Senior insurers warn climate-driven coverage withdrawal could trigger a crisis with echoes of 2008
A group of senior UK and European insurance and reinsurance professionals have issued a stark warning. As climate risk accelerates, the industry's strategy of repricing, restricting and withdrawing property cover could undermine the mortgage market in a way that echoes the subprime collapse that triggered the Global Financial Crisis.
The warning comes from Inside Track x (Re)Insurance, a collective of senior non-life insurance, reinsurance and broking executives, in a memo published on Wednesday. The group – whose members hold or have recently held senior roles across the industry – is candid about where their sector is headed, and what it means for anyone with a mortgage.
"Insurance is necessary to access a mortgage, allowing providers to manage their own financial exposure," the memo states. "As both domestic and commercial property insurance is limited or withdrawn at a significant scale, we foresee an economic risk that could precede a financial crash in the way that the sub-prime mortgage crisis catalysed the Global Financial Crisis."
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The mechanics of withdrawal
The insurance industry's response to mounting climate risk is playing out in three stages, according to the group. First, premiums are repriced upwards to reflect elevated physical risk, making cover unaffordable for many households. Second, coverage is restricted to exclude elevated hazards such as flooding and wildfire, renegotiated each year on 12-month terms with little friction. Third, where premiums and claims cannot be balanced, insurers simply withdraw from certain geographies and sectors entirely.
The third stage is the most significant one mortgage brokers need to watch. A property without buildings insurance cannot secure a mortgage. If withdrawal accelerates across coastal, flood-prone and subsidence-affected communities, the pool of mortgageable properties shrinks – and with it, the market brokers operate in.
The data already points in this direction. A Winter 2026 study by PriceHubble and MIAC Analytics found that Bank Underground modelling suggests the share of UK mortgagors without insurance could rise from around 5% today to between 7% and 10% by 2050. The same research stress-tested a £330 million lifetime mortgage portfolio and found that under a no-additional-action climate scenario, property-level risk data produced losses nearly seven times higher than the base case.
A UKSIF and Public First report warned that flood risks could turn 430,000 households in England into "climate mortgage prisoners" by 2050, left with higher mortgage costs and mounting repair bills for homes they would struggle to sell. In the worst case, market shocks from rising flood events could "cascade through the wider financial system" and pose a risk to the country's "overall financial stability".
What regulators are watching
The Financial Conduct Authority (FCA) is already paying attention. On 4 August, the FCA published a new web page for regulated firms on how physical climate risks – such as flooding – may impact the property insurance and mortgage markets. The regulator's engagement with mortgage lenders identified a consistent theme: firms are considering how changes in the availability and affordability of property insurance could affect future mortgage lending, including Flood Re's scheduled expiry in 2039 and the growing number of properties that do not qualify for the scheme.
The Inside Track memo argues that regulatory pressure alone will not be sufficient if the insurance industry continues to be driven by short-term commercial incentives. The group warns that natural catastrophe modellers and actuaries inside some firms are being pressured to reduce their projections – to "manage down the numbers" – in order to protect profitability and deal flow. That, they say, means the full scale of risk is not reaching the boardroom, the regulator, or the government.
The systemic question for brokers
This is not an abstract risk. Columbia Threadneedle Investments found that preparedness among UK mortgage lenders is uneven, and that the assumption property insurance is affordable today cannot be extrapolated into the future, putting more onus on banks and consumers to understand the long-term risk profiles of assets.
Brokers placing clients in high-risk postcodes need to understand what happens to those clients if their insurer reprices or withdraws at renewal. A borrower who can no longer obtain affordable buildings insurance – a condition of virtually every residential mortgage – faces a choice between accepting a more expensive default standard variable rate (SVR) mortgage or being left unable to remortgage at all.
The Inside Track group stops short of prescribing solutions. What it does insist on is that the problem is not coming, it is already here. The UK mortgage market's exposure to climate risk is building quietly, one policy renewal at a time. Brokers who understand the insurance market's direction of travel will be better placed to advise clients on where and what to buy, and what questions to ask long before a completion date.
The FCA's Consumer Duty already requires firms to monitor and act on emerging risks to customer outcomes. Climate-driven insurability is, increasingly, one of those risks.
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