Part Harperbury hospital opened in 1928 converted from a few aircraft hangars, aimed to care for children and adults with learning difficulties and epileptics, and evolved towards mental conditions treatment. The evolution of policies concerning these problems lead from 1973 to a progressive closure of the buildings.
Through the years the abandoned buildings were sacked and vandalized. A part of the buildings is still used as a mental care institution by the National Health Service, but the British Department of Health, as a part of a program that covers all the national Departments, has identified the property as for sale. A position near the M-25, the large outer London beltway, the 94 hectares including farmland (the largest NHS land for sale) and an estimated housing units capacity of 225-400 are interesting elements for eventual buyers, with an estimated disposal date in 2013-2014.