Yes, in patches, and mostly from rain rather than the sea. Only a small share of the town sits in the river and sea flood zones. About one postcode in seven is rated high risk on at least one flood measure. A third of postcodes are close to the shore. Most of the risk comes from rainwater that can't drain away fast enough.
Start with rivers and the sea. On the Environment Agency's flood-zone mapping, about 3% of Folkestone's postcodes are in Zone 3, the highest-probability band. Another 1% are in Zone 2, the medium-probability band. Zone 2 covers only the area beyond Zone 3, so the two figures don't overlap. Taken together, the zones leave most of the town outside the areas mapped for river and sea flooding.
Surface water is the bigger worry. The Pent Stream once cut a valley through the cliffs, and it now runs through a culvert under the town down to the inner harbour. In August 1996, heavy rain overwhelmed the stream and the local drainage, and homes and businesses on Black Bull Road in the Foord Valley flooded. The risk of rainwater with nowhere to drain doesn't follow the flood-zone boundaries on the Environment Agency's map.
Looking ahead, about 6% of postcodes fall inside the flood zones once the Environment Agency's allowance for climate change is added. That's a modelled view of how far the zones could spread, not a forecast for any particular street.
For insurance, a house on a Zone 3 street, or in a postcode rated high on any measure, may be harder to cover and dearer to insure than one on higher ground a few streets away. Get a quote for the exact address before you commit to buying, not after your offer is accepted.
At postcode level the risk looks wider. Counting any measure, surface water included, about 15% of Folkestone's postcodes rate high on at least one, 19% rate medium on at least one and 32% rate low on at least one. These bands overlap with each other and with the zone figures above, so the percentages can't be added together. They show how far the risk spreads once rainfall is counted alongside rivers and sea.
Counting homes gives a clearer figure. The Environment Agency's river and sea mapping lists 2,525 properties in the Folkestone postcodes that carry some risk. Of those, 357 are at high risk, 507 at medium risk and 515 at low risk. Of the high-risk properties, 283 are homes. Postcodes with no river or sea risk don't appear in that list at all, so these are counts of properties within the affected postcodes, not a share of the whole town.
Then there is the question of defences. About 3% of postcodes fall inside the high-risk flood extent when defences are left out of the model, and the share is still about 3% when they are included. A defence being in the model does not make a property safe. It only shows that something stands between the water and the house, and here it doesn't shrink the high-risk area on the map.
The town is close to the sea. About 35% of postcodes are within 500 metres of the coast, the nearest is about a metre from it and the median distance is about 780 metres. That 500-metre line is a cut-off used in the data. It isn't a verdict on any one address.
The shoreline management plan for this stretch of coast says hold the line for the next twenty, fifty and hundred years. That means the stated intention is to keep the existing defences in place. It isn't a promise of funding and it doesn't build anything new. Treat it as a plan, not as a sea wall.
The nearest tide gauge, at Dover, recorded sea level rising by about 2 millimetres a year between 1961 and 2010. That's the rate the gauge measured over those years, not a forecast.
The historic flood-outline dataset used here records no flooding within the area's postcodes. That's some reassurance, but it only covers what was mapped. Local history includes the 1996 Foord Valley flood, which shows the records don't capture everything.
Flood risk is Folkestone's weak spot, and it is mostly the town's own drainage rather than the Channel. Buy on the higher streets and check any valley-floor address carefully.