Allowing for overlaps, just over 40% of the area of England (5.6 million hectares) is protected against development by one or more environmentally-protected designations. The extent of the designated Green Belt in England, as at 31 March 2019, was estimated at around 12.4% of the land area of England. Trends between 2013 and 2014 and 2018 and 2019 show a 1.1% loss of Green Belt land in England, this is partly due to local authorities adopting new plans in 2018 and 2019. Extent of Green Belt as at 31 March 2019 Source:
Local Planning Authority Green Belt: England 2018/19, Ministry of Housing, Communities and Local Government, October 2019