Toilet repair: what to know

What the job involves, what changes the price, and what to ask a pro.

What toilet repair is

Toilet repair fixes toilets that run, leak at the base, flush weakly or clog, usually by replacing the fill valve, flapper, seal or other worn parts. A good repair finds the failed part and avoids replacing parts that still work.

Signs you need it

  • The tank keeps refilling, or you hear water running in the tank long after the flush
  • Water pools at the base of the toilet, or the floor around it is damp or soft
  • The flush is weak, or the bowl takes several flushes to clear
  • The handle sticks, or the chain is too short or too long to lift the flapper
  • The toilet clogs often, or water rises in the bowl after flushing

What the pro does

  • Check the fill valve and the float height, and replace the fill valve if it does not shut off at the set level
  • Check the flapper or flush valve seal, and replace the flapper if it no longer seals
  • Check the tank-to-bowl gasket and the tank bolts, and replace the gasket or tighten bolts that are leaking
  • Check the wax ring under the base, and reset the toilet with a new seal if it leaks at the floor
  • Clean the rim jets and the trapway if the flush is weak, since mineral and debris build up there
  • Check the supply line and shutoff valve and replace them if they weep or do not close fully

What changes the price

Every job is different, so we do not publish prices. These are the things that move the quote up or down.

  • Which part has failed: a flapper and a fill valve are simple, while a leak from the floor needs the base reset
  • Whether the toilet model is common, since some brands use proprietary parts
  • Age and condition of the shutoff valve and supply line
  • Access, including whether the tank has to be removed to reach the bolts
  • Whether the floor or subfloor needs repair after a long leak at the base
  • Whether a clog is in the trap or the drain line and needs a cable

What a written quote should spell out

  • Diagnosis, with the part or seal that failed and the reason it failed
  • Parts to be replaced, with the model match for the fill valve or flapper
  • Whether the wax ring or base seal is replaced, if the base leaked
  • Supply line and shutoff valve condition, and whether they are replaced
  • Any floor repair needed after a leak, and who does it

Questions to ask before you hire

  • Which part has failed, and how did you confirm it?
  • Will you reset the toilet with a new seal, or can the base be repaired without lifting it?
  • Is the toilet model still supported with parts, and is there a chance it needs replacement?
  • Do you check the subfloor when there is a leak at the base?
  • Will you test the flush and the fill after the repair?
  • Is the clog in the trap, or further down the drain?

Red flags

  • Pro who replaces the whole toilet for a worn flapper or a noisy fill valve
  • Pro who ignores a leak at the base and says the caulk will fix it
  • Pro who reuses an old wax ring after the bowl has been moved
  • Pro who does not check the subfloor when the base has been leaking for a long time

What you can do yourself

A homeowner can replace a flapper, a fill valve or a tank gasket with the water off and the tank drained. Call a pro for a leak at the base, a cracked tank or bowl, a soft floor, or a clog that does not clear with a plunger, since those need the bowl lifted or the drain checked.

Licenses and permits

Toilet repair is commonly done by licensed plumbers, and repairs to the base or drain can require a permit in some areas. Check with your state or local licensing agency to confirm what applies to your work.

Toilet repair questions

How do I know the flapper is the problem?

A tank that refills over and over, or a dye test that shows color in the bowl without a flush, usually points to the flapper. A pro checks the flapper seal and the flush valve together.

Can I just caulk the base of a leaking toilet?

Caulk can hide a leak but does not stop it. A leak at the base usually means the wax ring has failed, and the toilet needs to be lifted and reset with a new seal.

Why does my toilet flush weakly?

Clogged rim jets, a partial clog in the trap, or a fill level set too low can all weaken a flush. The pro checks each one and clears the cause that is found.

Does a running toilet waste much water?

A running toilet can waste a large amount of water every day without any sign in the bowl. A pro can tell you whether the running is from the flapper, the fill valve or the flush valve.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

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