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ANSI Z765 2021 Standard Explained

What is ANSI Standard Z765-2021 and how does it apply to Real Estate Appraisals?

As of April 1, 2022, Fannie Mae requires appraisers to follow ANSI Z765‑2021 (AKA “ANSI standard”) as the standard for most residential appraisals.

If you have looked at a recent appraisal and noticed that the square footage is different from an older appraisal or listing, there is a reason. In many cases, the difference comes from this national measurement standard, ANSI Z765‑2021.

What is ANSI Standard?

ANSI Standard is a nationally recognized standard that explains:

  • How a home must be measured
  • Which areas can be counted as living space
  • How area calculation of total square footage, also known as Gross Living Area or GLA, is calculated

This standard changed how homes are measured and how living space is reported, bringing consistency to real estate appraisals across the country.

The Goal is to Standardize Gross Living Area

Appraisers must now follow one consistent set of rules. This could affect your home’s reported square footage.

  • A new appraisal may not match older appraisals, MLS listings, or tax records
  • This does not mean the home changed, only that the measuring rules did

The goal is fairness, accuracy, and consistency across all appraisals.

How Measurements Are Taken Under the Standard

ANSI Z765‑2021 sets clear rules for how measurements are handled, including:

  • Exterior wall dimensions are rounded to the nearest inch or tenth of a foot
  • Area calculation is rounded to the nearest whole square foot
  • Measurements follow a uniform, repeatable process nationwide

This helps ensure that two appraisers measuring the same home should arrive at very similar results.

What Counts as Gross Living Area

Not all finished space automatically counts as living area under the standard. Several factors now matter, including:

  • Ceiling height
  • Sloped or angled ceilings
  • Whether any portion of a level is below ground

Important points:

  • If any part of a floor level is below grade, meaning below ground level, the entire level must be reported as basement area and cannot be included in GLA
  • This rule often affects bi-level and split-level homes.

What Types of Homes This Applies To

ANSI Z765‑2021 applies to:

  • Single family homes
  • Townhomes and rowhouses
  • Manufactured homes
  • Detached dwellings

For condominiums and co-ops:

  • The standard is followed unless the unit is in an apartment style or multifamily building
  • In those cases, measurements are taken from the interior perimeter, which has long been the accepted method

What About 2- to 4-unit Properties?

Although the standard was written primarily for single family homes, Fannie Mae also requires it to be followed for certain 2- to-4-unit properties, including:

  • Detached units
  • Side by side units that share a single wall, such as townhouses or rowhouses

How Garages Are Handled

Garages are not considered living space, even when they are attached to the home. Under ANSI standard:

  • Attached and partially attached garages are excluded from GLA
  • Measurements stop at the interior wall where the garage meets the living area
  • This is because if there were no garage, that side of the wall would be the end of an exterior wall.

Benefits of ANSI Z765‑2021

Although the changes can be confusing at first, this standard provides important benefits:

  • More consistent square footage reporting
  • Fewer discrepancies between appraisals
  • Clearer explanations of what is and is not living space
  • Stronger, more defensible appraisal reports

While not mandated by HUD nor VA, both allow use of ANSI Z765-2021 measurement standard in their appraisal reports.

Learn more from Fannie Mae

Fannie Mae provides detailed guidance and answers to common questions about measuring homes under this standard. You can view their measurement guidelines here:

https://singlefamily.fanniemae.com/media/30266/display

Need help understanding your appraisal?

If your home’s square footage looks different than expected, we are here to help. Contact us today to:

  • Understand how ANSI Z765‑2021standard applies to your home
  • Get clear, straightforward answers without the technical confusion

At Quality Title & Abstract Agency and The Jordan Real Estate Group, we stay ahead of the curve so you don’t have to. Whether you’re closing a deal or assessing a property’s value, our team is here to support your success.