Step by step

  1. Locate the main valve

    Trace the incoming water supply where practical. Ask your landlord or water company if you cannot find it.

  2. Test it gently

    Turn the valve clockwise without forcing it. Check a cold tap to confirm the flow stops, then reopen it.

  3. For an active leak

    If safe, turn off the main water supply and catch or contain escaping water.

  4. Protect the area

    Keep clear of wet electrical fittings. Arrange a plumber for the repair and document damage if needed.

Know when to stop

When to stop and call a professional

Stop if the valve is seized or leaks, the water will not shut off, or water is close to electrics. Keep clear and call the appropriate professional or emergency service.

General information for a UK home; always follow your product instructions and current local rules. Images are illustrative, not technical diagrams.