What you'll need
Always isolate the water supply before starting. If you can't find an isolation valve and aren't confident turning off the mains, call a plumber.
Step-by-step guide
- Turn off the water supplyFind the isolation valve under the sink (a slotted screw you turn 90 degrees with a flathead screwdriver) or turn off the mains stopcock. Open the tap fully to release any remaining pressure and drain the pipe.
- Remove the tap handlePrise off the decorative cap on top of the handle (usually snaps off). Underneath is a screw — remove it, then pull the handle off. Some handles require a little wiggling.
- Remove the packing nutUse an adjustable spanner to unscrew the large packing nut beneath the handle. Turn anticlockwise. This exposes the tap spindle.
- Replace the washer (traditional taps)At the bottom of the spindle is a rubber washer held by a small brass screw. Remove the screw, pop out the old washer, and fit an identical new one. These cost pennies at any hardware shop.
- Replace the cartridge (modern mixer taps)Modern taps use a ceramic cartridge instead of a washer. Pull out the old cartridge, take it to a plumber's merchant to match it exactly, then push the new one in. No tools required once the handle is off.
- Wrap the threads in PTFE tapeWrap PTFE tape clockwise around the spindle threads 2-3 times before reassembling. This ensures a water-tight seal.
- Reassemble and testReverse the disassembly steps. Tighten the packing nut firmly but not excessively — overtightening damages the seat. Turn the water back on slowly and check for leaks.
Buy a pack of assorted washers (£3-4) and keep them in your toolkit. They're universally useful and you'll use them again.
Expert tips for the best result
- Take the old washer to the hardware shop to match the size exactly — they come in many sizes
- If the tap still drips after replacing the washer, the tap seat (the surface the washer presses against) may be damaged — this needs a tap reseating tool or a plumber
- For ceramic disc taps, a cartridge replacement is almost always the fix
- WD-40 on stiff components helps — but never on rubber washers (it degrades them)
- If the leak is from the base of the tap rather than the spout, the O-ring needs replacing, not the washer
Useful tools and products
When to call a professional plumber
If the tap seat is damaged, if there's no isolation valve and you're unsure about the mains, or if the leak is from inside the wall rather than the tap itself.
We connect you with vetted local plumbers across the UK — fast response, free quotes, guaranteed work.
💬 Get a free quote via WhatsAppFrequently asked questions
How difficult is how to fix a leaking tap for a beginner?
This guide is rated Moderate. A dripping tap wastes up to 5,500 litres of water per year. Most leaking taps are caused by a worn washer or ceramic cartridge — both are cheap parts that can be replaced in under an hour with basic t If you're not confident, a professional plumber can do this quickly and provide a guarantee on the work.
How long does how to fix a leaking tap take?
Allow 30-60 minutes. This assumes the tools and materials are ready before you start. First-timers should budget extra time for preparation and any unexpected issues.
How much does a plumber charge for this in the UK?
Most plumbers charge £40-80 per hour depending on location and complexity. For a straightforward job like this, expect 1-2 hours of labour plus materials. Get a fixed quote via WhatsApp — message us with your postcode and job details.
How do I find a reliable plumber near me?
WhatsApp us with your postcode and job description. We match you with a vetted local plumber from our network — most jobs get a response within the hour. Contact us here.