ABSTRACT Urban designers have considerable potential to take important climate change actions in the built environment. Based on interviews with urban designers across Australia, it was found that the main actions taken were: development and use of policies and strategies; education and research; appropriate project designs; reduction of carbon footprints; advocacy and lobbying; the use of sustainability measures and ratings; and taking on projects oriented to climate change action. Key facilitators of these actions that overcame barriers were strong leadership, establishment of targets and measures, effective regulation, financial and other incentives, and access to trustworthy, practical information.