Ceiling Height refers to the vertical distance between the finished floor and the highest point of a room. It is usually measured from the top of the wall or molding that outlines the perimeter of the ceiling, to the bottom of the actual ceiling surface. Ceiling height can vary greatly depending on the design and purpose of the space, but it generally ranges between 8-12 feet in residential spaces, while commercial buildings may have ceilings as high as 20 or more feet. The ceiling height is an important factor to consider when planning a room's layout, lighting, furniture placement and overall design.