Have you ever compared your home’s square footage on the county assessor’s website with the number reported in a real estate listing or appraisal and discovered they don’t match?
It’s more common than you might think.
While square footage is an important property characteristic, not every source measures or reports residential space using the same standards.
County records aren’t always the final word
County assessor records are developed primarily for property assessment purposes. The information may originate from building plans, permits, historical property records, or other available data.
Depending on the property, those records may not reflect subsequent additions, remodeling, or differences in how individual areas are classified.
An appraisal, on the other hand, may involve independent measurements and reporting requirements specific to the assignment.
Not all finished space is reported the same way
Consider a home with 1,500 square feet on the main level and a finished 1,000-square-foot basement.
A listing might advertise 2,500 total finished square feet. Under applicable appraisal measurement standards, however, the above-grade finished area and below-grade finished area are generally reported separately.
The basement isn’t ignored. Its contribution to value is analyzed according to how buyers respond to similar finished basement space in the market.
Other factors can affect reported square footage, including ceiling height, unfinished areas, open spaces between floors, and the way certain additions are connected to the main dwelling.
What is ANSI, and why does it matter?
The ANSI Z765-2021 standard provides a consistent method for measuring and reporting square footage in many residential appraisal assignments.
The standard helps establish how dimensions are measured, which areas qualify as finished space, and how areas with different physical characteristics are reported.
Applying a consistent measurement standard improves transparency and makes property descriptions easier to understand and compare.
Does a difference in square footage mean a difference in value?
Not necessarily.
Square footage is only one factor in a property’s market value. Design, condition, quality, location, functional utility, site characteristics, and comparable market activity also influence how buyers respond to a property.
A difference in reported square footage does not automatically translate into a proportional change in value.
Understanding the difference matters
Whether you’re preparing to sell, refinancing, settling an estate, or simply reviewing your property information, understanding how finished area is measured and reported can help you make more informed decisions.
At Actuate Valuations, Ltd., careful property observation, measurement, and market analysis are integral parts of the appraisal process.