Dorset House had space for 800 patients in residence during the 1930s, moving to Bromsgrove during World War II. The building was damaged during the war, so in 1946, the School of Occupational Therapy moved to Oxford, whilst the patients moved to Clevedon. To ensure costs were kept down for the patients, Casson subsidised their treatment from her own funds. She began to release control of the projects in 1948, first by passing the school to a nonprofit company with her as vice-president and remaining as medical director. Then, in 1949, Casson created the Elizabeth Casson Trust which focused on occupational therapy treatment and education, with the majority of funds going to Dorset House school. In 1992, the school became part of Oxford Brookes University; the Elizabeth Casson Trust continues to support occupational therapists in professional development activities, service development and leadership.