Britain is experiencing increasingly frequent heatwaves, and new analysis suggests this trend is set to intensify as global temperatures continue to rise. Currently, only about 13 percent of the country endures five or more days above 30 degrees Celsius annually. However, projections based on data from the Met Office indicate that if global temperatures increase by 1.5 degrees Celsius, this figure will double to 26 percent. A rise of 2 degrees could see 44 percent of Britain experiencing five or more hot days per year.
The research, conducted by Savills Earth—the climate advisory division of the estate agency Savills—highlights a clear pattern: urban areas and southern regions face the greatest temperature increases. Cities tend to be on average 2 degrees hotter than their rural surroundings. London, in particular, is forecast to see the average number of days above 30 degrees Celsius rise from five to nearly ten annually. Elsewhere in the east and southeast, hot days are expected to double from approximately three to six.
These higher temperatures also correlate with Britain's most expensive property markets. Areas recording six to seven hot days a year have average house prices exceeding £645,000, while regions with no days above 30 degrees average £226,000. This disparity underscores a potential shift in residential preferences and property investments.
Savills anticipates two possible responses to rising heat. One involves a surge in cooling home improvements, while the other is a seasonal migration to cooler locations where second homes or temporary residences may become more desirable. Drawing comparisons to patterns seen in cities like Madrid and Milan, where residents retreat to cooler regions during summer months, some experts suggest a similar trend could emerge in Britain.
The analysis identifies regions with few or no projected hot days that already feature above-average house prices and low flood risk under a 1.5-degree warming scenario. Coastal towns such as Budleigh Salterton in East Devon, Penrhyn Bay in Conwy, Whitley Bay in North Tyneside, and Gullane in East Lothian stand out as potential "cool bolt holes." Likewise, locations in hilly areas like Ambleside in Westmorland and Furness, Settle in North Yorkshire, Glossop in Derbyshire, and Church Stretton in South Shropshire also offer comparatively cooler environments with limited hot days annually.
The growing concern over overheating is influencing homebuying behaviors, with certain architectural features now viewed as drawbacks. South- or west-facing windows, glass conservatories, large floor-to-ceiling windows, and skylights, especially in upper floors or flats with limited ventilation, are increasingly seen as problematic. Exposure to intense afternoon sun can significantly raise indoor temperatures, complicating efforts to cool homes. Limited window openings, commonly found in tower blocks, restrict airflow and contribute to heat buildup.
In response, homeowners are adopting a range of cooling strategies. These range from external solutions like shutters and reflective window films to internal applications such as blackout curtains and fans, as well as encouraging natural ventilation. Experts caution that while air conditioning provides relief, it is energy-intensive and can exacerbate urban heat by expelling warm air into the environment.
At the regulatory level, building standards are evolving to better address overheating risks. New constructions increasingly comply with guidelines under Part O of building regulations, designed to mitigate heat retention. Sustainability certifications like BREEAM also emphasize climate resilience in building design. Urban planners are incorporating heat action plans and creating designated cool spaces, including shaded gardens and air-conditioned communal areas, to enhance livability as temperatures rise.
As Britain’s climate continues to warm, the combined influence of changing weather patterns, housing market dynamics, and urban design will shape how residents manage and adapt to hotter summers. For some, relocation to cooler "bolt hole" locations may become a preferred solution, underscoring the evolving relationship between climate and habitation across the country.