There are new measures to speed up development of derelict and under-used land:

• Local authorities now have to produce and maintain up-to-date, publicly available, registers of brownfield sites available for housing locally;

• permission in principle is a new consent route that will sit alongside existing routes for obtaining planning permission, establishing the use, location and amount of housing-led development.

Secondary legislation introducing the brownfield registers requirement and providing for permission in principle on sites allocated in brownfield registers is now in force.

Prior to the election announcement, the government was intending to publish guidance by June 2017, with further legislation to roll out permission in principle more widely promised for this year.

See: https://www.gov.uk/government/news/ new-measures-to-unlock-brownfield-land-forthousands-of-homes