The former building of Denpodo was built in the style of tsuma-iri (entrance in the side of tsuma (the gable pediment or the gable side a building with a gable roof)), and its planar structure consisted of the main room of 5.4 m depth and 7.2 m wide surrendered by walls and doors, the open space of 3.6 m depth and 7.2 m wide, and the broad sunokojiki (a slatted floor or duckboard floor made of boards or bamboo laid parallel) leading to the open space.
伝法堂の前身建物は妻入り（屋根の妻側を正面とする）で、平面構造は、桁行（奥行）三間、梁行（幅）四間の壁と扉で閉ざされた主室部分と、桁行二間梁行四間の開放的部分とそれにつづく広い簀子（すのこ）敷から構成されている。