In this study, the townhouses in the historical district of Kiso-Hirasawa, Nagano, Japan, were classified according to their rooms’ configuration and kitchen location. They have tori-doma (earthen floor), and the rooms are usually arranged in the order of mise, okatte (kitchen), and zashiki. In modern times, however, the kitchen is often built in the back. Looking at the distribution of typologies, we can see that while many traditional typologies remain in Nakamachi, modern ones are found in other areas. This analysis by architectural typology is an effective means for observing the transformation of urban spaces.