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What to do if…
you discover a large hole or soft spot in an interior wall that seems to be expanding

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy UK guide

Short answer

Treat it as a possible leak, electrical hazard, or building safety issue. Keep people away, reduce water and electrical risk only if safe, and contact your landlord or appropriate qualified help promptly.

Do not do these things

  • Don’t press, poke, kick, or test the soft area with force; weakened plaster or plasterboard can fail suddenly.
  • Don’t cut a larger opening yourself if pipes, wiring, a flue, or damp material could be behind it.
  • Don’t touch sockets, switches, light fittings, appliances, or the consumer unit if they or the surrounding area are damp or wet.
  • Don’t use open flames, portable gas heaters, or high heat close to a damp or damaged wall.
  • Don’t let children or pets near the damaged area.
  • Don’t put furniture, boxes, or heavy items against the damaged wall.

What to do now

  1. Make a safer zone. Keep people and pets away from the wall. Move valuables, furniture, and electrical items away if you can do this without touching the damaged area.
  2. Look for active leak signs without disturbing the wall. From a safe distance, check for fresh dampness, dripping, hissing, a widening wet patch, warped skirting, swollen flooring, or water tracking along the floor.
  3. If water is present or you suspect a leak, turn off the water if safe. Use the internal stop tap or stopcock if you can reach it safely and it is dry. Do not force a stuck stop tap.
  4. Reduce electrical risk if moisture is near electrics. Do not touch wet sockets, switches, lights, appliances, or cables. If you can safely reach a dry consumer unit, switch off the affected circuit, or the whole supply if you cannot identify the circuit. If the consumer unit or the route to it is damp or unsafe, keep away and call a qualified electrician.
  5. Call for urgent help if there is immediate danger. If anyone may be injured, trapped, or at immediate risk, call 999. If there is electricity network danger or a power supply emergency, call 105 in England, Scotland, or Wales, or 03457 643643 in Northern Ireland.
  6. Record what you can safely see. Take photos or video from a safe distance. Note the time, whether the hole or soft spot is expanding, and any damp smell, staining, new cracks, bulging, or ceiling sagging nearby.
  7. If you rent, tell the landlord or agent immediately in writing. Include the photos, when you first noticed it, and that it appears to be expanding. Ask for urgent inspection and repair, and keep a copy of the message.
  8. Get the right assessment. If it looks like a leak, contact an emergency plumber. If the wall is bulging, bowing, cracking quickly, near a ceiling sag, or close to a door that suddenly jams, arrange a suitably qualified building professional promptly.
  9. If the structure may be dangerous to you or others, contact the local council. In England and Wales, you can use the GOV.UK dangerous building or structure reporting service. In Scotland or Northern Ireland, contact your local council and ask for the dangerous buildings, building standards, or building control route.

What can wait

  • You do not need to decide the full repair plan now.
  • You do not need to identify the exact cause yourself.
  • You do not need to strip wallpaper, pull away plaster, or open the wall today.
  • You do not need to argue about liability, insurance, deposit deductions, or long-term repairs in the first moments.
  • You do not need to start major cleaning of suspected mould until the moisture source and safety risks have been assessed.

Important reassurance

A spreading soft spot or hole in a wall can feel alarming, but the first protective steps are simple: keep away, reduce water and electrical risks only where safe, record what is happening, and get qualified help involved.

Scope note

These are first steps only. Later decisions about repair methods, mould treatment, insurance, landlord responsibilities, freeholder involvement, or disputes may need specialist help.

Important note

This is general information only. It is not legal, medical, financial, therapeutic, building, electrical, plumbing, surveying, or other professional advice.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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