Local Planning Authorities are now guided to apply affordable housing contributions only on the net increase in floorspace.
Runnymede BC will therefore apply the 40% Local Plan requirement to the total number of residential units proposed and then reduce that requirement by a percentage equivalent to the percentage increase of floorspace (GIA). E.g. If 75% of the proposed floorspace is already existing (as vacant buildings) then only 25% of the Local Plan derived calculated affordable housing provision will be sought.
Planning Permission is sought for a development of 200 houses, with a proposed floorspace of 30,000 sqm on a site currently occupied by 10,000 sqm of vacant buildings.
The Runnymede Local Plan requires 40% of new houses on this site to be Affordable, ie. a provision of 80 units.
33.33% (10,000sqm) of the proposed floorspace (30,000 sqm) is already existing (as vacant buildings) and therefore only 66.66% of the provision (80) will be sought. Therefore the requirement of affordable housing would be 66.66% of 80, 53 affordable units.