Plumbing licence NSW: classes, scope and how to apply

What it is

A plumbing licence in NSW is the legal authority to carry out plumbing, drainage or gasfitting work for another person. NSW Fair Trading issues the licences and the Plumbing and Drainage Act 2011 (NSW) sets the framework. If the work you are doing falls inside the regulated definitions you need a licence in the correct class, full stop. Unlicensed work attracts fines and your insurer will not pay out on it.

The legislation behind it

Two pieces of law do most of the lifting. The Home Building Act 1989 (NSW) covers residential building work and contractor licensing. The Plumbing and Drainage Act 2011 (NSW) and the Plumbing and Drainage Regulation 2017 deal with the technical side, who can do the work and what paperwork follows. The Plumbing Code of Australia and AS/NZS 3500 are picked up by reference, so the standards sit inside the legal scheme rather than next to it.

NSW Fair Trading is the regulator. The Plumbing and Drainage Committee advises on policy. The Building Commission NSW handles wider building reform but plumbing licensing still sits with Fair Trading day to day.

Licence classes and scope

NSW issues plumbing work under a few headings. The main ones residential builders run into are:

Plumbing and drainage

Covers water supply, sanitary plumbing, drainage and the connection of fixtures. This is the standard contractor licence for a residential plumber running their own jobs.

Gasfitting

Separate endorsement covering installation of gas appliances, gas piping and the connection of LPG or natural gas. Most residential plumbers carry both plumbing and gasfitting because the work overlaps at hot water units and cooktops.

Mechanical services

Heating, ventilation and air conditioning pipework. Less common on a single house build but turns up on larger projects.

Roof plumbing and stormwater

Covers gutters, downpipes, rainwater tanks and the discharge of stormwater to the legal point. Roofers without this endorsement cannot do the plumbing side of the connection.

A contractor licence lets you sub-contract and run the business. A tradesperson licence lets you do the work under someone else's contract. A supervisor certificate is what you need if you want to supervise others on a contractor licence.

How to apply

You need a relevant qualification (Certificate III in Plumbing as the baseline, plus the gas units if you want the gasfitting endorsement), evidence of supervised on-tools experience, public liability insurance and a contractor licence application through the Fair Trading portal. Renewals run on a one or three year cycle. Fair Trading publishes the current fees on its website.

If you are a builder employing a plumber on your sites, check the licence number on the public register before the first invoice. Engaging an unlicensed plumber on residential work exposes you under the Home Building Act.

Compliance paperwork after the work

Section 6 of the Plumbing and Drainage Act 2011 (NSW) requires the licensee to give the responsible person (usually the owner or builder) a Certificate of Compliance within two business days of finishing the work, and to lodge a Notice of Work and Sewer Service Diagram with the water authority where the connection is to a Sydney Water or Hunter Water system.

The Certificate of Compliance is the document that says the work meets AS/NZS 3500 and the Plumbing Code of Australia. It is the piece of paper your building surveyor will ask for at occupation, and the document the owner needs if they ever sell. Lose it and you are chasing the plumber years later.

For gasfitting work, a separate gas compliance form is required and the appliances must be tested before commissioning.

Common mistakes on residential jobs

The big three we see on builder sites are: a plumber working under a tradesperson licence but signing off as the contractor, gasfitting being done by a plumber without the gas endorsement on hot water swaps, and the compliance certificate never reaching the homeowner. All three are easy to fix if you ask for the licence number and the paperwork before final payment.

When the rules change

NSW has been progressively tightening plumbing oversight since the Shergold-Weir review and the Building Commission's expanded remit. Check the Fair Trading site each financial year for the current fee schedule, qualification updates and any new compliance forms before you assume last year's process still applies.