Youth in out-of-home care are an extremely vulnerable population subject to disproportionate negative outcomes. Few interventions have been identified as being effective in supporting this population in transition from out-of home care to independent living. At the start of this project there were no interventions delivered in Sweden designed to support youth in their transition from out-of-home care to independent living. Although standards for effectiveness guide stakeholders interested in disseminating and scaling up interventions in practice to implement interventions with fidelity, there is growing evidence that adapting interventions when transferring them between contexts or developing interventions within the context in which they will be implemented may be more effective strategies than straight adoption. This may be due to the adaptation process’s impact on perceived acceptability and appropriateness among professionals that will be delivering the intervention in its new setting. Ethical practice is concerned with acceptable and appropriate behavior based on the values and norms of the profession as well as the values and norms of client groups. From a practice perspective, interventions and their components that are approved of and accepted by the professionals that will deliver them and the youth that will participate in them can be understood as at least in part more ethical than interventions which are not approved of or perceived as accepted by these groups. The aim of this project is to develop an effective and ethical intervention to support youth in out-of-home care transition to independent living through a co-creation process with practitioners. We use an open source, evidence-based implementation framework, Getting to Outcomes , to guide our work. We present the development process and preliminary results from a pilot study with focus on acceptability, appropriateness, and feasibility from a practitioner and youth perspective. We present how these results led to refinement of the intervention.