Mr. Clog Plumbing
Toilet Repair & Cistern Replacement Sydney
Running, leaking or cracked toilet? We repair toilets and cisterns across Sydney, and tell you honestly when it needs a part and when it needs replacing.
No surprise bills: $0 call-out and a fixed price before any work starts.
Our guarantee: 12 months on our workmanship, in writing. What it covers
About This Service
Most toilet repairs come down to one worn part, and a new inlet valve, flush valve or seal costs far less than a new cistern. Replacement is the right call when the cistern itself is cracked, when parts for an old model are no longer made, or when you want to trade an old single-flush cistern for a water-efficient dual flush. Mr. Clog repairs toilets and replaces cisterns across Sydney, checks that the new cistern suits your existing pan, and replaces the whole suite when it doesn't.
What’s Included
- Toilet and cistern repairs: running, leaking and weak flushes
- Cistern and flush mechanism repairs
- Exposed and close-coupled cistern replacements
- Full toilet suite installations
- A fixed price before any work starts
- $0 call-out fee
Fixed price quoted before we start. $0 call-out fee.
Ready to book?
(02) 9139 8945 — available 24/7Toilet Repairs: Signs to Look For
Most toilet problems are a repair, not a new toilet. These are the common ones, and what each usually means.
Water running into the bowl
Usually a worn flush valve seal or an inlet valve that won't shut off. Both are replaceable parts, so this is normally a repair, not a new cistern.
Phantom flushing
The cistern refills for a few seconds on its own every so often. That is a slow leak past the flush valve seal, and a new seal or valve usually cures it.
A weak or incomplete flush
Often a cistern that isn't filling to the right level, a worn flush valve, or a partial blockage in the pan or the drain. The first two are cistern repairs; a toilet that keeps blocking needs the drain checked.
A loose or rocking pan
A pan that moves when you sit on it can break its seal to the drain and start leaking, or crack the porcelain over time. Re-fixing and resealing it is a repair if the pan is undamaged.
A cracked cistern
A crack in the porcelain can't be reliably repaired and can open up without warning. A cracked cistern should be replaced.
Leaking at the base
Often the seal between the cistern and the pan, or the supply connection, rather than the cistern itself. Those are repairs. Replacement only comes into it if the cistern is damaged.
An old single-flush cistern
Older single-flush cisterns commonly use around 11 litres every flush. Replacing one with a dual flush cistern or suite cuts water use substantially.
Parts no longer available
Some older and discontinued cisterns take parts that are no longer made. When a repair isn't possible, replacement is the practical answer.
Types of Cistern
Close-coupled
The cistern sits directly on the back of the pan and is bolted to it through a rubber seal. This is the most common type in Sydney homes.
Exposed wall-mounted
The cistern is fixed to the wall above the pan and joined to it by a flush pipe. Common in older homes and in some accessible bathrooms.
Concealed (in-wall)
The cistern sits inside the wall, and only the flush plate shows. Most internal parts are serviced through the flush plate opening. Replacing the cistern body usually means opening the wall, so it is normally part of a renovation.
Dual flush
A full flush and a half flush from two buttons. Dual flush was developed in Australia and is now the standard for new toilets here.
WELS rating
Toilets sold in Australia carry a WELS label showing a star rating and water use. A 4-star dual flush suite typically uses 4.5 litres for a full flush and 3 litres for a half flush, an average of about 3.5 litres.
What the Job Involves
Matching the pan
The flush volume has to suit the pan. An older pan built for a large single flush may not clear properly with a modern low-volume cistern, which is why an upgrade is often a new suite rather than a cistern alone.
Isolate and remove
The water is turned off at the isolation valve, the cistern is emptied and disconnected, and the old unit is lifted off.
Fit and connect
The new cistern goes on with a new seal and fixings, and is connected to the water supply. An old or damaged flexi hose is worth replacing at the same time.
Licensed work
Replacing a cistern means connecting to the water supply, and a new suite also connects to the sewer. In NSW that is work for a licensed plumber.
How It Works
Our Process
Check the Fault
We find out whether a part or the cistern itself is at fault, and whether a new cistern will suit your pan.
Fixed Quote
You get a fixed price for the repair, the new cistern, or a new suite if the pan needs replacing too.
Swap It Over
We isolate the water, remove the old cistern, and fit the new one with a new seal and supply connection.
Flush Test
We run full and half flushes and check the inlet, the seal and the pan for leaks.
Related Pages
Common Questions
FAQs
Do you repair toilets, or only replace them?
Both. Most toilet faults, such as a running cistern, a leak at the base or a weak flush, come down to a worn part or seal that can be replaced. We only recommend a new cistern or suite when the porcelain is cracked, parts are no longer made, or a repair wouldn't last.
Can you replace just the cistern and keep my toilet pan?
Often, yes, if a compatible cistern is available and the pan is in good condition. If the pan was designed for a much larger flush, or is cracked, a new suite is the better option.
My toilet keeps running. Do I need a new cistern?
Usually not. A running toilet is almost always a worn flush valve seal or inlet valve inside the cistern, and both can be replaced.
What does a WELS star rating mean for a toilet?
It shows how water-efficient the toilet is. More stars means less water per flush. A 4-star dual flush suite typically uses 4.5 litres for a full flush and 3 litres for a half flush.
Can I replace a toilet cistern myself?
Not legally in NSW. Homeowners can replace some cistern washers, but replacing a cistern or toilet involves connecting to the water supply and is work for a licensed plumber.
Can you fix a concealed in-wall cistern?
Yes. Most internal parts are reached through the flush plate opening. Replacing the cistern body itself usually means opening the wall, so we will tell you upfront if that applies.
What Sydney Customers Say
We recently used Mr Clog Plumbing for our granny flat in Guildford and couldn't be happier with the service. Everything was handled professionally from start to finish, with great communication and workmanship…
Absolute legend. Turned up on time, sorted the problem quickly and didn’t charge a fortune. Super easy to deal with and cleaned up after the job too. Will definitely be using him again and would happily recomme…
Turned up on time and honest service, couldn’t ask for much more.
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