This one-day workshop explores how encounters with regulatory aspects, before, during and after design, can shape the production of more sustainable futures. Within CSCW and Sustainable HCI, there have been repeated calls to develop more systemic approaches to design that include the political, institutional, and infrastructural aspects underpinning technology-mediated interventions towards sustainability. This workshop targets these calls by drawing attention to the methodological, analytical, and design challenges of considering regulatory and policy-making aspects that can shape both the design and the processes of designing digital technologies. It will be an opportunity to bring together CSCW, Sustainability, Law and other interested scholars, representatives of public institutions, environmental collectives, and diverse actors interested in investigating the "knots" of relations between technology designs, regulatory aspects, and sustainable practices. We plan to accept up to twenty contributions and run the workshop on-site.