iGuide Method of Measurement
Interior Area is a per floor calculation, made by measuring to the inside surface of the exterior walls. Prescribed area exclusions can vary from region to region. Examples of exclusions are spaces open to below, garages, cold cellars, crawl spaces, non-enclosed open spaces, such as decks and balconies. The footprint of all interior walls and staircases is typically included in the reported Interior Area. The iGuide PDF floor plans use a distinct color to highlight all included areas. They should be referenced for details on included and excluded areas.
Exterior Area is a per floor calculation, made by measuring to the outside surface of the exterior walls.
Grade is the ground level at the perimeter of the exterior finished surface of a house. A floor is considered to be above grade if its floor level is everywhere above grade.
Total Interior Area Above Grade is the sum of all Interior Areas above grade.
Total Exterior Area Above Grade is the sum of all Exterior Areas above grade.
Total Interior Area Below Grade is the sum of all Interior Areas below grade. No corresponding value is calculated for Exterior Areas below grade.
iGuide Exterior Area Calculation
Exterior Area = [Perimeter Wall Thickness] x [Perimeter Wall Length] + [Interior Area]
All dimensions and floor areas must be considered approximate and are subject to independent verification.