Repair a stopcock.

Stopcock repair or replacement in the UK typically costs £100–£300 depending on location, condition, and accessibility. The stopcock (also called the main stop tap or stop valve) is the master shut-off for the cold water supply to your home — every house has at least one inside (under the kitchen sink usually) and one outside (in a buried cover, typically near the property boundary).

Most homes ignore the stopcock for years; when an emergency strikes (burst pipe, major leak), people discover the internal stopcock has seized solid. A working stopcock is one of the most important plumbing items in your home — test it annually.

Typical UK stopcock costs

Locations of stopcocks in UK homes

• Internal stopcock — under kitchen sink (most common), in airing cupboard, under stairs, in cellar, or in garage. The point where the water service pipe enters the house.
• External stopcock — under a small metal or plastic cover in your front garden, driveway, or pavement. Property boundary typically. Requires a stopcock key (£5-£15 from any merchant) to operate.
• Water meter (if external) — usually has its own stop tap nearby. Allows isolation between your supply and meter.

Common stopcock problems

• Seized open — the most common issue. Stopcock hasn't been moved for years and the spindle has corroded fixed. Often releases with penetrating oil and gentle force; sometimes needs replacement.
• Seized closed — stopcock turned off and won't reopen. Usually replacement.
• Drips when closed — failed washer inside the valve. Replace the gland packing or the whole stopcock.
• Leak from spindle — gland packing failed. Tighten gland nut or replace.
• Stopcock won't fully close — internal seat damaged. Replacement.
• External cover missing or buried — locate and uncover; sometimes water company assistance needed.

Why a working stopcock matters

A working internal stopcock allows you to:

• Stop water immediately for any leak or burst pipe.
• Isolate water for maintenance work (washing machine, dishwasher, taps).
• Drain the system for prolonged absence (winter freeze prevention).
• Stop pressure damage during a burst event.

A stopcock that won't move during an emergency means the only option is calling the water company to shut off at the boundary — which can take hours during peak times.

Things people often miss

• Test annually — turn the stopcock fully off (no flow at any tap) then fully on again. Catches seizing before it becomes critical. Five seconds of effort, potentially saves thousands in flood damage.
• External stopcock key — every household should have one. £5-£15 from B&Q, Wickes, Toolstation. Keep with your house keys.
• Position labelling — once you've identified your internal stopcock, label it clearly. Easy to find in panic.
• Direction of flow — most stopcocks have an arrow on the body indicating flow direction. Replacement must match this direction.
• Lever vs spindle — old screw-type stopcocks need rotating many turns; modern lever stopcocks (ball valve) close with a quarter turn. Lever versions are much faster in emergencies; consider upgrading at next opportunity.
• Multi-storey homes — sometimes have multiple stopcocks (kitchen + boiler room + utility). Know all locations.

Frequently asked questions

Want a local pro to handle this? A plumber will diagnose, replace, and add modern isolation valves while they're there. £150-£250 for a working stopcock is excellent insurance against potential burst-pipe damage that could otherwise cost thousands.