A leak is a difficult time to search behind cupboards for an unfamiliar valve. Knowing the location of your inside stop tap can make it easier to follow the water company or plumber's advice, particularly if the property has a shared supply.

Ask about the actual property
Use your water company's guidance and ask the landlord or building manager if you are unsure which valve serves your home. Thames Water's guide notes that layouts and shared supplies vary. Do not assume the valve under a neighbour's sink tells you how your own property is arranged.
- Record the verified location in the household plan.
Keep access practical
Avoid storing heavy or awkward items in front of the identified control. Make sure responsible adults know where it is and how to obtain the appropriate instructions. If it is inaccessible, damaged or difficult to operate, arrange suitable professional advice rather than forcing it, using improvised tools or disturbing unfamiliar plumbing.
- Keep the water company and approved plumber contact available.
Respond to a problem safely
Follow the relevant provider's advice if a leak or supply interruption occurs. Water near electrical equipment or a damaged structure needs appropriate professional or emergency attention; do not reach into an unsafe area to use a valve. If the supply is shared, involve the responsible building organisation so other residents are not affected by an uninformed action.
- Review the location after plumbing changes or moving home.
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