Sustainable Drainage Systems (SuDS): guidance for developers

Last updated: 12 December 2022

What to provide as part of a change of use planning application

As part of a change of use planning application, you will need to provide:

  • a flood risk assessment
  • a surface water drainage strategy

The list is not exhaustive, the Lead Local Flood Authority may request additional information depending on site-specific conditions.

Read more about change of use planning applications on the Planning Portal.

Flood risk assessment

You will need to provide a flood risk assessment as part of a change of use application if the criteria in footnote 55 of the National Planning Policy Framework are met.

You will need to:

a. Include surface water, groundwater, fluvial, reservoir, sewer and any artificial waterbodies (e.g. canals).

b. Consider how flood risk may change in the future such as climate change.

c. Apply Sequential Test and Exception Test (if criteria met).

d. Demonstrate a sequential approach to locating a development.

e. Include mitigation measures.

Surface water drainage strategy

As part of a surface water drainage strategy, you will need to include:

a. Evidence of the existing drainage (photographic evidence, deeds detailing drainage or other records).

b. Location of the existing component in relation to the proposed development.

c. Capacity and condition assessment, details of any necessary updating works must be provided.