A 26-item Resident Choice Scale was designed to assess service practices for promoting resident choice. The staff working with 560 UK-Irish adults with intellectual disability were interviewed. Specific examples of practices promoting resident choice were requested and independently rated by the interviewer. The interrater reliability of Resident Choice items was found to be acceptable (subsample n=50). The psychometric properties of the Resident Choice Scale total score and scores on eight subscales were also acceptable. Consistently strong associations were found between greater resident choice and greater resident ability and, to a lesser extent, fewer resident challenging behaviours. Few associations were found between resident choice and autism or mental health problems. Even when controlling for resident ability and challenging behaviour, consistent associations were found between greater resident choice and the concurrent variables of greater community presence, fewer institutional practices, and greater user self-reported satisfaction (subsample n=50). Taken together, this pattern of results indicates that the Resident Choice Scale shows promise as a measure of the environmental opportunities available for adults with intellectual disability to exercise self-determination. Areas for future research testing the reliability and validity of the Resident Choice Scale are outlined.