Abstract: An animal housing system, for example, a horse barn, is constructed to permit ready access by a vehicle for purposes of cleansing the interior of the structure and removal and replacement of the bedding and supporting surfaces. The housing system is structured to incorporate exterior and internal walls arranged to form individual stalls; the interior walls, and at least a portion of the exterior walls, are arranged to be movable to alternate positions to provide an unobstructed passage extending the length or breadth of the entire structure to permit a vehicle to pass therethrough.