How to check a plumber is qualified and licensed in NZ

Why plumber licensing matters in New Zealand

Hiring a plumber isn’t just about finding someone who can fix a leak. In New Zealand, plumbing, drainlaying and gasfitting are restricted work, which means the person doing the job must be appropriately licensed and operating within the scope of their licence. That protects your home, your safety and your insurance position.

A qualified, licensed plumber should know how to:

• work to NZ standards and the Building Code
• avoid water contamination and sanitation issues
• install or repair systems safely
• issue the right documentation where required
• recognise when a job needs council consent or another specialist tradesperson

Using an unlicensed person can lead to poor workmanship, failed inspections, expensive rework and, in some cases, legal or insurance problems later.

What licences and registrations to look for

In New Zealand, the key regulator for plumbing-related trades is the Plumbers, Gasfitters and Drainlayers Board (PGDB). It registers and licenses people working in these trades.

Not every plumber will have the same credentials, because the exact work matters. Here’s a simple guide.

A legitimate tradesperson should be able to tell you exactly what they are licensed to do. If the job includes more than one trade — for example a bathroom renovation involving plumbing and gas work — check that they hold the correct licences for each part.

Know the difference between qualified, registered and licensed

These words are often used loosely, but they are not the same thing.

• Qualified usually means the person has completed training, often including an apprenticeship or trade qualification.
• Registered means they are on the official register with the PGDB.
• Licensed means they currently hold a licence that allows them to carry out restricted work.

For a homeowner, the important question is not just “Are you a plumber?” but:

• Are you registered with the PGDB?
• Do you hold a current licence?
• Is that licence valid for the exact work I need done?

For example, someone may be a registered plumber but not licensed in gasfitting. That means they cannot legally carry out gas work unless they also hold the relevant gasfitting licence.

How to verify a plumber’s licence in NZ

There are several practical checks you can do before you accept a quote.

1. Ask for their full name and licence details

Before booking the job, ask the plumber for:

• full legal name
• PGDB registration number
• licence number and type
• expiry date of the licence
• business name and NZBN, if they operate as a company

A professional tradesperson should not hesitate to provide this information.

2. Check the PGDB public register

The PGDB has a public register you can use to confirm whether the person is currently registered and licensed. Search by name or licence details and make sure:

• the person’s name matches
• the licence is current, not expired
• the licence type matches the work you need
• there are no obvious mismatches between the person and the business quoting the work

If you can’t find the person on the register, or the details don’t line up, treat that as a warning sign.

3. Confirm they are licensed for the specific job

A plumber’s licence does not automatically cover every task. Ask directly whether the work includes anything outside their licence, such as:

• gas hot water cylinders or gas appliances
• drainlaying or sewer connections
• work that may require a building consent, such as moving plumbing in a major renovation

If the job has multiple components, make sure the right licensed person will do each part.

4. Ask for proof of insurance and business details

Licensing is essential, but it is not the whole picture. Ask for:

• public liability insurance details
• GST registration status if relevant
• a written quote with business contact details
• whether they subcontract any of the work

If they subcontract, ask who will be doing the job and whether those people are also appropriately licensed.

5. Look for written documentation after the job

For restricted plumbing, drainlaying and gasfitting work, the tradesperson should provide the correct records and certificates where required. Keep these with your house documents.

That paperwork matters if you sell the property later, make an insurance claim, or need proof that the work was done lawfully.

What jobs usually need a licensed plumber

Many common household jobs should only be done by an appropriately licensed person.

These can include:

• repairing burst or leaking pipes
• installing or relocating taps and fixtures connected to plumbing systems
• hot water cylinder work
• connecting dishwashers or washing machines where plumbing alterations are involved
• drain repairs, drain replacements and sewer connections
• gas water heating, gas hobs or other gasfitting work

Some minor maintenance tasks may be straightforward, but if there is any doubt, check before the work starts. In New Zealand, the safest approach is to assume plumbing-related restricted work needs a licensed practitioner unless you have confirmed otherwise.

When council consent may also be needed

A licensed plumber is not a substitute for building consent. Some plumbing work is part of a larger project that may need approval from your local council.

Examples include:

• a bathroom renovation that changes plumbing layout significantly
• adding a new bathroom or kitchen in a different part of the house
• substantial alterations to drainage or water services
• work connected to a renovation that affects structure, waterproofing or ventilation

Consent rules depend on the nature and scale of the work, and on your council’s requirements. A good plumber should be able to tell you when the job may need a builder, designer, engineer or council approval, but the homeowner is ultimately responsible for making sure any required consent is obtained.

Questions to ask before you hire

A few targeted questions can quickly separate a genuine professional from someone who is not properly set up.

Ask:

• What exactly are you licensed to do?
• Can you send me your PGDB registration and licence details?
• Will you provide a written quote and scope of works?
• Who will actually do the work on site?
• Will you handle any compliance paperwork after the job?
• Is any part of this job likely to need council consent?
• Do you carry public liability insurance?

If the job is urgent, such as a leak or blocked drain, you may feel rushed. Even then, take a few minutes to verify the basics before agreeing to work.

Red flags that should make you pause

Be cautious if a plumber:

• avoids giving a licence number
• says licensing “doesn’t matter” for a small job
• offers a price far below other quotes without a clear explanation
• won’t put the quote in writing
• claims they can do plumbing, gasfitting and drainlaying without evidence
• suggests doing restricted work “off the books”
• cannot be found on the PGDB register

A very cheap quote can become expensive if the work has to be ripped out and redone by a licensed tradesperson.

Why getting multiple quotes still matters

Even when a plumber is properly licensed, you should still compare at least two or three written quotes for non-urgent work.

When comparing quotes, look at:

• the scope of work
• whether materials are included
• call-out fees and hourly rates
• expected timeframes
• warranty terms
• whether compliance paperwork is included

In New Zealand, plumbing prices can vary by region, urgency and access. Emergency call-outs, after-hours work and winter leak repairs often cost more, so it pays to understand what is included before agreeing.

What good paperwork should look like

For larger jobs or anything involving restricted work, keep a file with:

• the written quote or contract
• the plumber’s licence details
• invoices and payment records
• compliance certificates or other required documents
• council consent documents, if relevant

This is especially useful if you are planning to sell the property, refinance, or prove to an insurer that the work was done properly.

A simple checklist before you say yes

Use this quick checklist before hiring:

• The plumber is listed on the PGDB register
• Their licence is current
• Their licence type matches the work
• You have a written quote
• Insurance and business details are provided
• You know whether the job needs council consent
• You will receive the required paperwork after completion

If any item is unclear, ask before work begins.

Final thoughts

Checking a plumber’s qualifications and licence in New Zealand is not difficult, but it is worth doing properly. A few minutes spent verifying PGDB registration, licence type and current status can save you from unsafe work, compliance headaches and costly rework.

For most homeowners, the best approach is simple: get multiple written quotes, confirm the person is licensed for the exact task, and keep the paperwork when the job is finished. That way, you’re protecting your home, your budget and your peace of mind.