Noted from – SQUARE FOOTAGE–METHOD FOR CALCULATING: ANSI Z DOWNLOAD A COPY, Click Here. To claim adherence to this standard, the . American National Standards Institute is a premier source for timely, relevant, actionable information on national, regional, international standards and. ANSI Z, Single-Family Residential Buildings – Square Footage – Method for Calculating, suggests measuring and multiplying the.

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For example, when one searches for definitions of living area, several different definitions appear along with a combination of qualifiers. Per ANSI, finished area square footage is the sum of the area on each level. Appraisers have more flexibility with identification of this area.

As anai be seen, the area calculation is based upon a measurement to the centerline of the common wall. If heating and cooling is considered a finish, then the consistency of finishes throughout should apply.

The final reported finished share footage of a house is to be reported to the nearest whole square foot. Again, how would an appraiser know if a comparable only had 18 feet wide living area on the second floor if they had not inspected the interior of the comparable sale? Understand that different boards may have varying requirements; however, it is obvious that consistent like and quality is key.

The ANSI Z standard for calculating square footage. – Free Online Library

Condominium measurement will be discussed at the end of this section. This means that some rounding to the closest inch or tenth is allowed in the linear dimensions. It’s a community-based project which helps to repair anything. Contiguous Requirement The computation of the area of a house finished and unfinished is based upon attached areas. Thus, detached buildings such as storage sheds, guest houses, pool houses, etc.


Of concern is when the area is superior in quality to what a user would classify as storage, however, is not directly accessed from living area. It is a voluntary standard created through a consensus process that involves more than just appraisers and real estate agents or brokers.

This total should include the square footage of the main home as well as the square footage of the wing or addition if one has been specified. For a partition that separates a finished area from an unfinished area, with no finished walls on the unfinished side, the measurement of finished area extends to the partition closest to the unfinished area — usually a wood stud or other framing member. In this particular situation, GLA would be different based on ANSI standards which would eliminate that area, and Fannie Mae, which is based on the exterior measurements, would include this area.

Further, the house will likely be overpriced if the market values a guest house as a lower unit value than the main house. So that is pretty simple, not tough at all.

The method of area calculation is recognized in professional publications and by various professional boards as the standard for computing and labeling the area of a house. ANSI states the measurement of such areas is also based upon a linear measure of the exterior finished ans of the house to the outer edge of the floor surface area or exterior surfaces.

ANSI Z Square Footage Calculation Method | Home Innovation Research Labs

It is mandatory that living area flow from living area. However, in such instances, he or she must explain the reason for the deviation and clearly describe the comparisons that were made So as long as the appraiser can define consistent comparables with below grade and above grade areas, and they give reasonable cause, below grade areas can be included. You can see from the definitions presented, one of the primary problems is in the inconsistency of where to measure: ANSI is a central body responsible for identifying a single, consistent set of voluntary standards and verifying that the principles of openness and due process are heeded.


Finished Adjacent to Finished When finished area is adjacent to finished area the common wall is divided equally between the two areas.

Square Footage – Method for Calculating: ANSI Z765 2012 Update Process

In Louisiana a patio is often the term used to define a rear porch area. The width on the anei floor may be 20 feet.

Further, soffit is not considered finished ceiling. This may not be consistent with local practices, but is the ANSI standard.


The ceiling height limitations caused by the roof line must be considered to provide an ANSI compliant area calculation. However, if a buyer desires a three bedroom house and a guest house, the guest house should be searched through the amenity or comments category.

Even with the qualifiers in place, the definitions vary. However, know that in Louisiana, the typical custom is to include a garage as asni of the unfinished area, if attached to the house, and include the summation of this area with finished area to determine the total area under roof.