Yes. Dymchurch is at real risk of flooding, and the defences are the only reason anyone lives here. Almost every postcode sits in the highest river-and-sea flood zone. Most homes are a short walk from the sea. The official plan is to keep holding the water back. Being defended doesn't make a place dry, and a buyer here needs to understand the difference.
The Environment Agency's river-and-sea flood zones put 98% of the Dymchurch area's postcodes in Flood Zone 3, the highest-probability band, and 0% in Flood Zone 2. The two zones are separate bands, with Zone 2 being the medium-probability fringe outside Zone 3. The zero here doesn't mean there's no medium-risk ground. It means there's almost nowhere left that isn't already in the top band. Listings in the area will mention the sea views and leave the flood zone out.
There's no separate surface-water share for Dymchurch in these figures. Surface water is included in the postcode indicators below. The Environment Agency's record of past flooding covers under 1% of the area, with one recorded event, from a main river in 1990. A short history is reassuring only until you check which zone the house is in.
Looking ahead, the climate-adjusted flood zone takes in over 99% of postcodes. Allowing for climate change doesn't add much here, because nearly everywhere was already inside the zone.
For insurance, a Flood Zone 3 address on the coast is something insurers will price and may ask about in detail. Get a quote for the specific property before you commit to a surveyor or a solicitor. Don't assume last year's premium on a similar bungalow tells you anything about the next one.
The postcode indicators, which count rivers, sea and surface water together, put about 18% of postcodes at high risk on at least one measure, 16% at medium and 40% at low. These bands overlap with the flood-zone figures above and measure something different, so the two shouldn't be added together or read as the same thing.
The Environment Agency's rivers-and-sea mapping counts properties rather than postcodes. Of the 5,624 properties in postcodes that carry some risk, 334 are at high risk, 143 at medium, 763 at low and 4,345 at very low. Of the high-risk properties, 274 are homes. Postcodes with no risk at all don't appear in this count.
The key question is what stands between the water and the house. Without defences, the high-probability flood extent covers 98% of postcodes. With the defences included in the model, it covers 13%. "Defended" means a defence is present in the model, not that the property is safe. It depends on the defence being maintained, and on it holding when it matters. The whole area also sits within the Romney Marshes Area Internal Drainage Board, which manages the water levels on the Marsh.
The sea is very close. About 65% of postcodes are within 500 metres of the coast, the nearest just 30 metres from it, and the median postcode about 320 metres away. The 500-metre line is a threshold used in the figures, not a description of any single house.
The shoreline management plan's policy for this stretch is to hold the line at the 20, 50 and 100-year horizons. That is a stated intention to keep maintaining defences over those periods. It isn't a guarantee, it isn't funded forever, and it doesn't build anything that isn't already there.
At Dover, the nearest tide gauge, sea level rose at about 2 millimetres a year over the record from 1961 to 2010. That's a measured historic rate, not a forecast. Every year of it has been added to the height the defences have to hold back.
Flood risk is Dymchurch's weakest point by a distance. The village is safe only as long as the defences are maintained, and a buyer should take that as the main condition of living here.