Quick answer
In a flat, the stopcock may be inside a service cupboard, under a sink or near the meter; newer homes may have a labelled utility or kitchen valve. Ask the building manager if the supply is shared, and never force an unfamiliar valve.
Flats and apartments
Look in the kitchen sink unit, utility cupboard, hallway service cabinet or near an internal water meter. Some buildings have individual isolation valves in a communal riser cupboard, while other arrangements include shared pipework. The main building shut-off is not necessarily intended for residents to operate.
Ask the managing agent, landlord or building manager for the location and operating instructions. Make sure you know which valve controls your flat rather than a neighbour's or the whole building's supply.
New-build properties
Check the handover pack, plumbing plan and labels in kitchen or utility cupboards. A newer property can have a conventional stopcock, a lever-operated valve or separate isolators for appliances. Do not assume that a small isolation valve is the whole-home shut-off.
If the home is still within a developer or warranty period, follow the relevant reporting route for a fault. Keep labels and access panels clear so the valve can be reached quickly.
Safe checks
- 1Ask the responsible person to identify the correct valve and whether it serves only your home.
- 2If permitted and clearly identified, turn it gently by hand and check a cold tap for a change in flow.
- 3If it is stiff, leaking or unclear, stop and request a plumber or building manager's help.
- 4Record the location and share it with other occupants once confirmed.
When to call a plumber
- You cannot tell which valve serves your flat.
- The only accessible valve is in a locked communal area.
- A valve is stiff, damaged or leaking.
- A leak affects multiple flats or communal areas.