Suburban Area CLIMATE RISK
Marshalswick is a suburb in Hertfordshire, within St Albans council area. This page shows flood, heat, air quality, and subsidence risk data for Marshalswick, drawn from official UK government sources.
Flood risk in Marshalswick is rated Medium based on Environment Agency data for the St Albans area. Individual postcode flood risk can vary — check a specific address above for a postcode-level rating.
Heat risk in Marshalswick is moderate under current projections. Met Office UKCP18 data suggests around 31 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 Marshalswick without adequate ventilation or insulation may face increasing summer heat stress and higher cooling costs as temperatures rise.
Air quality in Marshalswick averages 7.5 µg/m³ PM2.5, which is moderate — 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 Marshalswick 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 Marshalswick for a property-level subsidence risk band.
Anyone buying, renting, or advising on property in Marshalswick 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 Marshalswick.
Council area level (St Albans). Search a postcode for detail.
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