Tap Won't Turn Off — What to Do Right Now
A tap that won't shut off can flood a room quietly overnight. Isolate the water first, then get a plumber out — the fix itself is usually quick.
Make it safe — before anything else
Isolate at the tap first
Modern installs have a chrome or plastic isolation valve on each supply pipe under the sink. Quarter-turn with a flat screwdriver = off.
Fall back to the stopcock
If there are no isolators or they're seized, close the main stopcock. The whole house loses water — that's fine, it stops the flood.
Open the tap fully to drain
This empties the trapped water in the supply pipes and the tap stops within a minute.
Don't force the handle
If the tap handle just spins or feels loose, the cartridge is toast. Turning harder can strip the spindle and make removal harder for us.
What Kevin (our AI) will check first
Message Kevin and he'll ask exactly these questions before we send an engineer, so we bring the right parts on the first van.
- Brand and style of tap — quarter-turn ceramic, mixer, monobloc, traditional compression?
- Is the handle loose, seized, or just not shutting the water?
- Any visible leak from the spout, base of the tap, or under the sink?
- Age of the tap — cheaper own-brand taps often need full replacement rather than a cartridge swap.
- Are the isolation valves working, or do we need to replace those too?
Common causes of a tap won't turn off
Failed ceramic cartridge
The quarter-turn ceramic disc inside the tap has worn or cracked. Standard replacement, usually £8 – £25 for the cartridge plus labour.
Perished washer (traditional tap)
Old-style compression taps use a rubber washer against a brass seat. Washers perish; sometimes the brass seat is scored and needs re-cutting or the whole valve replaced.
Stripped spindle
If the handle spins freely, the spindle is stripped. Cartridge swap for modern taps, or full tap replacement for cheaper units.
Debris in the seat
Grit from a mains repair or an old system can jam the tap open. Strip, clean, reassemble — often no parts needed.
Frozen or damaged tap body
Outside taps and garage taps can freeze and split the body internally. Usually a full replacement.
Honest cost band — why we won't quote blind
Typical
£85 – £180 for a cartridge or washer swap on a standard tap
Complex
Full tap replacement £160 – £380 depending on tap style (mixer / monobloc / designer).
'Won't turn off' can be a £10 washer or a stripped monobloc that needs the whole tap replaced — no honest plumber quotes that from a message alone.
Fixed £50 diagnostic
Flat fee. No hourly meter running.
Fair quote or refund
Transparent pricing — refunded if we don't fix it.
Vetted UK engineers
DBS-checked, insured, real reviews.
AI-triaged in seconds
KJ chats first so the right engineer arrives.
Related emergencies
See all in the emergency plumbing hub — or the leaks & water damage hub.
Areas we cover for tap won't turn off
Same-day across Greater Manchester and Rochdale.
Tap won't turn off — FAQs
Dealing with a tap won't turn off? Chat with Kevin now
Real triage in seconds. £50 diagnostic visit — refunded if we don't fix it.
Related hubs: emergency plumbing, leaks & water damage, all services.
Chat with Kevin about Tap won't turn off