Learn · Real Estate · 6 min read

Part of: GLA & Appraisal Standards: The Complete Guide

Part of: Square Footage in Real Estate: The Complete Guide

How to Read Square Footage on an Appraisal Report

You just got the appraisal back. The square footage is lower than the listing, sometimes by hundreds of square feet. Here's what the appraisal is actually measuring, where to find it in the report, and what options you have if you think it's wrong.

Calculate ANSI-compliant GLA from any floor plan

Upload, trace the perimeter, get a defensible GLA in minutes. Used by appraisers nationwide.

Try PlanSnapper

What "GLA" means and why it matters

Appraisers report square footage as gross living area (GLA), the finished, above-grade, heated living space measured using exterior dimensions. This is the number that goes into the sales comparison grid and directly influences the appraised value.

GLA is a specific, standardized metric defined by ANSI Z765-2021, the measurement standard Fannie Mae requires for all conventional loan appraisals. It excludes garages, basements (including finished walk-outs), unfinished attic space, and covered porches. The appraisal's GLA figure may be lower than the listing's square footage if any of those spaces were included in the MLS number.

Where to find square footage in the appraisal report

On a standard 1004 URAR (Uniform Residential Appraisal Report), square footage appears in several places:

Improvement section (page 1)

The top of page 1 includes a section for the subject property's improvements. Look for the "GLA" line, typically listed as a number in square feet. This is the appraiser's measurement of the above-grade finished living area.

Basement section (page 1)

Just below the GLA, there's a basement section with fields for total basement area (in sq ft), the percentage that is finished, and what the finished area contains (bedrooms, bathrooms, rec room, etc.). This is where finished basement square footage appears, separately from GLA, as required by ANSI Z765.

Sales comparison grid (page 2)

Page 2 contains the sales comparison approach. The subject and each comparable sale each have a GLA line showing their square footage. Look for the "gross living area" row, it's one of the most prominent adjustment lines. If the subject has more GLA than a comparable, there will be a positive adjustment on the comparable's line (reflecting the value difference).

Sketch (typically page 3 or addendum)

Appraisals include a floor plan sketch showing the exterior footprint with dimensions and calculated area. Each level is typically labeled with its square footage. The sketch is the appraiser's documentation of how the GLA number was derived, it's worth reviewing to understand which areas were included or excluded.

Note: on commercial or mixed-use properties, you may see "GBA" (gross building area) instead of GLA. These are not the same metric. GBA vs GLA differ in what they include, GBA encompasses all enclosed space including garages and common areas, while GLA counts only the above-grade finished residential living space.

Common reasons the appraisal GLA is lower than the listing

Reason	Example	Is the Appraisal Wrong?
Finished basement excluded from GLA	Listed at 2,400 sq ft; appraiser reports 1,800 GLA + 600 BGFA	No, ANSI requires separate reporting
Converted space fails ANSI criteria	Garage conversion lacks permit or heat	No, appraiser applied correct standard
Different measurement method	Listing used interior room-by-room; appraiser used exterior	No, ANSI exterior is the correct standard
Unpermitted addition excluded	Addition was built without permits; lender instructed exclusion	Possibly, depends on lender + loan type
Sketch error	Appraiser missed a room or transposed a dimension	Yes, disputable with documentation

This is the most common point of confusion for buyers and sellers. Here's why the numbers differ:

Finished basement excluded. A listing often includes basement square footage in the total. The appraisal reports it separately. A home listed at 2,400 sq ft with 600 sq ft of finished basement will appraise at 1,800 sq ft GLA , even though the total finished area is still 2,400 sq ft.
Converted space doesn't meet ANSI criteria. A garage conversion, sunroom, or bonus room that was included in the MLS square footage may not qualify as GLA under ANSI Z765 (insufficient ceiling height, not heated to standard, or accessible only through non-living space).
Different measurement methodology. The listing agent may have used interior room-by-room measurement, assessor records, or a prior listing figure. The appraiser uses exterior ANSI measurement, which typically produces a slightly different number.
Unpermitted addition. An addition built without permits may not qualify for GLA inclusion, especially if habitability standards weren't met.

Does a lower GLA mean a lower appraised value?

Not necessarily, at least not by as much as buyers often fear. Here's why:

The appraiser adjusts for GLA differences across all comparables. If the subject's GLA is reported lower than in prior listings, but comparable sales are also measured consistently using the same ANSI methodology, the adjustments reflect market reality. You're not comparing against an inflated MLS figure, you're comparing against other ANSI-measured homes.

Finished basement area is also captured and adjusted separately. If the appraised value seems low because of a basement exclusion, check the sales comparison grid: the finished basement line should show a positive adjustment on any comparable that lacks a comparable finished basement.

What to do if you think the GLA is wrong

If the appraisal GLA seems materially incorrect, you have options, but "the MLS said more" is not a basis for a reconsideration of value. You need specific evidence.

