Can I change a tap washer myself in Australia?

Yes, replacing a domestic tap washer, jumper valve, or O-ring is legal for unlicensed homeowners in all Australian states and territories. This minor maintenance does not alter the pipework. Ensure the mains water supply is isolated at the water meter before unscrewing the spindle assembly with a shifting spanner.

Is DIY plumbing illegal in Australia?

Most DIY plumbing is strictly illegal across Australia under state legislation and the National Construction Code Volume Three (Plumbing Code of Australia). Unlicensed work on water supply, sanitary drainage, or gasfitting carries fines up to $40,000 and typically voids home building insurance policies for resultant water damage.

Can I install my own dishwasher or washing machine?

You can connect appliances to existing external isolation taps and waste pipe spigots using supplied flexible braided hoses without a plumbing licence. However, installing new pipework, cutting traps, adding mini cistern cocks, or modifying permanent drainage lines requires a licensed plumber to comply with AS/NZS 3500 standards.

Can I replace a toilet cistern or pan without a licence?

No, replacing a toilet pan, cistern, or internal inlet and outlet valves requires a licensed plumber in Australia. While replacing a toilet seat is exempt, any work involving the sewer connection, backflow prevention, or permanent water supply line is strictly regulated under state plumbing safety legislation.

Can an unlicensed person replace a hot water system?

No, replacing or repairing a hot water system requires a licensed plumber and, depending on the unit, an electrician or gasfitter. Hot water installations are regulated under AS/NZS 3500.4 to prevent scalding risks and catastrophic pressure vessel failures, requiring formal compliance certificates submitted to state authorities.

Can I replace a shower head myself?

Yes, unscrewing an old shower head from an existing shower arm and screwing on a standard water-efficient replacement is permitted without a licence. Apply quality PTFE thread seal tape clockwise around the male fitting to prevent leaks behind the wall, ensuring you do not damage the internal wall union.

What plumbing can I do without a licence?

Discover what plumbing you can legally do without a licence in Australia. Learn state regulations, exempt DIY tasks, and work requiring a licensed plumber.

Quick answer

Unlicensed plumbing in Australia is limited to minor maintenance like replacing tap washers, jumper valves, shower heads, and connecting appliances to existing outlets. Altering pipework, sewer lines, roofing, hot water units, or gas systems legally requires a licensed plumber under AS/NZS 3500 to prevent severe structural damage and regulatory fines.

Skill level: All levels
Time: 4 min read
Trade: Plumbing
Updated: 14 November 2026

Tools you will need

Bahco 9072 - 250mm Adjustable Shifting Wrench
Knipex 87 01 250 Cobra - Water Pump Pliers
Kinco Brass - Standard 15mm Tap Jumper Valves
Consolidated Alloys - PTFE Thread Seal Tape
Monument 345G - Tap Reseating Tool
Rigid 41162 - Model 377 Flaring Tool

The short answer

Plumbing licensing is stricter than most people expect. Cutting into pipework, altering drainage, connecting hot water or gas, and most work behind the wall is licensed -- and unlicensed plumbing can void insurance and fail at sale or inspection.

The generally-allowed minor jobs are cosmetic or wear-item tasks: replacing a tap washer or jumper, swapping a showerhead, plunging a blocked drain, or cleaning an aerator. Some states allow replacing a flexible tap connector; others do not.

What it depends on

Your state or territory -- the list of exempt minor work genuinely differs between states, so confirm with your state plumbing regulator.

Whether it touches the permanent system -- replacing a washer is fine; replacing the tap body or pipework is licensed.

Gas and hot water -- always licensed, no exceptions worth risking.

Rentals and workplaces -- extra compliance obligations may apply.

Your next step

Stick to wear items and clearing blockages; call a licensed plumber the moment a job touches pipework, drainage, gas, or hot water. For the common jobs you can do, see how to clear a blocked toilet and more plumbing guides.

Frequently asked questions

Can I change a tap washer myself in Australia?: Yes, replacing a domestic tap washer, jumper valve, or O-ring is legal for unlicensed homeowners in all Australian states and territories. This minor maintenance does not alter the pipework. Ensure the mains water supply is isolated at the water meter before unscrewing the spindle assembly with a shifting spanner.
Is DIY plumbing illegal in Australia?: Most DIY plumbing is strictly illegal across Australia under state legislation and the National Construction Code Volume Three (Plumbing Code of Australia). Unlicensed work on water supply, sanitary drainage, or gasfitting carries fines up to $40,000 and typically voids home building insurance policies for resultant water damage.
Can I install my own dishwasher or washing machine?: You can connect appliances to existing external isolation taps and waste pipe spigots using supplied flexible braided hoses without a plumbing licence. However, installing new pipework, cutting traps, adding mini cistern cocks, or modifying permanent drainage lines requires a licensed plumber to comply with AS/NZS 3500 standards.
Can I replace a toilet cistern or pan without a licence?: No, replacing a toilet pan, cistern, or internal inlet and outlet valves requires a licensed plumber in Australia. While replacing a toilet seat is exempt, any work involving the sewer connection, backflow prevention, or permanent water supply line is strictly regulated under state plumbing safety legislation.
Can an unlicensed person replace a hot water system?: No, replacing or repairing a hot water system requires a licensed plumber and, depending on the unit, an electrician or gasfitter. Hot water installations are regulated under AS/NZS 3500.4 to prevent scalding risks and catastrophic pressure vessel failures, requiring formal compliance certificates submitted to state authorities.
Can I replace a shower head myself?: Yes, unscrewing an old shower head from an existing shower arm and screwing on a standard water-efficient replacement is permitted without a licence. Apply quality PTFE thread seal tape clockwise around the male fitting to prevent leaks behind the wall, ensuring you do not damage the internal wall union.

Written by Pipey, the Plumbing specialist at WA.Tools.