Background and Aims: Self-determination related skills are central for achieving a life of quality for people with intellectual disability and develop as the person interacts with his/her contexts, such as home. As such, families are crucial agents in supporting the self-determination of their children with intellectual disability, although to date, little is known about how to support those families. Methods: To address this need, the present study used a Delphi technique to build and reach a consensus on the critical components that should inform interventions targeting families to promote their children's self-determination. Results: Academics and professionals participated in this three-round Delphi study that concluded with a 90-item list of critical components for intervention, concretely relating to general principles, format, content, and methodology. Conclusions: This knowledge has the potential to guide emergent intervention initiatives to support families in fostering their children's self-determination. Implications for research and practice fields are provided and discussed.