PanicStation.org
UK USA
uk Home & property emergencies suspect burst pipe • pipe burst behind wall • leak under floorboards • hidden water leak • sudden damp patch • water stain on wall • ceiling leak from above • floor swelling water • hissing in wall • water meter spinning • stop tap where is it • turn off water supply • boiler off after leak • water near electrics • emergency plumber needed • landlord leak repair • flat leak to neighbours • how to shut off stopcock • unexplained water pressure drop • dripping sound in wall

What to do if…
you suspect a pipe has burst behind a wall or under a floor

Short answer

Turn off your water at the main stop tap/stopcock, then keep electricity away from any wet area. Once water is isolated and it’s safe, get a qualified plumber involved and start limiting water damage.

Do not do these things

  • Don’t ignore it “to see if it dries out” if you suspect an active leak (damage can escalate quickly).
  • Don’t keep the heating/boiler running if you suspect a burst or major leak.
  • Don’t touch sockets, switches, light fittings, or appliances in a wet area.
  • Don’t cut into walls/floors in a panic (you can hit electrics, worsen flooding, or damage pipes further).
  • Don’t force a stuck stop tap/stopcock (it can snap).

What to do now

  1. Pause and check for immediate hazards. If water is pooling near sockets/lights, keep people and pets out of that area.
  2. Shut off the water at the main stop tap/stopcock.
    • Common locations include under the kitchen sink, near where the water pipe enters the property, or in a cupboard by the front door.
    • Turn clockwise to close.
  3. Turn off your boiler/heating. This helps prevent further circulation and reduces risk if the system is affected.
  4. Make electrics safer if water is near electrical points.
    • Only if you can reach it without going near/through water, switch off power at the consumer unit (fuse box), at least for the affected circuits.
    • If you can’t reach it safely or you’re unsure, stay back and get qualified help.
  5. Relieve pressure and drain what you can (safely).
    • Turn on cold taps briefly to relieve pressure and help drain the system once the water is off.
    • If you’re not sure how your hot water is set up, don’t guess—stick to cold taps unless a professional advises otherwise.
  6. Limit damage right away.
    • Put towels/containers under drips or where water is emerging.
    • Move valuables, rugs, and anything that can stain or warp away from the suspected leak area.
    • If water is coming through a ceiling, place a bucket under the lowest point.
  7. If you’re in a flat or there are neighbours below/adjacent, notify them immediately. Water can travel fast through floors and ceilings.
  8. Call the right person for your situation.
    • If you rent: contact your landlord/agent and follow their emergency repairs process.
    • If you own: contact an emergency plumber (ideally one on a recognised register) and consider notifying your home insurer if significant damage is likely.
    • If the stop tap won’t turn or the leak is severe, say clearly that the water isn’t isolating.
  9. Document what you’re seeing (quickly). Take a few photos/video of damp patches, ceilings, flooring, and any visible water—then refocus on safety and containment.

What can wait

  • You don’t need to decide today whether to open walls/floors or which contractor will do repairs.
  • You don’t need to fully dry everything immediately—first stop the water and make electrics safe.
  • You don’t need perfect evidence for insurance right now—just a few clear photos and notes.

Important reassurance

Hidden leaks are common and it’s normal to feel alarmed because you can’t “see” the problem. Turning off the water and reducing electrical risk are the two biggest moves that stop this getting worse.

Scope note

These are first steps to stabilise the situation and prevent avoidable damage or injury. Repairs, drying, mould prevention, and insurance handling are next-stage tasks once the leak is controlled.

Important note

This is general information for immediate harm-prevention, not a substitute for professional assessment. If you think electrics are unsafe, treat it as a serious hazard and get qualified help.

Additional Resources
Support us