Plumbing licence requirements by Australian state and territory

Plumbing is one of the most tightly regulated trades in Australia. Bad plumbing damages property, contaminates drinking water, and can kill, so every state takes licensing seriously. Whether you’re starting an apprenticeship, switching states, or trying to work out what a tradie can legally do at your house, this is what you need to know.

The short version

State	Regulator	Initial licence (approx)	Renewal cycle	Gas-fitting separate?
NSW	NSW Fair Trading	~$210	1, 3, or 5 yrs	Gas needs additional auth
VIC	Victorian Building Authority (VBA)	~$300	5 yrs	Yes, separate Type A/B
QLD	QBCC	~$340	3 yrs	Yes, separate gas licence
WA	Building & Energy WA	~$280	1–3 yrs	Yes
SA	CBS SA	~$220	1–3 yrs	Yes
TAS	CBOS	~$240	1–3 yrs	Yes
NT	Plumbers and Drainers Licensing Board	~$260	1–3 yrs	Yes
ACT	Access Canberra	~$220	1–3 yrs	Yes

Fees indicative for 2026, always check the regulator’s current fee schedule before applying.

What a plumbing licence covers (and what it doesn’t)

Each state recognises broadly the same scopes:

• Apprentice / trainee, work only under supervision
• Journeyman / general plumbing, water supply, sanitary plumbing, drainage, roofing
• Restricted plumbing, limited scope (e.g. roof plumbing only)
• Gas-fitting, separate authorisation in every state, requires additional training
• Mechanical services / hydraulic services, large commercial work
• Drainage and sewerage, sometimes combined with general, sometimes separate (VIC keeps them separate)

A homeowner can do roughly three things without a plumber:

1. Change a toilet seat (no water-supply or drainage connection touched).
2. Plunge or unblock a drain with a chemical-free method (no disassembly).
3. Replace a washer in a tap in some states (NSW and QLD allow this; check yours).

Everything else, including replacing a tap, swapping a showerhead that involves the supply connection, fitting a new sink, requires a licensed plumber.

NSW

NSW Fair Trading issues plumbing licences. Pathway:

• Certificate III in Plumbing
• Completed apprenticeship (typically four years)
• Certificate IV is required for a contractor licence
• Application: standard plumber, then optional gas, roofing, drainage endorsements

NSW publishes a small exemption list, homeowners may change tap washers and similar minor work. Sale-of-property rules require a Certificate of Compliance from the licensed plumber who did any installation.

VIC

Victorian Building Authority is unusual in Australia for splitting plumbing licences into discrete classes. A plumber holds only the classes they’re authorised in:

• Water supply
• Sanitary plumbing
• Drainage
• Roofing (stormwater)
• Mechanical services (heating/cooling)
• Gas-fitting (Type A appliances or Type B commercial)
• Fire protection
• Irrigation

This makes verifying a quote easier in VIC, ask which classes the plumber holds.

QLD

QBCC runs one of the strictest enforcement programs in Australia. Unlicensed plumbing carries fines starting at over $50,000 for individuals. QLD also requires a Form 4 (Compliance Certificate) for almost all installations, get it from the plumber.

WA

Building & Energy WA (a division of DMIRS) administers the Plumbers Licensing Board. WA combines water and drainage into a single general licence; gas is separate. Solar hot water installs need an additional CEC accreditation if the system involves PV input.

SA, TAS, NT, ACT

The smaller jurisdictions follow broadly the NSW/VIC template:

• SA. Consumer and Business Services. Renewal options flexible.
• TAS. CBOS in Hobart. Plumbing assessment typically takes 4–6 weeks.
• NT. Plumbers and Drainers Licensing Board (separate from the electrical board).
• ACT. Access Canberra. Smaller market; most plumbers also licensed in NSW.

Mutual recognition between states

The Mutual Recognition Act 1992 lets you convert your existing plumbing licence to another state. You don’t re-sit the Certificate III, but you do:

1. Apply at the destination regulator
2. Pay the local application fee
3. Sometimes complete a jurisdiction-specific module (e.g. WA drainage code)

It is not automatic. Your NSW licence does not let you work in QLD until QBCC has processed the conversion.

Cost to get licensed

For a school-leaver going through the apprenticeship pathway:

• 4 years apprenticeship, wages range $30,000 (year 1) to $70,000 (year 4) before tax depending on state
• Cert III tuition: $2,500–$8,000 depending on state subsidies
• Tools: $2,000–$5,000 over the apprenticeship
• Capstone or licensing assessment: $700–$1,400
• Initial licence application: $210–$340

All-in: roughly $5,000–$14,000 out of pocket before any state apprentice grants (most states have a $1,000–$5,000 grant on completion).

Common mistakes that cost plumbers their licence

1. Sub-contracting unlicensed work. If you sign off on work an unlicensed mate did, your licence carries the consequence.
2. Skipping the Certificate of Compliance. QLD, NSW, and VIC require these on most installs, failure to lodge is a licence-action.
3. Working interstate without converting. Mutual recognition is not automatic.
4. Letting renewal lapse. Most states have a 30–60 day grace period before re-application is required.
5. Doing gas work without gas authorisation. General plumbing licences do not include gas-fitting in any state.

Hiring a plumber, what to verify

Before any plumber does work at your house:

1. Ask for the licence number and the state issued.
2. Verify it on the state regulator’s online register (every state has one).
3. Check insurance, at minimum public liability $5M, ideally $10M.
4. Get a Certificate of Compliance after the work, if your state issues them.
5. Keep the paperwork, your home insurance will need it if the work ever fails.

Without a current, verifiable licence + Certificate of Compliance, your home insurance can refuse to cover damage caused by failed plumbing. The five minutes it takes to check the register is cheap insurance.

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Rules and fees change. Always verify with your state regulator before you pay any application fee or accept any plumbing quote.