2010 ADA Standards for Accessible Design Pocket Guide

608.2.1 Transfer Type Shower Compartments.

Transfer type shower compartments shall be 36 inches (915 mm) by 36 inches (915 mm) clear inside dimensions measured at the center points of opposing sides and shall have a 36 inch (915 mm) wide minimum entry on the face of the shower compartment. Clearance of 36 inches (915 mm) wide minimum by 48 inches (1220 mm) long minimum measured from the control wall shall be provided.

Figure 608.2.1 Transfer Type Shower Compartment Size and Clearance