Overview
- The Met Office issued a red heatwave warning on Monday as temperatures may reach 40C, raising short-term risk that dry conditions will trigger ground subsidence in vulnerable areas.
- A Uswitch map using British Geological Survey data highlights a continuous high-risk band from Dorset through London and the East up to North Yorkshire, with London Clay singled out as the most susceptible soil.
- Industry figures show subsidence already cost insurers heavily: the Association of British Insurers reported a record £307 million paid on subsidence claims in 2025 with an average payout near £17,000.
- Homeowners face high upfront costs because subsidence excesses typically range from £1,000 to £2,500, so experts advise photographing and monitoring cracks and getting a chartered surveyor’s diagnosis before contacting insurers to avoid a CUE entry.
- Beyond immediate repairs, rising payouts could push up premiums and make it harder to insure properties in ‘Moderate’ or ‘Significant’ zones, so owners should check their cover now and consider professional surveys if they live in the mapped band.