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Porch Subsidence
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Porch subsidence repair checker

Pick through a handful of questions about what you have observed at your property. The tool gives a preliminary read on how likely the signs are to reflect structural ground movement rather than something more benign. It is not a diagnosis: only a site investigation by a qualified specialist can confirm what is happening below the foundations.

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Check it yourself

Could it be subsidence?

Pick through a handful of questions about what you have observed at your property. The tool gives a preliminary read on how likely the signs are to reflect structural ground movement rather than something more benign. It is not a diagnosis: only a site investigation by a qualified specialist can confirm what is happening below the foundations.

Have you noticed diagonal cracks wider than a 10p coin (about 3mm), often near doors, windows or corners?
Do the same cracks appear both inside and outside, or in the same place on different floors?
Have doors or windows started sticking, or do gaps show around the frames?
Is there a large tree close to the house, or has the area had a very dry spell lately?
Has the cracking appeared or widened in the last year?

An indication only, not a confirmed finding. Request an assessment to have a specialist visit the property and set out exactly what is happening.

What each level means

  1. Low likelihood The signs you have listed are slight and frequently trace back to non-structural causes, such as moisture loss in new plaster or normal building movement across seasons. Keep a photographic record and revisit if anything changes.
  2. Possible The combination of signs is worth a professional assessment before long. A specialist visit will clarify whether anything structural is occurring and identify what, if any, action is appropriate.
  3. Worth investigating These signs may point to active ground movement. Arranging an assessment promptly gives you the best chance of keeping any remedial work proportionate to what is actually found.

Look-alikes

  • Seasonal movement: Cracks that widen and then close again with humidity or temperature shifts are usually the building responding to normal conditions rather than the soil moving below.
  • Plaster shrinkage: Very fine surface crazing across plaster or render is typically a drying phenomenon and carries no structural significance.
  • Old settlement: Settlement that occurred decades ago and has been stable ever since is historical, not active movement.

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