How much does it cost to underpin a house?
Underpinning is major structural work priced by the length of wall treated. Get an indicative figure below — and get an engineer involved early.
What underpinning involves
- 1Diagnose the movement
A structural engineer establishes the cause (subsidence, heave, poor foundations) and whether underpinning is the right fix — sometimes it isn't.
- 2Design and consent
The engineer designs the solution and it goes through building control; party wall agreements often apply.
- 3Execute in sequence
Foundations are extended down in a carefully sequenced pattern (traditionally in bays) to keep the structure supported throughout.
Underpinning is the big-ticket structural fear on a survey — expensive, disruptive and engineer-led. It can also be an opportunity: a property that scares off mortgage buyers because of movement can be a cash-buyer refurbishment play, if the cause is understood and costed.
Underpinning costs (indicative)
| Scope | Basis | Indicative cost |
|---|---|---|
| Traditional underpinning | per linear m | £1,500 – £3,000/m |
| One corner / bay | ~3–5 m | £5,000 – £15,000 |
| Full elevation | ~8–10 m | £15,000 – £30,000 |
| Structural engineer + monitoring | essential | £1,000 – £3,000+ |
Major structural work — always led by a structural engineer. Insurance may cover subsidence; check before you start.
Frequently asked questions
How much does it cost to underpin a house?+
Traditional underpinning costs roughly £1,500–£3,000 per linear metre, so one corner is often £5,000–£15,000 and a full elevation £15,000–£30,000. It's major structural work — always engineer-led.
Does insurance cover underpinning?+
Buildings insurance often covers subsidence-related underpinning (subject to an excess), but not pre-existing or uninsured causes. If you suspect subsidence, involve your insurer and a structural engineer before any work.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.