Summary of the latest Permitted Development changes - May 30th 2013. 

Changes of Use.

Changes of Use within Business Classes [Part 3, Class B]

Under this change to existing GPDO provisions, the permitted movement between uses is unchanged – i.e. a) from B1 or B2 to B8, and b) from B2 or B8 to B1 - but the maximum floorspace limit has been increased from 235m² to 500m². The other qualifying criteria are unchanged.