Society, Sustainability and Planning promotes a novel understanding of how to transform the built environment in collaboration with its users. The master pays attention to the social, cultural, political, and economic environment in which decision-making on spatial interventions takes place.The emergence of self-organizing citizen collectives is a critical change in today's societal strive for sustainable places and futures. SSP emphasizes the role of citizens in shaping places. We interrogate why different stakeholders and social groups embrace, contest, or reject spatial changes, and how we can design their surroundings in such a way that it meets their diverse needs. We present spatial justice is a leading principle to design cities of the future. Moreover, we pay explicit attention to the ways in which spatial planning can contribute to achieving the UN’s sustainable development goals, such as healthy ageing, a clean environment, and eliminating poverty, in collaboration with citizens and civil society actors.