In a built-up houses area in a large cities, site partition, high rising, high density of buildings and so on have brought about through renewal of housing and reorganization is on-going. The purpose of this study is to grasp built-up houses area in view of building use based on block unit, and laslly to suggest what to do for improvement of dwelling area. As the research method, we classify dwelling area from view of building use, and find relation between its classifications and factors such as locational conditions, laws and regulations, and so on. In conclusion : the purpose of use zone in force isn't reflected on what built-up houses areas are in terms of land and building use. In the near future, categories of use zone will be detailed much more, but it is still neccessary to consider locational conditions and form of buildings in view of group unit and include them to regulation and guidance for preservative improvement in built-up housing area.
