BeforeIBuyHonest. Maybe too honest.
№ 04 / 09 · Flood risk

Is Henfield at risk of flooding?

For anyone buying or renting in Henfield.

Mostly no, with a specific caveat that matters more than the headline suggests. Environment Agency river and sea flood zones cover less than 1% of the village. Surface water is the busier picture: roughly one in nine postcodes carries some high-risk indicator. Climate-adjusted future flood zones stay small. The honest version is that the village average is reassuring and the address-specific answer depends entirely on which postcode you're looking at.

The river and sea picture is the simple bit. Environment Agency flood zone 2, the lower-probability band, covers about 0.6% of the village. Flood zone 3, the higher-probability band, registers as zero. Historic flooding covers about 0.6% as well, which sits in roughly the same footprint. The river risk that does exist is concentrated and well-mapped rather than spread thinly across the wider stock. If your prospective house isn't in the river footprint, it isn't getting wet from a river in any predictable way.

Surface water is where the picture gets more honest. About 11% of postcodes carry a high indicator for surface or groundwater flooding, about 9% carry a medium indicator, and around 29% carry a low one. That means the village average is reassuring, but the variation between streets is meaningful. A storm dumping serious rainfall finds the low-lying corners first, and those corners exist here. A buyer should be running the specific address through the public flood-risk check rather than relying on the village-level figure. The headline number isn't wrong, it just doesn't tell you about your garden.

The climate-allowance picture is the forward-looking version of the river-and-sea one, and it stays small. The climate-adjusted flood zone still covers about 0.6% of the village, which means the climate model isn't pushing the river zones outward in a way that would change the picture meaningfully over a typical mortgage horizon. The forward-looking risk is mainly an extension of today's surface-water reality, not a new river footprint.

Insurance follows the picture. For most of the village, flood cover is a non-issue and premiums won't be loaded for flood risk. For addresses inside the high surface-water indicator or the small river footprint, premiums will reflect that, and the cover-of-last-resort scheme Flood Re is available for properties built before 2009 (it does not cover homes built since then). A buyer in a flagged address should ask the seller for the current insurance schedule and any recent claims history before exchange, because that conversation reveals the reality faster than any postcode-level number.

Average overall, with the qualifier that average hides the split. The village isn't a flood risk; some addresses in it are. Check the specific one before you commit.

Check it for your address. Flood risk can change from one street to the next, so look up the exact address on the government's long term flood risk service.

Sources: Environment Agency

Data to May 2026 · Figures checked 29 June 2026 (what this means)