West Malling is mostly dry, but not everywhere. Only a small sliver of the area sits in the highest-risk river flood zone. Around one postcode in ten counts as high risk once rainfall is included. Rivers are a small part of the problem. The risk is low for the area as a whole and high on particular streets, which is why you check the address and not the town.
On the Environment Agency's river-and-sea flood zones, about 1% of the area's postcodes sit in Flood Zone 3, the highest-probability band. None sit in Flood Zone 2, the medium-probability fringe beyond it. The two zones don't overlap, so this isn't a case of the larger zone hiding the smaller. It means that where river flooding does reach, it reaches into the high band, and elsewhere it barely registers.
Surface water is a separate problem. About 2% of postcodes fall inside the Environment Agency's recorded historic flood outlines. There are 13 recorded flood events for the area, and the most recent was in November 1960, caused by local drainage and surface water rather than a river. About 2% of postcodes also sit within the Lower Medway Internal Drainage Board's area, where water levels are actively managed. Here, the risk is mostly rain with nowhere to go.
Looking ahead, the Environment Agency's climate-adjusted flood zone covers about 3% of postcodes. That's a projection of where the high-risk zone could reach, not a map of where water has already been.
For insurance, that split matters. Most homes here should find flood cover routine. A home in the high-risk zone, or on a street with a drainage history, can face higher premiums or a larger excess, and some insurers may ask questions before quoting. Get a quote on the exact address before you instruct a solicitor, not after.
The postcode-level measure is broader. It rates each postcode on several flood indicators, surface water included, and records the worst of them. On that basis, about 9% of postcodes rate high on at least one measure, 11% medium and 28% low. These bands overlap with the flood-zone figures above rather than adding to them, and they're counted in postcodes, not homes.
Counting homes is more useful. The Environment Agency's rivers-and-sea mapping lists 38 postcodes carrying some risk, covering 1,024 properties. Of those, 115 properties are at high risk, 71 at medium and 65 at low. Of the high-risk properties, 98 are homes. Postcodes with no river or sea risk aren't listed at all, so those numbers describe the exposed streets, not the whole area.
On whether anything stands between the water and the house, about 1% of postcodes sit in the high-risk extent with no defence in the model, and about 1% sit in it with a defence present. A modelled defence isn't a guarantee. It means a structure appears in the Environment Agency's model, not that the house behind it will stay dry.
The coast is further away than some of the figures suggest. The closest postcode is about 412 metres from tidal water, and about 2% of postcodes fall within 500 metres of it, a threshold set in the data rather than a verdict on any single house. The typical postcode is about 4,500 metres away.
For that tidal edge, the shoreline management plan's policy for the next 20 years is to hold the line, meaning keep the existing defences where they are. For the 50-year and 100-year horizons, it changes to managed realignment, which means letting the shoreline move back in a planned way. A policy states an intention. It isn't a defence already standing, and it doesn't guarantee one will be built.
At Dover, the nearest tide gauge, sea level rose by about 2.2 millimetres a year across its record from 1961 to 2010. That's a measured historic rate, not a forecast.
Flood risk in West Malling is middling. It's low across most of the area and serious on a small number of streets, so a buyer needs to check the individual address before offering.