Guide · Updated July 29, 2026
Is my commercial property over-assessed? The screening signals
Commercial owners rarely get a signal that their assessment drifted high — the notice arrives, the number is big, and comparing it to anything takes data. But the screening test is one division and one comparison: your assessed dollars per square foot, against comparable properties on the same public roll. Here is how to read that signal, with a fully worked illustrative example.
The one number: assessed $/SF
Divide the assessed value on your notice by your building’s square footage. That unit value is the yardstick Texas equity law itself uses: Tax Code §41.43(b)(3) tests a property against the median of comparable properties, appropriately adjusted — and for buildings, the comparison runs on assessed $/SF. A property whose unit value sits well above the median of same-class, same-submarket comparables can appear over-assessed on the equity ground.
The signals worth checking, in order:
Screening signals
| Signal | How to check it |
|---|---|
| Your $/SF vs. the comparable median | Compare your assessed $/SF against properties of the same class code and submarket, in a similar size and age band, on the county's public roll. Above the adjusted median is the equity signal. |
| Similar buildings nearby carry lower $/SF | Same street or submarket, same use, similar vintage — if their roll values imply visibly lower unit values than yours, the comparison deserves the full adjusted-median treatment. |
| The gap clears a practical gate | Any above-median value can be protested, but a gap on the order of ten percent or more is the practical screening gate that usually makes the exercise worthwhile. |
| It's protest season | Values reset every January 1 and the filing window closes fast — May 15 or 30 days after your notice, whichever is later (Tax Code §41.44). A clean signal is only useful before the deadline. |
A worked example (illustrative)
Take a hypothetical 25,000 SF neighborhood retail strip in Fort Worth (Tarrant County), assessed at $4,260,000. Its unit value is $170.40/SF. Pulling 8 comparable properties of the same class and submarket from the public roll and applying documented size and age adjustments gives adjusted unit values like these:
Illustrative equity comparison — sample packet
| Comparable | Adjusted assessed $/SF |
|---|---|
| C-01 | $128.00 |
| C-02 | $133.50 |
| C-03 | $138.00 |
| C-04 | $141.00 |
| C-05 | $143.00 |
| C-06 | $149.50 |
| C-07 | $154.00 |
| C-08 | $161.00 |
| Median of comparables | $142.00/SF |
| Subject property | $170.40/SF |
Illustrative only — not a real parcel, not an appraisal, not a projection. The comparables and adjustments shown are a sample of the documented method described in the unequal-appraisal guide.
Reading the comparison:
What the example implies
| Line | Amount |
|---|---|
| Assessed value | $4,260,000 |
| Equitable-value estimate (median × building SF) | $3,550,000 |
| Apparent over-assessment | $710,000 (+16.7% of assessed value) |
| Annual tax effect at the sample's combined rate | ≈$17,040/yr |
Informational estimate computed from the illustrative sample above — not an appraisal, not tax advice, and not a promise of any reduction. A real comparison runs on your parcel's actual roll data.
What the signal does — and doesn't — mean
A unit value above the comparable median means the equity math looks worth checking properly; it does not mean a protest will succeed. The district can answer with its own comparables and adjustments, and the Appraisal Review Board decides. What the signal does give you is a decision made on evidence rather than instinct — including the decision not to file when your property sits at or below the median. The filing mechanics, from Form 50-132 to the hearing, are covered in the self-file protest guide.
To run this screening shape on your own numbers, the free estimator on the homepage takes an assessed value, a building size, an asset class, and a county — and returns an illustrative, informational estimate in about a minute.
Questions owners ask
What is the quickest signal that a commercial property may be over-assessed?
Assessed value divided by building square footage, compared against comparable properties of the same class and submarket on the same public appraisal roll. If your $/SF sits well above the median of genuinely comparable properties, the property can appear over-assessed on the Texas equity ground (Tax Code §41.43(b)(3)).
How big does the gap have to be before it matters?
There is no statutory threshold for the §41.43(b)(3) protest ground itself — any value above the adjusted comparable median can be protested. As a practical screening gate, a gap on the order of ten percent or more is what typically makes the exercise worth an owner's time; small gaps are easier for a district to rebut with its own adjustments.
If my $/SF is above the median, does that mean my protest will succeed?
No. An above-median unit value is a screening signal, not an outcome. The district can rebut with its own comparables and adjustments, and the review board weighs both sides. No result is ever promised — the signal only tells you the equity math looks worth checking properly.
Where do the comparison numbers come from?
The county's own public appraisal roll. Texas appraisal districts publish assessed values, building areas, class codes, and submarket codes in bulk, so a $/SF comparison can be built and independently re-checked by anyone — including the district — without any private data.
Is the worked example on this page a real property?
No. It is an illustrative sample — a hypothetical 25,000 SF retail strip used consistently across this site to show the arithmetic's shape. It is an informational estimate, not an appraisal, and not a projection of any outcome for any real parcel.
Check a real parcel.
The free estimator on the homepage runs the same $/SF-versus-comparables shape on your numbers — an illustrative, informational estimate, in about a minute.
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