Definitions


Interior Area is a per floor calculation, made by measuring to the inside surface of the exterior walls.

Excluded Area is a sum of interior areas of all rooms (measured to the inside surface of room walls) that are excluded from the Interior Area for a floor. Prescribed area exclusions can vary from region to region. Examples of exclusions are spaces open to below, garages, cold cellars, crawl and reduced height 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 for a floor. The iGUIDE PDF floor plans use colour to highlight all included areas. All excluded areas are shown in white.

Exterior Area is a per floor calculation, made by measuring to the outside surface of the exterior walls, see below for calculation details.

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 is the sum of all Interior Areas.

Total Excluded Area is the sum of all Excluded Areas.

Total Exterior Area is the sum of all Exterior Areas.

Unfinished Area is the sum of interior areas of all unfinished rooms (measured to the inside surface of room walls).

Finished Area is Exterior Area minus Unfinished Area. Finished Area includes the footprint of interior and exterior walls.

iGUIDE Exterior Area Calculation

Exterior Area = [Perimeter Wall Thickness] x [Perimeter Wall Length] + [Interior Area]

Notes

  1. Perimeter Wall Thickness is an independent measurement taken from the property, typically, at the main entrance. Considerations are not made for varying wall thickness around the perimeter.
  2. Perimeter Wall Length is the sum of lengths of all exterior wall segments on a particular floor. When used to calculate Total Exterior Area Above Grade based on Total Interior Area Above Grade, it is the sum of perimeter wall lengths of all floors above grade.

Disclaimer

All dimensions and floor areas must be considered approximate and are subject to independent verification.

PDF Floor Plans

  • RECA-RMS: Colour is used to indicate all included areas. Excluded and not reported areas are shown in white. Walls are always shown in black.
  • ANSI Z765: Colour is used to indicate all finished areas. Unfinished and not reported areas are shown in white. Walls are always shown in black.

More information about the standards:

RECA-RMS: https://www.reca.ca/licensees-learners/tools-resources/residential-measurement-standard

ANSI Z765: https://www.homeinnovation.com/z765