Flood Risk Map & Property Checker
Search a specific property, plot or site on Maplify to assess its flood risk in one pass. View flood zones, surface water probability and historic flooding for that exact location, alongside boundaries and planning constraints, before you buy, sell or submit a planning application.
Editorial review
Reviewed by the Maplify Editorial Team. Editorial policy
Primary source
Verification
Last checked September 2026. Methodology · Corrections
Check flood risk by postcode or address
Search a property or site to open flood zones, surface water risk, historic flooding and flood-defence context on the Maplify map.
Maplify is a screening and due-diligence tool. Verify critical planning, legal and environmental matters with the relevant authority or qualified professional.
What Does a Property Flood Risk Check Involve?
A flood risk check for a specific site means looking at every flood-related layer that touches that exact boundary, not just the headline flood zone. A property can sit outside Flood Zone 3 and still carry meaningful surface water risk, or sit next to a flood defence that reduces but does not remove risk. Checking a site properly means combining these layers rather than reading one in isolation.
What the Site Check Covers
Flood Zone Classification
Whether the site, or any part of it, falls within Flood Zone 1, 2 or 3, and therefore whether planning applications will require a Sequential Test, Exception Test or Flood Risk Assessment.
Surface Water and Historic Flooding
Surface water risk category for the exact plot, plus whether the historic flood map records the site or its immediate surroundings as having flooded previously.
Defences and Residual Risk
Whether the site benefits from a formal flood defence, and therefore carries residual risk if that defence were overtopped or to fail — a distinction that matters for insurance and long-term risk, not just planning.
How to Check Flood Risk for a Site
- 1
Search the exact property address, postcode or plot on Maplify.
- 2
Zoom to property boundary level for an accurate reading.
- 3
Enable Flood Zone 2 and 3, surface water and historic flood layers together.
- 4
Click directly on the boundary to see which categories apply to that plot specifically.
- 5
Check whether the site benefits from a mapped flood defence.
- 6
Add planning constraints or ownership layers if this is a purchase or development check.
- 7
Save the site if you need to return to it or share it with a colleague.
Worked Example
A semi-detached house being purchased on a river-adjacent street shows the following once every layer is checked for its exact boundary:
- The property itself sits in Flood Zone 1 — outside the main river flood zones.
- A medium surface water risk band clips the rear garden, relevant to drainage and any extension plans.
- The historic flood map shows the street flooded once in the last 20 years, from surface water rather than the river.
- No formal flood defence covers the property, so the surface water risk is not offset by any protective structure.
Data Source, Coverage and Updates
Important Limitations
- This check screens a site against published flood data — it is not a Flood Risk Assessment and does not replace one for planning purposes.
- A clear result does not guarantee a property will never flood; local drainage conditions can differ from modelled data.
- Flood defence coverage reduces but does not eliminate risk.
- Insurance availability and pricing should be confirmed directly with insurers, ideally before exchange of contracts.
- For planning applications in Flood Zone 2 or 3, commission a Flood Risk Assessment from a qualified engineer.
Combine This Layer With
A flood check is usually one part of a wider due diligence process.
Frequently Asked Questions
How do I check flood risk for a specific property?
Search the property address or postcode on Maplify, then enable the flood zone and surface water layers. Click directly on the property boundary to see which flood classifications apply to that exact site.
What should I check alongside flood zones for a single site?
For a property-level assessment, also check the historic flood map, flood defences, surface water risk and, if relevant, the reservoir flood extent — a site can carry more than one type of flood risk at once.
Will this tell me if I need a Flood Risk Assessment?
It will tell you which flood zones and surface water categories apply to the site, which is the first indicator. If any part of the site falls in Flood Zone 2 or 3, a planning application will normally require a professional Flood Risk Assessment.
Can I check flood risk before exchanging on a property?
Yes — this is a common use case. Checking flood risk before exchange gives you time to obtain insurance quotes and raise questions with the seller or conveyancer if risk is identified.
Does flood risk automatically affect my insurance or mortgage?
It can. Properties in higher flood risk categories may face higher premiums or, for older residential properties, be eligible for the Flood Re scheme. Mortgage lenders may request further information where uninsurable risk is identified.
What is the difference between this page and the general Flood Risk Map?
This page is built around assessing one specific site — search once, check every relevant layer for that plot. The Flood Risk Map is for browsing and comparing flood data more broadly across an area.
Check Your Property on Maplify
Search the exact address or plot to see every flood-related layer that applies to it.