2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017

11B-809.5.5.1 Notification.

A hard-wired electric doorbell shall be provided. A button or switch shall be provided outside the residential dwelling unit primary entrance. Activation of the button or switch shall initiate an audible tone and visible signal within the residential dwelling unit. Where visible doorbell signals are located in sleeping areas, they shall have controls to deactivate the signal.