Abstract: A window frame assembly for attachment to a window opening in a support structure, the assembly includes a first frame and a second frame that engage each other from opposite sides of the window opening, wherein the first frame includes a window and at least one abutment member adapted to be fixed to the support structure. The second frame includes at least one abutment member, such as a jamb, a head or a sill. The first frame includes a recess between the at least one abutment member and the window such that, upon engagement of the first frame and the second frame from opposite sides of the window opening, the at least one abutment member of the second frame is received by the recess of the first frame.