Figure 31. Lavatory Clearances.
The minimum knee clearance must be free of equipment or obstructions for a minimum of 8 inches (205 mm) extending from the front edge of the lavatory back toward the wall. This knee clearance must be 29 inches (735 mm) high at the front of the lavatory and no less than 27 inches (685 mm) high at a point 8 inches (205 mm) back. In addition, a minimum 9 inches (230 mm) high toe clearance must be provided extending back toward the wall to a distance no more than 6 inches (150 mm) from the back wall. The toe clearance space must be free of equipment or obstructions.

The maximum height of the lavatory is 34 inches (865 mm). The bottom edge of a wall-mounted mirror must be mounted no more than 40 inches (1015 mm) above the floor.