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Taps

How to replace bath taps

10 min read · Plumbers University teachers

Chrome bath shower mixer tap on a white bath

Quick answer

Get access to the tap tails by removing the bath panel. Isolate the water, undo the connectors and back nuts and remove the old taps. Fit new taps with base washers, tighten from below, connect with ¾ inch flexi tails or tap connectors with new fibre washers, and test.

What you need

  • Basin wrench
  • Spanners
  • ¾ inch flexi tails
  • Fibre washers
  • Torch
  • Screwdriver for the bath panel

The hard part: access

Bath taps sit at the end of the bath, often against a wall. Remove the bath panel and look along under the bath with a torch. Sometimes access is very tight and the bath may need to be lifted slightly — plan for this before starting.

Choosing new bath taps

  • Bath pillar taps — two separate taps with ¾ inch tails.
  • Bath filler — two handles, one spout, using both holes.
  • Bath shower mixer — includes a diverter and hose for a hand shower.
  • Check the hole spacing (centres) if replacing a two-hole mixer.

Step by step

  1. Isolate hot and cold; if no isolation valves, use the stopcock and drain the hot.
  2. Undo the tap connectors from the tails.
  3. Undo the back nuts and lift out the taps.
  4. Clean the bath surface.
  5. Fit the new taps with their base seals and tighten from below.
  6. Connect with flexi tails — fitting isolation valves now will make future jobs easy.
  7. Turn on slowly and check all joints.

Pro tip: Acrylic baths flex. Use the support plate or a backing piece so the tap does not wobble and break the seal.

Bath shower mixers need a check

Hand showers can sit in dirty bath water. Many mixers include check valves to protect the drinking supply. Use the hose retainer so the head cannot drop into the bath.

Frequently asked questions

What size are bath taps in the UK?

Bath taps have ¾ inch tails; basin taps are ½ inch.

Do I need to remove the bath to change taps?

Usually not, but access can be very tight.

Why does my new bath tap wobble?

The bath is flexing. Use a support plate or backing to clamp it firmly.

This guide is general advice. If you are unsure, stop and ask a qualified plumber. We teach plumbing only — never work on gas.

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