— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › Horsham › RH20 1 · postcode sector
5,010 people · median £480,000 · Horsham
Cleaner air than most
Horsham Council · Liberal Democrat-controlled 26/48 seats · 54% · OCD 2026
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Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1000%
Flood zone1% of postcodes
RadonAffected Area (up to 5–10%)
Historic landfill7 sites within ~1 km
EA · UKHSA/BGS · Mining Remediation Authority — indicative, not a property search
Transport noise (Defra)
Road & rail noise bands (≥55 / ≥65 dB Lden) are being added — not yet available for this area. They cover major sources only; "not mapped" ≠ "quiet".
Defra strategic noise mapping
Heritage & green space
Listed buildings308
Conservation areas13
Green belt0%
Green spaces2,375
Historic England · OS Open Greenspace
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