Yes, and the risk is the price of admission. Almost every postcode sits within a few minutes' walk of open water. The closest is a stone's throw from the tide. A third of postcodes carry a high rating on at least one flood measure. Living on an archipelago means the sea is not a feature of the view, it is a neighbour with opinions.
Start with rivers and the sea, which is what the Environment Agency's flood zones cover. Roughly 8% of the area's postcodes fall inside flood zone 3, the high-probability band, and about 4% fall inside flood zone 2. Those two are separate tiers rather than nested ones: zone 2 is the extra medium-probability fringe sitting beyond zone 3, which is why it can be the smaller of the two here. A zone figure tells you about river and tidal water arriving, and nothing at all about rain that has nowhere to drain.
Surface water is the risk that does not appear in those zone figures. The brief for this area carries no separate published surface-water share, so the honest position is that it is folded into the combined postcode indicator further down rather than broken out on its own. On granite islands with shallow soils and a lot of hard standing, it is worth asking about at the specific address rather than assuming the zone map has covered it.
The forward look is the figure that should change how a buyer thinks. Once the Environment Agency's climate allowance is applied, about 43% of postcodes fall inside the adjusted flood zone. That is not a prediction of next winter. It is the mapped extent that planners and, increasingly, lenders work from when considering what the coastline does over the life of a building.
For insurance, that combination matters more than the headline. Cover is generally obtainable, but a property inside a high-probability zone can attract a higher premium, a larger excess specific to flood, or a requirement for a survey before terms are offered. Get an indicative quote before instructing a solicitor rather than after, because a refusal or a loaded excess discovered late in a purchase is expensive to unwind.
Taking every indicator together, including surface water, 32% of postcodes rate high on at least one measure, 16% rate medium and 30% rate low. Those bands overlap with the zone figures rather than adding to them, so they describe the same geography through a wider lens rather than a second, separate problem.
Counted as homes rather than postcodes, the Environment Agency's rivers-and-sea mapping puts 272 properties at high risk, 25 at medium and 42 at low, out of 1,943 properties in the postcodes that carry any risk at all. Of the high-risk properties, 113 are residential. Only postcodes with some level of risk appear in that listing, so this is the exposed portion of the islands rather than the whole of them.
Whether anything stands between the water and the building is a separate question, and the answer here is roughly split. About 8% of postcodes sit within the high-risk flood extent with no defence present in the model, and about 7% sit within it with a defence present. Present in the model means a structure exists in the mapping. It does not mean the property is protected, it does not tell you the condition of that structure, and it should never be read as an all-clear.
The proximity is the underlying fact. About 95% of postcodes lie within 500 metres of the coast, which is the threshold the coastal data uses rather than a statement about any individual address. The median distance to the coast across the area is around 100 metres, and the closest postcode sits about 13 metres from it.
Every postcode here falls within a shoreline management plan. The prevailing policy over the twenty-year and fifty-year horizons is hold the line, shifting to managed realignment on the hundred-year horizon. A policy is a stated intention about how defences would be managed. It is not a guarantee of funding, and it is not evidence that a defence already exists in front of a given property. Managed realignment on the long horizon means the stated plan is eventually to let the shoreline move rather than to keep holding it where it is.
On sea level, the nearest long tide gauge record is at Devonport, covering 1962 to 2015, and it shows a measured rise of about 2.35 millimetres a year across that record. That is a historic measurement of what happened, not a forecast of what comes next.
One genuinely encouraging note: the brief records no historic flooding across the area's postcodes. Nothing has been logged. That is worth something, particularly against mapping that looks this exposed, but recorded history is not the same as complete history, and it says nothing about what an adjusted coastline does in future decades.
Flood risk is the weakest thing about these islands and the one that should shape which property you buy rather than whether you buy. Pick the wrong address here and the sea is not an abstraction on a map, it is a feature of your winter.