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Does UB9 flood?

Yes — parts of the UB9 district carry real flood risk: 9 of its 39 at-risk postcodes reach the Environment Agency's High likelihood band. The UB9 postcode district covers Gerrards Cross & Denham, Harefield Village, Chorleywood South & Maple Cross, close to Denham, Uxbridge, Ickenham, and surrounding villages in parts of Greater London and Buckinghamshire.

39 postcodes in the UB9 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 9 high, 15 medium, 11 low, 4 very 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 UB9 postcodes are at risk?

UB9 4AF up to High UB9 4BS up to High UB9 4DQ up to High UB9 4HE up to High UB9 6LU up to High UB9 6LZ up to High UB9 6PB up to High UB9 6PD up to High UB9 6PG up to High UB9 4AG up to Medium UB9 4AH up to Medium UB9 4AJ up to Medium UB9 4AL up to Medium UB9 4AN up to Medium UB9 4AP up to Medium UB9 4AQ up to Medium UB9 4AR up to Medium UB9 4AU up to Medium UB9 4AW up to Medium UB9 4AY up to Medium UB9 4AZ up to Medium UB9 4DA up to Medium UB9 5AS up to Medium UB9 6PE up to Medium UB9 4AT up to Low UB9 4BT up to Low UB9 5AH up to Low UB9 5AJ up to Low UB9 5BE up to Low UB9 5HE up to Low UB9 5PG up to Low UB9 6FH up to Low UB9 6HL up to Low UB9 6HZ up to Low UB9 6LS up to Low UB9 4BE up to Very low UB9 4DH up to Very low UB9 4DN up to Very low UB9 4DY up to Very low

Rivers and flooding history near UB9

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

239 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (19 at warning level or above), most recently 28 August 2026. Warnings cover flood areas, not individual addresses.

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

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in UB9? 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

UB10 UB8 UB7 UB6 UB5 UB4 UB3 UB2

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.