Astounding new analysis has revealed that over 100,000 UK homes are at high risk of overheating due to the soaring trend of converting commercial properties into residential spaces. The alarming figure comes as government data shows a 58% surge in applications for such conversions between 2022 and 2025, with 1,623 submitted last year alone. Zurich UK's examination of planning records warns that many of these converted buildings were not designed to handle the demands of prolonged residential use, leaving them woefully unprepared for increasingly frequent heatwaves.
The insurer highlights the critical differences between commercial and residential properties, pointing out that offices are typically built with different operating tolerances than homes. Factors such as inadequate ventilation, extensive glazing, and outdated materials can all contribute to overheating risks in converted spaces. Moreover, many of these buildings may fall short of modern overheating standards, casting doubt on their long-term suitability in a changing climate.
According to Megan Dunford, Zurich's head of large and complex property claims, the risks associated with overheating extend far beyond temporary heatwaves. 'As we experience more prolonged and sustained heat events,' she says, 'building fabrics will come under increasing stress, potentially leading to costly damage and maintenance issues for residents.' London is particularly vulnerable, with many existing homes and converted buildings ill-equipped to handle extended periods of high temperatures.
Research by academics at the Grantham Research Institute on Climate Change and the Environment paints a stark picture: approximately half of all UK homes are already at risk of overheating. The study warns that this figure could rise dramatically to 90% if global temperatures reach 2°C, underlining the urgent need for action. While new-build properties must adhere to strict building regulations addressing overheating, many older homes remain exempt from these standards – a significant portion of which are among the least energy-efficient in Europe.
As the Climate Change Committee warns that heat-related deaths in the UK could increase by around 250% by the 2050s if adaptation measures are not implemented, Zurich UK is urging developers and policymakers to integrate climate resilience into their plans. This includes improving ventilation, reducing solar heat gain, upgrading building fabrics, and conducting thorough overheating risk assessments – all essential steps towards safeguarding the nation's homes from the perils of overheating.