The smallest freestanding tub is 4 feet long, ideal for an adult of average height. Clawfoot tubs, such as the American Bath Factory Jester Claw Foot Bathtub, add a vintage touch to a bathroom. Pedestal tubs, such as the Pelion Acrylic Freestanding Tub, are suited for a modern look.
Built-in alcove tubs are more affordable and easily combined with a wall-mounted shower, but they require a three-wall recess. Kohler, American Standard and Bootz Industries offer built-in tubs designed for small bathrooms. As of 2015, the Villager is the most popular small bathtub offered by Kohler.
Corner tubs that mount on two walls, such as the Sea Wave V Corner Soaking Bathtub by Lyons, are more convenient that alcove tubs. The standard size of a corner tub is 4 by 4 feet. These tubs come with triangular, oval, rectangular or hourglass-shaped basins.
Japanese soaking tubs are small and deep, offering the most flexibility for small spaces. Designed for people to sit upright, these tubs come with a built-in bench. They come with stainless steel, copper or wood finishes. Diamond Spas has a line of Japanese style tubs in various sizes and finishes, such as the Stainless Steel Elliptical Ofuro Tub and the Copper Circular Japanese Soaking Tub.