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External flush tank replacement: wall-hung toilet with a flush plate above
Plumber11% off30-day warranty included

External flush tank replacement

Takes about 1 hr

Older bathrooms often have a cistern mounted on the wall with a flush pipe down to the pan. When it cracks or keeps leaking, replacing it is cleaner than patching. A verified plumber shuts the inlet, takes down the old tank, fixes the new one to the wall at the right height, connects the inlet and flush pipe, and seals the joint at the pan.

The visit takes about an hour, at the fixed price shown on this page. Buy the new external tank before the visit and check it comes with its brackets and flush pipe. A new inlet connector or valve, if needed, is quoted before fitting.

What's included

  • Old external cistern removed
  • New tank fixed to the wall at the right height
  • Inlet connected and float level set
  • Flush pipe joined and sealed at the pan
  • Flush and leak test before leaving
  • 30-day warranty on the fitting

What's not included

  • The new tank and flush pipe, bought by you
  • A new inlet connector or valve, quoted first
  • Changing to a concealed cistern

How the visit goes

  1. 1

    Shut and drain

    The inlet is closed and the old tank is flushed empty.

  2. 2

    Take down the old tank

    The inlet, flush pipe and brackets are undone and the old cistern is lifted off.

  3. 3

    Mount the new tank

    Brackets are fixed level, the tank is hung and the flush pipe is sealed into the pan.

  4. 4

    Fill and test

    Water is let in, the float is set and the toilet is flushed to check every joint.

What we need from you

  • The new tank with brackets and flush pipe
  • Access to the inlet valve
  • A clear bathroom wall around the old tank

Questions about this service

Can you convert my wall tank to a concealed cistern?

That needs wall breaking and civil work, which this service does not cover. Book a plumber consultation for a written quote.

Can the new tank go at a different height?

Usually, if the flush pipe you bought is the right length. The plumber checks this with you before drilling.

What if my old inlet valve leaks?

A new valve is quoted before fitting, so you can decide on the spot.

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