Most of the advice on how to fix a leaking tap in Australia treats every tap the same, and that’s where the DIY repair usually goes wrong. Compression taps have rubber washers. Ceramic-disc cartridge taps, which are in most Australian homes built after 1990, have cartridges instead. The fix is different, the tools are different, and depending on your state, what you’re actually allowed to do yourself can be different too.
Tap types and failure modes
Before you buy a washer and start disassembling things, you need to know what type of tap you’re working with. Getting this wrong is how a quick Saturday repair becomes an emergency call-out.
Compression taps are the older style: turn the handle, it pushes a rubber washer or jumper valve against a brass seat to stop the flow. When they drip, the cause is nearly always a worn washer, a worn jumper valve, or a damaged valve seat. The first two are straightforward DIY jobs. A damaged seat needs a reseating tool; no tool, call a plumber.
Ceramic-disc cartridges are in most Australian homes built after 1990. Two ceramic discs rotate against each other instead of compressing rubber against brass. More durable, yes, but when they fail, grit contamination or a cracked disc is usually the cause, and the whole cartridge needs replacing, not just a rubber part. Either way, a single dripping tap can waste over 2,000 litres per month. Different tap type, different diagnosis, different fix.
Legal DIY permissions
The permission question catches people out because the answer varies by state.
In most Australian jurisdictions, replacing a washer, jumper valve, or ceramic-disc cartridge in an existing tap is lawful homeowner work. You are repairing the internals of a tap you already own, not touching supply lines, not installing new fixtures, not modifying pipework. That distinction is what matters legally.
Here is the current picture by state:
- NSW: Washer and jumper-valve replacement is permitted. Replacing a whole tap fixture requires a licensed plumber.
- QLD: Washer replacement is permitted under the Queensland Plumbing and Wastewater Code.
- WA: From 10 February 2024, homeowners can legally replace washers, tap components, and shower heads on their own property, per the WA Department of Energy, Mines, Industry Regulation and Safety. This covers standard tap repair only, not general plumbing work.
- VIC: Washer replacement is treated as permitted maintenance; replacing a whole fixture is understood to require a licensed plumber. Verify with the Building and Plumbing Commission before acting on this.
- SA, TAS, NT, ACT: Not verified against primary government sources for this article. Check with your state or territory authority before starting work.
Check your home insurance policy’s PDS. What unlicensed work does to your cover is between you and your insurer.
Important. Some home improvement and repair work must be carried out by a licensed professional under Australian law. This includes electrical work, gas fitting, structural modifications, and plumbing connections. This article is for general information only. Always check your state and territory regulations before commencing any building or renovation work, and obtain the necessary permits where required. When in doubt, consult a licensed professional.
Major Section 3a: Compression tap repair
Compression taps are the older-style fittings with separate hot and cold handles that you turn multiple times to open. If your house was built before the 1990s and the tapware has never been replaced, this is almost certainly what you have.
The leak is almost always a worn jumper valve or washer at the base of the spindle. When it wears down, it stops sealing against the valve seat and water gets past. Replacing it is well within most homeowners’ capability and one of the more satisfying examples of how to fix a leaking tap without spending money on a callout.
What you need: tap spanner or adjustable wrench, flathead screwdriver, replacement jumper valve (12mm is standard, but measure yours), thread tape.
Steps:
- Turn off the water at the isolation valve under the sink or at the meter. Open the tap to release any remaining pressure.
- Remove the handle. There is usually a decorative cap hiding a screw at the top.
- Use the tap spanner to unscrew the headgear (packing nut) counter-clockwise.
- Pull out the spindle. The jumper valve sits at the bottom, sometimes held in place by a small brass nut.
- Replace the washer or jumper valve. Compressed, cracked, or deformed rubber is your culprit.
- Reassemble in reverse. Wind thread tape onto the headgear threads before reinstalling.
When to stop: If the valve seat (the brass surface the washer presses against) is pitted, scored, or corroded, a new washer will not hold. Seat grinding or replacement needs a licensed plumber. Do not continue and hope for the best.
Major Section 3b: Ceramic-disc tap repair
Post-1990 Australian homes mostly run ceramic-disc taps. Single-lever mixers, quarter-turn handles: these are ceramic-disc. There is no rubber washer inside. The working part is a pair of ceramic discs inside a sealed cartridge.
When a ceramic-disc tap drips, the cartridge is usually the culprit. The catch is that cartridges are brand and size-specific, which is where most DIY attempts stall. The wrong cartridge wastes a trip and leaves the tap in pieces on your bench.
Here is how to do it properly:
- Shut off the water at the under-sink isolator, or at the mains.
- Open the tap to release pressure in the line.
- Remove the handle. There is usually one screw hidden under a decorative cap on top.
- Unscrew the cartridge retaining nut and lift the cartridge straight out.
- Photograph it before anything else, then take it to a plumbing trade supplier and ask them to match it. Brand, disc diameter, and cartridge height all matter.
- Fit the replacement in the same orientation as the original, reassemble, and reopen the supply slowly.
When to stop: A cracked cartridge housing or damaged tap body is beyond DIY repair. And if your tap has a temperature-limit stop or scald guard, it is likely a thermostatic mixing valve. TMVs require a licensed plumber. Incorrect reassembly removes the scald protection these valves exist to provide, which is why this is not a job to push through on a Sunday afternoon.
When to stop
Three things tell you this job has gone past what you should be doing yourself.
