Multiple reports say around one million homes in London need retrofitting to cope with rising temperatures. The coverage links the issue to higher summer heat and the “urban heat island” effect, where built-up areas can run hotter than surrounding regions because of factors such as buildings, road surfaces, and reduced airflow. The sources describe retrofitting as upgrades to improve how homes handle heat, potentially including measures that make buildings cooler and more energy efficient during hot weather. The reports also frame the challenge as urgent because heat stress can affect indoor comfort, health, and energy demand. While the articles differ little in their core message, they converge on the same scale—about one million homes—and the same main driver: increasing temperatures in London amplified by local environmental conditions. The overall picture presented is that residential buildings that are not well adapted for extreme heat are more vulnerable, and retrofitting is presented as a mitigation step to reduce risk as the climate becomes warmer.