How to fix a leaking tap (and when to call a plumber)
A dripping tap wastes water and can get worse over time. Here is how to fix common tap leaks and when to leave it to a plumber.
A dripping tap is easy to ignore, but it wastes water and the leak often gets worse. The good news is that many tap leaks are caused by a worn washer or cartridge that a careful DIYer can replace.
Here is how to tackle a leaking tap safely, and the signs that suggest you should call a plumber instead.
Why taps leak
Most tap leaks come down to a worn internal part:
- A worn washer on traditional taps.
- A faulty cartridge or ceramic disc on mixer and modern taps.
- Loose or corroded fittings around the base or spout.
- Scale build-up that stops parts sealing properly.
The fix depends on the type of tap you have.
Fixing a leaking tap step by step
- Turn off the water at the isolation valve under the sink, or the stopcock.
- Open the tap to drain remaining water.
- Remove the handle (usually a screw hidden under a cap) to reach the headgear.
- Replace the washer or cartridge with a matching part from a hardware store.
- Reassemble, turn the water back on, and test.
If a part does not fit or you are unsure which type you have, take the old part to a store to match it. This is a reasonable task for someone comfortable with basic tools.
When to call a plumber
Call a plumber if:
- The tap still leaks after replacing the washer or cartridge.
- There is a leak behind the tap, around the base or the pipework.
- The tap is old, corroded, or hard to turn off.
- You need a new tap installed or the pipework replaced.
A leak around the base or pipework is a different problem from a worn washer and needs proper attention before it causes water damage.
Fix or replace?
Sometimes the tap is not worth fixing, and a new tap is the more sensible option. Our guide to repair vs quick patch explains when a proper fix is better than a short-term one.
If you need help with a leaking tap, a new tap, or any plumbing work across London, get in touch via our contact page. For guidance on finding a qualified plumber, the WaterSafe scheme lists approved, accredited engineers.
