— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › Winchester › SO21 3 · postcode sector
6,041 people · median £520,000 · Winchester
Cleaner air than mostHigh wellbeing
Winchester Council · Liberal Democrat-controlled 36/45 seats · 80% · OCD 2026
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Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1000.4%
Flood zone2.1% of postcodes
Radonup to 1–3% of homes
Historic landfill19 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 buildings172
Conservation areas7
Green belt0%
Green spaces360
Historic England · OS Open Greenspace
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