Hitoyoshi City, Kumamoto Prefecture, is a flood-prone area that suffered large-scale flood damage in the torrential rain disaster of July 2020. The wooden public bathhouses there, which are not registered as cultural assets, have overcome previous flood damage by using local and traditional rehabilitation methods. Through a literature review and interviews with residents, this study identifies and compares the rehabilitation methods of two historic bathhouses, one in the central city and a newer one in the suburbs, and investigates the impact and effectiveness of these methods on the recovery and reconstruction within the affected area. In addition, it shows what must not be overlooked in the ongoing reconstruction and town planning of Hitoyoshi City. This study is unique in that it focuses on buildings that are not registered as cultural properties, and comprehensively deals with the role that the building rehabilitation process has played in building the local community and the history of recovery that has overcome disasters. In the recovery and reconstruction of Hitoyoshi City, which is regularly hit by flooding, it became clear that the regeneration of a communal wooden building, such as a public bathhouse, provided an opportunity to establish and strengthen the ties within a close community and to the outside world. Such a rehabilitation process involving communities within and outside the area is expected to lead to the strengthening of local resilience.