Self-admission is a novel treatment tool whereby patients who are well-known to a service who have high previous utilization of health care are offered the possibility of self-admission to the inpatient ward for up to seven days without having their motive for admission questioned. Patients are free to admit themselves because of deteriorating mental health, acute stress, lack of structure in their everyday life, loneliness, boredom, or any other reason. The patients decide when they want to admit themselves and can discharge themselves at any time. The purpose behind the self-admission model is to increase the availability of inpatient care for severely ill patients, to avoid stressful and possibly destructive visits to the emergency service, and to decrease total inpatient care utilization. Patients offered a contract for self-admission usually have a history of repeated and prolonged hospitalizations. By encouraging them to monitor their own mental health status and allowing them to seek help swiftly when they are feeling poorly, the delay from first signs of deterioration to admission can be minimized and full-blown relapse can be avoided, ultimately reducing the total time spent in hospital. Until now, projects of self-admission have mainly targeted patients with long-standing psychotic disorders, such as schizophrenia, or bipolar disorder. Starting in August 2014, a four-year clinical project at the Stockholm Centre for Eating Disorders began offering self-admission to patients with severe and enduring eating disorders. The purpose of this study is to determine whether this model is viable in a specialized eating disorders treatment setting, if it does lead to increased patient participation and agency and a reduction of the total time spent hospitalized for this particular patient group, and if it is cost-effective.