The common fitted Western kitchen, developed in the early 20th century, is typically an arrangement of assembled unit cabinetry covered with a more-or-less continuous countertop work surface. The "unfitted" kitchen design style exemplified by Johnny Grey may also include detached and/or varied countertop surfaces mounted on discrete base support structures. Primary considerations of material choice and conformation are durability, functionality, hygienics, appearance, and cost.
When installed in a kitchen on standard (U.S) wall-mounted base unit cabinets, countertops are typically about 25-26 inches (635–660 mm) from front to back and are designed with a slight overhang on the front (leading) edge. This allows for a convenient reach to objects at the back of the countertop while protecting the base cabinet faces. Finished heights from the floor will vary depending on usage but typically will be 35-36" (889–914 mm), with a material thickness depending on that chosen. They may include an integrated or applied backsplash to prevent spills and objects from falling behind the cabinets. Kitchen countertops may also be installed on freestanding islands, dining areas or bars, desk and table tops, and other specialized task areas; as before, they may incorporate cantilevers, freespans and overhangs depending on application. The horizontal surface and vertical edges of the countertop can be decorated in manners ranging from plain to very elaborate. They are often conformed to accommodate the installation of sinks, stoves (cookers), ranges, and cooktops, or other accessories such as dispensers, integrated drain boards, and cutting boards.
