Room areas display on the Properties palette, in tags, and in schedules for rooms.
To compute the area of a room, Revit LT does the following:
- Finds room boundaries. Many model elements have a Room Bounding parameter. For some elements (such as walls and columns), the Room Bounding parameter is turned on by default. For other elements, you must turn on the Room Bounding parameter. (See About Room-Bounding Elements.) To define room boundaries where no walls exist, use room separation lines. (See About Room Separation Lines.) You can also change the wall layer at which the room boundary is located. (See Change the Room Area Boundary Location.)
- Uses the computation height. The computation height is a defined height above the base level of the room. Revit LT measures the perimeter of the room at this height. If a building includes sloped walls or other atypical features, you may need to adjust the computation height to achieve more accurate room areas and volumes. See About the Computation Height for Rooms.
By measuring the perimeter of the room at the defined height, Revit LT determines the area of the room.