The discover in our first thesis was that the size of lot frontage had been converging to 5.4 meters (3 "Ken" as to housing frontage) in historically built-up areas. The conclusions in our last thesis was that there were four typical housing plan types in historically built-up area and that the size of frontage was decided by the combination of passage space and living space in housing plan, and that it was 3 Ken (5.4 meters) size that had been meeting for the minimum demand for passage and living space. This paper deals with the position of eguipment space on each typical housing plan type. The conclusions are as follows, that is, each equipment such as toiletroom, kitchen and bathroom has its inherent position on housing plan. And their positions are prescribed by frontage size by typical housing plan type. So, by frontaqe size, forms of typical housing plan types are described, its containing the passage space, living space and equipment space.