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Environmental Limited| London |
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The Exceptions Test is included (if needed) in our standard
Flood Risk Assessment
report. Please
contact us for a quotation. Our methods
meets with near 100% acceptance.
The Exception Test provides a method
of managing flood risk while still allowing necessary development to
occur. The Exception Test is only appropriate for use when there are
large areas in Flood Zones 2 and 3, “where the Sequential Test alone
cannot deliver acceptable sites, but where some continuing development
is necessary for wider sustainable development reasons, taking into
account the need to avoid social or economic blight”.
The exceptions test should not be seen as a tick box exercise there are opportunities within the test the show that you have thought about how your project will perform in a flood, and how it might help the area it is situated within. As with the Sequential Test the Exceptions Test can make or break a planning application.
Image: Alan Bowring / Usk in full flood, via Wikimedia Commons
Please feel free to contact the office for an informal discussion regarding your requirements.
In practice the exceptions test relates to larger 5 home plus developments, where meaning sustainability measures can be incorporated that will provide "wider" benefits. However, it is generally the case that even a small single unit development the exception test will have to be carried out. Carrying out the exceptions to in the right manner can make or break an application.
The exceptions test for a small site would be conducted as follows.
Wider Sustainability Benefits - "The proposed development increases housing density in the area, which will lead to a reduction in transport related emissions. The development will exceed statutory minima with regards to energy efficiency. In line with the code for sustainable homes provisions are made for home working with a study / office area being provided for each dwelling, again potentially reducing transport related emissions".
If you site is previously developed, which would normally include a back garden then this element of the se2untial test can be deemed as passed.
a) have an adverse effect on a watercourse, floodplain or its flood defenses;
b) would impede access to flood defense and management facilities; or
c) where the cumulative impact of such developments would have a significant
effect on local flood
storage capacity or flood flows.
If it is believed that none of the above will be affected by a development then
you may not need to carry out the exceptions or sequential test.
The below section is written by a machine:
The Exception Test is the second stage of the flood risk planning process, applied only after the Sequential Test has demonstrated that no lower-risk sites are reasonably available. Following the latest National Planning Policy Framework (NPPF) standards, the Exception Test is a mandatory requirement for 'More Vulnerable' developments in Flood Zone 3 and 'Highly Vulnerable' developments in Flood Zone 2. At SWEL, our technical reports maintain a near 100% acceptance rate, providing the rigorous scientific and community evidence needed to secure planning approval.
To pass the first part of the test, it must be demonstrated that the development provides wider sustainability benefits to the community that outweigh the flood risk. This is not a "tick-box" exercise; it requires a strategic audit of how the project improves the local area. Examples we frequently utilize in our reporting include:
The second part of the test requires that a site-specific Flood Risk Assessment (FRA) demonstrates the development will be safe for its lifetime without increasing flood risk elsewhere. This involves technical modeling of climate change impacts and the design of robust mitigation measures. For sites with high-risk or fast-flowing water, this may require a comprehensive Flood Warning and Evacuation Plan (FWEP), identifying safe refuge areas and subscription to statutory warning services. We ensure that your project incorporates flood resilient design, allowing it to be quickly brought back into use following an event.
While minor developments and changes of use are often exempt from the Sequential and Exception Tests, they must still meet the requirements for site-specific FRAs and flood risk reduction. However, if a change of use involves a move to a higher vulnerability classification—such as converting an office to a residential unit in a flood zone—the Exception Test may be triggered. Early integration of these technical requirements into your Planning Statement is critical to avoid project delays or objections from the Environment Agency.
Passing the Exception Test requires a multidisciplinary approach, linking flood modeling with sustainable development policy. With over 900 projects successfully delivered across the UK, SWEL brings the technical authority (IES/CIWEM) required to prove that your project is both necessary and safe. We deliver the "True Data" and professional advocacy needed to move your development from a "high-risk" classification to a planning-approved success.