In 40 seconds
Underpinning a house in the UK typically costs somewhere between £6,000 and £21,000+, with many standard semi-detached jobs landing around £10,000–£15,000 for the common mass-concrete method. Per linear metre of affected wall, traditional mass-concrete underpinning usually runs about £1,000–£2,000 per metre, rising further for deep, complex or London jobs. It is worth keeping the scale in perspective: only around 10% of properties with subsidence actually need underpinning — many are stabilised in less drastic ways. If the movement is caused by subsidence and you hold buildings insurance, the repair is often covered by a subsidence claim, usually subject to a higher excess. The honest answer is always a range, because it depends on your property, the cause and the depth of work.
Subsidence and underpinning are stressful subjects, and a lot of the guidance online is published by firms selling the work. The pages below give calm, sourced cost ranges, explain the signs that genuinely point to underpinning, set out how it affects value, and walk through the insurance and subsidence-claim route — before you commit to anything.