Windsor and Maidenhead, South Ascot (SL5)
SL5 0AD in South Ascot (SL5) has a Very low flood risk - EA NaFRA2 data records no properties in a flood risk zone in this postcode. Heat risk is Medium, with a median (50th percentile) of 35 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 Medium at PM2.5 7.4 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Fluvial Sands And Gravels geology; shrink-swell risk is classed as improbable (BGS GeoClimate).
Flood risk at SL5 0AD is rated Very Low, based on Environment Agency NaFRA2 modelling.
Environment Agency flood zone data shows very low flood risk for SL5 0AD in South Ascot (SL5). EA NaFRA2 data shows no properties at flood 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. For a specific property, a conveyancing search will confirm the exact flood zone position.
Heat risk at SL5 0AD 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 SL5 0AD is rated Medium, 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 SL5 0AD as Fluvial Sands And Gravels, 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 SL5 0AD 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 Windsor and Maidenhead and is updated as new official datasets are published.
Windsor and Maidenhead has a Thames Valley commuter-belt setting with river floodplains, suburban development and historic towns and experiences cool, wet winters and warm summers, influenced by flat lowland terrain and Thames Basin climate.
Practical check: 35 hot days are projected (UKCP18 50th percentile, 2021-2040 average under RCP8.5) - check which rooms face south or west and whether the property has cross-ventilation or external shading. With PM2.5 above WHO guidelines here, check which bedrooms face busy roads and how fresh air is drawn into living spaces. These are postcode-level indicators - conditions vary between individual properties.