Record UK Heatwave Piles Pressure on Insurers Facing Subsidence and Wildfire Claims Surge

Fourth UK Heatwave Hits While Insurers Grapple with Record Claims

A fourth heatwave in 2026 has pushed the UK into uncharted territory — not just for temperature records but for the property insurance market. On Wednesday a government Cobra emergency committee convened under Prime Minister Andy Burnham after the Met Office issued an amber extreme heat warning for Thursday, with temperatures expected to hit 38°C. The number of days reaching 30°C in 2026 has already broken the 1995 record at 35 days, and amber heat health alerts blanket England.

The financial toll is mounting. The Association of British Insurers reports subsidence claims hit £153 million in the first half of 2026, with the average settled claim reaching £17,820 in Q1 — the highest on record, up 9% year-on-year. That follows a record £307 million in subsidence payouts in 2025. Steven Coxon, head of subsidence at Claims Consortium Group, warned in May that ground conditions remained badly damaged from 2025 and are tracking a similar path to that surge year.

Wildfire and drought add two more fronts. The Environment Agency has recorded 110 wildfires on Sites of Special Scientific Interest this year, and a New Forest heathland fire this week illustrated how one blaze can trigger motor, property and business interruption claims. Seven regions — including London, East Anglia, Hampshire and the whole south-west — are already under official drought status, hitting crop yields and grass growth for farm insurers.

Against this backdrop, Deloitte forecasts UK home insurers will swing to a net underwriting loss in 2026 with a combined ratio of 102.1%. The Prudential Regulation Authority launched its General Insurance Stress Test in May precisely to press firms on climate-driven property exposure, signalling that wildfire and heat risk are moving to the centre of regulatory scrutiny.

Subsidence, Wildfire, and Drought: The Accumulating Exposure

Why Subsidence Claims Are Threatening to Surge Again

The conditions are almost identical to the three previous surge years — 2018, 2022 and 2025 — when prolonged dry weather caused clay-rich soils across central and southern England to shrink, cracking foundations and walls. Soil moisture deficits were already elevated before this week's heat, and a fourth heatwave arriving in August compounds the damage. The record H1 claim total and the highest average settlement ever recorded suggest that even without further extremes, 2026 is on track to match or exceed 2025's subsidence payout. For insurers, that means reserving must assume a continuing climb in both frequency and severity.

Wildfire Coverage: The Gap Most Clients Miss

Many standard UK property policies were not drafted with wildfire as a named peril, leaving a gap between what clients assume is covered and what their wording actually provides. The 110 wildfires recorded on protected sites in 2026, plus incidents such as the New Forest heathland fire, show how quickly a single event can generate simultaneous motor, property and business interruption claims. Brokers who review wordings now can identify coverage holes before a fire — not after — and discuss excess structures that may surprise clients expecting full indemnity.

Drought Adds a Farm Insurance Dimension

With half of England officially in drought, reduced grass growth and lower crop yields are already a feature of the season. The National Farmers' Union is warning members to prepare for prolonged dry conditions. Farm insurers are seeing rising claims on multi-peril crop policies and livestock impacts, and this is happening at a time when property insurance overall is under strain. Rural brokers who understand the compound exposure of drought-plus-subsidence-plus-wildfire can differentiate their advisory value.

The Financial Squeeze on Home Insurers

Deloitte's forecast of a 102.1% combined ratio in 2026 means for every £1 in premium home insurers collect, they expect to pay out £1.02 in claims and expenses. With total property payouts already hitting a record £6.1 billion in 2025 and weather-related claims up 14%, the margin for error is slender. Insurers facing such pressure are more likely to tighten underwriting terms, scrutinise high-risk postcodes, and push up excesses at renewal.

Regulatory Pressure Moves to the Forefront

The PRA's 2026 stress test explicitly targets climate-driven property risk, a signal that wildfire and heat-related loss are no longer niche considerations but core to balance-sheet resilience. The outcome could lead to higher capital requirements for insurers with concentrated exposure in the very areas now suffering drought and subsidence — London, the south-east, and the Midlands. For brokers, the test also creates a talking point with clients about the security of their insurer.

Broker Imperatives as the Market Tightens

• Review property wordings for clients in clay-soil regions and near heathland: confirm whether wildfire is a named peril, and flag any exclusions. The average subsidence claim now exceeds £17,820 — excess structures should be manageable for the policyholder.
• For agricultural and rural clients, assess multi-peril crop policies and check whether drought-induced loss is fully covered. The Environment Agency drought status already covers over half of England.
• Revisit motor policies for clients operating near heathland or in wildfire-risk areas; a vehicle loss from a fast-moving fire may not be covered under standard third-party extensions.
• Prepare clients for tighter renewal terms: with the combined ratio forecast at 102.1%, insurers are set to harden pricing and restrict coverage in high-risk postcodes. Start conversations about risk mitigation.
• Watch for the PRA stress test results; any indication of increased capital charges for climate-exposed books will flow through to underwriting appetite, creating a chance for brokers who can place business with carriers better positioned for these risks.