Wiltshire, Calne (SN11)
SN11 0AR in Calne (SN11) has a High flood risk - EA NaFRA2 data records 1 property at high flood risk. Heat risk is Medium, with a median (50th percentile) of 27 days above 25°C per year, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario (Met Office UKCP18). Air quality is Low at PM2.5 6.0 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Limestone geology; shrink-swell risk is classed as improbable (BGS GeoClimate).
Flood risk at SN11 0AR is rated High, based on Environment Agency NaFRA2 modelling.
Environment Agency flood zone data places SN11 0AR in the high flood risk band. EA NaFRA2 data shows 1 at high risk in this postcode. The band reflects the highest flood risk within the postcode; some properties within this postcode may face little or no direct flood risk. A formal flood risk search and review of buildings insurance availability is recommended before any property transaction in this area.
Heat risk at SN11 0AR is rated Medium, reflecting Met Office UKCP18 climate projections (50th percentile) for this area, averaged over the 2021-2040 period under the RCP8.5 high emissions scenario. These are probabilistic projections - the 50th percentile is the central estimate within RCP8.5; the full range of modelled outcomes is wide and lower emissions scenarios would produce lower figures. Higher summer temperatures increase cooling energy costs, affect comfort in poorly insulated or south-facing properties, and can accelerate shrinkage in clay soils beneath foundations. Properties built before 1980 without cavity wall insulation are typically most affected.
Air quality at SN11 0AR is rated Low, based on Defra UK-AIR annual mean PM2.5 data. Fine particulate matter (PM2.5) comes primarily from road traffic, industry, and domestic burning. Long-term exposure above the WHO guideline of 5 µg/m³ is linked to respiratory and cardiovascular health risks. Buyers and renters in higher air quality risk areas may wish to consider whether the property is near busy roads or industrial sources.
British Geological Survey data classes the underlying soil at SN11 0AR as Limestone, with shrink-swell hazard rated improbable (subsidence risk band: Low). A structural survey is the reliable way to assess ground conditions for a specific property.
This LocalRisk report for SN11 0AR draws on four official UK open data sources: Environment Agency NaFRA2 flood modelling, Met Office UKCP18 climate projections, Defra UK-AIR PM2.5 monitoring, and British Geological Survey GeoClimate subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Wiltshire and is updated as new official datasets are published.
Wiltshire has a largely rural setting with chalk downland, river valleys, market towns and military land and experiences cool, wet winters and warm summers, influenced by elevation and free-draining geology.
Practical check: With 1 property at high flood risk here, ask about past flooding events, check the entrance threshold height relative to road level, and review buildings insurance terms. With 27 hot days projected (UKCP18 50th percentile, 2021-2040 average under RCP8.5), note which bedrooms face west (hottest in evening) and whether windows allow through-ventilation. These are postcode-level indicators - conditions vary between individual properties.
Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for SN11 0AA is at localrisk.co.uk/postcode/SN110AA, and you can compare SN11 0AR side by side with any UK postcode at localrisk.co.uk/compare.