How to Create an ANSI Z765 Square Footage (GLA) Report for a Listing

Square footage sells homes — and it also gets agents into trouble. Quote the wrong number on a listing and you risk a re-list, a renegotiation, or a complaint. The ANSI Z765 standard exists to make the measurement consistent: it defines gross living area (GLA) as finished, above-grade living space, and it keeps garages, unfinished areas, and below-grade rooms reported separately. If you are an agent, see how this fits a full listing floor plan workflow for real estate agents. (GLA is one of several abbreviations that mean something specific — see our floor plan symbols and abbreviations guide for the rest.)

vPlan AR produces an ANSI Z765-style square footage report from a scan of the home, so the number on your listing is one you can defend.

GLA vs. Total Square Footage

Gross living area is not the same as "everything under the roof." Finished, above-grade rooms count toward GLA. A finished basement is living space but is reported below-grade, separate from GLA. Garages, unfinished storage, and covered porches are excluded from GLA entirely.

Buyers, appraisers, and MLS rules all care about this distinction. A report that lumps a finished basement into GLA can overstate a home by hundreds of square feet — the kind of error that unravels a deal at appraisal.

What ANSI Z765 Actually Requires

ANSI Z765 ("Square Footage — Method for Calculating") is the American National Standard for measuring single-family homes. The current edition is ANSI Z765-2021, and since April 1, 2022 Fannie Mae has required appraisers to use it when measuring and reporting gross living area on appraisals with interior and exterior inspections for loans it purchases.

The rules that change the number most often are simple to state. Finished area must have a ceiling height of at least 7 feet over at least half of the room; any portion with a ceiling under 5 feet is excluded entirely, which matters in finished attics and rooms under sloped roofs. Any level that is partly or completely below grade is reported separately from above-grade GLA, even if it is beautifully finished.

Garages and unfinished spaces are not finished area. Openings to the floor below — a two-story foyer or a great room with a vaulted ceiling — do not count as floor area on the upper level. Stairs count toward the floor from which they descend. Measurements are taken to the nearest inch or tenth of a foot, and the final square footage is reported to the nearest whole square foot.

Interior Scans vs. Exterior Measurement

One detail trips people up: for detached houses, ANSI Z765 measures from the exterior of the walls. A room scan captures interior dimensions, so a sum of interior room areas will come in lower than an exterior-measured figure by roughly the footprint of the walls.

That is why vPlan AR describes its output as an ANSI Z765-style report. It gives you a consistent, room-by-room breakdown that applies the standard's categories — above-grade living, below-grade finished, garage, unfinished — so you can see exactly how a figure was built. It does not replace an appraiser's official measurement, and you should not market it as one.

Common GLA Mistakes to Avoid

Counting a finished basement as GLA is the most expensive error, because it can inflate a listing by hundreds of square feet. Close behind are counting the airspace of a two-story foyer on the upper floor, including low-ceiling attic space under 5 feet, and treating an unheated three-season porch as living area.

Garage conversions deserve a second look too: if the space is not finished to the same standard as the rest of the home and connected to it, many appraisers will not count it. When in doubt, classify conservatively and note the space separately — the per-room schedule makes that easy.

Step 1 — Scan Every Level

Scan each floor of the home, including the basement if it's being measured. vPlan AR supports multi-level projects, and it knows which levels sit below grade from their elevation — so basement rooms are treated correctly by default.

Each room's area is computed from the scan, so you're not transcribing tape measurements into a calculator.

Step 2 — Classify Each Space

In the editor, set each room's Area Type: Living (counts as GLA), Below-grade finished, Garage, Unfinished, Covered/porch, or Other. New rooms default to Living, so you only reclassify the exceptions — tag the garage, the unfinished mechanical room, the covered patio.

This single control is what makes the report standards-aligned: the math follows your classification rather than guessing. Area classification and the report are a Pro and Business feature.

Step 3 — Export the Square Footage Report

Tap Export and choose Square Footage Report. The PDF leads with the headline GLA figure, then a full breakdown — GLA, below-grade finished, garage, unfinished, covered — followed by a per-room schedule grouped by category, the floor plan, and a note on the measurement method.

It's the artifact you can hand to an appraiser, attach to a listing file, or keep as your record of how the number was derived.

Why It Protects You on a Listing

When square footage is challenged, "here's the room-by-room report showing exactly what I counted" is a far stronger position than a number copied from old tax records. The report shows exactly what counted as GLA and what didn't, with the plan to back it up.

Pair it with a branded marketing floor plan from the same scan, and one walkthrough produces both the document that protects you and the one that markets the home. The same accurate square footage matters just as much for the homeowner's insurance — see our guide on documenting a home for insurance before a loss for how an under-measured dwelling coverage limit becomes a problem nobody notices until it's too late.