Post-war housing projects are increasingly connected to discussions about how to renovate, renew and reconnect modernist urban areas in the city in sustainable, resilient and just ways. The stigma and polarized perceptions of large social housing areas from the 1960s and 1970s in the public debate call for more nuanced understandings. This, we argue, should involve a closer understanding of their histories, present situations and future scenarios. Focusing on examples from Denmark and Sweden, two countries often associated with a strong welfare state system, the articles in this volume are concerned with the dynamic histories of mass housing, including their contemporary everyday cultures, materialities and future reconfiguration.