The Bath House is typical of the 1930s construction used in outbuildings throughout Irvine Ranch. Constructed in 1931, it replaced the restroom facilities within the Bunkhouse when it was converted from an open dormitory to individual rooms. Though the exterior is fashioned simply of wood framing, a corrugated roof and metal siding, the interior of the Bath House is very detailed, featuring individual shower stalls, wood partitioned toilet stalls, washing basins, wall sinks and two glass skylights on the east roof.