Rivers and the sea leave Boorley Green alone, but rain is another matter. None of it sits in a river or sea flood zone. About one in five postcodes still flags high on at least one flood measure. Nothing on record shows it has flooded before. The water to worry about here comes down, not over the bank.
Start with the measure most buyers have heard of. According to the Environment Agency's river-and-sea mapping, 0% of the area's postcodes are in flood zone 3, the highest-probability band, and 0% are in flood zone 2, the medium-probability fringe outside it. No river is coming for these houses, and neither is the Solent. A seller will lead with that. It's true, and it doesn't cover everything.
Surface water is the gap. Those zones only measure rivers and the sea, so the risk that shows up elsewhere in this answer comes from the other indicators, and surface water is one of them. That's rain landing faster than drains, gardens and roads can take it away, and it pools on the low ground of a street regardless of how far the nearest river is. It's also the risk a river-and-sea flood-zone search is least likely to flag.
Looking ahead, the Environment Agency's climate-adjusted flood zone covers 0% of the area's postcodes. Even with future river and sea levels allowed for, the zone doesn't reach Boorley Green. That's reassuring about rivers and the sea, and it says nothing either way about rain.
For insurance, the clean flood-zone result should keep most quotes out of the problem pile. Postcodes that flag high for surface water can still get asked awkward questions, and underwriters check their own maps, whatever the listing says. Get an indicative quote on the exact address before the solicitor starts charging, not after exchange. Running the address through the government's long-term flood-risk checker takes a couple of minutes.
The postcode-level measures fold surface water in alongside rivers and sea, and here they paint a different picture from the zones. Of the postcodes assessed, about 20% rate high on at least one flood measure, about 19% medium and about 28% low. These bands overlap with each other and measure something different from the flood zones, so they shouldn't be added together or read as the same thing. What they show is that a clean flood-zone result and a clean postcode aren't the same promise.
On defences, the modelled flood extents put 0% of postcodes in the high-risk area with defences and 0% without them. With nothing in that modelled extent, there's nothing for a defence to hold back. The absence of a flood wall reflects the model's view that one isn't needed here, not a gap someone forgot to fill.
The coast sits about 2 kilometres away for the typical postcode. The shoreline management plan for the nearest stretch records no active intervention across all three horizons, 20, 50 and 100 years. That's a stated intention not to build or maintain defences on that frontage, not a threat, and the distance and the empty flood zones are why it matters little here.
At the nearest tide gauge, Portsmouth, the sea rose by about 2 millimetres a year over its record from 1962 to 2023. That's a measured historic rate, not a forecast, and with the coast about 2 kilometres off and no postcode in a sea flood zone, it's background rather than a pressing problem for Boorley Green.
The records show no historic flooding in the area. That counts for something, since plenty of places can't say it. It isn't a guarantee, though, because unrecorded flooding happens, and surface water in particular tends to show up as a wet driveway and an insurance claim rather than in any register.
Flood risk is a weak point for Boorley Green, even though the rivers and the sea aren't to blame. Check surface water on the specific address before committing, because that's where the risk sits.