A window frame device is disclosed for permitting the adjustable setting of a window frame adjacent to a foundation form. The device includes a window frame which has a head having a first and a second side, the first and second sides defining respectively a first and a second slot. A sill has a first and a second extremity, the first and second extremities defining respectively a first and a second channel. A first jamb extends between the first side of the head and the first extremity of the sill and a second jamb extends between the second side of the head and the second extremity of the sill. A first tie adapter has a first and a second end, the first end defining a tenon which cooperates with the first slot, the second end defining a tab which cooperates with the first channel. A second tie adapter has a first and a second edge, the first edge defining a further tenon which cooperates with the second slot. The second edge defines a further tab which cooperates with the second channel, the arrangement being such that when the tie adapters are located adjacent to the respective jambs with the tenons and tabs cooperating with the respective slots and channels, the adjustable setting of the window frame relative to the foundation form is permitted.