A running toilet is one of the cheapest plumbing faults to fix and one of the most expensive to ignore, because it wastes water every hour of the day whether anyone is home or not. The repair is a fixed price at $120 to $300, and where you land in that band depends on which of three parts inside the cistern has given up. Here is how to tell which one you have before you ring, and when a repair stops being the sensible spend.
Running toilet repair prices, Gold Coast 2026
| What has failed | What you notice | The fix | Price |
|---|---|---|---|
| Inlet valve (the fill valve) | Cistern hisses or keeps trickling after the refill, water runs down the overflow | Inlet valve replaced or serviced | Within $120 to $300 |
| Flush valve or outlet washer | Water trickles into the bowl between flushes, cistern refills on its own | Flush valve or washer replaced | Within $120 to $300 |
| Seal (cistern to pan or outlet seal) | Water around the base or where the cistern meets the pan | Seal replaced, connection remade | Within $120 to $300 |
| Button or flush mechanism sticking | Button stays down, flush will not stop until you jiggle it | Mechanism freed or replaced | Within $120 to $300 |
| Cistern discontinued, cracked, or on its second repair | Parts unobtainable or the same fault keeps returning | Toilet suite replacement | $350 to $750 + the suite |
Those are fixed prices with the part included in the quote before we start. Several toilets in one house done in one visit is cheaper than separate bookings, so tell us how many when you call.
The three usual causes, in plain words
A cistern has two jobs: let water in until it is full, then hold it until you press the button. Two valves do that work, and a set of seals keeps the whole thing dry on the outside. When a toilet runs, one of those three has failed.
The inlet valve is the tap inside the cistern that opens when the water level drops and closes when the float rises to the set level. When the valve wears, or the float is set too high, it never quite shuts, so water keeps coming in and spills down the overflow tube into the bowl. You hear it as a hiss or a faint trickle that goes on long after the flush should have finished.
The flush valve is the plug in the bottom of the cistern. Press the button and it lifts, water rushes into the bowl, then it drops back and seals. When its rubber washer hardens, warps or picks up grit, it no longer seals, water seeps steadily from the cistern into the bowl, the level drops, the inlet valve opens to top it up, and the cycle repeats all day. This is the silent one: no hiss, no puddle, just a bill.
The seals sit between the cistern and the pan and around the outlet. They do not usually make a toilet run, but they do make it leak, which shows up as water on the floor or damp around the base rather than movement in the bowl. A leaking toilet and a running toilet are priced the same because the visit and the work are similar.
The fourth thing worth naming is the button itself. Some dual-flush mechanisms stick down, holding the flush valve open. If the toilet stops running when you press or wiggle the button, that is the fault, and it is a quick one.
How to tell which one you have
Three checks, no tools, five minutes.
- The water-in-the-bowl test. Put a few drops of food colouring in the cistern, do not flush, and come back after about fifteen minutes. Colour in the bowl means water is getting past the flush valve. That is the outlet washer or flush valve.
- The hissing cistern. Take the lid off and look at the water level. If it is sitting at or over the top of the overflow tube and you can hear a hiss, the inlet valve is not shutting off. Lift the float gently with a finger; if the hiss stops, that confirms it.
- The sticking button. Press the button and watch whether it returns fully. If it stays down or the flush runs until you jiggle it, the mechanism is the problem, not the valves.
Water on the floor rather than in the bowl points to a seal. If you cannot tell, do not worry about it. Tell us what you saw and we bring the parts for all of it. We carry the common valve types on the van, which is what keeps this a one-visit job.
Why is a running toilet worth fixing promptly?
Because it never stops. A dripping tap wastes water when the tap is at rest; a running toilet wastes water every minute of every day, including all night and the whole time you are away on holiday. On a metered Gold Coast water bill that is money leaving the house for nothing, and it is usually the explanation behind the "my bill has doubled and I cannot find a leak" call. It also wears the inlet valve out faster, because a valve that is cycling constantly is doing months of work in weeks, and it can mask a genuine pipe leak, because when the meter turns you cannot tell which fault is driving it. Fix the toilet first, then re-check the meter with everything off. If it is still moving, then it is worth talking about leak detection.
The other reason is that a $120 to $300 repair on a toilet that keeps running does not get cheaper by waiting. The same valve costs the same to replace in three months, and you will have paid for all the water in between.
Can I fix a running toilet myself?
Swapping a worn washer inside the cistern is a job Queensland leaves to the homeowner, and if you are handy and the part is obvious, go for it. The honest caveats: the correct replacement valve is model-specific, the cistern-to-pan connection is easy to crack on an older suite, and once you are replacing whole valves or touching the water connection it is licensed plumbing work. If you have had a go, it still runs, and the toilet is now wobbling, that is a fair time to ring.
When does repair stop making sense?
Three situations. The cistern is discontinued and the right valve is no longer made, which is common on suites from the 1990s and earlier. The pan or cistern is cracked, which is never a repair. Or this is the second or third repair on the same old suite, and you are paying $120 to $300 a time to keep a tired single-flush toilet going. In any of those, a toilet suite replacement at $350 to $750 plus the suite is the better spend, and a modern dual-flush suite uses far less water on every flush for as long as it is in service. We lay the decision out properly on our repair or replace a toilet page. If your suite is reasonably modern and this is its first fault, repair it and do not think twice.
Toilet running and you have done the dye test? Call Hills Plumbing & Gas on 0472 657 042 or book through our Leaking Taps & Toilets service page. Fixed price of $120 to $300, the part on the van, one visit. QBCC licence 15243081.