Agile working (flexibility about where and when practitioners do their work) is increasingly common across public sector social work, but there has been little research about how practitioners engage with it or its impacts on communication between social workers, their colleagues and the families with whom they work. This article presents findings from an ethnographic study of a children’s safeguarding social work team in an English local authority who were engaged in agile working. It draws on data from observations, local authority documents, semi-structured interviews, participant research diaries, participants’ photographs and the researcher’s photographs taken during fieldwork. An analytical frame drawing on Henri Lefebvre’s concept of spatial dialectics and Wanda Orlikowski’s concept of sociomateriality is used to identify how agile working involves entanglements of practitioners and families with restructured office spaces, digital information systems and mobile devices such as convertible laptop–tablet computers and mobile phones. Innovations such as these are commonly understood as promoting more effective and transparent social work practice, but the study’s data show that entanglements between workspaces, digital devices and people in practice are having multiple effects, producing new hierarchies of belonging in space, shaping what can be communicated, and the ways it can be presented and received. The article argues for critical attention to the role of material space in digital and place-based innovations in social work practice.