In architecture, a transom is a transverse horizontal bar that separates the door from the window that sits above it. It can also be a crosspiece above the doorway that allows for plenty of natural light. Ideally this would fill your entryway, alleviating the necessity for much additional lighting in the area.

What is the function of transom?

Transoms historically were used to allow passage of air and light between rooms even when doors were shut. They make perfect sense in row houses, which typically have long, narrow floor plans with windows only at the front and back.

Are transoms outdated?

Though transom windows fell out of fashion in the 1970s and 1980s, homeowners now are rediscovering how they can add a distinctive touch to a space—not to mention a little more natural light.