Abstract: A full size building having three walls, an open side and a roof but no floor can be moved along parallel rails from an open free standing position to a closed position where the building abuts another structure to completely enclose an outdoor area. The building is of conventional construction but is erected over a rigid framework of iron beams. A series of roller assemblies containing rotatable axles is attached to the underside of rigid framework. The axles rest directly on the rails and rotate smoothly by means of bearings as the building moves along the rails. Stabilizers prevent wobble and keep the building on the rails when it is being moved. Locks prevent any movement when the building is in either the open or closed position. Additional locking means prevent lateral movement when the building is locked in the open position. The building can be moved using a winch and cable system or using a unique suspended sprocket wheel and track system. Concrete footings form the base for the rails.