Understanding and assessing flood risk
Check the development class
Major development involves one or more of the following:
- providing 10 or more dwellings or, where the number of dwellings is not known, the site area is 0.5 hectares or more
- providing a building or buildings where the floor space to be created by the development will be 1,000 square metres or more
- development on a site of 1 hectare or more
- the winning and working of minerals or the use of land for mineral-working deposits
- waste development
A minor development is:
- development of an existing dwelling, or development within the curtilage of a dwelling, for any purpose incidental to the enjoyment of the dwelling
- an extension to an existing building used for non-domestic purposes where the floor space created by the development does not exceed 250 square metres
- alterations to an existing building which do not increase the size of the building
Non-major development is any development not falling into the major or minor development classes.