Paddington is clear of river and sea flooding, but it has a real problem with rain. No postcode here sits in a river or sea flood zone. About one in five rates high on at least one flood measure once surface water is counted. Nothing is on record as having flooded. The threat comes from the drains, and the Thames has nothing to do with it.
The Environment Agency's river-and-sea mapping puts 0% of Paddington's postcodes in flood zone 3, the highest-probability band, and 0% in flood zone 2, the medium-probability fringe beyond it. On that measure the district is clear. The Thames is too far away and too far below to be a factor, and the canals that meet at Little Venice and Paddington Basin are not counted as rivers in that mapping.
Surface water tells a different story. On the Environment Agency's postcode indicators, which put surface water alongside rivers and the sea, about 20% of Paddington's postcodes rate high on at least one measure, about 17% medium and about 29% low. The figure counts a postcode if any one of those measures flags it, and here it is the rain doing nearly all of the work, because the river-and-sea zones are empty. The risk comes from a downpour landing on a dense run of streets, roofs and railway land faster than the sewers can take it.
The climate-adjusted version of the river-and-sea zones also puts 0% of postcodes inside, so the forward look on that measure changes nothing. That allowance covers rivers and the sea only, so it has nothing to say about the rainfall that matters here.
For insurance, the absence from river and sea zones helps, but insurers price surface-water risk too, and a postcode that rates high for it can get a dearer quote or more questions than a buyer expected for a flat this far from any river. Lower-ground-floor and basement flats are where surface water tends to cause trouble, so look up the specific address on the Environment Agency's long-term flood risk service, surface-water layer included, and get an indicative insurance quote while the solicitor is still on the searches.
The Environment Agency's modelled extents for the most serious flooding cover 0% of Paddington's postcodes, whether or not defences are included, so on that model there is no high-probability flood area here at all, defended or otherwise. Even where a model does show a defence, that only means one exists in the model, which is a long way from a promise that a particular front door stays dry.
The nearest tide gauge with a long record is at Portsmouth, where sea level rose by about 2 millimetres a year between 1962 and 2023. That is the rate measured on the south coast over those years, and Paddington is a long train journey inland from it.
No flooding is on record anywhere in the area. That is reassuring as far as it goes, though a record covers only the events someone wrote down, and a flooded basement flat on a single street rarely makes it into the history.
Flood risk is one of Paddington's weaker points, and almost all of it is rain with nowhere to drain, which matters most to anyone buying below street level.