A storage shed comprises a plurality of posts erected onto a base. The posts comprise a prismatic profile disposed over a hollow bar to form a void and a longitudinal slot. Corrugated wall panels are disposed in between the posts. U-channels are coupled to the base to support the posts and wall panels. The wall panels include parallel latitudinal folds and longitudinal side flanges which fit into the longitudinal slots of the posts. A roof frame is disposed on top of the vertical posts and wall panels. Corrugated roof panels are disposed on the roof frame. The corrugated roof panels include parallel latitudinal folds and side portions adapted to overlap with each other. Ridge panels are disposed at the ridge of the roof frame so as to cover a portion of the roof panels on each side of the shed. Facia boards are disposed on an entrance end and a rear end of the roof frame. Doors are disposed on an entrance side of the shed. The vertical posts, wall panels, roof panels, doors, and facia boards can be made of polyvinyl chloride. An aesthetic layer may be applied to an exterior side of the wall panels and roof panels. A method for building a shed is also provided.