BS31 1AP - Flood, Heat, Air & Subsidence Risk - Somerdale

Bath and North East Somerset, Somerdale

BS31 1AP in Somerdale has a Medium flood risk - EA NaFRA2 data records 2 properties in a flood risk zone. Heat risk is Lower, with a median (50th percentile) of 23 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 6.1 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Calcareous Rocks And Mudstone geology; shrink-swell risk is classed as improbable (BGS GeoSure).

• Flood: EA NaFRA2: 1 medium, 1 low flood risk properties in this postcode.
• Heat: Projected 23 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5).
• Air quality: PM2.5 6.1 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR).
• Ground: BGS data: Calcareous Rocks And Mudstone geology. Shrink-swell risk classed as improbable (British Geological Survey).
• Green space: less than 1% of addresses within 200m of green space - below the England median (ONS).

Flood risk at BS31 1AP is rated Medium, based on Environment Agency NaFRA2 modelling.

Air quality at BS31 1AP 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.

BGS GeoSure data classes the underlying soil at BS31 1AP as Calcareous Rocks And Mudstone, with shrink-swell hazard rated improbable (subsidence risk band: Low). Soil type and shrink-swell behaviour drive subsidence claims following dry summers; recent ABI data shows insurer payouts rose sharply after the 2022 and 2025 hot summers. A structural survey is the reliable way to assess ground risk for a specific property.

This LocalRisk report for BS31 1AP 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 GeoSure subsidence mapping. Risk ratings are a screening tool, complementing - not replacing - the searches and surveys ordered as part of a property transaction. Data covers Bath and North East Somerset and is updated as new official datasets are published.

Bath and North East Somerset combines a historic urban centre with surrounding hills and valleys and experiences cool, wet winters and warm summers, influenced by topography and river corridors.

Environment Agency flood zone data places BS31 1AP in the medium flood risk band. EA NaFRA2 data shows 1 at medium risk, 1 at low 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. Individual properties within BS31 1AP can differ - a formal flood risk search is recommended before any property transaction.

Practical check: EA data flags 2 properties at flood risk here - check whether the property is among them by comparing its position to the flood zone boundary. With 23 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.