Abstract: A system for extending the height of an existing cubicle wall is herein disclosed. The system comprises a top cap overlay fitted with a vertical extension panel. The cross-section of the top cap overlay is uniform and consistent along its length. The top cap overlay includes a lower channel extending along the length of the top cap overlay for mounting to the top of an existing cubicle wall. The top cap overlay also includes at least one upper channel or groove extending along the length of the top cap overlay for receiving a length of vertical extension panel. The upper channel or groove comprises at least two walls extending from the top of the horizontal panel and spaced sufficiently apart to receive and hold the thickness or width of the vertical extension panel. Further improvements for the system are disclosed, along with a method for using the system.