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Picture of powder bath sink for Addy, plus bathroom fixture dimensions notes. Standard Bathroom Fixture Dimensions Tubs. Standard tubs with apron fronts are 60 inches (152 centimeters) long and 30 to 32 inches (76 to 81 centimeters) wide. The depth can be as little as 14 inches (35 centimeters) and as much as 20 inches (50 centimeters). Showers. Showers are required to have a minimum of 1,024 square inches, which is 32 by 32 inches (81 by 81 centimeters) of interior space — although it’s best to aim for at least 36 by 36 inches (91 by 91 centimeters). Toilets. Toilets can fit into spaces as small as 30 inches (76 centimeters) wide and 54 inches (137 centimeters) long, but at least 36 inches wide and 60 inches deep is much more comfortable. Single sinks. For a single sink, you need at least 30 inches (76 centimeters) of width, but 36 to 48 inches (91 to 107 centimeters) is more comfortable. Double sinks. You can squeeze two sinks into 60 inches (152 centimeters) of width, but 72 inches (183 centimeters) or more is preferred. Note: Metric dimensions are close translations of U.S. standards and do not represent the standardized dimensions that may apply to your country.