Where is the stopcock in a Scottish flat? Find it before you need it

If a pipe starts leaking, the first useful thing to know is which valve stops water entering your home. In many flats it is under the kitchen sink or close to where the supply pipe comes in. In an older tenement, there may be more than one valve, or a shared shut-off elsewhere in the building. Find yours on a quiet day, check what it controls, and tell the people you live with where it is.

You do not need to dismantle a cupboard or turn an unknown valve in the close to do this. A plumber can trace a confusing supply while everything is dry. Scottish Water’s advice for frozen or burst pipes starts with turning off the stop valve; knowing where it is makes that advice possible in an emergency.

Start where the water enters your flat

Look under the kitchen sink first, then in a utility cupboard, beside a boiler or hot-water system, or near the point where a supply pipe enters the flat. You are looking for a valve on the incoming water pipe, often with a small wheel or lever. Take a torch and follow the pipe as far as you can see without removing fixed panels.

A small slotted valve on the flexible hose to one tap is usually a local isolation valve. It can be handy for that fitting, but it may not turn off the whole flat. Likewise, a valve beside a radiator belongs to the heating circuit, not necessarily the incoming water supply. If the pipework is unclear, do not guess.

Older flats can have separate routes for a kitchen cold tap, a stored-water system and heating. That is why finding a handle is only half the job: you need to know what actually stops when it is closed.

Check it gently while there is no leak

Choose a time when you can restore the supply if everything works. Let others in the flat know, then:

1. Take a photo of the valve and its location. Check for an existing label before touching it.
2. Turn the suspected flat-only stop valve gently towards closed. Many wheel valves close clockwise; a lever valve works differently. Stop if it is stiff, damaged or starts to drip. Do not use tools to force it.
3. Open the kitchen cold tap briefly. If the flow stops, that is useful evidence that the valve controls that supply. Check other cold taps too; some older layouts have separate feeds.
4. Reopen the valve gently and confirm the taps run normally. Label the valve with what you have actually tested, then save the photo somewhere everyone in the home can find it.

If the water keeps running, the valve may only serve one branch, may not close properly, or may not be the main shut-off. Ask a plumber to identify it and repair a seized or leaking valve. Do not leave a suspect valve half-closed and hope it will work during a burst.

What changes in a tenement or other shared building?

Scottish Water says flats and older terraced homes may have a shared supply. A valve in a close, cellar or outside may affect neighbours as well as you. A flat may also have its own valve downstream. The arrangement varies from building to building.

If you cannot find a flat-only shut-off, ask the factor, previous owner or neighbours whether they know the route, then have a plumber verify it. Record who can access any communal valve and how to reach them. Do not test an unidentified communal valve by cutting off other homes. Water Regs UK recommends accessible, labelled stop valves for flats and communal use, which is a useful standard to discuss with a plumber or factor when the current arrangement is awkward.

If a leak is already affecting more than one flat, tell the neighbours and factor promptly. Let the plumber know that the supply may be shared before they plan to isolate it.

If water is already escaping

Turn off the stop valve you have identified. Scottish Water then advises opening cold taps to drain the system; its frozen-pipe guidance warns against opening hot taps when a pipe is frozen and a hot-water cylinder may be involved. The right next steps depend on whether you have a frozen pipe, a burst pipe or a different leak, so use that guidance and call a plumber if unsure.

Keep clear of any water near sockets, wiring or a consumer unit. Do not touch wet electrical equipment. If safe isolation is in doubt, get an electrician’s help as well. If the valve will not move or the leak continues after shut-off, call an emergency plumber and explain what you have tried.

Before cold weather, Scottish Water’s winter checklist is also worth a look for exposed pipes, loft tanks and homes left empty. This stop-valve check is one small part of being ready; it does not stop a pipe freezing.

What to ask a plumber to sort out

If you could not confidently isolate your flat, give the plumber a clear brief: find the incoming supply, show me every shut-off, test which taps each one controls, and quote for making any failed or inaccessible valve usable. Ask them to label the result. In a shared building, agree with the factor and neighbours before work that needs a communal shut-off.

You can browse plumbers across Scotland or look at the Edinburgh plumber guide and Glasgow plumber guide if you need someone local. For work on drinking-water plumbing, WaterSafe explains how to find an approved plumber. Tell anyone you call whether this is a live leak or a planned check; those are very different jobs.