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Postsecondary Education

NCES 2006-160
May 2006

3.2.3 Nonassignable Area

  1. Definition. The sum of all areas on all floors of a building not available for assignment to an occupant or for specific use, but necessary for the general operation of a building.
  2. Basis for Measurement. Nonassignable Area is computed by physically measuring or scaling measurements from the inside faces of surfaces that form the boundaries of the designated areas. Exclude areas having less than 3-foot clear ceiling height unless the criteria of a separate structure are met.

    Measured in terms of Nonassignable Area,

    Nonassignable Area = Sum of the Areas Designated as the Three Non-assignable Space Use Categories

  3. Description. Included should be space subdivisions of the three nonassignable space use categories—building service, circulation, and mechanical—that are used to support the building’s general operation.
  4. Limitations. Deductions should not be made for necessary building columns and projections. These small areas are excluded as they represent an insignificant percentage of the total area of an average-sized space. Capturing their area would be unduly burdensome relative to the very small contribution they would make toward precision. Areas defined as assignable should not be included.

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