Why Two Identical Homes Can Have Different Appraisals — and What You Can Do About It

Mass Appraisal Is Not Precise

McLennan County has over 100,000 taxable properties. MCAD does not send an appraiser to walk through every home every year. They use a mass appraisal system — a statistical model that estimates property values based on characteristics like square footage, year built, neighborhood, and recent sales data.

Mass appraisal models are designed to be accurate on average across large groups of properties. They are not designed to be precise for any individual property. The model may get your neighborhood right while getting your specific block wrong. It may account for square footage accurately while misclassifying your home's condition. It may use sales data from a different part of the county that does not reflect your market.

The result is that two homes that are nearly identical on paper can end up with meaningfully different appraised values — not because of any deliberate decision, but because of how the model processes and weights different variables.

Why the Inconsistency Persists Year Over Year

Once a property is appraised at a certain value, that value becomes the baseline for future years. If your home was appraised higher than comparable properties in 2022, that higher baseline carries forward. Annual adjustments are applied as percentages — so a 10% increase applied to a higher base produces an even larger gap over time.

Homeowners who do not protest in the years when the gap first appears end up compounding the problem. By the time the difference is large enough to notice, the base value has been inflated for multiple years.

This is why the equal and uniform argument is so powerful for homeowners who have not protested in several years. The gap between your appraised value and comparable properties may be larger than you think — and you have a legal right to close it.

How to Find Out If Your Home Is Over-Appraised Relative to Comps

The data you need is public. MCAD publishes appraised values for every property in McLennan County. You can search for properties similar to yours — same neighborhood, similar square footage, similar year built — and compare their appraised values to yours.

What you are looking for is the median appraised value per square foot across a set of comparable properties. If your home's appraised value per square foot is significantly above that median, you have the foundation of an equal and uniform protest.

The challenge is doing this correctly. Selecting the right comps requires judgment — properties that are genuinely comparable, not just geographically close. Applying the right adjustments for differences in size, age, and condition requires understanding how MCAD's own model works. And presenting the analysis in a format the ARB panel will accept requires knowing what they expect to see.

The Market Alignment Study

A Market Alignment Study is a formal analysis that identifies where your appraised value sits relative to comparable properties in MCAD's own data. It selects the appropriate comps, calculates the median, applies standard adjustments, and produces a documented demand value — the number you are legally entitled to request based on equal and uniform treatment.

This is not an opinion of value. It is a mathematical analysis of MCAD's own records, showing that your home is appraised above the median of comparable properties. The ARB panel cannot dismiss it as subjective — it is built from the same data source they use.

What the Numbers Actually Look Like

In a typical McLennan County neighborhood, a homeowner with a $320,000 appraisal might find that the median appraised value per square foot across 15 comparable properties produces a demand value of $278,000. That is a $42,000 reduction — which at a 2.5% effective tax rate translates to approximately $1,050 in annual savings.

That savings compounds forward. A lower base value in 2026 means a lower starting point for 2027's increase. Over five years, the cumulative difference can easily exceed $5,000 — from a single protest that took less than two hours of your time.

The Homeowner's Advantage

The equal and uniform standard exists because the Texas Legislature recognized that mass appraisal systems produce inconsistent results — and that homeowners should not be penalized for those inconsistencies. The law explicitly shifts the burden of proof to the appraisal district in these cases.

You do not need to prove your home is worth less than the appraisal. You need to show that comparable homes are appraised lower. If you can show that, the district has to defend why your home should be treated differently. That is a position they frequently cannot defend when the data is presented correctly.

The homeowners who know this win more often. The homeowners who do not know this pay more than they should — every year.