This paper focuses on the social attachments and detachments of 16- to 29-year-old young adults who are not in employment or education, and consequently not part of the sociability related to work or school. While the characteristics of this group tend to be well documented, there is less empirical research on their social relations. Here, the aim is to explore the interlinkages between young adults’ structural and social marginalisation through an analysis that draws upon two types of interlinked datasets: follow-up surveys and online group discussions conducted among a sample of young adults recruited from targeted youth services during 2017–2018. Leaning on empirical evidence, the paper argues that structural marginalisation is associated with the social marginalisation of young adults. With the use of both quantitative and qualitative data, the paper provides new youth-specific insights into the arguments made in the previous literature on financial constraints and stigma as mechanisms between structural and social marginalisation.