Fixing a leaky faucet yourself: what's safe, and when to call a plumber

Every household should fix a dripping tap once, because it teaches everything about safe water work in one afternoon: isolate the supply, take it apart slowly, replace the worn part, put it back. It's low-risk, needs no tools you shouldn't own (they're on the toolkit list), and the water it saves is real — one drip a second is 3,000-plus gallons a year.

First, isolate — the rule that makes it safe

Close the small isolation valves on the pipes under the tap (or the mains stopcock if there are none), then open the tap to let the standing water out and confirm it's dead. Plug the waste outlet with a cloth — not for water, but because a dropped screw down an open drain is how a ten-minute job becomes an hour. Lay parts out left to right in the order they came off: reassembly is just the film run backwards.

Identify which tap you own

Traditional compression taps (separate hot and cold, stiff turns) have a washer on the end of a spindle — unscrew the coloured cap, loosen the spindle, lift the headgear out, swap the washer and (while you're there) check the seat for scoring. Single-lever mixers hide a cartridge: the whole cartridge lifts out and a new one drops in — take the old one to the hardware shop and match it exactly. Ceramic-disc taps swap the disc unit the same way. Ball faucets (common in the US) use a rebuild kit with seals and springs. One trip with the old part in your pocket beats three trips with a phone photo.

When to stop and call a plumber

Stop when: there's no working isolation valve and the stopcock won't close either (a plumbing fault in itself — that's a call, not a wrestling match); fittings are corroded or seized (sheared spindles turn small jobs into big ones); the drip survives a full rebuild (the seat or body may be worn past repair); or the leak is from anything that isn't a visible fixture — a stain spreading on a ceiling or wall is not a tap problem, and it's on the clock. And anything involving the boiler, the supply pipe coming into the house, or work inside walls belongs to a professional — the same boundary discipline as every page on this desk. (UK readers: repairing an existing tap is ordinary DIY and needs no notification — the UK/US rules guide covers the few jobs that do.)

The habit this job builds

The sequence — isolate, open-and-verify, dismantle with your eyes, replace like-for-like, test slowly — is the same for a tap, a showerhead, a cistern flapper and most of the safe end of home plumbing. Do it once and you'll stop fearing water; fear water the right amount, and it never gets to surprise you.

Reviewed September 2026 · general information, not professional advice.