This paper develops connections between design thinking and social practice theories, presenting a toolkit intended to support the development of sustainability interventions and policies capable of encouraging sustainable practices. Key developments in design thinking and social practice theories are critically examined, and a toolkit is presented that sensitively combines their conceptual and methodological insights. The toolkit is one of the first resources that enables practitioners to operationalise social practice theories without substantial prior engagement or training. It thereby offers an accessible resource to support the design of initiatives that could disrupt resource intensive practices and support the emergence and normalisation of less resource intensive alternatives. This paper specifically addresses the contribution the toolkit makes to advancing discussions regarding practice-oriented design.