Code of Federal Regulations Title 24. Housing and Urban Development § 24.3280.111 Toilet compartments

(a) Each toilet compartment must be a minimum of 30 inches wide, except, when the toilet is located adjacent to the short dimension of the tub, the distance from the tub, to the center line of the toilet must not be less than 12 inches. At least 21 inches of clear space must be provided in front of each toilet.

(b) All bathroom passage doors in single-section homes must have a minimum clear opening width of 23 inches, and bathroom passage doors in multi-section homes must have a minimum clear opening width of 27 inches.