— ACRERIGHT AREA REPORT · POSTCODE SECTOR
Home › North Hertfordshire › SG4 9 · postcode sector
9,347 people · median £465,000 · North Hertfordshire
Among the least deprived
North Hertfordshire Council · Labour minority — no overall control 23/51 seats · 45% · OCD 2026
Loading…
Loading…
Loading…
Loading…
Loading…
Loading…
Loading…
Environment This postcode sector
Air quality
µg/m³ annual mean · DEFRA
Ground checks
Surface water 1-in-1005.2%
Flood zone2.2% of postcodes
Radonup to 1–3% of homes
Historic landfill10 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 buildings156
Conservation areas4
Green belt23.4%
Green spaces227
Historic England · OS Open Greenspace
Loading…