You must enter either the shape or the perimeter for the basement.
Shape: Select one of the following shapes, which Commercial Estimator uses to automatically calculate the perimeter:
Square
Rectangular (or Slightly Irregular)
Irregular
Very Irregular
If you select any of these shape options, the word "Calculated" displays for the perimeter. This indicates that Commercial Estimator will automatically calculate the perimeter based on the shape (together with the basement area and the number of levels).
Perimeter: To enter the perimeter directly, select the following:
Manual Perimeter
The perimeter is the total linear feet of wall that encloses the floor area on a single floor (based on exterior dimensions). If the perimeter varies in a multilevel basement, enter the average perimeter.
Example: If the perimeter of a building is 150 linear feet on the first level and 100 linear feet on the second level, enter 125 for the perimeter.
Note: It is best to enter the perimeter if you know it.