The building width refers to the horizontal dimension of the building ground plan. It must be in units compatible with the department areas. The building always has a rectangular shape. The building area is computed as the product of the building width and building depth. The building and department areas should be expressed in compatible units to the building width and depth, i.e., if the building depth and width are expressed in feet then the building and department areas must be expressed in square feet.
The building width of a project is set when the project is created with the New command or when the project is read from an external ASCII file with the Import command of the File menu. The building width can be modified at any time by the Building Dimensions command of the Edit menu.