A Global Survey of Building Energy Efficiency Policies in Cities is a resource for city officials around the world as they design new policies for building energy efficiency, or review existing ones. The research should help close the evidence gap regarding city-level activity in building energy efficiency. As such, it is designed to be accessible to those working in the field in general, including researchers. The Urban Efficiency report’s specific objectives are: to begin to capture the range of different policies being implemented in cities around the world; to obtain detailed information on the necessary conditions, opportunities and potential challenges when introducing and implementing such initiatives; and to analyse what approaches have been successful in which context and why. This research is not an exhaustive study of all cities promoting building energy efficiency policies. Instead, it focuses on a readily available selection of pioneering cities that are active members of the C40 Cities Climate Leadership Group’s Private Building Efficiency Network.C40 is a unique coalition of large cities around the world committed to addressing climate change locally and globally. Within the C40 are smaller working groups – or networks – of cities focused on specific topics.