An open space assessment is required for major developments that meet the following criteria:
- all major development (10 or more dwellings or 1,000m2 or more) which involve a loss of open space, including playing fields
- all development that includes the loss of all or any part of a playing field
Open space is defined as open space of public value. It is not restricted to land, but can include areas of water such as rivers, lakes, and reservoirs which offer opportunities for sport and recreation or visual amenity.