A staggering 430,000 households across England risk becoming “climate mortgage prisoners” by 2050, trapped in flood-prone properties they cannot sell easily or refinance affordably, according to a new report by Public First titled Flooding the Market: The Climate Mortgage Trap.
The report, commissioned by the UK Sustainable Investment and Finance Association (UKSIF), highlights that homes vulnerable to flooding, particularly in low-lying areas like Boston and Skegness, could lose over 20% of their value. These regions are predicted to become hotspots for “climate mortgage prisoners” where homeowners struggle with high-interest mortgages on properties that the market increasingly rejects.
This scenario threatens to inflict severe damage not just on household finances but also on the broader housing market, potentially triggering a localized credit crunch. Mortgage lending depends heavily on insurance to protect property values and signal risks. However, climate change is disrupting this balance as insurers face mounting flood-related claims and respond by raising premiums or refusing coverage in high-risk areas.
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Amy Norman, Director at Public First, emphasizes the urgency: “For most British families, their home represents their largest asset. But rising flood risks, like those witnessed this winter, are eroding that security. Without prompt government intervention, up to half a million households could be stuck in unsellable, poorly insured homes by mid-century, jeopardizing market stability.”
James Alexander, CEO of UKSIF, underscores the broader economic threat: “Flooding induced by climate change imperils hundreds of thousands of homes and could shock the housing market with ripple effects throughout the economy. Policymakers must act now by supporting mortgage products that finance resilience upgrades and mandating Flood Performance Certificates to better inform buyers.”
Jason Storah, CEO UK & Ireland General Insurance at Aviva, adds: “The increase in flood risk is undeniable. Our recent study found one in nine new homes built between 2022 and 2024 sit in medium or high flood-risk zones. It is vital that government strengthens planning and building regulations to prevent placing more homes and communities in harm’s way.”
The report is a stark warning that time is running out to protect the nation’s most valuable asset class and avoid a looming crisis at the intersection of climate change, housing, and finance.