The postponement of partnership formation and parenthood in the context of an early average age at leaving home has resulted in increased heterogeneity in the living arrangements of young adults in the UK. More young adults now remain in the parental home, or live independently of the parental home but outside of a family. The extent to which these trends are explained by the increased immigration of foreign-born young adults, the expansion in higher education, and the increased economic insecurity faced by young adults are examined. Shared non-family living is particularly prominent among those with experience of higher education, whilst labour market uncertainty is associated with an extended period of co-residence with parents.