Subsidence Payouts Hit Record £20,000 in UK Heatwave

What the Claims Data Shows

Figures published by the Association of British Insurers in its Property Insurance Tracker show home insurers paid 72 million pounds for domestic subsidence claims in the second quarter of 2026, with the average claim reaching a record 20,000 pounds. That average sits more than 2,000 pounds above the equivalent quarter of 2025. Across the first half of 2026, subsidence claims totalled 153 million pounds and supported almost 9,000 households, at an average payout of 17,263 pounds for settled claims in that period. The gap between the half year average and the second quarter figure reflects the way claims settle: subsidence claims are opened during a dry period but settle months later, so the cost recorded in any quarter is a partial view of an event that is still developing.

The trend is not confined to subsidence. Between April and June 2026 the average payout across all types of home insurance claim passed 7,000 pounds for the first time, having only crossed the 6,000 pound mark in the same period a year earlier. The average claim for damage to homes and possessions from flooding, storms and burst pipes reached 8,548 pounds in the quarter, up 12 per cent year on year, and the average theft claim reached a record 5,100 pounds, up 27 per cent. Across 2025 as a whole insurers paid almost 3.4 billion pounds across more than 560,000 home insurance claims, with subsidence payouts reaching a record 307 million pounds, an increase of 10 per cent or 27 million pounds on the previous year.

Why Heat and Drought Move the Numbers

Subsidence occurs when the ground beneath a property sinks and the foundations move with it. The most common cause in the United Kingdom is clay soil losing moisture and shrinking during prolonged dry weather, which is why the peril is concentrated in London, the south east and the clay belts of the Midlands and East Anglia rather than distributed evenly across the country. Trees and large shrubs compound the effect by drawing water from the ground within their root spread, which is roughly equivalent to their mature height. Damage appears as diagonal cracking wider at the top than the bottom, typically near door and window openings, along with sticking doors and windows and separation between an extension and the main structure.

The current conditions map directly onto that mechanism. The Met Office issued an amber extreme heat warning covering eastern and central England for 13 August 2026, with temperatures forecast widely into the mid thirties Celsius and highs around 37 Celsius in London and Birmingham, following heat health alerts issued by the UK Health Security Agency across most of England. This is the fifth heatwave of the summer, arriving after what the Met Office recorded as the driest July in England and Wales since records began in 1836 and against a background of drought declared across a large share of England. Loss adjusters have flagged that ground conditions entering 2026 were already damaged by the severe weather of 2025, meaning the current dry spell is compounding an existing deficit rather than starting from a neutral baseline.

Where the Exposure Sits

Subsidence risk is geological before it is meteorological, which is why claim volumes cluster rather than spread. The shrink swell clays of the London Basin, the Thames Valley, Essex, Kent, Hertfordshire and parts of the Midlands and East Anglia carry the highest exposure, and the British Geological Survey has projected that the frequency and geographic spread of subsidence may grow in coming decades, potentially extending beyond the traditional London and south east concentration. Property age matters alongside soil type: Victorian and Edwardian housing was typically built on shallow foundations of around half a metre, against the one metre or deeper foundations required under modern building regulations, and shallow foundations sit within the zone where clay moisture actually changes with the seasons.

The other variable is vegetation. Mature trees within influencing distance of a building, broadly a distance equal to the tree's mature height, extract substantial volumes of water from clay soils during a dry summer. Species with high water demand, including oak, willow, poplar and elm, appear disproportionately in claim files. The counterintuitive point for homeowners is that removing a mature tree near a property that has already suffered clay shrinkage can trigger heave, in which the rehydrating ground swells and lifts the foundations, causing damage that is frequently more expensive to repair than the original subsidence. Removal decisions belong with the insurer's appointed engineer and the local authority, since many mature trees are protected by preservation orders or sit within conservation areas.

