Are Basements Included in Square Footage?

No. Under ANSI Z765, basements are excluded from GLA -- regardless of finish level. They are reported separately as below-grade finished area.

The ANSI Z765 Rule

ANSI Z765 defines Gross Living Area as above-grade finished area only. "Above-grade" means the floor level is at or above finished exterior grade on all sides. A basement floor, by definition, sits below exterior grade on at least one side -- which makes the entire level below-grade under this standard.

This applies regardless of finish level. A fully finished basement with a home theater, full bath, and egress windows does not count as GLA. Finish quality, ceiling height, and interior access are not the determining factors -- the floor-to-grade relationship is.

ANSI Z765 is the standard required by Fannie Mae, Freddie Mac, and the FHA for residential appraisals. Appraisers following UAD guidelines are required to report GLA using this methodology. Any residential appraisal going to a conventional or government-backed lender will apply this rule.

How Finished Basement Area Is Reported

Below-grade finished area is not ignored -- it is reported separately on the appraisal form and receives its own value adjustment. On the URAR, the sales comparison grid includes a line for below-grade finished rooms and area. Appraisers make a separate adjustment when the subject property's finished basement differs from comparables.

The practical effect: a 1,000 sq ft finished basement adds value to the property, but that value is captured through a below-grade adjustment rather than by inflating the GLA figure. In markets where finished basements are common and well-supported by comparable sales, the adjustment can be substantial.

Why This Creates Confusion with Listing Square Footage

MLS listings frequently include finished basement area in the total square footage figure, particularly when the basement is highly finished and the listing agent wants to present the largest possible number. A property with 1,400 sq ft of above-grade living area and a 1,000 sq ft finished basement may appear in the MLS as a 2,400 sq ft home.

When the appraiser reports 1,400 sq ft GLA, that figure is not wrong -- it is ANSI Z765-compliant. The listing figure is what is misleading. This discrepancy is one of the most common sources of dispute between listing agents, sellers, and appraisers, and it is almost always traceable to the basement inclusion question.

See: Why listing square footage is often inaccurate and Appraisal square footage vs. listing square footage.

What About Walkout Basements?

Walkout basements are frequently cited as an exception. They are not. A walkout basement is still below-grade under ANSI Z765.

The standard's test is whether the floor level is at or above finished exterior grade on all sides. A walkout basement typically has three sides below grade and one side at or near grade -- meaning the floor-to-grade test fails on multiple sides. Exposure on one wall does not change the grade relationship on the other three.

The only scenario where a walkout level might qualify as above-grade GLA is when the entire floor is at or above finished exterior grade all the way around -- which is a bi-level or split-level configuration, not a basement. See: Walkout basement square footage and appraisals.

Quick Reference: GLA Inclusion by Space Type

Space	Counts as GLA?
Finished basement	No
Walkout basement	No
Above-grade bonus room	Yes (if ceiling height requirement met)
Above-grade finished attic	Yes (if at least 50% has 7 ft ceiling clearance)
Garage	No
Sunroom (heated, interior access)	Yes

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