a b s t r a c t Though the concept of sustainable development originally included a clear social mandate, for two dec-ades this human dimension has been neglected amidst abbreviated references to sustainability that have focused on bio-physical environmental issues, or been subsumed within a discourse that conflated 'devel-opment' and 'economic growth'. The widespread failure of this approach to generate meaningful change has led to renewed interest in the concept of 'social sustainability' and aspects thereof. A review of the literature suggests, however, that it is a concept in chaos, and we argue that this severely compromises its importance and utility. The purpose of this paper is to examine this diverse literature so as to clarify what might be meant by the term social sustainability and highlight different ways in which it contrib-utes to sustainable development more generally. We present a threefold schema comprising: (a) 'devel-opment sustainability' addressing basic needs, the creation of social capital, justice and so on; (b) 'bridge sustainability' concerning changes in behaviour so as to achieve bio-physical environmental goals and; (c) 'maintenance sustainability' referring to the preservation – or what can be sustained – of socio-cultural characteristics in the face of change, and the ways in which people actively embrace or resist those changes. We use this tripartite of social sustainabilities to explore ways in which contradictions and complements between them impede or promote sustainable development, and draw upon housing in urban areas as a means of explicating these ideas.