Canterbury & Kent

Can Subsidence Be Fixed Without Underpinning?

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A subsidence diagnosis triggers one fear above all others: underpinning — months of disruption and a bill that can pass £50,000. Here is the reassuring truth from surveyors who investigate movement across Canterbury and Kent every month: most subsidence cases today are resolved without underpinning at all.

Why underpinning is now the last resort

Modern practice treats the cause, not just the symptom. The majority of movement on Kent’s shrinkable clays is driven by two fixable culprits: vegetation — trees and large shrubs drawing moisture from beneath foundations — and leaking drains washing fines out of the supporting ground. Remove or manage the tree, repair the drain, and the ground typically restabilises; the building is then monitored and repaired cosmetically. Insurers prefer this route too, because it works and costs a fraction of excavation.

What is underpinning, and when is it genuinely needed?

Underpinning extends foundations down to stable ground — traditional mass-concrete bays dug in sequence, or piled systems for deeper problems. It becomes necessary when movement is progressive despite cause-removal, when foundations are exceptionally shallow, or where made ground cannot be stabilised. That is a minority of cases — but the only way to know which you have is investigation, not guesswork.

Getting the right diagnosis

A subsidence survey establishes cause, severity and trend — often with crack monitoring over a season — while a structural crack assessment gives a fast first answer on whether cracking is historic or live. If drains are suspected, a CCTV drain survey finds the leak the same week. Worried about movement anywhere in Canterbury or Kent? Get in touch or call 0204 579 8270 — diagnosis first, underpinning only if the evidence demands it.