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Underpin your foundations.
Subsidence-driven underpin — engineer designed, building-control signed off, with movement monitoring.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any groundworks starts on foundation Underpinning.
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Inadequate diagnosis
Subsidence misdiagnosed. Sometimes drains or pipes cause apparent subsidence.
Insurance battles
Insurance may dispute coverage. Loss adjusters analyse claim.
Settlement post-work
Some settlement after underpinning is normal. Decorative damage may need repair.
Cost escalation
Underpinning often costs more than estimated. Hidden conditions revealed.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Standard mass concrete underpinningPer metre
£1k–£3.5k
Piled underpinningPer metre, premium
£2k–£5k
Structural engineer designFor project
£2k–£10k
Soil investigationPre-design
£1k–£5k
Whole-house underpinning20m+ of wall
£15k–£80k
Insurance claim underpinningInsurance pays if covered
£1–£1
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Groundworks explained
Underpinning extends existing foundations deeper to stabilise sinking buildings. Subsidence remediation. Expect to pay £1,000–£5,000+ per metre for UK foundation underpinning.
What Does the Work Involve?
Structural engineer designs underpinning. Existing foundation accessed. Section excavated under foundation. New concrete poured to depth. Repeated section by section ("pin" by "pin"). Foundations now sit on new deep concrete. Insurance company often manages process.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Standard mass concrete underpinning | 1,000 | 3,500 | Per metre |
| Piled underpinning | 2,000 | 5,000+ | Per metre, premium |
| Structural engineer design | 2,000 | 10,000 | For project |
| Soil investigation | 1,000 | 5,000 | Pre-design |
| Whole-house underpinning | 15,000 | 80,000+ | 20m+ of wall |
| Insurance claim underpinning | 0 | 0 | Insurance pays if covered |
| Restoration of internal damage | 5,000 | 30,000+ | After settlement |
How Long Does It Take?
Single wall: 4-8 weeks. Whole house: 3-6 months.
DIY or Professional?
Specialist underpinning contractor only. Structural engineer essential.
Choosing the Right Tradesperson
Specialist underpinning company. CICAir or similar accreditation. Insurance-approved if claim.
UK Regulations
Building Regs Part A. Major structural work. Building inspector approval throughout.
Common Problems
- Inadequate diagnosis: Subsidence misdiagnosed. Sometimes drains or pipes cause apparent subsidence.
- Insurance battles: Insurance may dispute coverage. Loss adjusters analyse claim.
- Settlement post-work: Some settlement after underpinning is normal. Decorative damage may need repair.
- Cost escalation: Underpinning often costs more than estimated. Hidden conditions revealed.
Frequently Asked Questions
Signs I need underpinning?
Cracking walls (especially diagonal), doors sticking, floors sloping, gaps between bricks. Structural engineer diagnosis.
Will insurance pay?
Subsidence is insured risk under buildings insurance. Subject to excess (often £1,000+). Most claims accepted.
How long does underpinning last?
Once stabilised: indefinite. Successfully underpinned house can last 100+ years more.
Mass concrete vs pile?
Mass concrete: standard, cheaper, suits typical soils. Pile: for very deep firm strata. Pile more expensive but more stable.
Cost for whole house?
20m+ wall: £20,000-£80,000+. Major investment. Insurance usually covers if subsidence covered.
Will it resolve cracks?
Yes — once stable, cracks can be repaired. May reappear if not underpinned fully. Decoration after stable.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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