Portland Area Real Estate Appraisal Discussion

When getting an appraisal, homeowners are often uncertain about what areas of their home would be considered finished area by the appraiser. Recently, I posted a blog and video clarifying what areas an appraiser would consider as GLA (Gross Living Area) and what would be considered basement. To expand on that topic, I decided to clarify the difference between finished and unfinished areas of the home.

In Oregon (and many other states), residential appraisers typically follow ANSI standards when measuring a home. ANSI says that finished area (often referred to by appraisers as GLA) includes area that:

1. Is “…suitable for year-round use.”

2. Is “…similar to the rest of the house” in terms of its level of finish.

3. Is “…connected to the main body of the house by other finished areas such as hallways or stairways.”

4. Is measured from the “…exterior finished surface of the outside walls” (except on condominiums and attached homes).

5. Is a minimum of five feet in ceiling height but, “At least one-half of finished square footage must be 7’-0” where ceiling slopes.”

6. Does not include openings between levels. A two-story foyer would not be included in the measurement of both levels, but the stairway would be included in both levels. The following Portland Home Sketch shows that “Open to Below” has been removed from the area of the Second Floor (only living area is highlighted yellow on the sketch).

Portland Appraiser Home Sketch


These measurement standards mean that a finished sun porch or a finished garage may not meet the standard for finished area by an appraiser. Also a detached finished area, like a mother-in-law apartment or guest house, would not be included in finished area. This does not mean that these areas do not have value. It just means that these areas should be compared differently by the appraiser to determine what the appropriate value is.

Keeping these home measurement standards in mind, an appraiser must also be aware of local customs and imperfect data when estimating the size of a home’s living area. For example, if an appraiser follows ANSI standards to measure the subject home, but the appraiser’s comparable sales are based on a local county assessor data that follows a different standard, then the appraiser would end up with a flawed comparison and possibly an incorrect value opinion.

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Thanks for reading,



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