Expanded state-subsidised housing programmes in middle-income countries raise questions about the displacement and socio-spatial marginalisation of poor households. Examining these questions through people’s experiences of resettlement indicates the importance of mobility to their lives. Drawing on a mixed-method comparative study of Ahmedabad, Chennai and Johannesburg, we ask: How does the relocation of low-income households to urban peripheries reshape the links between their physical and socio-economic mobility, and how does this impact on their ability to build secure urban futures? Experiences of families moving to five peripheral settlements indicate two linked challenges to the social and economic mobility of the peripheralised urban poor: first, their immediate and individual ability to be mobile within the city and second, the longer-term social mobility of their households. While trajectories towards secure urban citizenship for all remain a policy aspiration, housing policies and practices are placing this on hold or even reversing this, with mobility constraints locking many low-income groups into marginality.