Abstract: A prefabricated window fame with a decorative window subassembly within for use in a building having a window opening in a wall or a door with a rail about its perimeter. The window frame includes a first, or back, member and a second, or front, member overhanging the window subassembly therebetween and fastened together to form a window frame groove matching the window frame rail. The front frame member is mountable on the outside of the window opening and the back frame member is mountable on the inside of the window opening with the window subassembly therebetween. Frame members are identical, symmetric components with one when inverted matching another to comprise front and back frame members. The frame members are secured together by a plurality of fasteners secured to the frame members about their perimeters. The fasteners comprise matching latch hooks or posts with ridges matching frame holes with ridges.