August 2025 Update to Environment Agency Flood Map for Planning (FMfP)

The key change is the introduction of a new Flood Zones plus climate change map layer. This shows how Flood Zones 2 and 3 could expand over the next 100 years, replacing the more complex rivers and sea with/without defences layers introduced in March 2025. The removed datasets remain available through the Defra Data Services Platform (DSP) for more detailed analysis.

While this update does not identify new areas at risk, it does mean the defended 1 in 30 (3.3% annual probability) layer has gone. That dataset offered valuable insight into defended flooding, whilst also being able to indicate where land could be located in Flood Zone 3b. A key flood zone designation when considering new development.  Its removal makes it harder to see where flood defences provide protection, especially in places like London. 

As a result, understanding flood risk now relies more on review of Strategic Flood Risk Assessments (SFRAs), interactive local plans, or specialist support such as Aegaea. Some SFRAs may lack detailed information on functional floodplain, so engagement with the EA or a specialist consultant will need to be undertaken to reference datasets such as the present-day 3.3% annual probability and water storage areas.

Although the Environment Agency aims to simplify how flood risk is presented, key detail can be lost. That is why early engagement with specialists remains essential.

At Aegaea, we can help you navigate these changes. Our FloodMetric site screening tool and consultancy support provide clarity on whether a site sits in present-day Flood Zones 2 or 3, or only within the climate change extent. This understanding can prevent unnecessary risk and costly delays.

Always check the relevant SFRA and Planning Practice Guidance on flood risk and coastal change. If you are unsure, our team can provide the evidence and advice you need to move forward with confidence.

The EA’s guidance is that the new layer should be used straight away.

• Live planning applications are not affected, as the update does not change flood risk itself – only how it is displayed.
• Developers and consultants using GIS tools should update their feeds to include the new layer as soon as it becomes available.

The TCPA have also linked a diagram explaining the suitability of the Environment Agency’s new flood risk products for development planning.

• Green – suitable for use.
• Yellow – may be relevant to inform assessments, but additional information is usually needed.
• Red – unsuitable for use.

The August 2025 update represents another step forward in the EA’s ambition to provide clearer, more accessible flood risk information. For planners, architects, and developers, the “Flood Zones plus climate change” layer will make it simpler to identify potential risks early – helping avoid costly design changes later in the planning process.

However, this new layer does not replace the need for site-specific flood risk assessments. Local data, detailed modelling, and professional interpretation remain essential to ensuring proposals meet planning requirements.

At Aegaea, our team of flood risk consultants can help you interpret the updated Flood Map for Planning, assess your site’s exposure to climate change, and prepare robust evidence to support planning applications. If you’re working on a project that may be affected by these changes, get in touch today to discuss how we can help.