A sidelight is a glazed opening adjacent to a door. A room with a sidelight
will feel more open from the inside and more welcoming from the outside.
A person can glance into an office or conference room to determine if it
is occupied before entering. An occupant can see a visitor approach. Thus
sidelights create a more welcoming feeling from the outside and a more secure
feeling from the inside.
Widths vary, but typically a sidelight to an office or conference room
door might be 1 1/2 feet wide.