Your stopcock is often found under the kitchen sink, but it can also be in a downstairs toilet, utility room, airing cupboard, under the stairs or near where the water pipe enters the building. Knowing where it is matters because it lets you turn off the water quickly if a pipe bursts or a leak starts.
It is also worth checking that it turns, so a stiff or faulty stopcock can be put right before an emergency. A few minutes spent now can save a lot of stress later.
Where to Look
The stopcock is usually on the main cold water pipe, close to where it comes into the property. Common places include:
- Under the kitchen sink
- In a downstairs toilet or cloakroom
- In a utility room or garage
- Under the stairs or in a cupboard near the front door
- Under floorboards near the entry point in some older homes
Some homes have more than one valve on the incoming pipe, so it is worth checking which one actually controls the supply to the whole property.
In flats, the stopcock may be inside the flat or in a shared area, such as a cupboard in the hallway. Your landlord, managing agent or building manager may be able to tell you where it is.
Why It Matters
If you are moving into a new home, finding the stopcock is worth doing early, as previous owners may have hidden it behind boxing or stored items in front of it.
If a pipe bursts or a leak starts, turning off the stopcock can stop the water and limit damage while you get help. Searching for it during an emergency can waste valuable time.
WaterSafe advises making sure everyone in the household knows where the internal and external stop taps are. The outside stop tap is often under a small cover near the property boundary, although not every home has one that is easy to use.
Check It Turns, Gently
Once you have found it, it is worth checking that it turns. Turning it clockwise usually closes it. Try it gently by hand and then open it again fully. Do not use tools or force it if it will not move.
If it is very stiff, leaks when turned, or does not seem to stop the water, it may need attention. These faults are often easier to deal with before an emergency than during one.
If Your Stopcock Has a Problem
Make a note of where it is and what you found, and keep the area around it clear so it can be reached quickly. A simple label on the cupboard door can help others in the home find it. Our page on professional stopcock repairs explains how stiff, leaking and faulty stopcocks are assessed and repaired.
If you cannot find your stopcock or it does not turn properly, a plumber can help locate it and explain whether it needs repairing.