Shefford's flood risk is middling, and most of it comes from rainwater, very little from the rivers. Almost none of the town is in a river flood zone. A small number of homes do carry a high river rating. About one postcode in eight is flagged high on some measure once surface water is counted. Two rivers meet in the town, and the rain is what most buyers should be checking for.
The Environment Agency's river-and-sea flood zones barely touch Shefford. About 1% of the town's postcodes are in Zone 2, the medium-probability band, and none at all are in Zone 3, the highest. The two zones are separate bands, with Zone 2 sitting on the edge of where Zone 3 would be, so here the edge exists and the middle does not. Shefford grew up between two fords where the Flit and the Hit were shallow enough to wade, and the rivers have stayed fairly modest since.
Surface water tells a different story. When heavy rain has nowhere to drain, it collects in roads, gardens and low corners, and in Shefford that shows up in the postcode flags below far more than the river zones do.
The Environment Agency's climate-adjusted mapping widens the river-and-sea zone to cover about 4% of the town's postcodes. That is the modelled outlook if river flows increase, and it is still a small part of the town.
For insurance, most Shefford addresses should be ordinary to cover, because the river zones are so thin. The homes that carry a high flag on any measure are the ones where the quote may come back with conditions or a larger excess. Get an indicative quote on the exact postcode at the same time as booking the survey, since that is the moment the flag first becomes your problem.
Counting postcodes flagged on at least one of the Environment Agency's measures, surface water included, about 13% are rated high, 21% medium and 45% low. A postcode only needs one measure to earn a flag, so these shares cover more risk types than the zone figures above and are bound to look worse. Low on this scale still means a small chance in any given year, which is more than none.
Counting homes is more useful. The Environment Agency's rivers-and-sea mapping lists 17 Shefford postcodes with some risk, covering 452 properties. Of those, 7 are rated high, 4 medium, 32 low and 3 very low. Postcodes with no risk at all are not listed, so those 452 are just the properties the mapping considered worth listing in the first place.
On defences, none of Shefford's postcodes lies in the high-risk river extent, whether a defence is modelled there or not. About 1% sit in the low-risk extent with no defence in the model. Even where a defence is modelled, that only means something is there in the model, and the model makes no promise about the kitchen floor.
The nearest tide gauge to Shefford is at Portsmouth, where sea level rose by about 2 millimetres a year on average between 1962 and 2023. Portsmouth is a long way from Bedfordshire, and an inland town between two shallow fords has little reason to watch the tide tables.
Flood risk in Shefford is middling. The rivers trouble only a handful of homes, and surface water decides whether any particular house has a problem or not.