Yes, but from rain, and hardly at all from rivers or the sea. Almost no postcodes sit in the river-and-sea flood zones. Nearly one in five rates high on at least one flood measure. A small cluster of homes is rated high by the river mapping. Sutton's flood problem falls from the sky.
On the Environment Agency's river-and-sea flood zones, fewer than one in a hundred of Sutton's postcodes falls in zone 2, the medium-probability fringe, and fewer still in zone 3, the highest-risk band. The two zones are separate bands, so the outer fringe can hold more postcodes than the core. Either way, the town has very little river to worry about.
Surface water is the real exposure. Sutton is built on a slope, from the lower edge of the North Downs in the south down to Sutton Common in the north, where the Pyl Brook starts. Rain that the drains cannot take in a heavy downpour runs down that slope and gathers on roads and low ground. That is a storm problem, and a river-zone map will never show it.
The Environment Agency's climate-adjusted flood zone adds nothing here, with 0% of postcodes inside it. On rivers and sea, the forward look is the same as today.
Insurance follows the same split. Insurers price surface-water risk as well as river risk, so a home in a low-lying street can cost more to cover than its river-zone status suggests. Get an insurance quote on the exact address early, before you spend money on surveys and solicitors.
The wider measure tells a different story from the zones. About 18% of Sutton's postcodes rate high on at least one flood measure, surface water included, 26% rate medium and 42% rate low. These shares overlap with the zone figures and cover different things, so the two sets of numbers cannot be added together. A seller who says "not in a flood zone" is telling the truth, and it is the least useful thing they could tell you.
Counting homes makes the risk more concrete. The Environment Agency's rivers-and-sea mapping lists only the 14 postcodes that carry some risk, covering 463 properties. Of those, 50 are rated high, 36 of them homes, 15 medium, 129 low and one very low. Most of Sutton does not appear on that list at all.
Very little of the town is shown with defences. Of the postcodes in the Environment Agency's modelled flood extents, about one in a thousand falls in the high-risk extent with no defence present, and the same share with one. A defence in the model means a structure is there. It says nothing about whether it would hold, or whether water would come round it.
The nearest tide gauge to Sutton is at Portsmouth, which measured sea level rising by about 2 millimetres a year between 1962 and 2023. A gauge that far away has very little to say about a town on the North Downs.
No historic flooding is recorded across Sutton. Recorded floods are the ones someone mapped, and storm water in a street is the kind that often goes unmapped. The clean record is still reassuring.
Flood risk is Sutton's weak spot, but the threat is storm water on the slope and the river barely features. A careful buyer can find a dry street without much trouble, while a careless one can end up on the wrong one.