LL20 7AF - Flood, Heat, Air & Subsidence Risk - Chirk

Wrexham, Chirk

LL20 7AF in Chirk has a High flood risk. Heat risk is Lower, with a median (50th percentile) of 16 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 Mudstone And Sandstone geology; shrink-swell risk is classed as improbable (BGS GeoSure).

• Flood: Plan with flood risk in mind for this area.
• Heat: Projected 16 days above 25°C per year, 2021-2040 average (Met Office UKCP18, 50th percentile under RCP8.5).
• Air quality: PM2.5 5.5 µg/m³ - above the WHO annual guideline of 5 µg/m³ (Defra UK-AIR).
• Ground: BGS data: Mudstone And Sandstone geology. Shrink-swell risk classed as improbable (British Geological Survey).

Flood risk at LL20 7AF is rated High, based on Natural Resources Wales flood mapping.

Air quality at LL20 7AF 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.

BGS GeoSure data classes the underlying soil at LL20 7AF as Mudstone And Sandstone, 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 LL20 7AF 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 Wrexham and is updated as new official datasets are published.

Wrexham has an inland town and rural hinterland setting with former industrial land, river valleys and surrounding uplands and experiences cool, wet winters and mild summers, shaped by North Wales climate and varied terrain.

Natural Resources Wales flood zone data places LL20 7AF in the high flood risk band. 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.