Yes, in patches, and the river isn't the main threat. Only a small share of postcodes fall in the river flood zones. About one in six is rated high risk on at least one flood measure. The official record shows no flooding at all. Most of the risk comes from rain falling on the town, not from the water running past it.
The River Blackwater marks Sandhurst's southern edge, with the Yateley Lakes along it. In the Environment Agency's river-and-sea mapping, about 2% of the area's postcodes are in Flood Zone 3, the highest-probability band, and about 1% more are in Flood Zone 2, the medium-probability band just beyond it. The two bands don't overlap, so the second figure is on top of the first. By river and sea alone, Sandhurst is mostly dry ground.
Surface water is a different matter, and it's the one buyers skip because there's no river in sight to worry them. There's no separate surface-water share for Sandhurst on its own. It shows up in the postcode measure further down, which counts surface water alongside rivers and sea, and that's where the numbers jump.
The Environment Agency's climate-change allowance adds nothing here. None of the area's postcodes falls inside the extra zone that allowance maps. The river flood zones aren't expected to creep outwards on current modelling, which counts for something.
Insurers price by address, not by town. A house on a flagged postcode can get a noticeably worse quote than one two streets away. Ask for an indicative quote before you pay for a survey, not after, because that's when the real cost of a flood flag becomes clear.
Across every postcode, with surface water, rivers and sea all counted, about 16% are rated high risk on at least one measure, about 19% medium and about 39% low. These bands overlap with the river-and-sea zones above, so the figures can't be added together. The gap between the 2% in Zone 3 and the 16% flagged high is the part to take seriously, and nearly all of it comes from water that never goes near the river.
Counted as homes, the Environment Agency's rivers-and-sea mapping lists 653 properties in postcodes carrying some risk. Of those, 234 are rated high, 69 medium and 77 low, and 212 of the high-risk ones are homes, not commercial buildings. Only postcodes with some river-and-sea risk appear in that count at all, across 28 of them. A few hundred homes, clustered in a few dozen postcodes, is a far more useful thing to know than a percentage.
On whether anything stands between the water and the house, the modelled high-probability flood extent covers about 5% of postcodes without defences and about 5% with them. The defences in the model don't shrink that footprint. "Defended" means a defence exists in the model. It doesn't mean the house stays dry, and a listing that says otherwise is marketing, not a survey.
The nearest tide gauge is at Portsmouth, where sea level rose by about 2 millimetres a year over the record from 1962 to 2023. That's a measured past rate, not a forecast, and for a town this far inland it matters mostly to people who talk about the weather for fun.
The Environment Agency has no recorded historic flood outlines anywhere in the area. That's reassuring, but it only means nothing was mapped, not that no garden ever filled up. Ask the seller directly, and get the answer in writing.
Flood risk is Sandhurst's weakest point: there's little to fear from the river, but enough surface-water risk that the exact address needs checking before you make any offer.