The amount of old apartment complexes are increasing rapidly by supplying large quantity of their construction since mid-1980s. By growing number of old apartment complexes that need to be remodeled, not only studies about this issue are necessary, but a study about parking area issue in the old apartment complexes is also necessary for its importance and practical point. The purpose of this research is to be available as a basic material for parking area expansion plan. Through a couple of completed cases, we confirmed the characters of parking area expansion plan and find factor from the cases. After that we revised the factors through some of uncompleted cases. A result through the analysis, simply we divided by inner factor and outer factor, and classified by its items. Inner factors are present land condition and requirements of the inhabitants. Outer factors are economical efficiency and architectural building codes.