A glass panel assembly for a building is provided to minimize contamination of an outer side of the building and facilitate the construction of the building. A glass panel assembly for a building comprises an upper glass panel(10) and a lower glass panel(20). The upper glass panel has the predetermined thickness. The lower glass panel is connected to a lower part of the upper glass panel. A fixing hole(22) for connection with a fixing unit(30) is formed through the lower glass panel. The fixing hole is expanded at an upper part near the upper glass panel. The upper and the lower glass panels are adhered to each other using an adhesive sheet(15). The adhesive sheet is made from resin melt by high temperature and high pressure so that the upper and the lower glass panels can be adhered to each other. The fixing unit further comprises a connection member(31) having a screw hole. An adjusting unit(40) composed of a bolt(41) and a pair of nuts(42,43) is installed to adjust the height and posture of the upper and lower glass panels.
