This paper is concerned with the decarbonisation of the UK’s built environments energy infrastructures. Globalised neoliberalism and extractivist interests have blockaded the top-down implementation of an energy transition to renewables. In light of this, bottom-up grassroots movements within the built environment represent an important part of the decarbonisation jigsaw puzzle: they possess the ability to fuel a paradigm shift that moves past the failing reformist, environmentalist approach and toward radical, ecological action. As such, the aim of this paper has been to explore the revolutionary and political potential of current socio-ecological forms of participatory action in the UK. By using an empirical comparative methodology, these different participatory practices were compared to the grassroots movements that sparked the beginning of Germany’s Energiewende. The comparison revealed that they possess the potential to be a socio-political stimulus that catalyses the built environment’s shift from fos