FAQ
Can I just look at Zillow's Zestimate for my home?
Quick Answer
You can look at it, but you shouldn't rely on it. A Zestimate is a computer-generated guess built from public records and recent sales data — it has never seen the inside of your home, doesn't know about your finished basement or outdated kitchen, and tends to be less accurate in a place like Woodbury where lot sizes, home ages, and floor plans vary widely block to block. A local comparative market analysis (CMA), built by a human who actually looks at comparable homes and adjusts for your home's specific features, will almost always get you closer to a realistic listing price.
Key Takeaways
- A Zestimate is an automated valuation model (AVM) — it's generated by software analyzing public data, not a person who has seen your home.
- AVMs don't know about interior condition, finished square footage that isn't on record, recent renovations, or deferred maintenance.
- Zillow itself publishes a median error rate for Zestimates, and that error is typically wider for off-market homes than for homes currently listed for sale.
- Woodbury's mix of home ages, lot sizes, and architectural styles makes algorithmic valuation harder than it is in a subdivision of nearly identical homes.
- A CMA prepared by a local agent adjusts for the specific features and comparable sales an algorithm can't weigh correctly.
- The Zestimate is a fine conversation starter with your agent, but it shouldn't be the number you use to set your list price.
Almost every seller I talk to has already checked their Zestimate before we sit down together, and that's not a bad instinct — it's free, it's fast, and it gives you a number to anchor on. The problem isn't that sellers look at it. It's when that number quietly becomes the plan, instead of a starting point for a real conversation.
What a Zestimate Actually Is
A Zestimate is what's known as an automated valuation model, or AVM. It's a piece of software that estimates a home's value by running public records data — past sale prices, tax assessments, square footage on file, number of bedrooms and bathrooms — through a statistical model trained on recent comparable sales in the area. There's no person involved in generating the number for any individual home, and nobody from Zillow has walked through your house.
That's a meaningful distinction, because it means the model is working entirely from what's recorded somewhere, not from what's actually true today. If your basement was finished five years ago but the county's records were never updated, the Zestimate doesn't know your basement is finished. If you replaced the roof, updated the kitchen, or converted a three-season porch into year-round living space, none of that shows up unless it happened to trigger a permit that flowed back into public data — and even then, AVMs are inconsistent about picking it up.
It's a model, not an opinion
An AVM doesn't have an opinion about your home. It has a formula. The formula is often pretty good at the neighborhood level and considerably shakier at the individual-home level, which is exactly the level that matters when you're setting a list price.
Why the Error Rate Matters More Than the Number Itself
Zillow has been fairly transparent over the years about the fact that Zestimates carry a published median error rate, and that error tends to be tighter for homes actively listed for sale (where the model has fresher, more direct signals) than for off-market homes being valued purely from historical data. In practical terms: the Zestimate on a home that isn't for sale yet — which describes most sellers checking their own home's value before listing — is the version of the estimate with the least to go on.
A few percentage points of error sounds small until you translate it into dollars. On a home worth several hundred thousand dollars, even a modest error rate can mean tens of thousands of dollars of daylight between the Zestimate and what the home would actually sell for. That gap can cut either way — sometimes the algorithm undervalues a well-maintained home, and sometimes it overvalues one that needs work the model has no way of detecting.
Why This Is a Bigger Issue in Woodbury Specifically
AVMs perform best in areas with high housing uniformity — think a subdivision built in one phase, with a handful of repeated floor plans and similar lot sizes. The model has lots of near-identical comparables to lean on, so its guesses tend to land closer to reality.
Woodbury doesn't look like that. The city spans decades of development, from older established neighborhoods to newer construction, with lot sizes, architectural styles, and finish levels that vary considerably even within the same general area. That variety is part of what makes Woodbury a good place to live, but it's also exactly the condition that makes algorithmic valuation harder. A model that's mostly comparing your home to nearby sales may be pulling from properties that look similar on paper but differ in size, age, or lot characteristics in ways that meaningfully affect value.
Dave's Local Insight
I've pulled up the Zestimate next to my own CMA for the same house more times than I can count, and in Woodbury the two numbers frequently land tens of thousands of dollars apart — sometimes higher, sometimes lower. It's rarely because the algorithm is "wrong" in some obvious way. It's because it can't see the things that actually separate one Woodbury home from the one two doors down.
Zestimate vs. CMA: What Each One Is Actually Doing
| Zestimate (AVM) | CMA (Comparative Market Analysis) |
|---|---|
| Generated by software from public data | Prepared by a local agent who reviews the comps directly |
| No one has seen the inside of your home | Typically involves an in-person or video walkthrough |
| Can't account for unrecorded updates or deferred maintenance | Adjusts for condition, upgrades, and specific features |
| Applies a general model across many home types | Selects comparables based on true similarity — style, lot, condition |
| Updated automatically, sometimes on a lag | Reflects current market conditions and active competition |
| Free and instant | Usually free from a listing agent, takes a bit of preparation time |
So What Should You Actually Do With the Zestimate
None of this means the number is useless. It's a reasonable ballpark, a way to sanity-check other estimates, and a fine icebreaker when you're starting to think about selling. The mistake isn't looking at it — it's treating it as a finished answer instead of one data point among several.
A more complete way to figure out what your home is worth
- Note the Zestimate as one reference point, not your list price
- Ask a local agent for a CMA that pulls truly comparable, recently sold and active homes near you
- Walk your agent through updates, renovations, and condition items that public records wouldn't show
- Compare the CMA's comparables against your home on lot size, style, and finish level — not just square footage and bedroom count
- If you're refinancing or need a defensible number for lending purposes, ask about a licensed appraisal instead
- Revisit your pricing conversation as new comparable sales close, since both AVMs and CMAs are only as good as the data feeding them
Don't anchor your list price to an AVM
Pricing a home based on a Zestimate — either too high because the algorithm inflated it, or too low because it missed your recent updates — can cost you real money, either through a stale listing that sits too long or an offer left on the table. A CMA is the tool built specifically to avoid that.
The Bottom Line
A Zestimate is a computer's best guess from a distance. It's a reasonable starting point precisely because it's instant and free, but it was never designed to replace the judgment of someone who can actually walk your home, compare it to what's truly similar nearby, and account for the details that make your property different from the one down the street. Use it to get curious about your home's value — then get a real CMA before you use any number to set a price.
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Written by Dave Brown
REALTOR®, LPT Realty
Dave Brown is a REALTOR® with LPT Realty who has spent his career helping families buy, sell, and settle into life in Woodbury, Minnesota and the surrounding East Metro. He writes Woodbury Living as a local resource first and a business second — every guide is meant to leave you better informed, whether or not you ever work together.
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