Reducing and eliminating seclusion and restraint in inpatient settings has been a key area of focus in mental health policy and research for many years. To address this issue, numerous programmes aimed at minimising the use of these practices have been developed over the past two decades, with varying degrees of success. This article reports on research focused on the implementation of a localised, multilevel complex intervention that targeted both organisational and individual factors related to the use of seclusion and restraint. The researchers followed the impact of the intervention by interviewing medical, nursing and allied health staff who worked within the service (N = 12) and analysing the rates of seclusion and restraint over an 18-month period. Post-adoption, participants identified that there were clear changes in practice culture. Seclusion clearly became a practice of last resort and other options became prominent in staff's practice. Participants identified that there was a sense of shared purpose across the multidisciplinary team. The clinical environment was viewed as being more therapeutic for service users and less frightening for staff. There was a significant difference in the total number of seclusion events between pre- (Mean = 6.22, SD = 5.82) and post-implementation (Mean = 2.55, SD = 2.44, p = 0.002, d = 0.94), demonstrating a significantly lower number of seclusions was observed after the intervention. Similarly, a significant difference in restraint events between pre- (Mean = 5.50, SD = 3.77) and post-implementations (Mean = 3.38, SD = 3.21, p = 0.037, d = 0.62) was observed.