Standard (Alcove) Bathtubs
The alcove tub, the most common type of bathtub in the U.S., came into popularity with the mass production of the squared corner tub after World War I.
It is enclosed on three sides, with only the front exposed, sometimes requiring a separate apron.
Because there are fewer finished surfaces, these models tend to be more economically priced than
freestanding units.
Most units are incorporated into tub/shower combinations by the addition of wall surrounds. They are enclosed on the open side with a shower door or curtain.
But they tend to be fairly shallow to allow entry for showering. These are typically the least decorative types of tubs from a design standpoint; they tend to be plain and simple.
Built-in alcove baths must be specified as left-hand or right-hand, which is the side the drain is on when facing it. Many alcove models have matching shower doors, either by the same or by different manufacturers.

Faucets for alcove units are typically wall-mounted with only the waste and overflow mounted on the tub.
Alcove tubs provide the best locations for
grab bars. Grab bars can be mounted in a number of positions that allow the user to lift himself out of the tub by pulling as well as by pushing, which requires different arm movements.
The walls surrounding the alcove Bathtub are generally covered in a waterproof material, such as ceramic tile. This is especially important if a shower is included.
A bathtub surround (or wall kit) is an easy way to provide a handsome, easy-to-maintain, and watertight barrier around a tub or shower alcove.
Surrounds can be installed over drywall, plaster, tile, or any solid, flat wall. Most kits contain either three or five pieces that overlap to account for different dimensions. Kits include detailed instructions.