— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › St Albans › AL3 5 · postcode sector
8,197 people · median £670,000 · St Albans
High wellbeing
St Albans Council · Liberal Democrat-controlled 44/56 seats · 79% · OCD 2026
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Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1002.2%
Flood zone0% of postcodes
RadonAffected Area (up to 3–5%)
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 buildings202
Conservation areas17
Green belt19.2%
Green spaces167
Historic England · OS Open Greenspace
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