SW1A 1AA
Westminster · Cities of London and Westminster
Public environmental + risk report for postcode SW1A 1AA. Sourced live from ONS, Police.uk, Environment Agency, UKHSA, the Coal Authority, and the BGS knotweed network.
Geography
Outcode SW1A. Local authority Westminster. Constituency Cities of London and Westminster. Coordinates 51.5010, -0.1416.
Crime
Police.uk: 3173 recorded crimes in the most recent 12-month window.
- vehicle: 1259 (down)
- asb: 6294 (flat)
- violence: 6366 (flat)
- theft: 27372 (down)
- drugs: 1442 (up)
- burglary: 911 (down)
- criminal-damage: 1078 (flat)
- public-order: 2108 (flat)
Flood risk
River and sea:lowSurface water:medium
Medium flood-risk area. Recommended: an EA Flood Risk Report or Floodline check. Insurers typically still cover but premiums reflect the risk band.
Nearest gauge: Walthamstow, Low Hall
Radon
UKHSA band:very-low
No elevated radon expected for this postcode area. No action required.
Coal mining
Coal Authority band:none
Coal-mining lookup unavailable (index not loaded). Treated as "not screened" rather than failing the request.
Contaminated land + landfill
Band:lowLandfill:low
No contaminated-land entries returned by the LA register; no nearby landfill activity. Standard residential conveyance applies.
Contaminated-land register coverage is partial; only Local Authorities with a wired adapter are queried. EA landfill data is national. A "low/none" verdict from this lookup is NOT a guarantee that the property is uncontaminated; commission a full EA Environmental Search through a chartered surveyor before exchange.
Japanese knotweed
Sighting density:low
No notable knotweed activity recorded in this postcode area. Standard TA6 disclosure questions still apply.
Knotweed band is proxy-derived from INNS / iRecord public sightings aggregated to postcode-area resolution. It is NOT a property-level survey. A buyer should still rely on the seller's TA6 disclosure + a chartered surveyor's field check before exchange.
Last updated 2026-06-20. Data refreshed every 30 days. This is a free public summary; the full structured report is available via the Stratum Postcode Intelligence API.
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