Check Flood Risk for Any UK Property or Postcode
Find the flood risk rating for any UK address using Environment Agency data. Enter a postcode or address below to see flood zone, surface water risk, and river flood risk.
Select an address above to see flood risk data.
Understanding flood zones
Less than 0.1% annual probability of flooding. Most UK properties fall in this zone.
0.1–1% annual probability. Properties should have flood resilience measures considered.
Greater than 1% annual probability. Flood risk assessment required for new development.
Designed to store and convey floodwater. Most new residential development not permitted.
Flood risk API for developers
Building a property application? The Homedata flood risk API returns Environment Agency flood zone and risk band data for any UPRN as structured JSON — integrate it into property reports, mortgage workflows, or risk dashboards. Free tier includes 100 calls/month.
GET /api/properties/10023456789/flood-risk/
Authorization: Api-Key YOUR_KEY
{
"uprn": "10023456789",
"flood_zone": "1",
"surface_water_risk": "low",
"river_risk": "very_low",
"coastal_risk": "very_low",
"groundwater_risk": "low",
"ea_risk_band": "very_low"
}Frequently asked questions
How do I check the flood risk of a property?
Enter an address or postcode in the checker above to see the Environment Agency flood zone and risk ratings for surface water, river, coastal, and groundwater flooding.
What do the flood zones mean?
Zone 1 = very low risk (<0.1% annual probability). Zone 2 = medium (0.1–1%). Zone 3a = high (>1%). Zone 3b = functional floodplain where most new residential development is not permitted.
Does flood risk affect house prices?
Zone 3 properties can see 5–20% price discounts and may face restricted mortgage availability and higher buildings insurance costs. The Flood Re scheme subsidises premiums for eligible pre-2009 homes.
Does the tool show surface water flooding?
Yes — surface water (pluvial) flood risk is shown alongside river, coastal, and groundwater risk. Many properties at risk from surface water flooding do not sit inside an Environment Agency flood zone.
Do sellers have to disclose flood risk?
Sellers must complete a TA6 form covering past flooding incidents, but this does not cover future risk. Always run an independent flood risk check before exchanging contracts.
Is this checker free?
Yes — completely free, no signup required. The developer API has a free tier of 100 calls/month.
What is a flood risk checker?
A flood risk checker is a tool that looks up the flood zone classification and risk band for a specific property or postcode. In England, the Environment Agency publishes flood risk data for every property under the Risk of Flooding from Rivers and Sea (RoFRS) dataset. Homedata pulls that data and surfaces it alongside separate risk bands for surface water, coastal, and groundwater flooding — four distinct risk types that can each affect a property in different ways.
Flood zones vs flood risk bands — what's the difference?
Flood zones (1, 2, 3a, 3b) describe the probability of river or coastal flooding over a one-year period. They are the primary classification used by the planning system: developers must prepare a Flood Risk Assessment for most proposals in Zones 2 and 3, and Zone 3b (functional floodplain) is essentially off-limits for new homes.
Risk bands (very low, low, medium, high) are used separately to describe surface water flooding — the type caused when heavy rainfall exceeds the capacity of drains and overwhelms the surface. A property can sit in Flood Zone 1 (low river risk) but still carry a medium or high surface water flood risk, particularly in urban areas with dense impermeable surfaces.
Why check flood risk before buying?
There are four practical reasons to run a flood risk check before committing to a purchase:
- Insurance costs. Buildings insurance for Zone 3 properties can cost significantly more than for Zone 1 equivalents. The Flood Re reinsurance scheme caps premiums for eligible homes (built before 1 January 2009), but properties built after that date are excluded and may face very high premiums or outright refusals.
- Mortgage availability. Some lenders decline applications on properties in Zone 3 or require an enhanced flood risk assessment. Knowing the zone before applying saves wasted survey and valuation fees.
- TA6 disclosure gaps. The standard seller's TA6 form asks whether the property has flooded, not what its risk rating is. A property that has never flooded can still sit in a high-risk zone — and a property that has flooded before may not be in an EA flood zone at all (surface water flooding is common even in Zone 1 areas).
- Resale value. Research from the Environment Agency and academic studies consistently finds that high flood risk depresses prices and can slow sales. Understanding risk before purchase helps buyers negotiate accordingly.
What the Homedata flood risk checker covers
The checker uses the Homedata property data API to return four risk dimensions for any UK property:
- Flood zone — the EA classification (1, 2, 3a, or 3b) based on river and coastal flood probability
- Surface water risk — EA risk band for pluvial flooding (very low / low / medium / high)
- River risk — EA fluvial flood risk band
- Coastal risk — EA tidal/coastal flood risk band
Data is sourced from the Environment Agency's open data under the Open Government Licence. Last reviewed: May 2026.