Suburban Area CLIMATE RISK
Penllwyn is a suburb in Caerphilly, within Caerphilly council area. This page shows flood, heat, air quality, and subsidence risk data for Penllwyn, drawn from official UK government sources.
Flood risk in Penllwyn is rated Lower based on Environment Agency data for the Caerphilly area. Individual postcode flood risk can vary — check a specific address above for a postcode-level rating.
Heat risk in Penllwyn is relatively low under current projections. Met Office UKCP18 data suggests around 18 days above 25°C per year in this area by the 2021-2040 period (central estimate, high emissions scenario). These are probabilistic projections — actual outcomes depend on future emissions levels. Properties in Penllwyn without adequate ventilation or insulation may face increasing summer heat stress and higher cooling costs as temperatures rise.
Air quality in Penllwyn averages 5.5 µg/m³ PM2.5, which is relatively low — above the WHO annual mean guideline of 5 µg/m³. Defra UK-AIR monitoring data underpins this figure. PM2.5 levels are typically higher near busy roads, industrial areas, and dense urban centres, and lower in parks, green corridors, and residential backstreets.
Subsidence data for Penllwyn is sourced from the British Geological Survey GeoSure dataset, which maps clay shrink-swell risk across Great Britain. In areas with shrink-swell clay, foundations can shift as soils dry out in summer and re-wet in winter. Properties built before 1980 on clay-rich ground are most exposed. Check a specific postcode for Penllwyn for a property-level subsidence risk band.
Anyone buying, renting, or advising on property in Penllwyn can use LocalRisk to run a free climate risk check on any UK postcode. Each report covers flood risk (Environment Agency), heat projections (Met Office), air quality (Defra), subsidence (BGS), and coastal erosion where applicable — the same underlying datasets used by insurers, conveyancers, and local planning authorities. Use the postcode links above to check a specific address in Penllwyn.
Council area level (Caerphilly). Search a postcode for detail.
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