This article explores the institutional and socio-economic dimensions of social isolation among internally displaced persons (IDPs) in rural territorial communities (rural hromadas) of Ukraine during 2022–2023. Framed by historical institutionalism and the social capital/integration literature, the analysis draws on focus group discussions with IDPs in rural western Ukraine. It identifies key causes of isolation, including cultural differences, infrastructural challenges, and institutional dysfunctions such as communication gaps, lack of employment opportunities, and opaque access to documents and services within thin service networks. The article reveals how IDPs often face subtle forms of exclusion despite the absence of direct hostility, contributing to a decline in human and social capital in host communities. We argue for an integrated approach that includes closing the communication vacuum, strengthening community engagement through local initiatives, and launching joint educational programs for IDPs and residents. We also emphasise participatory mechanisms, digital inclusion initiatives, and low-cost community-building activities. These measures are crucial for preventing the long-term institutionalization of social isolation during recovery and reconstruction and for enabling the successful integration of IDPs into the social and economic life of rural Ukraine. In policy terms, linking and bridging ties - together with dependable institutional access - emerge as practical levers to reduce isolation and support rural recovery.