Dawlish has a flood problem the size of a few streets, not the size of a town. Most of the place sits outside the flood zones altogether. The risk gathers where the water gathers, down where the stream meets the sea. A few hundred properties carry the serious end of it. Everybody else here is dealing with weather, not water.
The Environment Agency's river-and-sea mapping puts about 5% of the area's postcodes in flood zone 3, the higher-probability band, and about 5% in flood zone 2, which is the additional medium-probability fringe sitting beyond zone 3 rather than a larger area containing it. The two are separate bands, so they describe two thin rings around the same low ground, not one big one.
Surface water is not mapped as its own number for this area, so it turns up folded into the combined postcode indicator rather than standing alone. What the recorded history holds is one flood event, in November 2012, when a main river exceeded its channel capacity with no raised defences involved, and about 0.3% of postcodes fall inside recorded historic flood extents. A thin record is worth something, though the record is a good deal younger than the houses.
Applying the climate allowance widens things. About 10% of postcodes fall within the flood zones once the future allowance is included, which is the figure a mortgage lasting decades ought to be measured against rather than today's line on the map.
For insurance, the practical consequence is that address matters more than town. A property outside the zones should be unremarkable to insurers. One inside them can attract higher premiums, a larger excess, or questions before cover is agreed. Flood Re exists to help with cover for homes at risk, though it does not cover homes built since 2009, so a newer waterside build has no such backstop. Get an indicative quote before you instruct a solicitor, not after.
Taking every indicator together, including surface water alongside rivers and sea, about 8% of postcodes rate high on at least one measure, about 10% medium and about 24% low. Those bands overlap with the flood-zone shares above rather than adding to them, so they describe the same low ground being counted a second way.
The count of homes is the more useful number. Across the 41 postcodes that carry any rivers-and-sea risk at all, the Environment Agency's mapping covers 1,124 properties, of which 276 are rated high, 97 medium, 167 low and 23 very low. Of the high-rated properties, 226 are residential. Postcodes with no risk do not appear in that list at all, so the total is the exposed part of the town rather than the town.
Whether anything stands between the water and the house is a separate question, and the answer is partial. About 5% of postcodes sit inside high-risk undefended extents, against about 4% inside defended ones. Defended in this context means a defence is present in the model. It does not mean the property is safe, it does not describe the condition of that defence, and it is not a reason to relax.
The coast is genuinely close. About 43% of postcodes sit within half a kilometre of it, the nearest comes in at 31 metres, and the median distance across the town is about 544 metres. Living here is not a coastal-adjacent experience, it is a coastal one.
Every postcode in the area is covered by a shoreline management plan, and the stated policy over the twenty, fifty and hundred-year horizons is to hold the line. That is an intention to maintain defences, which is a different thing from a defence that already exists, and different again from a promise anybody can enforce. Policies get reviewed. Water does not read them.
On sea level, the nearest tide gauge at Devonport recorded a rise of about 2.35 millimetres a year across its 1962 to 2015 record. That is a measured historic rate over the period, not a forecast for the next one.
Flood risk here sits in the middle: real, concentrated, and entirely knowable before you exchange. The town is not sinking, but a specific handful of streets carry a load the rest of Dawlish does not, and the only sensible move is to check the exact address rather than the place name.