— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › North Hertfordshire › SG4 7 · postcode sector
4,989 people · median £695,000 · North Hertfordshire
North Hertfordshire Council · Labour minority — no overall control 23/51 seats · 45% · OCD 2026
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Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1002.9%
Flood zone4.8% of postcodes
Radonup to 1–3% of homes
Historic landfill16 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 buildings233
Conservation areas6
Green belt86.7%
Green spaces227
Historic England · OS Open Greenspace
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