Abstract: An assembled basement window for insertion in a building form into which concrete will be poured around the window. The window will have an outer frame fabricated form pieces cut to length from a common extrusion. A header and jambs will be cut to length from a common extrusion. The header and jambs and a sill are assembled into the outer frame so as to form an inner window frame into which the window sashes can be removably inserted. The components of the inner frame can be removably inserted into the outer frame in different orientations. If the window as assembled is placed in a form upside down or inside out, the sashes and inner frame can be removed and reoriented without having to remove the outer frame.