Plumbing Licence WA: Plumbers Licensing Board, Tradesperson and Contractor Licences

What it is

In Western Australia, anyone who carries out or contracts for plumbing work must hold a licence issued by the Plumbers Licensing Board. The Board sits inside Building and Energy, part of the Department of Energy, Mines, Industry Regulation and Safety. The licensing framework comes from the Plumbers Licensing Act 1995 (WA) and the Plumbers Licensing and Plumbing Standards Regulations 2000 (WA), which together define plumbing work, set qualification requirements and authorise the licence classes.

Plumbing work in WA covers water supply, sanitary and drainage plumbing. If a job touches potable water, sewerage, stormwater drainage on the building side or hot water installation, it falls inside the regulated scope. Unlicensed plumbing work is an offence under the Act, and homeowners cannot do their own plumbing beyond very narrow exempt tasks.

The five WA plumbing licence classes

The Plumbers Licensing Board issues five licence types. All holders can perform plumbing work, but scope varies.

Plumbing contractor's licence

Held by the person or business that contracts for plumbing work. A contractor must meet higher qualification and experience requirements than a tradesperson, and the contractor licence is what allows a business to take on plumbing jobs, supervise apprentices and submit notices of work. A company applying for a contractor licence must nominate a qualified individual.

Tradesperson's licence

The standard licence for a fully qualified plumber. A tradesperson can carry out water supply, sanitary and drainage plumbing under the general direction of a contractor. To qualify, an applicant must hold a Certificate III in Plumbing or equivalent, complete the WA plumbing skills assessment and pass the regulatory exam.

Tradesperson's licence (drainage plumbing)

A restricted tradesperson class for workers qualified only in drainage plumbing. A drainage tradesperson can install and repair sanitary drainage but cannot perform water supply or sanitary plumbing above ground.

Provisional tradesperson's licence

Issued to workers who hold overseas plumbing qualifications and intend to gain WA recognition. The provisional licence lets the applicant work under supervision while completing the gap training and assessments needed for a full tradesperson's licence.

Restricted plumbing permit

Issued to licensed electricians or gasfitters who need to replace water heaters as part of their electrical or gasfitting work. The permit is narrow and does not authorise broader plumbing.

How to apply

Applications go to the Plumbers Licensing Board through Building and Energy. The standard tradesperson pathway requires:

• A Certificate III in Plumbing (CPC32420 or recognised equivalent)
• Evidence of completed apprenticeship hours
• A pass in the WA plumbing regulatory exam
• A police clearance and proof of identity
• The relevant application fee

Contractor applicants must additionally show business management capability, which is usually evidenced by a Certificate IV in Plumbing and Services or an equivalent qualification covering quoting, supervision and compliance with the Act.

Renewal, supervision and apprentices

Plumbing licences in WA are issued for a fixed term and must be renewed before expiry. Licensees are responsible for keeping their details current with the Board and for working only within the scope of their class. Apprentices must work under a licensed tradesperson or contractor and cannot sign off plumbing work.

Notices and inspections

Licensed plumbers must submit a Notice of Intention before commencing certain plumbing work and a Notice of Completion after finishing. Building and Energy uses these notices to schedule audits and inspections. Submitting false or misleading information on a notice is a separate offence under the Act.

Working across borders

A WA plumbing licence does not automatically authorise work in other states. Mutual recognition under the Mutual Recognition Act 1992 (Cth) allows a plumber licensed in another Australian jurisdiction to apply for the equivalent WA licence, but the application still goes through the Plumbers Licensing Board and the WA scope rules apply once issued.

Why it matters for builders

Builders in WA who engage plumbing subcontractors should record the licence number, class and expiry of every plumber on site, check the Board's public register before engagement and keep copies of the Notices of Intention and Completion for each job. Engaging an unlicensed plumber exposes the head contractor to compliance action and can void insurance on the affected work.