AL10 9

111 sales in the last 12 months · median £390,000 · Welwyn Hatfield

High wellbeing

Welwyn Hatfield Council · Labour / Liberal Democrat coalition 31/48 seats · 65% · OCD 2026

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Environment This postcode sector

NO₂

12.6

— WHO guide

PM2.5

7.5

— WHO guide

µg/m³ annual mean · DEFRA

Surface water 1-in-1001.1%

Flood zone6.1% of postcodes

Radonup to 1–3% of homes

Historic landfill14 sites within ~1 km

EA · UKHSA/BGS · Mining Remediation Authority — indicative, not a property search

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

Listed buildings22

Conservation areas0

Green belt30.3%

Green spaces214

Historic England · OS Open Greenspace

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