Warning signs
Look for cracks close to drain runs, damp or sunken ground, recurring blockages, localised settlement and movement near bathrooms, kitchens or external gullies.
Resource guide
Drain Leaks and Subsidence
Leaking drains can soften, wash out or undermine soil beneath foundations. If the leak is repaired but the voided ground remains, movement can continue or cosmetic repairs can fail.
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Repair sequence
The drain problem should be identified and repaired. Resin injection can then fill voids and improve support around the affected foundation or slab.
Why speed matters
Water can keep moving soil. Early action reduces the chance that a local drain issue becomes a wider foundation problem.
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.
Read more
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 moreFAQ
Drain Leaks and Subsidence FAQs
Straight answers before you book a survey.
Should I get a CCTV drain survey?
If drains are suspected, a CCTV survey can be very useful evidence before designing the ground stabilisation work.
Can resin be injected near drains?
Yes, where appropriate, but the drain condition and repair sequence need to be understood.
Will resin fix the drain?
No. Resin stabilises ground. Any defective drain should be repaired by a drainage specialist.