Sharing practices are an important part of urban life. This article examines the appropriation of alleys as communal space to understand how sharing practices are embedded in localities, how communal space is constituted and maintained, and how this sustains communal life. In this way,
the article aims to understand the spatial dimension of sharing practices, and the role of communal space in strengthening social relationship networks and urban sustainability. Seowon Maeul and Samdeok Maeul in Seoul are compared in terms of their urban regeneration approaches, community
engagement in planning, street improvement, and the consequences that the transformation had on the appropriation of alleys as communal space. The research findings show that community engagement in planning is as important as the provision of public space if streets are to be appropriated
as communal space. Community engagement has changed residents' perception and use of alleys as a shared resource in the neighbourhood by improving their capacity to act collectively and collaborate with other stakeholders in addressing problems and opportunities in cities.
