CH4 0AP - Flood, Heat, Air & Subsidence Risk - Bretton

Flintshire, Bretton

Climate risk summary for CH4 0AP

Heat risk is Lower, with a median (50th percentile) of 13 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 5.5 μg/m³, above the WHO annual guideline of 5 μg/m³ (Defra UK-AIR). Ground conditions are Low risk, with Quaternary Marine/Estuarine Sand And Silt geology; shrink-swell risk is classed as improbable (BGS GeoSure).

• Heat: Projected 13 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5, 12 km grid - postcodes within the same grid cell share this value).
• Air quality: PM2.5 5.5 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR PCM model, council-level average - every postcode in this council shows this value).
• Ground: BGS data: Quaternary Marine/Estuarine Sand And Silt geology. Shrink-swell risk classed as improbable (British Geological Survey).

How is the air quality in CH4 0AP?

Air quality at CH4 0AP 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.

Is subsidence a risk at CH4 0AP?

BGS GeoSure data classes the underlying soil at CH4 0AP as Quaternary Marine/Estuarine Sand And Silt, 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.

Where does this data come from?

This LocalRisk report for CH4 0AP draws on four official UK open data sources: Natural Resources Wales flood mapping, 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 Flintshire and is updated as new official datasets are published.

About the Flintshire area

Flintshire has a mixed coastal, industrial and rural setting along the Dee estuary and inland valleys and experiences cool, wet winters and mild summers, influenced by estuarine conditions and rising ground.

Climate risk can change street by street, so it is worth checking neighbouring postcodes too. The full risk report for CH4 0AA is at localrisk.co.uk/postcode/CH40AA, and you can compare CH4 0AP side by side with any UK postcode at localrisk.co.uk/compare.