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uk Home & property emergencies loose chimney bricks • chimney bricks moved • shifted masonry on wall • loose masonry exterior wall • bulging brickwork • bricks falling risk • mortar crumbling suddenly • wobbling chimney stack • leaning chimney concern • cracked mortar joints outside • loose stonework on house • brickwork looks unstable • pieces of wall coming loose • after storm brickwork moved • after freeze thaw damage • house exterior bricks shifted • masonry movement sudden • worried about falling bricks • chimney looks unsafe • wall looks like it moved

What to do if…
you notice bricks or masonry on a chimney or exterior wall have become loose or shifted

Short answer

Treat it as a falling-object and potential collapse risk: keep people away from the area underneath and arrange an urgent inspection by a competent professional.

Do not do these things

  • Don’t go onto the roof, climb ladders, or “test” the bricks by pushing/pulling them.
  • Don’t remove “just one loose brick” or chip out mortar to “see how bad it is”.
  • Don’t do a quick DIY patch (random mortar, foam, sealant) to “stick it back” — it can hide instability and make the situation less safe.
  • Don’t use a fireplace/wood burner/open fire if the chimney stack or chimney breast seems involved.
  • Don’t keep using any appliance that vents through a chimney/flue you suspect is damaged.
  • Don’t park, stand, or let anyone pass directly below the affected area “just for a minute”.

What to do now

  1. Create a no-go zone immediately. Keep everyone (including pets) away from the area beneath the loose/shifted masonry and away from any route directly next to it (doorways, paths, driveway). Mark it clearly (bins, chairs, tape) so people don’t wander in.
  2. Move vulnerable things away. If it’s safe to do so quickly, move cars, bikes, and garden furniture out from under/next to the area.
  3. Stop using anything that relies on that chimney/flue. If the chimney is involved, do not light fires and don’t use any appliance that vents through that flue until it’s checked. If you have a carbon monoxide (CO) alarm, make sure it’s on and working; if it sounds, leave the property and call 999.
  4. Check for “immediate danger” signs from a safe distance. If bricks/mortar are actively falling, the wall/chimney is visibly leaning more, you hear sudden cracking, or it’s over a public footpath/road and looks like it could fall soon: call 999 (immediate risk to people).
  5. Report it to your local council if it may endanger the public. If the unstable masonry could affect a pavement/road/public area, contact your local council Building Control / dangerous structures service (many councils have out-of-hours options) and report it as a potentially dangerous structure.
  6. Arrange an urgent inspection/repair. Contact a competent roofer/chimney specialist for chimney issues, or a builder/structural engineer for wall movement/bulging/cracking. Tell them: what moved, where it is, whether anything is falling, and whether it’s above a public route.
  7. Document safely for insurance and contractors. Take photos/video from a safe distance (no ladders). Note when you first noticed it, and any recent trigger (storm, high winds, freeze/thaw, nearby works, impact).
  8. If you rent: notify your landlord/agent in writing right away, and say you’ve made a no-go zone due to a falling-masonry risk.
  9. If you smell gas (or suspect a gas flue issue): don’t investigate—follow gas emergency instructions and call the National Gas Emergency number (0800 111 999) from outside.

What can wait

  • You do not need to decide today whether it’s a full rebuild versus a repair — first you need it made safe and assessed.
  • You do not need perfect measurements or to diagnose the cause.
  • Non-urgent cosmetic work (matching bricks, repainting, tidy repointing for appearance) can wait until after the safety fix.

Important reassurance

It’s normal to feel a surge of panic because “it could fall” feels immediate and uncontrollable. Most situations become much safer quickly once the area is kept clear and the right professional assesses it — your job right now is simply to prevent anyone being underneath it and to get it checked.

Scope note

These are first steps to reduce risk and buy time. The right repair (repointing, rebuilding a section, chimney repairs, addressing damp or movement) depends on an on-site assessment.

Important note

This is general first-step information, not a diagnosis or professional advice. If you think there is an immediate danger to people, treat it as an emergency and contact emergency services.

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