Suburban Area CLIMATE RISK

West Barnes Flood Risk Data

West Barnes is a suburb in Greater London, within Merton council area. This page shows flood, heat, air quality, and subsidence risk data for West Barnes, drawn from official UK government sources. LocalRisk tracks 12 postcodes within West Barnes.

West Barnes has significant flood exposure based on Environment Agency NaFRA2 data. 20.2% of postcodes in West Barnes fall into high or higher flood risk bands, with a further 13.5% at medium risk and 66.3% at lower risk. Flood risk at street level can differ significantly from these area-wide averages — elevation, proximity to watercourses, and local drainage all affect individual postcode risk bands. Check a specific postcode above for your exact Environment Agency flood risk rating.

Heat risk in West Barnes is moderate under current projections. Met Office UKCP18 data suggests around 39 days above 25°C per year in this area by the 2021-2040 period (central estimate, high emissions scenario). These are probabilistic projections — actual outcomes depend on future emissions levels. Properties in West Barnes without adequate ventilation or insulation may face increasing summer heat stress and higher cooling costs as temperatures rise.

Air quality in West Barnes averages 8.6 µg/m³ PM2.5, which is elevated — above the WHO annual mean guideline of 5 µg/m³. Defra UK-AIR monitoring data underpins this figure. PM2.5 levels are typically higher near busy roads, industrial areas, and dense urban centres, and lower in parks, green corridors, and residential backstreets.

Subsidence data for West Barnes is sourced from the British Geological Survey GeoSure dataset, which maps clay shrink-swell risk across Great Britain. In areas with shrink-swell clay, foundations can shift as soils dry out in summer and re-wet in winter. Properties built before 1980 on clay-rich ground are most exposed. Check a specific postcode for West Barnes for a property-level subsidence risk band.

Anyone buying, renting, or advising on property in West Barnes can use LocalRisk to run a free flood risk check on any UK postcode. Each report covers flood risk (Environment Agency), heat projections (Met Office), air quality (Defra), subsidence (BGS), and coastal erosion where applicable — the same underlying datasets used by insurers, conveyancers, and local planning authorities. Use the postcode links above to check a specific address in West Barnes.