Plumber Licensing NZ: PGDB Registration Requirements Explained
The Plumbers, Gasfitters and Drainlayers Board (PGDB) regulates all licensed plumbing work in New Zealand. Here's what each registration class means, who can sign off what, and how to keep your practising licence current.
The key fact
In New Zealand, sanitary plumbing, drainlaying, and gasfitting are restricted building work under the Plumbers, Gasfitters, and Drainlayers Act 2006. Only registered and licenced practitioners can legally carry out this work. Trading without a current practising licence — even with full qualifications — is illegal and can result in significant fines.
Registration Classes: What Each Means
Plumbing, drainlaying, and gasfitting are separate trades with separate registration classes
Registered Plumber
Entry level. Qualified tradespeople who have completed their apprenticeship but haven't yet met the Certifying threshold.
Can do
Carry out sanitary plumbing work (water supply, drainage, waste, venting) under supervision of a Certifying Plumber.
Cannot do
Sign off a Certificate of Compliance independently. Cannot supervise other Registered Plumbers.
Certifying Plumber
The key distinction for self-employed plumbers. You need this to sign off your own work and run an independent business.
Can do
Carry out and sign off all sanitary plumbing work. Issue the Certificate of Compliance. Supervise Registered Plumbers and apprentices.
Cannot do
Carry out gasfitting or drainlaying unless they also hold those endorsements.
Registered Drainlayer
Separate registration from plumbing — many plumbers also hold this endorsement for complete on-site capability.
Can do
Carry out drainage work (stormwater, sewer connections) under supervision of a Certifying Drainlayer.
Cannot do
Sign off drainage compliance certificates independently.
Certifying Drainlayer
Required for contractors who do full sewer and stormwater connections without subcontracting sign-off.
Can do
Carry out and certify all drainlaying work. Issue compliance documents for drainage.
Cannot do
Carry out plumbing or gasfitting unless separately registered.
Self-employed plumbers: check your class before you start
If you're a Registered Plumber (not Certifying), you need a Certifying Plumber to sign off your Certificates of Compliance. This creates a dependency that affects your ability to operate independently. Confirm your registration class at pgdb.co.nz before going out on your own.
The Certificate of Compliance (CoC)
What it is, when it's required, and who can issue it
A Certificate of Compliance (CoC) is the legal document confirming that plumbing work has been completed to the required standard. Under the Building Act 2004 and the Plumbers, Gasfitters, and Drainlayers Act 2006, a CoC is required for most plumbing and drainlaying work that requires a building consent.
Who can issue a CoC
Only a Certifying Plumber or Certifying Drainlayer (for drainage work) can sign off a Certificate of Compliance. Registered Plumbers cannot issue a CoC independently.
What work requires a CoC
Any plumbing or drainage work associated with a building consent. Some minor maintenance work is exempt — but anything involving new pipe runs, fixture installation as part of a build, or alterations to the sanitary system typically requires one.
Timeframes
The CoC must be provided to the building consent authority as part of the compliance process. Keep copies for your records — property owners may request these years later for sale or insurance purposes.
Annual Renewal: How It Works
Practising licences must be renewed each year — lapsing your licence means you cannot legally trade
Tip: Set a recurring calendar reminder 6 weeks before your renewal date. Lapses can happen when you're busy — and trading with a lapsed licence is illegal regardless of whether it was intentional.
Apprenticeship and Qualification Pathway
The typical path to Certifying Plumber in NZ:
| Stage | Typical Duration | Outcome |
|---|---|---|
| Apprenticeship (NZ Certificate in Plumbing, Gasfitting and Drainlaying) | 4 years | Eligible to apply for Registered Plumber status |
| Registered Plumber — working under supervision | Varies (typically 2–4 years) | Builds experience toward Certifying threshold |
| Certifying Plumber application | Portfolio-based assessment | Certifying Plumber status — can sign off CoCs independently |
Key Compliance Points for Running a Business
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