Eastbourne is built on a silted-up bay. About one in five postcodes sit inside the highest published flood zone. Roughly one in ten carry a high surface-water risk. Under the long-range climate allowance, the at-risk share rises to about four in ten. The honest answer is yes, in patches, and the pattern is geological as much as it is meteorological.
The river and sea zone picture splits neatly. Around one in forty postcodes sit inside the middle flood zone, and about one in five sit inside the highest. The exposure is concentrated where you would expect on a town built where a bay used to be: the low-lying eastern marshes around Langney, the seafront frontages, and the patch towards Pevensey where the coastal plain bleeds into Pevensey Bay. The dry chalk areas to the west of the town centre and up onto the Downs carry virtually none of it. The Downs, predictably, are the safest place to live in Eastbourne.
Surface-water flooding is the modern term for what your grandparents called "the road's flooded again". About one in ten postcodes carry a high surface-water risk and another one in eight a medium one. Roughly a quarter sit at low risk. Most of that is the legacy of the silted bay: drainage on flat ground above a high water table does not ever quite work, and a serious rain event finds the same culverts and gullies it always finds. Modern drainage works adequately on a normal Tuesday. On an extraordinary Tuesday it does what flat ground always does.
The climate allowance is where the picture moves. The Environment Agency's forward-looking flood zone, which factors in projected sea-level rise and increased rainfall intensity, covers around four in ten postcodes. That is a meaningful jump from the current one in five and reflects what the medium-term climate trajectory is expected to bring. The town's coastal management plan responds with a hold-the-line policy at twenty, fifty, and one hundred year horizons, which means defending the coast rather than retreating from it. The sea level along this stretch is rising at roughly two millimetres a year, which is small in any given year and not at all small over the lifetime of a mortgage.
The insurance implication is real but not catastrophic. Properties in the higher flood zones will see higher premiums and tighter underwriting, and some lenders will want a flood-risk report before committing. Homes built since 2009 are not covered by the Flood Re subsidy scheme, so newer-build buyers on the coastal plain need to check their cover carefully and price the gap in. The dry-postcode share of the town carries no such friction. The difference between a property at sea level on the eastern flat and a property on the chalk slope to the west is, in insurance terms, a different financial product.
Flood risk in Eastbourne scores two out of five, which is the honest mid-low end of the safety scale and the price the town pays for being built where a bay used to be. The Downs are safe. The coastal plain is exposed. Choose accordingly.