Mostly no, with one short stretch saying yes. The Environment Agency's formal flood zones cover less than one percent of the area. No part has a recorded historic flood. The coast sits on average a little over 800 metres from the typical postcode. The risk is real where the coast is close, and ordinary almost everywhere else.
The river and sea zones are quiet. The Environment Agency's flood zone two, the area at low-to-medium tidal or fluvial risk, covers effectively none of Lee. Zone three, the higher-risk band, sits at under one percent. The shore is doing the work here: the closest postcode is around forty metres from the water, and the seafront strip is what the formal zones actually map. Step back two streets and the formal-zone picture is empty.
Surface water is the more interesting story and a bigger share of the answer. Roughly four in a hundred postcodes carry at least a high risk somewhere within them. Roughly eight in a hundred carry at least a medium risk. About one in four carry at least a low risk in some part. That sounds large until you remember that most of southern England has a low-risk pocket on a wet enough day. The bands worth looking at are the medium and high ones, and they sit in the same coastal-leaning stretch as the formal zones.
The climate-adjusted future zone climbs from under one percent today to about two percent under projection, which is the Environment Agency drawing a line for a wetter and slightly higher-sea-level scenario. The Portsmouth tide gauge, the nearest long-term record running from 1962 to 2023, shows the sea rising at about two millimetres a year. The Shoreline Management Plan policy for the area's coast is hold the line across the twenty, fifty, and hundred-year horizons. The defences are intended to stay where they are, which is reassuring on paper and also the cheapest sentence the policy-writer has to commit to.
Insurance behaves accordingly. A property a few streets inland, behind a hedge and away from the seafront strip, will not see premium pricing move much because of the postcode. A property inside the formal flood zone, or one with a documented surface-water hotspot, is where premiums attract sharper questions and where a specialist policy is often the easier route. The single most useful step a buyer can take is to request a search that includes the surface-water layer, not just the river-and-sea map. Most disputes after a flood come down to a buyer who looked at the wrong map.
Low risk overall, with a coastal strip that demands the second-look survey and a willingness to read the surface-water layer with attention.