Toilet Repair: 6 Common Problems and What They Cost to Fix

Six problems cover nearly every toilet call: it runs continuously, it will not flush fully, it rocks, it leaks at the base, the handle does nothing, and it blocks repeatedly. Five of the six are inexpensive parts. The sixth is usually not about the toilet at all.

It runs

The flapper has stopped sealing, or the fill valve is set too high and water is going down the overflow tube. Both are cheap parts and both are a ten-minute job. The colouring test (dye in the tank, no flushing, check the bowl in an hour) tells you which.

It will not flush fully

Usually the flapper closes too early because the chain is too long, or the tank water level is set below the mark on the overflow tube. It can also be blocked rim jets: mineral scale in hard water closes the small holes under the rim, so the bowl fills without the swirl that carries waste away.

It rocks

The bowl is not bearing evenly on the floor, and the movement breaks the wax seal below. This is the one to act on. Shimming the rock without lifting the bowl and replacing the seal leaves a waste connection leaking into the subfloor on every flush.

It leaks at the base

Water appearing around the foot after a flush is a failed wax seal, a cracked flange, or a bowl bolted down over an uneven floor. Lifting the toilet is the only way to see which, and all three are contained repairs once it is up.

The handle does nothing

The lift chain has come off the flapper arm or the plastic trip lever has snapped. Both are visible the moment the tank lid comes off, and both are inexpensive.

It blocks repeatedly

If plunging clears it every time and it returns, something is either lodged in the trapway or the branch is restricted. Wipes are the usual culprit: they do not break down in the run to the main whatever the packet says. A closet auger reaches the trapway; beyond that the fault is downstream.

What it costs, honestly

We do not publish figures. Flappers, fill valves, handles and supply lines are small parts carried on the truck; wax seals and flange repairs mean lifting the bowl and take longer. Anything downstream is a drain call rather than a toilet call. The price is agreed in writing before the work starts.

The supply line nobody replaces

The braided hose from the stop to the tank has a service life, and when it fails it does so at full mains pressure with nobody home. Replace it whenever the toilet is worked on and every decade regardless. It is among the cheapest parts in the house and among the most expensive failures.