This paper assesses the effects on suburbia of an energy transition to less carbon- or petroleum-intensive energy urban forms using a socio-technical theoretical perspective. The paper argues that while suburbia is the predominant form of urbanisation in advanced nations, especially North America and Australia, its socio-technical composition is insufficiently understood by urban scholars. Using a socio-technical theoretical perspective, the paper argues that suburbia should be seen a complex 'assemblage' that is configured through socio-material relations of land use, transport technology, energy and money credit. This system is also differentiated by social status and infrastructure access deficits. The paper argues that suburbia faces a number of socio-technical challenges from an energy transition principally due to heavy mobility reliance on motor vehicles. The paper sets out some potential trajectories of transformation for suburbia under an energy transition.