Objective This study aimed to evaluate the effectiveness of evidenced‐based psychological treatments (specifically, Cognitive‐Behaviour Therapy for Eating Disorders CBT‐ED and Maudsley Anorexia Nervosa Treatment for Adults MANTRA) for a transdiagnostic eating disorder population in a routine clinical setting. In particular, it aimed to determine the extent to which treatment was provided in line with current clinical guidelines (NICE, 2017) and how effective treatment was in improving eating disorder and general psychopathology. Method Three hundred and seventy‐nine participants meeting criteria for DSM‐5 anorexia nervosa, bulimia nervosa, binge‐eating disorder or other specified feeding or eating disorder completed pre‐ and posttreatment measures of eating disorder pathology and general distress. Clinicians recorded weight and episodes of bingeing and purging. Results Ninety seven percent of participants received treatment in line with evidence‐based psychotherapies. Treatment was completed by 59.9% of the whole sample. Using stringent criteria and ITT analysis 21.4% met criteria for remission at end of treatment. In the underweight sample, there was a significant increase in BMI, averaging 1.38 kg/m2 over treatment, with similar outcomes for MANTRA and CBT‐ED. Discussion These findings, in a large transdiagnostic population, add to emerging literature on the translation of evidence‐based psychotherapies to real‐world clinical settings. Our results converge well with prior similar studies. Findings highlight the need for routine data collection in services and for the ongoing improvement of treatments for the eating disorders.