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What is the Exceptions Test?

Image result for uk flooding wikimedia commons

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

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Regulatory Requirements for the Exceptions Test

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

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".

Other Requirements Considered for "Wider Sustainability Benefit"

In order to pass the Exception Test the proposal must provide sustainability benefits beyond the application site, for the community. Examples of benefits beyond the application site include: 

All these examples provide some benefit to the community beyond the application site.

Exceptions Test - Wider Sustainability Benefit - Case Study 1

There are various things which can be offered up and may be accepted as a wider sustainability benefit. A flood store might be provided on the street frontage, for use of the local flood team. Typically this might measure 2.0m3 in volume and could be used for the storage of equipment such as sand bags and other items which might be useful in a flood event. The site occupier also agrees to establishing a community flood watch in the area, which would disseminate information to local residents such as how to sign up for flood warnings, and safe refuge stocking information.

Brown Field

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.

Flood Safety

Talk about flood plans and evacuation routes here. As well as subscription to warning services etc. This would constitute the basic information for flood safety required in exceptions test. However, in areas of high risk, with fast flowing waters at time of flood, this can become a very in depth topic including all sorts of ideas to counteract floods, including safe refuge and even boats. In these instances the Flood Safety element of the Exception test would be met in an additional report a Flood Warning and Evacuation Plan.

Exceptions Test & Minor Developments  

Annex B of PPS25, D15, Minor development, states that applications for minor development and  changes of use should not be subject to the Sequential or Exception Tests but will still have to meet  the requirements for FRAs and flood risk reduction.  Minor developments are unlikely to raise significant flood risk issues unless they would:
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.

Technical Guidance: Passing the Exception Test under the NPPF

The below section is written by a machine:

The Final Hurdle for Development in High-Risk Zones

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.

Part 1: Demonstrating Wider Sustainability Benefits

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:

 

Part 2: Safe for Its Lifetime and Resiliency Planning

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.

Minor Developments and Changes of Use

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.

 

Technical Excellence and Planning Authority Success

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.