Coxheath's flood risk comes from rain, not rivers. None of the village sits in a river or sea flood zone. It's built along a ridge, with the valleys falling away on either side. A minority of postcodes still carry a flag for heavy rainfall. Rain is the thing to check for any particular house. The river isn't.
On the Environment Agency's river-and-sea flood mapping, 0% of Coxheath's postcodes fall in flood zone 3, the highest-probability band, and 0% in flood zone 2, the medium-probability fringe beyond it. The two zones are separate bands and don't overlap, and here both are empty. The geography explains it. The village sits on the southern edge of the greensand ridge that runs through Kent, with the land dropping north into the Medway valley and south into the Low Weald. Rivers have to climb to reach it, and they don't.
Surface water works differently. When heavy rain falls faster than drains and soil can take it, water collects in dips, low roads and the backs of gardens, ridge or no ridge. That's the one kind of flooding Coxheath's position doesn't rule out. It depends on the exact street and the exact slope. A house at the bottom of a gentle fall can have a different story from one twenty doors up.
Looking ahead, the Environment Agency's climate-adjusted flood zone puts 0% of Coxheath's postcodes inside it. On river and sea flooding, the forward look matches the present one.
For insurance, being outside the river and sea zones is the main thing an underwriter looks for, and Coxheath passes. Insurers also run their own models, which include surface water, so an individual address can still price above the village's general picture. Get an indicative quote on the exact address before paying for a survey, not after. Finding out at exchange is the expensive way to learn it.
This site's postcode-level measure counts a postcode if it rates on at least one flood indicator, surface water included. On that basis about 7% of Coxheath's postcodes are high risk on at least one measure, about 8% medium and about 20% low. These bands overlap with each other and measure something different from the flood zones above, so don't add them together or set them against the zone figures. They're the reason the risk here is middling rather than negligible.
The Environment Agency's modelled flood extents put 0% of Coxheath's postcodes in the high-risk river-and-sea extent with no defence, and 0% in it with a defence. Nothing is standing between the water and the houses because, on this model, the river-and-sea water doesn't reach them in the first place. Note that where "defended" does appear on this measure, it only means a defence is present in the model. It doesn't mean the homes behind it are safe.
The nearest coast is about 6 kilometres from the closest part of the village. The shoreline management plan for that stretch of coast sets a policy of holding the line for the next 20 years, then managed realignment over the 50- and 100-year horizons. Holding the line is a stated intention to keep existing defences where they are. Managed realignment means letting the shoreline move back in a controlled way. Neither is a guarantee or a defence that already exists. At this distance and height, it matters more for the wider area than for anyone's back garden in Coxheath.
The nearest tide gauge, at Dover, recorded sea level rising at about 2.2 millimetres a year over its record from 1961 to 2010. That's a measured historic rate at the gauge, not a forecast for Coxheath. A village on a ridge 6 kilometres inland isn't where you'd expect it to show up first.
There's no recorded historic flooding in the area. That's reassuring, because a village with a flood history usually has it written down somewhere. But no recorded flooding isn't proof that nothing ever happened. Ask the sellers directly and read their answer on the property information form.
River and sea flooding isn't a Coxheath problem, but surface water gives it a middling flood picture rather than a clean one. Check the individual house, not the village.