The thatch used on the roof must be replaced every ten years, as leaks occur if it is damaged. The old thatch after replacement was reused, such as by spreading it in fields, as a nationwide example. Laying old thatch on fields is said to have benefits such as winter moisture retention and insulation, prevention of soil erosion, and acting as fertilizer.

The former Iwamoto family residence was built around the early 19th century (late Edo period). After its construction, various modifications were made, such as the addition of a bathroom, storage, and the expansion of the lavatories, and it continued to be used until the late Showa period. When the residence was relocated and restored to the Yamato Folk Park, efforts were made to remove later modifications, aiming to recreate the original appearance of the building as much as possible, allowing visitors to learn about the lifestyle of the past.

In order to maximize the space of the earthen floor, thick ceiling beams are used to reduce the number of columns.