Drainage requirements

There are extra drainage requirements for major projects involving either:

• 10 or more properties
• 1,000 square metres of non-residential floor space

We require these projects to include plans for Sustainable Urban Drainage Systems (SuDS). Effective SuDS manage surface water drainage and run-off. Your plans must show:

• how and where you will build SuDS
• how you will maintain SuDS

To meet drainage requirements, submit a Surface Water Drainage form with your application.

Download a Surface Water Drainage form (PDF, 622 KB)

You can find more information about drainage requirements here:

• Surface Water Advice Note (PDF, 260 KB)
• Validation checklist (PDF, 70 KB)
• The Ministerial statement for Sustainable Drainage Systems (opens new window)
• Government guidance for dealing with flood risks (opens new window)