How Much Does Subsidence Repair Cost in London?
Subsidence repair is really four possible costs: diagnosis, removing the cause, repairing the damage, and, only sometimes, underpinning. Here is what each stage involves and costs in 2026.
In short: the cost of fixing subsidence depends on whether the cause can simply be removed. Diagnosis starts with a structural inspection with a full report at £495 + VAT. Where the fix is removing the cause, repairing a leaking drain or managing a tree, plus repairing the cracks, total costs are commonly in the low thousands. Where underpinning is genuinely needed, our indicative design-and-build rate is around £1,500 per metre run, and whole projects commonly run from around £10,000 to £50,000 or more. Most subsidence cases do not end in underpinning, and if you are insured, most policies cover subsidence damage with a typical £1,000 excess. Figures correct as of July 2026, every job priced by written quotation after diagnosis.
The four cost stages of subsidence repair
Subsidence worries people because the worst-case numbers get quoted first. In practice the spend arrives in stages, and each stage exists to stop you paying for the one after it unnecessarily.
| Stage | What it involves | Indicative cost |
|---|---|---|
| 1. Diagnosis | Engineer's inspection and full written report: is it subsidence, what is the likely cause, what happens next | £495 + VAT (EMA fee) |
| 2. Investigation, if needed | Trial pits to expose foundations, drain surveys, crack monitoring over time | Quoted per job; drain CCTV surveys commonly low hundreds; monitoring visits priced per schedule |
| 3. Removing the cause and repairing damage | Drain repair, tree management, then crack stitching, repointing, replastering and redecoration | Commonly low thousands in total, site-specific |
| 4. Underpinning, minority of cases | Mass concrete underpinning in sequenced bays, 1 m deep pins, design and build | ~£1,500 per metre run (EMA rate); projects commonly £10,000 to £50,000+ |
Indicative figures for budgeting only, correct as of July 2026. EMA Structures fees and rates are confirmed by written quotation; third-party costs such as drain repairs and tree works vary by contractor and site.
Stage 1: diagnosis, the £495 that protects the rest
Cracking that looks like subsidence often is not: thermal movement, plaster shrinkage, failed lintels and normal settlement produce similar symptoms. The first step is an engineer confirming whether the pattern actually indicates foundation movement, our guides to the signs of subsidence and crack types cover what we look for. A structural inspection with a full written report costs £495 + VAT and sets out the likely cause, its severity and the next step, which is sometimes simply "monitor and do nothing yet".
Stage 2: investigation and monitoring
Where the cause is not clear from inspection, the honest answer is evidence, not guesswork. Trial pits expose the foundations and the ground they bear on; a CCTV drain survey checks for leaks softening the ground; and crack monitoring over weeks or months establishes whether movement is live or historic. Monitoring feels slow, but it is dramatically cheaper than underpinning a wall that stopped moving years ago.
Stage 3: remove the cause, repair the damage
The most common outcomes are the cheapest ones. London subsidence is dominated by two causes: shrinkable clay drying out around tree roots, and leaking drains washing out or softening the ground. Where the remedy is repairing a drain or managing a tree, and movement then stops, the remaining work is repairing the damage: crack stitching and repointing, localised rebuilding where brickwork has displaced, replastering and redecorating. Repairs are specified and inspected through an engineering-led repair process so they address cause, not just appearance.
Stage 4: underpinning, the minority outcome
Underpinning is only the answer where the foundations remain unable to support the building even after the cause is dealt with, live, progressive movement that cause-removal cannot arrest. Our guide to when underpinning is needed explains how that decision is made. As a design-and-build firm we publish our indicative rate: around £1,500 per metre run for traditional mass concrete underpinning with pins to 1 m deep, covered in more detail in our basement and underpinning cost guide. How much of the building needs underpinning drives the total, one corner of a bay window is a very different project from a full flank wall, which is why whole projects range from around £10,000 to £50,000 or more.
The insurance route
Most UK buildings insurance policies cover subsidence damage, usually with a higher excess than other claims, £1,000 is typical. The insurer appoints a loss adjuster and their own consultants, and the process can be slow because it includes the same monitoring stages described above. Two things are worth knowing: you are entitled to commission your own independent engineer's report, which is useful for checking that the proposed remedy matches the actual cause; and claiming affects future premiums and the property's insurability, so for minor, clearly diagnosed cases some owners choose to repair without claiming. Check your own policy wording, cover varies.
Getting a real number
If you are seeing cracks and suspect movement, start with the diagnosis, not a repair quote. Send us photos of the cracks and we will give you an initial view, then a fixed £495 + VAT inspection and report if it warrants one. Because EMA Structures diagnoses, designs and carries out subsidence assessment, repairs and underpinning with one team, the number you get reflects how the job will actually be done.
All figures exclude VAT unless stated, are indicative and correct as of July 2026, and are not quotations. EMA Structures fees are confirmed by written quotation; third-party and insurance-route costs vary by provider and policy.
Subsidence repair cost questions
How much does it cost to repair subsidence?
It depends almost entirely on the cause and whether foundation works are needed. Where the cause can be removed, a leaking drain repaired or a tree managed, and the cracks then repaired, costs are commonly in the low thousands of pounds. Where underpinning is required, EMA Structures' indicative design-and-build rate is around £1,500 per metre run of wall with 1 m deep pins, and whole projects commonly run from around £10,000 to £50,000 or more depending on how much of the building is affected. Diagnosis comes first: a structural inspection with a full report costs £495 plus VAT, correct as of July 2026.
Can subsidence be fixed without underpinning?
Yes, and in the majority of cases it is. If movement stops once the cause is removed, for example a repaired drain or a managed tree, the remaining work is repairing the cracks and redecorating. Underpinning is only needed where the foundations remain unable to support the building after the cause is addressed, which is the minority of cases. An engineer's diagnosis, sometimes supported by a period of monitoring, is what makes that call safely.
Does buildings insurance cover subsidence repair?
Most UK buildings insurance policies cover damage caused by subsidence, typically with a higher excess than other claims, £1,000 is common. The insurer usually appoints a loss adjuster and consultants to investigate and manage the claim. You are entitled to commission your own independent engineer's report, which can be valuable for checking that the proposed remedy addresses the actual cause. Check your own policy wording, as cover and excesses vary.
How do you repair subsidence cracks?
Only after movement has stopped or the cause has been dealt with. Typical repairs are crack stitching with helical stainless steel bars bonded across the crack, repointing, localised rebuilding of displaced brickwork and internal replastering. Repairing cracks while the ground is still moving wastes money, because the cracks reopen.
How long does a subsidence claim or repair take?
Longer than most building work, because diagnosis can include monitoring the cracks over months to confirm whether movement is ongoing before a remedy is chosen. Straightforward cause-removal cases can conclude within a few months; cases involving monitoring, trial pits and underpinning commonly run six months to two years end to end.
Worried about subsidence?
Send us photos of the cracks and we will tell you honestly whether it looks like movement, and what the sensible next step costs.