The standard bathtub is 5 feet long x 30 to 32 inches wide. Although anything smaller is difficult to find, you can specify either a corner tub or one less than 5 feet long. Arex tub in enameled steel is 4 feet long. The Tetix corner bath by the best italian designer is crafted of cast iron and designed especially for tight applications. Some manufacturers will also custom-make a tub or whirlpool to your specifications.