What Buildings Insurance Covers

Subsidence is a standard peril on buildings insurance policies in the United Kingdom, covering the cost of repairing damage to the structure and, where necessary, stabilising the foundations. It is not covered by contents insurance, and leaseholders in a block generally rely on the freeholder's buildings policy rather than their own. Two features distinguish subsidence from other perils on the same policy. The first is the excess, which is commonly set at 1,000 pounds for subsidence against a typical few hundred pounds for other claims, and which is applied per claim. The second is the exclusion of damage to paths, drives, patios, boundary walls, gates and outbuildings unless the main building is damaged at the same time, which is why a cracked driveway alone rarely produces a payout.

Policies also exclude damage caused by faulty design, defective workmanship or the settlement of newly made ground, and they exclude the pre-existing damage that a policyholder knew about when the policy was taken out. Insurers distinguish subsidence from heave, where the ground swells rather than sinks, often after tree removal, and from landslip. All three are usually listed together as covered perils but they have different causes and different remedies. Policyholders who have made a subsidence claim are required to disclose it at renewal and when moving insurer, and while a history of subsidence narrows the market it does not remove it, because insurers offering cover on previously underpinned properties operate in the specialist end of the market rather than through price comparison sites.

Making a Claim and the Underinsurance Trap

A subsidence claim runs long. The insurer typically appoints a loss adjuster and then a structural engineer, and the property is monitored for a period covering at least one full seasonal cycle, commonly 12 months, to establish whether the movement is progressive or has stabilised. Only after monitoring does the insurer determine the remedy, which in the majority of cases is vegetation management and repair rather than underpinning. Claims taking a year or more to resolve are normal rather than a sign of poor handling, though the Financial Ombudsman Service can consider complaints about delay, about the choice of remedy and about the standard of repair once the insurer's own complaints process has been exhausted or eight weeks have passed.

The second exposure sits at renewal rather than at claim. Buildings insurance is written against the cost of rebuilding the property, not its market value, and the ABI and BCIS House Rebuilding Cost Index rose 3.9 per cent in the year to July 2026. A sum insured that has not been reviewed for several years is likely to sit below the current rebuild cost, and where a property is underinsured an insurer may reduce a claim payment proportionately to the shortfall under the terms of the Insurance Act 2015. On a claim averaging 20,000 pounds, a 20 per cent shortfall in the sum insured is a material sum. Reviewing the rebuild figure, and declaring any trees within influencing distance of the property, are the two renewal checks that carry the most weight in a drought year.

Frequently asked questions

How much is the average subsidence claim?

The average domestic subsidence claim reached a record 20,000 pounds in the second quarter of 2026 according to the Association of British Insurers, more than 2,000 pounds higher than the same quarter of 2025. Across the first half of 2026 the average settled payout was 17,263 pounds.

Is subsidence covered by home insurance?

Subsidence is a standard peril on buildings insurance policies, covering repair to the structure and foundation stabilisation where required. It usually carries a higher excess than other perils, commonly 1,000 pounds, and damage to paths, drives and boundary walls is generally excluded unless the main building is damaged at the same time.

What are the signs of subsidence?

Diagonal cracks that are wider at the top than the bottom, usually near doors and windows and wider than around 3 millimetres, doors and windows that stick without an obvious cause, and gaps opening between an extension and the main structure. Cracking that appears suddenly during a dry spell is more indicative than long standing hairline cracking.

How long does a subsidence claim take?

Monitoring usually runs for at least one full seasonal cycle, commonly 12 months, before the insurer decides on a remedy. Claims taking a year or longer to settle are common. Complaints about handling can be taken to the Financial Ombudsman Service after the insurer's own process is exhausted or eight weeks have passed.

Does a subsidence claim make a house harder to insure?

A subsidence history must be disclosed at renewal and when changing insurer, and it narrows the number of insurers willing to quote. Cover remains available, generally through specialist insurers and brokers rather than price comparison sites, and existing insurers are required to continue offering terms in many cases.