What causes subsidence?
Common causes include shrinkable clay soil, tree root moisture demand, leaking drains, washed-out ground, poor compaction, historic mining or made ground and shallow foundations on older properties.
Resource guide
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.
UK-wide Scotland to Cornwall
5.0 Google review rating
FMB member contractor
How serious is it?
Some movement is historic or minor, but active subsidence should be investigated quickly. The longer the foundation lacks support, the greater the chance of wider structural and cosmetic damage.
How is it repaired?
The right repair depends on the cause. Options can include drain repair, vegetation management, resin injection, ground stabilisation, foundation strengthening or traditional underpinning.
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.
Signs of Subsidence
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.
Read more
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
What Is Subsidence? FAQs
Straight answers before you book a survey.
What is the first sign of subsidence?
Fresh diagonal or stepped cracks are common early signs, especially around doors, windows and extensions.
Can subsidence be fixed without underpinning?
Often, yes. Where the issue is suitable for resin injection, foundations can be stabilised without major excavation.
Should I call my insurer?
If you believe your home is actively subsiding, check your policy and consider speaking with your insurer. We can still help you understand the practical repair route.