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Does SN11 flood?

Yes — parts of the SN11 district carry real flood risk: 15 of its 41 at-risk postcodes reach the Environment Agency's High likelihood band. The SN11 postcode district sits close to Calne, Tytherton Lucas, Winterbourne Monkton and surrounding villages in Wiltshire.

41 postcodes in the SN11 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 15 high, 2 medium, 24 low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which SN11 postcodes are at risk?

SN11 0JJ up to High SN11 0NT up to High SN11 8DP up to High SN11 8HG up to High SN11 8HQ up to High SN11 8JA up to High SN11 8PR up to High SN11 8QF up to High SN11 8QT up to High SN11 8SH up to High SN11 8TA up to High SN11 8TR up to High SN11 8UJ up to High SN11 9JX up to High SN11 9LJ up to High SN11 0EN up to Medium SN11 8SZ up to Medium SN11 0AY up to Low SN11 0DH up to Low SN11 0DU up to Low SN11 0EF up to Low SN11 0EH up to Low SN11 0HS up to Low SN11 0HT up to Low SN11 0HU up to Low SN11 0LT up to Low SN11 0QX up to Low SN11 0RA up to Low SN11 0RD up to Low SN11 0SG up to Low SN11 0SQ up to Low SN11 8DD up to Low SN11 8EA up to Low SN11 8JT up to Low SN11 8NT up to Low SN11 8NW up to Low SN11 8NZ up to Low SN11 8PA up to Low SN11 8PJ up to Low SN11 8UH up to Low SN11 8XR up to Low

Rivers and flooding history near SN11

The rivers that matter here, each monitored live on FloodRadar:

67 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (67 at warning level or above), most recently 9 February 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

🏠 Buying or renting in SN11? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

SN10 SN12 SN13 SN9 SN14 SN8 SN15 SN7

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.