Window Sill 101: Everything You Need to Know
Nov 30, 2020 · Technically, a window sill only exists on the exterior of a house or apartment. In architectural terms, the portion of the ledge that is on the inside is called a window stool. But, many people use the term “window sill” to describe both the exterior and interior parts. Benefits of a Window Sill. A window sill is not optional.