This special issue addresses the questions of gentrification and new‐build gentrification, two processes of urban transformation that significantly contribute to the reconfiguration of the socio‐demographic profile of populations in contemporary cities. Whereas gentrification has long referred to the physical and social transformation of central areas through rehabilitation of existing housing stock and population displacement by more affluent households, the concept has recently been extended to include new high‐status developments (regeneration of brownfield sites or demolition/reconstruction of existing residential areas). Although these new developments do not always cause direct population displacement, the question of the possible indirect consequences has been critically raised while the densification of the built environment appears as a favourable outcome in a context of environmental sustainability concerns. The papers collected in this issue focus on the emerging debates surrounding the new forms of gentrification, the increased residential attractiveness of core cities, and the actors who are involved or affected by these processes. In so doing it discusses the geography of gentrification, expanding analysis towards a wide range of contexts. Copyright © 2009 John Wiley & Sons, Ltd.