A leaking toilet cistern is one of the most common plumbing problems we see in homes around Caerphilly. Sometimes it is a cheap washer you can deal with in ten minutes, and sometimes it is quietly soaking your floorboards. This guide helps you tell which kind of leak you have, what you can safely check yourself, and when a plumber is the better choice.
Cistern leaks come in two kinds, and they have different causes. The first is water leaking inside the toilet, from the cistern into the pan. You might hear a faint hiss, see small ripples at the back of the pan, or notice the cistern refilling on its own every so often when nobody has flushed it. This wastes water but does not damage your bathroom.
The second is water leaking outside the toilet, onto the floor or down the back of the pan. This one is more urgent, because water that sits under vinyl, laminate or floorboards can cause rot and stains on the ceiling below without you noticing for weeks.
A simple test for the first kind: put a few drops of food colouring in the cistern, don't flush for about 30 minutes, then look in the pan. If coloured water shows up, water is getting past the flush valve or siphon.
Most cistern leaks come down to a handful of worn or badly adjusted parts:
Start by finding the isolation valve on the pipe feeding the cistern. It usually has a small slotted screw, and a quarter turn with a flat screwdriver shuts the water off. If it won't move, don't force it, as old valves can snap.
Lift the cistern lid and check the water level. It should sit below the top of the overflow pipe, usually at a marked fill line. If it is higher, the float can normally be adjusted with a screw or a clip on the fill valve. On push button cisterns, flushing and wiping the seal at the base of the flush valve can sometimes clear a bit of grit or limescale that stops it sealing.
For outside leaks, dry everything thoroughly with kitchen roll, then hold a dry tissue against each joint and bolt after a flush to find where the drip starts. Take care with cistern bolts: overtightening them can crack the ceramic, which turns a cheap fix into a new toilet.
It makes sense to get a plumber in if any of the following apply:
Most cistern repairs are straightforward and often done in a single visit of an hour or two. Replacing a fill valve, flush valve seal or doughnut washer is routine work, and the cost depends on the parts needed, how easy the toilet is to get at and whether the cistern has to come off the pan. Concealed cisterns and older or unusual models usually take longer.
If the cistern is cracked, or the toilet has had several repairs already, it is sometimes better value to replace it. We will tell you honestly which way we think makes sense rather than push a new suite you don't need. Whatever the cause, it is worth acting quickly. A cistern that runs all the time adds up on a metered water bill, and a slow leak onto the floor only gets more expensive to put right.
Call Simon for an initial chat, or send a couple of photos of the space and Sycamore will come back with a quote the same week.
A few photos and a sketch of the room is usually enough for a first quote. For anything structural or tricky, we come and look.