Casson moved control of the school to a non-profit company in 1948, remaining as vice-chairman and medical director. She created the Elizabeth Casson Trust in 1949, intended to improve occupation therapy education and treatment. In 1951, Casson was awarded an OBE for her work at Dorset House and was also made an honorary fellow of the World Federation of Occupational Therapists. A memorial lecture was set up in her name in 1973 with presenters being selected by their peers, and a psychiatric unit was named after her at Bristol's Callington Road Hospital.