Wall Cabinets - are cabinets that are normally installed on the wall above the countertop, the standard clearance for the space between the wall cabinets and the countertops is 18” high. Wall cabinets come in all widths starting from 9” all the way to 36” or 42” wide. They are 12” deep and normally comes with adjustable height shelves. Standard heights of wall cabinets include 30”, 36”, and 42” high but some manufacturers make them in 27”, 33”, and 39” high.