From “Housing Security” to “Housing Quality”: The Common Implications of Japan’s UR Rental Housing Experience for China’s Affordable Housing and South Korea’s Public Housing

This study focuses on the commonalities and differences in the public housing systems of three East Asian countries, using Japan’s UR Rental Housing as a case study. It employs a composite methodology that integrates architectural typology and cross-cultural comparison, constructing theoretical linkages within a three-dimensional framework of “social institutions–cultural context–spatial structure”. The research emphasizes three key dimensions: (1) The evolution of policy frameworks and their underlying socio-cultural drivers; (2) The spatial layout logic and functional concepts embedded in residential unit planning; (3) The transformation and inheritance of traditional residential values in contemporary housing design. The study strictly adheres to a progressive logic of “sample construction–type decoding–paradigm extraction–cross-domain comparison–theoretical feedback”. It begins by analyzing the core issues in the supply structure and spatial adaptability of affordable housing in China and South Korea. Next, it systematically examines the policy evolution and spatial design paradigms of Japan’s UR Rental Housing. Subsequently, it constructs a comparative analytical matrix for public housing in China, Japan, and South Korea, identifying transferable common experiences and pathways requiring localized adaptation. Finally, it proposes targeted recommendations across three dimensions, namely policy framework, spatial design, and community building: (1) At the policy level, a full lifecycle governance framework is advocated; (2) In spatial design, the principles of “compactness and efficiency” are emphasized, alongside enhanced flexibility and cultural relevance; (3) In community building, efforts are directed toward activating interpersonal connections and strengthening the social functional attributes of housing. This study emphasizes transnational comparability and knowledge transferability, aiming to provide practical insights for China’s affordable housing reforms and South Korea’s public housing modernization. It seeks to promote cross-national learning and collaborative innovation in the regional housing sector, offering both theoretical reference and practical pathways to realize the shared vision of “restoring housing to a human scale”.