Brownfield land registers will provide up-to-date and consistent information on sites that local authorities consider to be appropriate for residential development having regard to the criteria set out in regulation 4 of the Town and Country Planning (Brownfield Land Register) Regulations 2017. Local planning authorities will be able to trigger a grant of permission in principle for residential development for sites in their registers where they follow the required procedures. Registers will be in two parts, Part 1 will comprise all brownfield sites appropriate for residential development and Part 2 those sites granted permission in principle. Registers should be published locally as open data and will provide transparent information about suitable and available sites.