Does TN21 flood?

Yes — parts of the TN21 district carry real flood risk: 5 of its 14 at-risk postcodes reach the Environment Agency's High likelihood band. The TN21 postcode district covers Horam & Punnetts Town, Chiddingly, East Hoathly & Waldron, Catsfield & Crowhurst, Burwash & the Weald, close to Cowbeech, Lealands, Hellingly, and surrounding villages in East Sussex.

14 postcodes in the TN21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 5 high, 2 medium, 7 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 TN21 postcodes are at risk?

TN21 0HA up to High TN21 0HD up to High TN21 0HF up to High TN21 9ED up to High TN21 9HB up to High TN21 0HE up to Medium TN21 0PD up to Medium TN21 0BP up to Low TN21 0HH up to Low TN21 9AP up to Low TN21 9AR up to Low TN21 9JG up to Low TN21 9JJ up to Low TN21 9PX up to Low

Rivers and flooding history near TN21

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

Cowbeech on the River Cuckmere — 3.4 km away, highest on record 1.84m
COWBEECH GS — 3.4 km away
Leabridge on the River Bull — 5.5 km away, highest on record 2.57m
Hellingly on the River Bull — 6.1 km away, highest on record 3.02m

45 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (45 at warning level or above), most recently 19 February 2026. Warnings cover flood areas, not individual addresses.

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

07420K502FEO_Jan2009_Upper Cuckmere (2009) — about 9.4 km from the centre

🏠 Buying or renting in TN21? 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

TN20 TN22 TN19 TN23 TN18 TN24 TN17 TN25

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.