Mostly not, and where it is, the risk has a very short address list. The town climbs steeply from the River Kensey up to the hill the castle stands on, and water has no interest in climbing. Most of the built-up area sits above the problem. A small number of properties sit in it. That is the whole answer, and everything below is just the arithmetic behind it.
Start with rivers and sea. The Environment Agency's flood zones cover about 3% of the area's postcodes in Zone 3, the higher-probability band, and about 1% in Zone 2. Those two are separate rings rather than one inside the other, so Zone 2 being the smaller number is not a mistake. It is the medium-probability fringe sitting outside Zone 3, and in a town shaped like this one there is simply not much fringe before the ground starts going uphill.
Surface water is the part nobody looks at until it happens, and here it is not published as a figure of its own. It sits bundled into the postcode-level indicators further down, which fold rainwater running off hard ground in with rivers and sea. In practice this is a town of steep streets, and steep streets move water fast rather than holding it. Where it ends up is the low ground by the Kensey, around Newport, which has been the flood-prone end of Launceston for as long as anyone has been writing it down.
Looking forward rather than back, the Environment Agency's climate-adjusted zone raises the share to about 4% of postcodes. That is a modest widening of an already narrow band, not a redrawing of the town.
For insurance, none of this makes Launceston a difficult place to cover, but it makes the specific address the only thing that matters. Insurers price the property, not the town, and a postcode inside the higher-risk mapping will bring questions at quote stage and, in some cases, a different excess. Getting an indicative quote before instructing a solicitor costs nothing and settles the argument early.
On the broader postcode-level indicators, which flag a postcode if it rates on at least one measure including surface water, about 7% come out high, 10% medium and 27% low. Those bands overlap with the flood zones rather than sitting alongside them, so they are a wider net catching the same water, not an additional set of homes at risk.
Counted as buildings instead of postcodes, the numbers get more useful. The Environment Agency's rivers-and-sea mapping lists 518 properties across the postcodes that carry any risk at all, and only postcodes with some risk appear on that list in the first place. Within them, 43 properties sit at high risk, 50 at medium and 85 at low. Of the high-risk ones, 35 are residential. Those 35 homes are the entire practical question here.
Whether anything stands between the water and the building is the part most flood summaries skip. About 3% of postcodes fall inside the modelled high-risk extent with a defence present in the model, and about 3% fall inside it with nothing modelled at all. Defended is a modelling term, not a promise, and it should be read as a defence exists there rather than the water has been handled. Four flood events are on record for the area, the most recent in December 1979, when the channel took more than it could carry and there were no raised defences to argue with.
Sea level barely enters into it, since the town is inland. The nearest tide gauge is at Devonport, where the record from 1962 to 2015 measured a rise of about 2.35 millimetres a year. That is a historic measurement over that period rather than a projection, and it bears on the estuary system rather than on anybody's front door here.
Flood risk in Launceston is middling, which is to say ordinary: real for a handful of addresses at the bottom, irrelevant for most of the rest. Check the specific house, not the town, because the town is not the thing that floods.