Does Subsidence Affect Your Home Insurance? UK Buyer Guide

A RICS survey that mentions possible subsidence sends most buyers straight to a cost question — but the insurance question usually matters more, and it gets asked far less often. A house that's perfectly liveable and affordable to repair can still be a real headache to insure, and that's worth knowing before you exchange, not after. If you're still deciding whether to buy at all, start with my wider guide to buying a house with past subsidence — this one sticks to the insurance side.

A crack on its own is not a subsidence claim. Where movement really is subsidence, price the next steps before anyone prices underpinning: monitoring at about £300–£800, then an independent structural engineer at about £500–£1,500. Those are a builder's figures for the follow-on work, not an insurer's and not an underpinning contractor's.

The Question That Actually Matters: Confirmed or Just Suspected?

There's a big difference between a surveyor noting cracking that could indicate subsidence and a property with a formal subsidence claim on record. Ordinary cosmetic cracking doesn't affect insurance at all — see our guide on subsidence, settlement or thermal movement for how to tell them apart. The insurance question only really bites once there's been an actual diagnosis and claim.

If There's a Past Subsidence Claim on Record

Insurers ask about a property's subsidence history, not just what's happened during the current owner's tenure. A previous claim — even one resolved decades ago with underpinning that's held up perfectly ever since — typically has to be declared on every future application, indefinitely. It doesn't expire.

Standard high-street insurers often decline outright or load the premium heavily once that history is disclosed. Specialist insurers exist specifically for previously-underpinned or subsidence-affected properties, usually at a higher premium and with a specific, higher excess for any future subsidence claim — commonly around £1,000 rather than the standard few hundred pounds.

Check Before You Exchange, Not After

Get an actual insurance quote for the specific property before you commit, not a generic estimate based on the postcode. Some buyers only discover a property is effectively uninsurable at a normal premium after they've already exchanged, when it's far too late to renegotiate or walk away. A broker who specifically deals with subsidence-affected properties can usually find cover where a mainstream insurer won't even quote.

How Long Do You Have to Declare Subsidence?

There is no fixed cut-off in law. It depends on the question the insurer asks. Most application forms ask whether the property has ever suffered subsidence, heave or landslip, or ever been underpinned, and if that's the question, the answer stays yes for as long as the house stands. Some insurers ask about the last 10 or 25 years instead.

The rule that matters is simple: answer the question on the form honestly and carefully. Under the Consumer Insurance (Disclosure and Representations) Act 2012 you have to take reasonable care not to give a misleading answer, and an insurer that finds out later can reduce or refuse a claim. If you're buying, ask the seller's conveyancer directly about any past claim, so you know what to declare.

Does Buildings Insurance Cover Cracked Walls?

Sometimes. Buildings insurance normally covers damage caused by subsidence, heave or landslip, usually with a subsidence excess of around £1,000. It normally doesn't cover:

• ordinary settlement, shrinkage or thermal movement in the walls
• new structures settling in their first months
• wear and tear, or poor workmanship
• damage that started before your policy began

That last point matters to buyers. If the cracking was already there when you bought, a new insurer may treat it as pre-existing. Ask the seller whether there has ever been a claim, whether one is open now, and whether their insurer would continue cover for a new owner. Some will, particularly on a house that has already been underpinned.

Insurance for a Property With Subsidence History: What to Ask Before Exchange

• The claim file: date, cause, the engineer's report and what repairs were done
• Certificate of structural adequacy or engineer's sign-off, and any guarantee on the underpinning
• Monitoring results if movement was monitored after the repair
• A real quote for this address, declaring the history, from a mainstream insurer and a specialist broker
• Whether the seller's insurer will continue cover, sometimes the cheapest route on a previously underpinned house

If any of that is missing, your conveyancer can raise it as an enquiry. The buying a house with past subsidence checklist goes through the rest.

Underpinning Doesn't Automatically Fix the Insurance Problem

Completed underpinning with proper engineer sign-off and a guarantee usually does make a property insurable again — but expect a subsidence-specific excess and possibly a loaded premium, at least for a period. Read our guide on when underpinning is actually necessary if a RICS survey has recommended it, since it's also one of the most over-recommended repairs in the industry.

What About a Crack That's Just Cosmetic?

The presence of any crack at all doesn't create an insurance issue. Ordinary hairline or cosmetic cracking — Category 0 or 1 on the standard scale — isn't subsidence and doesn't need to be declared as anything. The problem is specifically a formal subsidence diagnosis and claim history, not the existence of a crack on the wall. Our crack severity checker is a reasonable first step in working out which category you're actually looking at.

Already Have the RICS Survey in Hand?

If the report mentions possible subsidence or cracking, get the findings priced before you exchange — start with the crack severity checker, then get your RICS survey priced if you want a builder to cost the whole schedule.

Related: Buying a house with past subsidence · Should I pull out after a bad survey? · Mortgage retention on a valuation