Hanoi’s ‘collective housing quarters’ (KTTs) are a living legacy of its socialist past. Since the 2000s the state has set out radical redevelopment plans to transform KTTs into new buildings, but these have largely failed. What are the possible explanations for this failure? KTTs have gradually transformed in their material forms through self-built modifications initiated by residents. Such material property of KTTs bears on the pathway of redevelopment, but official discourses are silent about this. In this article I show how KTTs as things have the capacity to transform anthropological thinking. The material property of KTTs as a citywide phenomenon affords a particular scale of analysis, with which we can imagine humans as participants in the material world instead of viewing materialities as participants in society.