2010 ADA Standards for Accessible Design Pocket Guide
409.4 Elevator Cars.
Private residence elevator cars shall comply with 409.4.
Elevator cars shall provide a clear floor space of 36 inches (915 mm) minimum by 48 inches (1220 mm) minimum and shall comply with 305.
The clearance between the car platform and the edge of any landing sill shall be 1½ inch (38 mm) maximum.
Each car shall automatically stop at a floor landing within a tolerance of ½ inch (13 mm) under rated loading to zero loading conditions.
Control buttons shall be 3/4 inch (19 mm) minimum in their smallest dimension.
Control panels shall be on a side wall, 12 inches (305 mm) minimum from any adjacent wall.
Emergency two-way communication systems shall comply with 409.4.7.
A telephone and emergency signal device shall be provided in the car.
If the telephone or device is in a closed compartment, the compartment door hardware shall comply with 309.
The telephone cord shall be 29 inches (735 mm) long minimum.