Abstract: A building suitable for use as a greenhouse within which to conduct hydroponic gardening is formed by a pair of side walls and a pair of end walls each of which is provided with a peripheral frame. It is covered by a roof that also has a peripheral frame that fits within the upper portions of the frames of the several sides. The roof is covered with a sheeting material which extends beyond the margins of the frame and is resilient whereby those resilient extensions rest upon the upper portion of the frame of the several sides in assembled condition and form a seal between the roof and sides. Similar extensions of sheeting beyond the peripheral frame of the sides provides sealing at the vertical corners of the building. The sides and roof are secured together by fasteners that can be selectively fastened and unfastened from the interior of the structure permitting complete dissembly and reassembly of the building at will.