing and drainage work doesn't need a building consent, but only when it's carried out by an authorised person, meaning a registered certifying plumber or drainlayer, or someone working under their supervision. The building.govt.nz page on plumbing and drainage work that doesn't need a building consent lists the work that can be exempt, including:
Repair, maintenance and replacement of sanitary plumbing and drainage
Drainage access points
Minor drain alterations
Alterations to existing sanitary plumbing (water heaters are treated separately)
Repair and maintenance of existing water heaters
The key condition is that the exemption relies on an authorised person doing the work. That's why the two questions are linked: who does the job affects whether a consent is needed at all.
What this looks like in Auckland
Auckland Council's page on minor plumbing alterations gives some practical examples:
Repairing or replacing an existing fixture, like a sink or toilet pan, typically doesn't need a consent.
Adding a fixture where there wasn't one before, like an extra toilet, bath, laundry tub or shower, generally does need a building consent, even when an authorised person does the work.
On consented work, the installer provides a producer statement for the plumbing (a PS3), and you then apply for a Code Compliance Certificate once the work is finished.
For kitchens and bathrooms, the council's kitchen and bathroom renovation guidance says remodelling an existing kitchen in the same space, without moving the sink, typically doesn't need a consent. Installing tiled wet areas and adding new fixtures to existing spaces do. All work still has to meet the Building Code, and the council's advice is simple: if you're not sure, get professional advice.
A quick checklist before you hire
Ask for the tradesperson's licence details and check them on the PGDB register.
Ask whether your job needs a building consent, and who's applying for it.
Get a written, itemised quote that says what is and isn't included. Our guide on how to read a plumbing quote explains what to look for.
On consented work, ask for the producer statement and keep it with your house records.
Frequently asked questions
Can I replace a tap or toilet myself?
The official sources don't give a simple yes or no, because it depends on the job, and some plumbing and drainage work is restricted to licensed people. Check with the PGDB and your council before you start. If you'd rather not take the risk, get a registered plumber to do it.
Does replacing a sink or toilet need a building consent?
Auckland Council says repairing or replacing an existing fixture, like a sink or toilet pan, typically doesn't need a consent. Adding a new fixture generally does. Always confirm for your own property.
Is Poseidon Plumbing registered?
Yes. Steve is a qualified plumber and drainlayer registered with the Plumbers, Gasfitters and Drainlayers Board, and all our work is done by a licensed tradesperson.
Planning plumbing or drainage work?
Whether it's a renovation, new drainage or a fixture upgrade, we're happy to talk it through, let you know if a consent is likely to be needed, and send you a clear, itemised quote. See our plumbing and drainlaying services. Every repair and installation is backed by a 12-month workmanship guarantee. If something we've fitted fails because of our work, we'll fix it at no charge.
Call 021 025 83179, email info@poseidonplumbing.co.nz or send us a message for a free quote. We work right across Auckland, including Glen Eden, Central Auckland and the North Shore.
Sources
This article is general information, not legal advice. Rules change, so check the linked official sources and your council for your specific job.
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