A cracked cartridge housing. If you pull the cartridge and the housing it sits in is cracked, or the tap body itself is damaged, no amount of fitting a new part will fix it. You need a new tap. Fitting a new tap fixture involves cutting into the water supply line, and that is licensed plumber territory in every Australian state and territory.
Valve-seat damage. If you have a compression tap and the seat is pitted, scored, or corroded beyond what a reseating tool can address, the DIY path is closed. A damaged seat will destroy a new washer inside a week.
A thermostatic mixing valve. Many modern mixer taps contain a TMV, which regulates water temperature to prevent scalding. If your tap has a temperature-limit stop or an adjustment collar near the handle, assume it has a TMV until you know otherwise. Under the Plumbing Code of Australia, TMVs must be installed and serviced by a licensed plumber. Reassemble one incorrectly and you remove the scald protection it exists to provide. That is a genuine safety risk, not a theoretical one, and it is not worth running to avoid a callout fee.
If you are unsure which category your tap falls into, stop before you disassemble anything further and call a licensed plumber.
Renters and insurance
If you rent, the rules are simple: notify your property manager in writing before you touch anything. Across Australia, residential tenancy legislation makes repairs to the property the landlord’s responsibility, and carrying out unauthorised plumbing work can put you in breach of your lease, even if you were only trying to help.
For insurance, check your own policy PDS. Renters insurance covers your belongings, not the building. Most policies will not pay out for water damage to your contents if the leak was reported and not acted on. Document every notification. An email with the date, a description, and a photo is worth far more than a phone call when a claim is on the table.
Closing and key takeaways
A leaking tap is one of those jobs where knowing your limits is worth more than any tutorial. Get the tap type right before you buy parts. Compression taps with worn washers or jumper valves are squarely in DIY territory for most homeowners. So is a ceramic-disc cartridge swap, provided you source the correct replacement. Valve-seat damage, TMVs, or anything touching the pipework itself — call a plumber. It costs less than fixing what goes wrong otherwise.
Important. Some home improvement and repair work must be carried out by a licensed professional under Australian law. This includes electrical work, gas fitting, structural modifications, and plumbing connections. This article is for general information only. Always check your state and territory regulations before commencing any building or renovation work, and obtain the necessary permits where required. When in doubt, consult a licensed professional.
Frequently Asked Questions
Is it legal for me to fix my own leaking tap in Australia?
For basic maintenance work on existing tapware, yes -- in most states. Replacing a washer, O-ring, or ceramic cartridge in a tap that's already installed is generally considered minor maintenance and is permitted for homeowners in most Australian states and territories. What's not permitted is anything involving the water supply pipework itself: cutting into pipes, relocating fittings, or replacing the tap body at the wall connection. That's licensed plumbing work. The rules vary slightly by state, so if you're in doubt, check with your state's plumbing regulator. Fair Trading NSW, the VBA in Victoria, and QBCC in Queensland all publish homeowner guidance on what's permissible.
How do I tell whether I have a compression tap or a ceramic-disc tap?
Turn the handle. If it requires multiple turns from fully open to fully closed, you've got a compression tap -- the older style that uses a rubber washer pressed against a brass seat to stop the water. If it opens and closes with a quarter-turn or half-turn, it's a ceramic-disc tap, which uses a cartridge with two ceramic discs that rotate against each other. Most Australian homes built or renovated after about 1990 will have ceramic-disc taps. The distinction matters because the repair is completely different. Compression taps need a new washer or jumper valve; ceramic-disc taps need the right cartridge for that specific brand and model.
My tap is still dripping after I replaced the washer. What's going wrong?
Usually one of three things. First, the new washer is the wrong size or type -- a loose fit won't seal properly no matter how hard you tighten the headgear. Second, the jumper valve (the small brass or nylon disc the washer sits on) is worn or missing; replace it along with the washer. Third, and most importantly: the valve seat itself is damaged. Run your finger around the brass seat inside the tap body. If it feels rough, pitted, or has a visible groove worn into it, a new washer won't fix it -- water will still find a path around the damage. A damaged valve seat needs to be reground with a seat-grinding tool, or the seat replaced. At that point, calling a plumber is the practical call for most homeowners.
When does a leaking tap become a job for a licensed plumber?
A few clear triggers. If you've replaced the washer or cartridge and the tap is still leaking, and the valve seat is damaged, get a plumber. If the tap body itself is cracked or corroded at the spindle or body threads, it needs replacement at the wall connection -- that's licensed work. Thermostatic mixing valves (the kind on hot water outlets to limit scalding risk) must be serviced by a licensed plumber in all states; they're safety devices with specific temperature requirements under AS 3500. And if you're dealing with a concealed tap or any fitting built into tiling or cabinetry where the supply connection isn't clearly accessible, don't start pulling things apart -- the risk of making a manageable drip into a serious water damage job is real.
How much water is a dripping tap actually wasting?
More than most people expect. A tap dripping at one drop per second wastes roughly 12,000 litres a year. That's not an estimate designed to scare you into spending money -- it's basic arithmetic, and your water bill reflects it. A moderate drip, say three drops per second, puts you past 30,000 litres annually. In most Australian capital cities at current water rates, that's a meaningful dollar figure on top of the environmental cost. The repair itself -- a new washer and jumper valve for a compression tap -- costs under $10 in parts and an hour of your Saturday. It's one of the better-value DIY jobs in the house, which is why it's worth doing properly the first time.
