Yes, in parts, and they're the low parts by the river. About one postcode in ten sits in the highest-risk river flood zone. About one in eight carries high risk on at least one flood measure. The higher ground to the north and west is a different story. The river view and the flood risk usually come in the same listing.
On the Environment Agency's river-and-sea flood maps, about 9% of Caversham's postcodes fall in flood zone 3, the highest-probability band, and a further 6% sit in flood zone 2, the medium-probability fringe beyond it. The two zones don't overlap, so zone 2 is an extra band on top of zone 3, not a bigger area that contains it. Most of this is the Thames flood plain around Lower Caversham. Caversham Heights and the streets up towards Emmer Green are on higher ground, where the river matters less.
There's no separate surface-water figure for Caversham. What exists is the flood record: 115 recorded flood events, the most recent in February 2014, with about 13% of the area inside recorded historic flood extents. Rain with nowhere to go is covered by the postcode figures further down, which fold surface water in with the river.
The Environment Agency also maps how the zones look with a climate allowance built in, and under that version about 19% of the area falls in the flood zone. That's a planning scenario, not a forecast for next winter, but it shows how far the risky edge could move over the life of a mortgage.
For insurance, the practical point is that a flood zone address gets priced as one. Homes in the higher zones can find cover harder to arrange and the excess larger, and those details belong in a quote, not in an estate agent's description. Get an indicative quote on the exact address before you instruct a solicitor, not after you've exchanged.
The postcode picture is broader because it counts more kinds of flooding. About 12% of postcodes rate high on at least one flood measure, 22% rate medium on at least one and 32% rate low on at least one. Those bands include surface water alongside river and sea, so they overlap with the flood zone figures above. They're a different measure, not extra risk to add on top.
Counting homes is more useful than counting postcodes. The Environment Agency's river-and-sea mapping lists 3,777 properties in Caversham postcodes that carry some risk. Of those, 435 are at high risk, 1,446 at medium and 1,132 at low. The list only includes postcodes with some risk, so the rest of Caversham doesn't appear in it at all. Four hundred-odd high-risk properties is a street's worth of real exposure, not a statistical footnote.
Then there's the question of defences. About 13% of postcodes fall in the high-risk flood extent when the model ignores defences, and about 13% still do when it includes them. The defences in the model don't shrink the high-risk footprint here. Even where a defence is mapped, that only means it's in the model. It doesn't mean the house next to it stays dry, and any buyer told otherwise should ask who is doing the telling.
The nearest tide gauge, at Portsmouth, recorded sea level rising at about 2 millimetres a year across its record from 1962 to 2023. That's a measured historic rate at a coastal gauge a long way downstream, and it's background here. The Thames is what matters in Caversham.
Flood risk here is middling, and it depends almost entirely on the address. The hill streets have little to worry about, the flood plain does, and the survey will tell you which one you're looking at.