How to fix a leaking tap
A dripping tap usually means a worn washer or cartridge. Here's how to identify the cause and decide whether it's a DIY job.
1. Identify the type of tap
Most UK taps are either traditional compression taps (worn washer) or modern ceramic-disc taps (worn cartridge). A drip from the spout suggests a worn internal seal; a leak from the base means a worn O-ring.
2. Isolate the water supply
Find the isolation valve under the basin or sink and turn it 90° with a flat screwdriver. Open the tap to release any pressure. If there's no isolation valve, you'll need to turn off the mains.
3. Strip the tap down
Remove the cap, undo the screw, and lift the head off. The cartridge or washer assembly is held by a brass bonnet — undo it with an adjustable spanner. Take the old part to a plumbing merchant to match exactly.
4. Reassemble and test
Replace the washer or cartridge, lightly grease the threads, reassemble in reverse order. Open the isolation valve slowly and check for drips.