Kensington is safe from the river and the sea, and less safe from heavy rain. None of it sits in the Environment Agency's river-and-sea flood zones. Around one postcode in eight still rates high on at least one flood measure. That comes from surface water. The Thames is nowhere near the problem, and the drains are most of it.
On the Environment Agency's river-and-sea mapping, 0% of Kensington's postcodes fall in flood zone 3, the highest-probability band, and 0% fall in flood zone 2, the medium-probability band beyond it. As far as rivers and the sea go, there is nothing to report. Those zones only cover water coming out of a river or in off the sea. Water already falling on the streets is measured separately.
Surface water is a different matter. It is the rain that lands on roofs, roads and paving and has nowhere to go when the drains fill up. Kensington is densely built, and most of its ground is hard. Its western edge follows the line of Counter Creek, now marked by the West London railway line. The creek has disappeared from view, though the low ground it ran along is still there. For a basement or lower-ground flat, ask the seller directly whether water has ever come in and whether the property has a pump or a non-return valve. Those details matter more than any area-wide percentage.
The Environment Agency also models a zone that allows for climate change, and about 2% of Kensington's postcodes fall inside it. That small share is the agency's forward look at river and sea flooding, and it covers very little of the area.
Insurers price each address on several measures at once, surface water included, so "not in a flood zone" won't settle a premium on its own. Most Kensington homes should be straightforward to insure. A property on one of the higher-rated postcodes may get more questions from the insurer, or a higher quote, than its river-and-sea zone would suggest.
Counting postcodes that rate on at least one of several flood measures, including surface water alongside rivers and the sea, about 13% of Kensington's postcodes are high, 23% medium and 42% low. One measure is enough to put a postcode in a band, so these shares reflect the worst of several indicators. The rest of the postcodes register no risk on any measure.
On the Environment Agency's modelled flood extents, 0% of Kensington's postcodes are in the high-risk extent with no defence in place, and 0% are in it with a defence present. That says nothing either way about whether a home is safe. Nothing protects these streets from a river because no river reaches them, and no defence scheme exists for a blocked gully.
The nearest tide gauge, at Portsmouth, recorded sea level rising by about 2 millimetres a year over its record from 1962 to 2023. That is the rate measured at that gauge over those years. It is a long way from Kensington, and sea level hardly matters here.
No historic flooding is recorded in the area. That's a good sign, though only floods that were recorded make it into that record, and surface-water flooding in a basement often goes unrecorded.
Kensington's flood risk is middling overall. There is essentially no river or sea threat, but surface water reaches enough postcodes that the exact address and the floor level matter.