The space of a dwelling unit in Kyu(9)shaku-ni(2)ken-no nagaya was roughly equal to that of a six-tatami-mat room, and generally the space corresponding to approximately 1.5-tatami mats was used for the earthen floor and the remaining 4.5-tatami-mat space was used for the room.
九尺二間の長屋とは畳6畳の部屋とほぼ同規模の大きさでありそのうち約1畳半を土間として、4畳半を部屋として区画されているのが一般的。