Aviva, the UK’s biggest insurer, has experienced elevated subsidence claims following an exceptionally hot summer that affected households throughout the country. The company saw a pronounced increase in claims between July and September, with submissions continuing through October, according to Chief Executive Amanda Blanc. The surge reflects broader industry trends, as multiple insurance providers have reported similar patterns in recent months.
The rise in claims stems from weather-related ground movements. Extremely dry conditions during summer months cause soil beneath homes to contract and shrink, compromising property foundations. Subsequent wet winter periods lead to ground expansion, potentially causing additional structural damage. August this year marked the joint hottest month globally on record, intensifying these effects across British properties.
Other major insurers have similarly documented significant claim increases. Hastings Direct reported receiving record subsidence claims in August, representing a 140% increase compared with the prior year. Axa, another leading UK home insurer, characterized the period as a surge year for subsidence-related damages. The financial impact has been substantial, with average subsidence claim values reaching £20,000 between April and June, exceeding the prior-year figure by more than £2,000. Industry-wide payouts totaled £72 million during that period, up from £60 million the previous year.
The British Geological Survey has indicated that millions of UK properties face subsidence risk due to climate change impacts. Estimates suggest that up to 11% of UK homes—potentially exceeding 4.2 million properties—could face subsidence risk by 2070. Older homes with shallow foundations and properties constructed on clay-rich soil face heightened vulnerability, with London, Essex, Kent, and Oxford areas identified as particularly exposed regions.
Despite the elevated subsidence claims, Aviva reported financial strength, with general insurance premiums rising 19% to £11.8 billion during the third quarter. The company’s leadership attributed the performance to scale and diversification benefits. Blanc recommended that homeowners mitigate subsidence risks through maintenance of drainage systems, pipes, gutters, and careful management of vegetation.
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