1. Traditional crown molding. Traditional crown molding tends to be the industry standard for kitchen cabinetry. Here it has been used to fill an empty space between the cabinets and the ceiling. Empty space above cabinets is a common problem, because the distance fluctuates depending on ceiling height and cabinetry height. If you have an average ceiling height, about 8 feet high, 3 to 6 inches of crown molding can usually help fill any kitchen cabinet gaps.