LONDON CLIMATE INSIGHTS

London Flood Risk, Subsidence and Air Quality: Property Data Across 180,000 Postcodes

21 March 2026 - LocalRisk

Analysis of Environment Agency, BGS and Defra data across all 33 London boroughs and 180,920 postcodes reveals a city with four distinct and material climate risks. While 18.1% of postcodes fall in high flood zones, the more striking finding is that 71.2% sit on probable shrink-swell clay - the highest subsidence exposure of any major UK city in our analysis.

London has 71% probable subsidence exposure and the worst urban air quality in England. UKCP18 projects 40 hot days above 25°C per year by the 2030s.

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