As UK heatwaves become the new normal, half of homes are already at risk of overheating—with that number soaring to 92% by 2050 if we don’t act. Enter Marion Baeli, an architect in south London who transformed her 1960s house into a cool, energy-efficient haven using Passivhaus principles. With super-insulation, triple-glazed windows, and airtight construction, she slashed energy bills by 88% and saved nearly £750 a year—despite a £80,000 retrofit cost. While retrofitting is pricey, new builds can adopt Passivhaus with minimal extra cost, and regulations in England and Scotland are pushing toward these standards. Even without full upgrades, simple shading tactics like curtains and external blinds can dramatically cool your home during scorching summers.

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