Apartment houses in Japan now face many serious problems. Japanese society is aging, resulting in 1 or 2 elderly people
now living in houses built for larger households consisting of 3 or more people. This has distorted the structure of
the population residing in apartments, so they do not function as district communities. To ensure the future effective utilization
of our housing stock, we must tackle one fundamental challenge, namely developing methods of flexibly
upgrading the existing housing stock to respond to change of the makeup of the population of regional societies and
to changing life styles. Housing production and supply systems that enable residents to personally plan and decide
specifications must be introduced to establish infill upgrading as an effectively functioning part of the future housing
Keywords: Infill Renovation, Occupancy, Sustainability, Urban Housing.
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