A minimum space of 24 inches must be planned in front of a shower entry.
Commercial bathroom size code.
Code for the doorway opening to the bathroom is 32 inches with 34 inches being.
The walls or partitions shall begin at a height not more than 12 inches 305 mm from and extend not less than 60 inches 1524 mm above the finished floor surface.
For commercial bathrooms with multiple toilet stalls and handicap the rules change a little.