Multi-scalar, integrated and transformational solutions are necessary to address the complex problems of climate change and sustainable development. Cities are using urban living labs to develop and test such solutions; however, the pace of transformation does not yet match the urgency of the problems at hand. In business, accelerators are used to advance new and potentially transformational enterprises, giving fresh ideas an advantage over more established competition, thereby accelerating the pace of change. This article examines the accelerator model and considers its adaptation to urban living labs. From the literature, a multi-scalar business accelerator model is proposed that addresses both individual and system interventions to advance sustainability transformations. Also proposed is a formative-evaluation framework to guide effective implementation of the accelerator model. This article concludes with recommendations for scholars and practitioners working on urban living labs to utilize business accelerators to advance sustainability transformations.