Introduction
When it comes to appraisals, one of the most misunderstood aspects for both homeowners
and investors is Gross Living Area, often referred to simply as “square footage.” In coastal
markets like ours — where enclosed porches, sunrooms, and outdoor living spaces are
common — understanding what actually counts toward GLA can make a significant
difference in your appraisal and valuation outcomes.
In an appraisal, square footage isn’t just a number — it’s a key driver of value, used to
compare your home to similar properties and calculate price-per-square-foot. But not all
space is created equal. Let’s break down what counts, what doesn’t, and how it’s measured
according to national standards.
What Is Gross Living Area (GLA)?
In appraisal practice, GLA refers to the total finished, above-grade living space in a home.
It’s the portion of the property that contributes most directly to market value, and it’s
measured according to nationally recognized standards developed by the American
National Standards Institute (ANSI).
The ANSI standard most commonly used today is ANSI Z765‑2021, which provides a
uniform method for measuring living area in single-family homes. While you might see
“GLA” on appraisal reports or county records, ANSI itself defines this category as abovegrade
finished area — and that measurement drives how appraisers determine the official
square footage of most homes during an appraisal.
The Core ANSI Rules for GLA
1. Above-Grade: Only space that is completely above ground level is included. If any part of
an area is below grade, even slightly, it is excluded from GLA and reported separately.
2. Finished and Livable: The area must be finished — meaning it has walls, ceilings, and
flooring similar to the rest of the home — and be suitable for year-round use.
3. Permanently Heated: Room temperature control must be provided by a permanent
heating system, not portable heaters. This ensures the area is genuinely suitable for yearround
living.
4. Minimum Ceiling Height: For space to count toward GLA, ANSI requires that at least 50%
of the area have a ceiling height of 7 feet or more. Sloped ceilings (like in some bonus rooms
or attic spaces) must also meet specific ANSI height requirements to count.
5. Continuous, Interior Access: The area must be directly accessible from other living areas
of the home. Spaces that are only reachable through a garage or unfinished area do not
count toward the main GLA.
Common Spaces That Don’t Count as GLA
Even though they might feel like part of the living space, these areas are typically not
counted as GLA under ANSI standards:
– Enclosed Porches or Sunrooms — Unless they are finished to the same standards as the
rest of the home, have permanent heating/cooling, and are directly accessible, they’re
usually excluded.
– Three-Season Rooms — Nice for outdoor living, but if they aren’t conditioned for yearround
use, they aren’t considered GLA.
– Garages (even finished) — Always separated from GLA in an appraisal.
– Basements (finished or not) — All below-grade space is reported separately and not
included in GLA.
– Balconies, Patios, Decks — Exterior living spaces are excluded from GLA even if covered or
enclosed.
What About Those Enclosed Porches & Sunrooms?
This is where we see the biggest confusion — especially here in coastal areas where
outdoor living spaces are popular.
Here’s the key: enclosure alone doesn’t make a space part of GLA. Even if a porch has walls
and screens, if it’s not finished like the interior of the house and doesn’t have permanent
heating and cooling, it does not count as GLA.
This means a homeowner might list a property as “2,000 sq ft including sunroom,” but the
official appraisal may report a smaller GLA because the sunroom is excluded under ANSI
measurement rules. That’s not a mistake — it’s how uniform appraisal standards ensure
consistency across markets.
How GLA Impacts Value
GLA isn’t just academic — it directly affects price per square foot, one of the most reliedupon
metrics in the appraisal process. Since comparable sales are adjusted based on
differences in living area, an accurate GLA figure helps appraisers make fair apples-toapples
comparisons between properties.
If your property’s listed square footage differs from ANSI-based GLA, the appraisal will use
the ANSI figure — and that can influence value, whether you’re preparing to sell, refinance,
or plan renovations.
Bottom Line for Homeowners & Investors
Understanding how GLA is defined and measured — especially in coastal communities
where porches, sunrooms, and outdoor spaces are common — helps you:
– Set accurate expectations before an appraisal
– Plan renovations wisely (especially if you want the square footage counted)
– Communicate clearly with appraisers and agents
– Avoid surprises in valuation outcomes
When it comes to living area, not all square footage is equal — and knowing the ANSI
standards gives you a clearer picture of what truly counts.
If you have questions about how your property’s GLA is calculated, or if you want a
professional appraisal to help set the right value, contact For What It’s Worth Appraisals
today — we’re here to help you get clarity and confidence in your property’s value.
