HouseDossier
Flood Risk Check

Flood Risk Check UK -
Know Before You Buy

Over 5.2 million homes in England are at risk of flooding. Check any UK address against four separate flood risk datasets from the Environment Agency - instantly.

Try a postcode (SW1A 2AA) or “12 SW1A 2AA”. Covers England and Wales.

Free preview always included. Full flood report from £9.95.

Why This Matters

Flooding Is the UK's Costliest Natural Hazard

Flooding causes more property damage in the UK than any other natural hazard. The Environment Agency estimates that over 5.2 million properties in England are at risk from flooding - that is roughly one in six. Yet many buyers are unaware of a property's flood history or risk designation until they have already exchanged contracts.

The UK's changing climate is making the position worse. Winter rainfall has increased by around 17% since the 1960s, and the winter of 2023–24 saw record flooding across Yorkshire, the Midlands, and the South West, with thousands of homes damaged and average repair costs of £30,000 to £50,000 per property.

5.2M

homes at flood risk in England

Environment Agency

£1.3Bn

annual flood damage to UK properties

ABI

1 in 6

properties at risk of surface water flooding

EA Surface Water Map

20–30%

reduction in property value in high-risk zones

RICS research

What HouseDossier Checks

Four Types of Flood Risk - All Covered

Most flood checkers only show one risk type. Our report queries the Environment Agency's full suite of flood risk datasets - the same data your solicitor's environmental search pulls from.

River (Fluvial) Flooding

Flood zones 1, 2 and 3 from the EA Flood Map for Planning. Includes the functional floodplain designation (Zone 3b) which severely restricts development.

Surface Water Flooding

Risk from rainfall overwhelming drainage systems - increasingly common in urban areas. Mapped separately to fluvial risk; many Zone 1 properties are at medium or high surface water risk.

Groundwater Flooding

Saturation flooding from rising water tables, common in chalk and limestone areas including parts of Sussex, Kent, and the Chilterns. Particularly damaging to basements and foundations.

Coastal Erosion Risk

Shoreline Management Plan data showing whether a property is at risk of coastal erosion over 20, 50 or 100-year horizons - critical for coastal properties in Norfolk, Yorkshire and the South West.

Also included in the Full Dossier

  • Active EA flood warnings at time of report
  • Historic flood events at the property
  • Insurance flood band estimate (Flood Re eligibility)
  • Distance to nearest watercourse
  • Reservoir inundation zone (for major dams)
  • Climate change uplift projections to 2050

How It Works

Your Flood Risk Report in 60 Seconds

01

Enter the property address or postcode

We identify the precise property using UPRN (Unique Property Reference Number) from Ordnance Survey - so the data is matched to the exact building, not just the general area.

02

We query the Environment Agency APIs live

Our system calls the EA Flood Map for Planning, Surface Water map, Groundwater Flooding Susceptibility dataset, and Coastal Erosion data in parallel. No cached or stale results.

03

Receive a clear, actionable flood risk summary

Your report translates technical flood zone designations into plain English risk ratings - low, medium, or high - with specific notes on what the designation means for insurance and development.

Report Preview

What You'll See in Your Flood Risk Report

Environmental & Climate Risk

Section 04 of your HouseDossier report

  • EA Flood Zone designation (Zone 1 / 2 / 3a / 3b)
  • Surface water flood risk (low / medium / high)
  • Groundwater flooding susceptibility
  • Coastal erosion risk (20/50/100-year horizon)
  • Plain-English risk summary for each flood type
  • Insurance implications and Flood Re eligibility indicator
  • Active EA flood warnings at time of generation
  • Nearby watercourses (rivers, streams, drains)
  • Historic flood records at or near the property
  • Climate change projections for the property location

Pricing

Simple, One-Off Pricing

No subscriptions. One report, one payment.

Quick Check

£9.95per report

Core flood risk data for pre-offer due diligence.

  • EA Flood Zone (all 4 types)
  • Surface water risk
  • Plain-English risk summary
  • Insurance indicator
Get Quick Check
RECOMMENDED

Full Dossier

£19.95per report

Complete flood intelligence plus 14 other report sections.

  • Everything in Quick Check
  • Historic flood event records
  • Climate change projections
  • Reservoir inundation zone
  • Active flood warnings
  • 14 additional report sections
Get Full Dossier

FAQ

Flood Risk - Frequently Asked Questions

What does Flood Zone 1, 2 and 3 mean in England?
The Environment Agency divides flood risk into three zones. Zone 1 has a less than 0.1% annual probability of flooding from rivers or the sea - most properties sit here. Zone 2 carries a 0.1% to 1% annual probability. Zone 3 has a 1% or greater annual probability from rivers, or 0.5% or greater from the sea. Zone 3 is further subdivided into 3a (functional floodplain) and 3b, where development is heavily restricted.
Does flood zone 3 mean I cannot get a mortgage or insurance?
Not necessarily, but it does complicate matters. Most mainstream lenders will require a specific flood risk assessment, and buildings insurance premiums can be significantly higher. The Flood Re scheme (a reinsurance arrangement between the government and insurers) provides affordable flood cover for many homes built before 2009 that are in high-risk zones, so insurance is usually still obtainable.
My neighbour flooded but the EA maps show I'm in Zone 1 - why?
The EA flood maps primarily model fluvial (river) and tidal flooding. Surface water flooding - caused by heavy rainfall overwhelming drains - is mapped separately and many homes that flooded in recent years were Zone 1 properties affected by surface water. Our report checks both the main flood map and the separate surface water risk layer.
Does flood risk affect my buildings insurance?
Yes. Insurers use their own proprietary flood scoring models alongside EA data. A property in or near a flood zone will typically see higher premiums. Some properties - particularly those built before 2009 - qualify for the Flood Re scheme, which caps the flood portion of your premium. Properties built after 2009 are excluded from Flood Re.
How often does the Environment Agency update its flood maps?
The Environment Agency updates its flood risk data regularly, typically after significant flood events or new modelling work. Changes to climate projections, upstream land use, and drainage infrastructure can all alter a property's risk designation. Our report queries the live EA API, so you always receive the most current data available.
Is this the same as an official flood search from a solicitor?
No. An official CON29DW drainage and water search or environmental search from a solicitor is a formal legal document that accompanies a conveyancing transaction. Our flood risk check uses the same underlying EA datasets but is an information tool - excellent for due diligence before making an offer, but not a replacement for the formal searches your solicitor will order.
What is historic flood data and why does it matter?
Historic flood data records where flooding has actually occurred, not just where models predict it might. A property could sit in Zone 1 but have a recorded flood event - meaning either the EA model underestimates risk at that location, or localised factors (blocked drains, overwhelmed pumping stations) caused a one-off event. Historic flood records are included in the Full Dossier report.

Check Your Property

Don't buy blind - check flood risk before you offer

Enter an address below and see your free flood risk preview instantly.

Try a postcode (SW1A 2AA) or “12 SW1A 2AA”. Covers England and Wales.

Free preview always available. Full reports from £9.95. Covers England and Wales.

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