Why Is the Zillow Estimate on My El Paso Home Wrong?
Why is the Zillow estimate on my El Paso home wrong?
Short version: because Texas does not tell it what homes actually sold for.
In most states, when a home closes, the sale price is recorded with the county and becomes public record. Anybody can look it up, including a computer. That river of closed sale data is what an automated valuation model runs on.
Texas is a non-disclosure state. Sale prices are not public record here. There is no county filing that says this house sold for $287,000 last March. That number exists in the MLS and in the closing file, and that is about it.
So an automated estimate on an El Paso home is doing something much harder than an estimate on a home in Denver. It is inferring value without the thing value is measured by.
What the model uses instead, and why each substitute is weak
Three main things fill the hole, and all three have problems.
Tax assessed value. This is not market value and it was never meant to be. In Texas, homeowners actively protest their assessment every year specifically to keep that number down, and the whole system is built around caps and exemptions rather than around what somebody would pay. Using the tax roll as a stand-in for market value is like judging what a car is worth by what the owner told the insurance company.
Listing prices. What a home was asked is not what it got. A model that leans on asking prices in a market where homes negotiate is measuring optimism, not results.
Prior estimates and general trends. At some point the model is partly estimating from its own estimates, and the further it gets from real closed sales, the more that compounds.
Four things no estimate can see about your home
Even with perfect data, a model is looking at a spreadsheet. Here is what is not in it.
Condition. It does not know your kitchen was redone three years ago, and it does not know the roof is twenty-two years old. Two identical floor plans on the same street can be sixty thousand dollars apart, and the model shows you the same number for both.
View. On the West Side, a mountain view is one of the three things that actually moves a home. A model cannot see out your window.
What is behind you. Backing to open space instead of somebody's patio is worth real money here. That is not a field in any database.
Which side of an invisible line you are on. This is the El Paso one, and it is worse than people realize. The tax rate in this city changes across boundaries that do not follow roads. The Eastlake area is not Horizon City even though it shares a zip code. The city limit line runs straight through 79932. Two homes a few minutes apart, at the same price, can differ by three quarters of a percentage point in tax rate, which is a couple hundred dollars a month of difference in what it costs to own them. A model that treats those as comparable is comparing two different things.
We wrote both of those out in the Horizon and 79928 guide and the West Side guide, because they trip up human appraisers too.
Where are the estimates furthest off in El Paso?
Wherever there is the least to compare your home to. That is the pattern, and it follows directly from how the model works. Fewer closed sales nearby means more guessing, and more guessing means a wider miss.
Three kinds of homes in this city fit that description.
Homes on real land in the Upper Valley. In 79932 you can find a $215,000 house on a fifth of an acre and a $2.6 million house on nearly ten acres, some of them on septic and private wells, in the same zip code. There is no such thing as a routine comparable sale out there.
The Country Club area and anything in 79922. About three thousand homes total, most of them built in the 1960s, and sixty-nine homes built in that entire zip during the 1990s. You cannot build more of it, which is exactly why it holds value, and it is also why a model has almost nothing recent to work from.
New construction neighborhoods. This one is the opposite problem. Every floor plan looks the same to a model, so it treats the homes as interchangeable. They are not. Two houses with identical square footage on the same street can be forty thousand dollars apart in upgrades, and none of that shows up in the data.
What does a wrong estimate actually cost you?
It fails in two directions and both of them are expensive.
Too high, and you list off it. The home sits, buyers watch the days accumulate, and the first question every agent asks about a stale listing is what is wrong with it. You end up selling for less than you would have gotten with a correct price on day one, and it takes you three months longer to get there.
Too low, and you never call anybody. This one is quieter and it happens more. Somebody looks at a number, concludes they do not have enough equity to move, and stops thinking about it. They stay in a house that no longer fits for another four years, based on a number that was never meant to be accurate.
The second one is the one we see wreck more plans, because nobody ever finds out it was wrong.
So what is the estimate actually good for?
It is not useless, and we are not going to pretend it is.
It is a reasonable starting point if you have no idea at all and you want a number in your head before you talk to anybody.
It is decent at direction. If you watch it over a couple of years, the trend line tells you something even when the number does not.
It is helpful in a neighborhood you do not know. If you are moving here from out of state and you want a rough sense of what areas cost, it does that job fine.
What it is not is a number you should make a decision with. Not a listing price. Not a decision about whether you have enough equity to move (here is how to work out what you would actually walk away with). Not a negotiating position.
And here is the honest way to check our work. The companies that publish these estimates also publish their own accuracy data, usually as a median error rate, sometimes broken out by region. Go find that number before you trust the estimate on your home. They are not hiding it, and it is more persuasive coming from them than from us.
How do you get a real number?
Three options, and they are not the same thing.
A comparative market analysis from an agent. Somebody who works this market pulls the actual closed sales, adjusts for condition, view, lot and location, and gives you a range. Free, and it is what we do before we list anything. It is also what we do before we write an offer, because a number nobody checked is how buyers end up over-paying.
A licensed appraisal. You pay for it, usually a few hundred dollars, and you get an independent professional opinion. This is what a lender relies on, and it is the right move if you need a defensible number for something legal or financial.
Your own research. Look at what is actually selling near you, not what is listed. Asking prices tell you what sellers hope for. Closed sales tell you what happened.
If you want the first one, tell us the address and your agent will pull the comparable sales and send you a real number.
FAQ
Why is the Zillow estimate on my El Paso home wrong?
Texas is a non-disclosure state, which means sale prices are not public record. Automated valuation models were built for states where every closed sale is recorded and published, so in Texas they have to substitute tax assessments, listing prices and their own prior estimates. None of those measure what a home actually sold for.
Is Texas a non-disclosure state?
Yes. Sale prices are not filed with the county and are not public record. They live in the MLS and in the closing file. This is why online estimates are structurally weaker in Texas than in most of the country.
Are online home estimates accurate?
They publish their own accuracy data, usually as a median error rate, and it is worth looking up for your area before you rely on the number. They tend to be more accurate on homes that are currently listed and less accurate on homes that are not, and less accurate again where comparable sales are thin.
Why is the tax assessed value different from my home's value?
Because it was never meant to be the same thing. Assessed value drives your tax bill and is shaped by caps, exemptions and annual protests. Market value is what a buyer would actually pay. They move in the same general direction and they are not interchangeable.
Where are online estimates least accurate in El Paso?
Anywhere comparable sales are thin. That means acreage in the Upper Valley, the Country Club area where very little has been built in decades, and unique homes generally. New construction is the opposite problem: every home looks identical to a model, but upgrades can separate two of them by tens of thousands of dollars.
How do I find out what my El Paso home is really worth?
Get a comparative market analysis from an agent who works this market, which is free, or pay for a licensed appraisal if you need a defensible number. Either way, look at closed sales rather than asking prices.
Does the estimate affect what I can sell for?
Only if you let it. Buyers sometimes reference it, and a good agent can show them the actual comparable sales instead. Where it does real damage is when a seller prices off it, or decides not to move at all because the number told them they have no equity.
Thinking about selling? The complete guide to selling your home in El Paso covers what it costs and what you actually walk away with.
This page describes how automated valuation models generally work and why Texas non-disclosure affects them. It is not a statement about any specific company's methodology, which is theirs to publish and may change. Nothing here is an appraisal or a valuation of any particular property. For a defensible value on a specific home, use a licensed appraiser.