How do I check which flood zone my property is in?

Visit the Environment Agency's 'Check your long term flood risk' service at gov.uk or use our county pages to explore local flood areas.

Do flood zones affect property values?

Properties in higher flood risk zones can be worth 5-15% less than comparable properties in low-risk areas. Insurance costs also tend to be higher.

Can flood zones change over time?

Yes. The EA regularly updates flood zone maps to reflect new data, climate change projections, and new flood defences.

Understanding Flood Risk Zones — Complete Guide

What Are Flood Risk Zones?

The Environment Agency divides England into flood zones based on the probability of river and sea flooding, ignoring the presence of defences.

Flood Zone 1 — Low Probability

Land with less than a 1 in 1,000 annual probability of flooding. Most development is appropriate here.

Flood Zone 2 — Medium Probability

Between 1 in 100 and 1 in 1,000 annual probability for river flooding, or between 1 in 200 and 1 in 1,000 for sea flooding.

Flood Zone 3a — High Probability

1 in 100 or greater for river flooding, or 1 in 200 or greater for sea flooding. The functional floodplain.

Flood Zone 3b — Functional Floodplain

Land where water must flow or be stored in times of flood. Only water-compatible or essential infrastructure is acceptable.

How Zones Affect You

Flood zones influence planning decisions, insurance premiums, and mortgage availability. If your property is in Zone 3, you may need a Flood Risk Assessment before any development work.

Checking Your Flood Zone

Use the Environment Agency's Long Term Flood Risk service or check our county pages for local flood area data.