Does N3 flood?

Yes — parts of the N3 district carry real flood risk: 3 of its 9 at-risk postcodes reach the Environment Agency's High likelihood band. The N3 postcode district covers West Finchley, Mill Hill, close to Totteridge, Finchley, Golders Green, and surrounding villages in parts of England and Hertfordshire.

9 postcodes in the N3 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 3 high, 1 medium, 5 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 N3 postcodes are at risk?

N3 1PN up to High N3 1RE up to High N3 1UH up to High N3 3PU up to Medium N3 1AJ up to Low N3 1AR up to Low N3 1TQ up to Low N3 3ES up to Low N3 3PX up to Low

Rivers and flooding history near N3

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

North Finchley on the Dollis Brook — 1.7 km away, highest on record 2.06m
Hampstead Suburb on the Mutton Brook — 2.5 km away, highest on record 1.99m
Whetstone on the Dollis Brook — 2.7 km away, highest on record 1.07m
Brent Cross on the River Brent — 2.9 km away, highest on record 1.38m

98 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (13 at warning level or above), most recently 27 August 2026. Warnings cover flood areas, not individual addresses.

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

July 2021 flooding — about 2.7 km from the centre
August 2015 flooding — about 3.2 km from the centre
July 2007 flooding — about 3.1 km from the centre
September 1992 flooding — about 3.1 km from the centre

🏠 Buying or renting in N3? 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

N2 N9 N10 N11 N12 N13 N14 N15

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.