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Taps

How to replace a kitchen tap

10 min read · Plumbers University teachers

Modern kitchen mixer tap fitted on a stainless steel sink

Quick answer

Isolate the hot and cold, disconnect the supply pipes, undo the tap fixing under the sink and lift out the old tap. Fit the new tap with its base seal, tighten the fixing, connect the flexi tails to isolation valves and test slowly. The hardest part is usually reaching the back nut.

What you need

  • Basin wrench
  • Adjustable spanners x2
  • Head torch
  • Bucket and towels
  • New tap
  • Isolation valves if missing

Choosing the right kitchen tap

  • Check the number of holes in your sink — most modern sinks have one.
  • Check water pressure: some taps need at least 1 bar. Low-pressure homes need a tap rated for low pressure.
  • Check spout height and reach so it clears the bowl and the window.
  • Pull-out spray taps need room underneath for the hose and weight.

Removing the old tap

  1. Turn off both isolation valves, or the stopcock and drain the hot.
  2. Clear the cupboard, lie on your back with a head torch.
  3. Undo the supply connections. Older taps may have copper pipes with tap connectors — undo the nut at the tap.
  4. Undo the back nut with a basin wrench and lift the tap out.
  5. Clean the sink surface.

Pro tip: If the back nut is seized, a long-reach basin wrench is worth every penny. Spray penetrating oil and wait 10 minutes.

Fitting the new tap

  1. Screw the flexi tails into the tap by hand.
  2. Fit the base seal under the tap — Solid tap, Seal, Solid sink.
  3. Feed the tails through and set the tap straight.
  4. From below, fit the support plate, washer and nut. Tighten firmly.
  5. Connect hot and cold tails to the isolation valves. Firm, plus a quarter turn.

Testing

Turn the water on slowly. Check every joint with dry tissue, run hot and cold, check again. Look again the next day.

Common mistakes

  • Sink is stainless and thin — over-tightening bends it. Use the support plate.
  • Flexi tails twisted or kinked.
  • Hot and cold swapped.
  • Low-pressure system with a high-pressure tap — weak flow.

Frequently asked questions

Can I replace a kitchen tap without removing the sink?

Usually yes, with a basin wrench. Only very awkward taps need the sink lifted.

Why is my new kitchen tap flow weak?

It may need higher pressure than your system gives, or the isolation valves are not fully open, or the filter in the tail is blocked.

How long are kitchen tap flexi tails?

Usually around 300–500mm. Extensions are available if needed.

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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