Cracks to watch
Diagonal cracks from the corners of doors and windows, stepped brickwork cracks, cracks wider than a few millimetres and cracks that continue through internal and external walls deserve attention.
Resource guide
Signs of Subsidence in a House
Subsidence does not always look dramatic at first. Small changes that repeat, widen or appear in clusters can be more important than one isolated hairline crack.
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Doors, windows and floors
Sticking doors, racked frames, sloping floors, gaps around skirting boards and windows that suddenly stop closing can all point to movement.
What to do next
Take dated photos, note whether the crack is changing, check for nearby drain issues or trees and request an assessment before carrying out decorative repairs.
Free initial advice
Turn the guide into a repair plan
If the symptoms match your property, the next step is a practical assessment.
Keep reading
Related foundation repair guides
Useful resources linked to this topic.
What Is Subsidence?
Subsidence is downward movement of the ground that causes part of a building to lose support. It can create cracks, distortion, uneven floors and problems with doors or windows.
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Resin Injection vs Underpinning
Underpinning is well known, but it is not the only way to stabilise a building. Resin injection is a modern alternative for suitable ground improvement and foundation strengthening projects.
Read more
Foundation Repair Costs
Foundation repair pricing depends on the cause, the size of the treatment zone, access and the evidence required. A quick quote without understanding the property is rarely helpful.
Read moreFAQ
Signs of Subsidence FAQs
Straight answers before you book a survey.
Are hairline cracks subsidence?
Not always. Hairline cracks can be shrinkage or plaster movement, but repeating or widening cracks should be checked.
How fast do subsidence cracks grow?
It varies. Some move seasonally, some move after drainage failures and some remain static. Monitoring and survey evidence help establish activity.
Can I send photos first?
Yes. The get started form lets you upload photos so we can understand the issue before arranging the next step.