The Town and Country Planning (Brownfield Land Register) Regulations 2017 and the Town and Country Planning (Permission in Principle) Order 2017 require all local planning authorities in England to prepare and maintain registers of brownfield land that is suitable for residential development. The sites included in this register need to be available for development in the next 10 years, capable of development (any problems can be mitigated), over 0.2 hectares and be 'predominantly brownfield'.