Review the sketch. Check whether the appraiser excluded any finished area. If a room or level appears to be missing from the sketch, that's a specific, documentable discrepancy.
Verify the GLA independently. If you have a floor plan from a listing service (CubiCasa, Matterport, or the agent's floor plan), you can measure the above-grade perimeter yourself using a tool like PlanSnapper. If your measurement meaningfully differs from the appraiser's, you have something to work with. No floor plan? See how to get a floor plan of an existing home.
Request a reconsideration of value (ROV). Through your lender, you can formally request that the appraiser reconsider specific items. Provide documentation: a floor plan measurement, a sketch showing the discrepancy, or a prior appraisal with a different GLA. Vague objections are typically rejected; specific, documented discrepancies get reviewed.
Order a second appraisal. If the difference is large enough to affect your transaction, a second appraisal from a different appraiser is an option , though lenders typically use the first appraisal unless there's a documented error in it.

Have the floor plan? Verify the GLA yourself in minutes. Try PlanSnapper →

Understanding the sketch addendum

The sketch is your best tool for understanding how the appraiser calculated GLA. A well-prepared sketch shows:

Exterior wall dimensions for each level
Total calculated area per level
Labels for any non-GLA areas (garage, basement, porch)
Area totals for each component (main level, upper level, garage, etc.)

If the sketch shows a finished bonus room or upper level but that area isn't included in the GLA total, the appraiser may have excluded it due to ceiling height or access criteria. The addendum should explain why. If it doesn't, that's a legitimate item to raise in a reconsideration request.

Key takeaways

GLA on an appraisal is above-grade finished area only, basements, garages, and non-qualifying attic spaces are excluded by definition.
A lower GLA than the listing often reflects basements being correctly separated, not an error.
Find the GLA in the improvement section (page 1), basement section (page 1), sales comparison grid (page 2), and sketch addendum.
To dispute GLA, you need specific documented evidence, not just a comparison to the MLS figure.
A floor plan measurement tool like PlanSnapper lets you independently verify the above-grade GLA before pursuing a formal reconsideration.

Verify GLA from any floor plan before disputing an appraisal

$9 day pass · $29/month · runs 100% in your browser

Try PlanSnapper →

Related Resources

Measure floor plans in minutes, free

Upload a floor plan to PlanSnapper, trace the perimeter, and get accurate square footage instantly. No install, $9 day pass.

Try PlanSnapper →

More guides on square footage in real estate:

More guides on GLA and appraisal standards:

← Back to: GLA & Appraisal Standards: The Complete Guide

← Back to: Square Footage in Real Estate: The Complete Guide

Frequently Asked Questions

Where does square footage appear on an appraisal report?

On a standard URAR (Uniform Residential Appraisal Report), square footage appears in the Improvements section under GLA. It is also referenced in the Sales Comparison grid where the subject's GLA is compared to each comparable sale, with dollar adjustments for differences.

What does GLA mean on an appraisal report?

GLA stands for gross living area, the ANSI Z765-compliant exterior measurement of above-grade finished heated space. It is the primary square footage figure used in residential appraisals and is the number lenders rely on for underwriting decisions.

What should I do if the square footage on my appraisal seems wrong?

First compare it to other sources, your tax records, a prior appraisal, or a floor plan. If there is a meaningful discrepancy, gather your evidence and submit a Reconsideration of Value (ROV) through your lender. Include any supporting documentation such as permits, plans, or a prior ANSI measurement.

Why does the square footage on my appraisal differ from the tax record?

Tax assessors and appraisers often use different measurement methods and update records on different schedules. Assessors may use older surveys, interior measurements, or builder estimates. Appraisers use current exterior ANSI Z765 measurements. Discrepancies of 3-5% are common and do not necessarily indicate an error on either document.

How do comparable sales adjustments for square footage work on an appraisal?

The appraiser identifies the market-derived adjustment rate per square foot by analyzing sales with similar GLA differences. If the adjustment is $50 per sq ft and a comparable has 100 fewer sq ft than the subject, the appraiser adds $5,000 to that comparable's sale price. Adjustments should be consistent and supported by paired sales data.

What is the sketch on an appraisal and how is it used?

The appraisal sketch is a floor plan diagram showing the exterior dimensions of each above-grade level. It is included as an addendum to the URAR and serves as documentation for the GLA calculation. The sketch shows how each room and section was measured and how the total GLA was derived. Reviewing the sketch is the fastest way to check whether an appraiser included or excluded specific areas.

Can finished below-grade area appear on an appraisal report?

Yes. Appraisers report finished basement area separately from GLA on the URAR. The Basement and Finished Rooms Below Grade section of the form captures the basement square footage, finish level, and number of rooms. This information informs the appraiser's value adjustment but is never added to the GLA line.

Why does the GLA on my appraisal not match what I see on Zillow?

Appraisers measure GLA using exterior dimensions and ANSI Z765 methodology, which excludes below-grade space, garages, and unheated areas. Zillow typically pulls from tax assessor records or MLS listings, which may use interior measurements, include non-GLA space, or simply be outdated. Discrepancies of 5-15% between an appraised GLA and a public record figure are common and expected.

What is the sketch section of an appraisal, and how do I read it?

The sketch section shows the floor plan of the property as measured by the appraiser. Each room or space is labeled, and dimensions are shown along the exterior walls. The sketch includes a square footage calculation breakdown by floor level. Above-grade levels sum to the GLA. Below-grade finished areas appear separately. The total on the sketch should match the GLA line on page 1 of the 1004 URAR form.