The facility was designed by Tibor Donner (then in the NZ Public Works Department) and was built by Fletcher Construction. The Department of Education had some of the site planned for a new secondary school to cope with the overcrowding of Auckland secondary schools. The hospital was given first priority, but a small portion of the buildings were built in permanent materials so that the wards, the gymnasium, the hall and some other buildings could be converted into a school at the end of the war. The extent of the hospital was huge, taking up all of the present school site as well as the nearby Rosebank Park and fields.