ENHousing modernization played one of the most important roles in the modernization processes of interwar European cities. In this context, the development of housing in Vilnius, which belonged to Poland in 1919–1939, is researched. The research is based on the theory of “housing-based urban planning” developed by Yael Allweil and Noa Zemer. This theory conceives urban structure and urban housing as one single problem rather than disconnected realms of planning. Based on new findings and revised study of available sources, three planning processes by which policy makers, planners, and dwellers in Vilnius (Wilno) engaged in this housing-based urban vision are investigated: (1) the city as a housing problem; (2) the city as social utility for reform and reconstruction; and (3) housing-based urbanisation as self-help. The result is a new historiographic perspective on Vilnius’ modern urbanism focusing on the planning and construction of new housing. Keywords: greater Vilnius plan, housing-based urban planning, Jerzy Kobzakowski, modern housing, Vilnius 1919–1939. [From the publication]