UK’s Biggest Insurers Face Surge in Subsidence Claims Following Record Hot Summer

The UK’s largest insurers are grappling with a significant increase in property damage claims following an exceptionally hot summer that has highlighted the growing impact of the climate crisis. Aviva, one of the biggest insurers in the UK, confirmed on Friday that it has seen a jump in households filing for subsidence repairs, a trend mirrored across the wider insurance industry.

Subsidence occurs when the ground beneath a property shrinks during dry, hot weather, causing foundations to shift. This movement often results in structural issues such as cracked walls, sloping floors, and windows or doors that no longer close properly. The problem is exacerbated when the ground expands again during wetter winter months, leading to further damage. This year, the situation was intensified by record-breaking temperatures, with August marking the joint hottest month ever recorded globally.

Insights into the biggest insurers in the UK

Aviva’s chief executive, Amanda Blanc, noted that the company experienced a peak period for these claims between July and October. While Aviva did not disclose specific figures regarding the volume of the increase, other industry players have reported stark data. Hastings Direct revealed that its subsidence claims in August were 140% higher than the previous year, while Axa described the current period as a “surge year” for such incidents.

Extreme heat is driving a record rise in UK home subsidence claims, threatening millions of properties.

Financial data from the Association of British Insurers highlights the rising cost of these repairs. Between April and June, the average subsidence claim reached £20,000, an increase of more than £2,000 compared to the same period in the prior year. Total industry payouts for domestic subsidence reached £72m, up from £60m during the corresponding quarter last year. Despite these pressures, Aviva reported strong overall financial performance, including a 19% rise in general insurance premiums during the third quarter.

Experts from the British Geological Survey warn that the threat is long-term, estimating that up to 4.2 million homes—or 11% of the UK housing stock—could be at risk by 2070. Older properties with shallow foundations and those situated on clay-rich soil, particularly in London, Kent, Essex, and the Oxford area, are considered the most vulnerable to ground movement.

Why it matters

The surge in claims underscores the tangible economic consequences of climate change on residential property. As extreme weather patterns become more frequent, homeowners face higher repair costs and potential challenges in property maintenance.

For homeowners, managing the risk involves proactive maintenance of plumbing, gutters, and drains to prevent leaks that can destabilize the ground. While this issue currently centers on the UK, the rising frequency of extreme weather events serves as a global reminder of the need for climate-resilient infrastructure and adaptive property management.