Which Home Value Estimator Is Most Accurate for Chicago Homes?

No public home value estimator is accurate enough to price a Chicago home that is not currently listed for sale, and the clearest evidence of that comes from the estimators themselves. The JProctor Group checks estimator values against real sale outcomes at listing appointments, and the pattern matches what the vendors publish about their own models. Zillow puts the median error on an off-market Chicago Zestimate at 6.98%, with 38.57% of them landing within 5% of the eventual sale price, measured across 3.3 million homes. Redfin reports a 7.55% median error on off-market homes nationally. Both models get far closer once a home is listed, because a list price is itself a signal they can read. This guide covers what each estimator publishes about its own accuracy as of October 2026, why Zillow and Trulia return the same number, and how to use an estimate without letting it set your asking price.

Which home value estimator is most accurate for Chicago homes?

For a home already listed for sale, the Zestimate and the Redfin Estimate are close enough that the difference does not matter. In the tables both companies published as of October 2026, Zillow reports a 1.87% median error across 45.5 thousand on-market Chicago homes and Redfin reports 1.91% nationally across 3,363,948 on-market estimates. Either will land within about 2% of the sale price half the time.

For a home that is not listed, which is the situation almost every homeowner is in when they look up a value, the picture changes completely. In the same October 2026 tables, Zillow's off-market Chicago median error is 6.98% and Redfin's off-market national median error is 7.55%. On our calculation, Zillow's Chicago off-market error is 3.7 times its Chicago on-market error.

So the honest ranking is that the most accurate estimator is whichever one is looking at a home that is already on the market. Between the two vendors, Zillow's published Chicago off-market figure is slightly better than Redfin's published national one, but the gap between them is small next to the gap between their own on-market and off-market numbers.

How accurate is the Zestimate on a Chicago home?

Zillow publishes Chicago figures separately from its national ones, and the local numbers are worth reading in full. As of October 2026, across 3.3 million off-market Chicago homes, 38.57% of Zestimates came within 5% of the eventual sale price, 63.55% came within 10%, and 84.92% came within 20%.

Read the last figure the other way. On our calculation from Zillow's October 2026 Chicago table, 15.08% of off-market Chicago Zestimates fall outside 20% of the sale price, which is about one home in seven. On a $600,000 house, a 20% miss is $120,000.

Zillow is explicit about the method behind these numbers, which is unusual and to its credit. For off-market homes it compares the Zestimate generated before a sale with the final recorded sale price, and includes only homes that eventually sell. Homes that never sell are not in the sample, so the published accuracy describes the subset of properties that found a buyer.

Is the Redfin Estimate more accurate than the Zestimate?

Not meaningfully, on either side of the on-market line. As of October 2026, Redfin publishes a 1.91% median error for homes that are for sale and 7.55% for off-market homes, against Zillow's 1.77% and 7.20% nationwide. Those are different companies measuring different housing samples with different methods, so a 0.14-point or 0.35-point difference is not a reliable ranking.

Redfin's off-market distribution tells the same story as Zillow's. In its October 2026 table, across 135,462,849 off-market estimates, 36.36% came within 5% of the sale price, 59.99% within 10%, and 81.72% within 20%. That leaves 18.28% outside 20% on our calculation, or roughly one in five.

One difference matters for a Chicago reader. Redfin's published accuracy table runs alphabetically by state and its public view does not reach Illinois, so there is no Illinois or Chicago breakout to compare against Zillow's metro-level numbers. The Redfin figures quoted here are national, and that is a limitation of the published data rather than a judgment about the model.

Is Trulia's estimate different from Zillow's?

No, and this is the single most useful thing to know before comparing estimators. Trulia's own support page states that as Trulia is part of Zillow Group, the Trulia Estimate is now derived from the Zestimate. Checking Zillow against Trulia is checking a number against itself.

Trulia's page is also direct about what the figure is for. It says the Trulia Estimate is not an appraisal and should be used as a starting point, and recommends supplementing it with a visit to the home, a professional appraisal, or a comparative market analysis from an agent. That is the vendor's own guidance, not a competing view from a broker.

How do the estimators compare on published accuracy?

Estimator	Median error, on-market	Median error, off-market	Off-market within 5%	Off-market within 20%
Zestimate, Chicago metro	1.87%	6.98%	38.57%	84.92%
Zestimate, nationwide	1.77%	7.20%	not published nationally	not published nationally
Redfin Estimate, nationwide	1.91%	7.55%	36.36%	81.72%
Trulia Estimate	derived from the Zestimate	derived from the Zestimate	derived from the Zestimate	derived from the Zestimate

Sources: all figures retrieved October 29, 2026. Zestimate figures from Zillow's published accuracy tables for 2026; Redfin Estimate figures from Redfin's published accuracy tables for 2026; the Trulia row from Trulia's own support documentation. Zillow publishes within-5% and within-20% distributions by metro rather than nationally, which is why those two cells are marked not published. Redfin publishes by state and its public table does not reach Illinois, so its rows are national.

Why are estimators so much less accurate on homes that are not for sale?

Because the models lose their best input the moment a home leaves the market. Zillow states that on-market data includes listing price, description, comparable homes and days on the market, while off-market data is limited to tax assessments, prior sales and other public records.

A list price is a human judgment about a specific property, made by people who have stood inside it. When an estimator can see that number it is partly grading a conclusion someone else reached, which is why the on-market median error falls under 2% in both vendors' October 2026 tables. Take it away and the model is working from the county's record of square footage, bedroom count and the last sale, which is a thin description of a house.

That is also why the error is not random. Public records do not know about a gut renovation, a new kitchen, a failing roof, a lot that backs onto a rail line, or a unit with the only private terrace in the building. Those are exactly the features that move a Chicago price the most.

What does a Chicago broker see that an estimator does not?

Jeff Proctor has described the gap on camera, and his account lines up with the vendors' published numbers. In a video published on our home valuation page in November 2024, he puts it this way:

A Zestimate isn't always right. In my experience it's usually somewhere from about 20% below to 20% above the real number, so some people get false hopes about their price. (Jeff Proctor, November 2024)

I can tell you personally: the Zestimate on my own current house is probably about 30% below its actual true value. (Jeff Proctor, November 2024)

That is his stated experience rather than a measurement, but it is worth setting beside Zillow's October 2026 Chicago table, where 15.08% of off-market Zestimates fall outside a 20% band on our calculation from the 84.92% within-20% figure. An agent who saw a 20% spread in practice in 2024 and a vendor reporting roughly one home in seven outside 20% in 2026 are describing the same distribution from opposite ends.

The practical difference is condition, competition and the specific block. A pricing review starts from recent comparable sales, then adjusts for what the model cannot see, then looks at what a buyer could choose instead of your home this week. Our guide to what living in Chicago actually costs a buyer covers the carrying-cost side of the same question, and the current Chicago real estate market trends show the inventory a seller is competing with.

How should a Chicago homeowner use an estimator?

Use it as a range, not a number, and never as an asking price. Four steps keep it useful:

1. Check whether the figure you are reading is an on-market or off-market estimate. If your home is not listed, you are reading the off-market model, where Zillow's Chicago median error was 6.98% as of October 2026.
2. Correct your home's facts with the vendor and with the county. Zillow states that unreported additions, updates and remodels are not reflected in the Zestimate, so a renovation the assessor never recorded is invisible to it.
3. Treat the two numbers as one. Since the Trulia Estimate is derived from the Zestimate, a second opinion means Redfin, an appraisal, or an agent, not Trulia.
4. Get a property-specific review before you set a price. If you are preparing to sell, our guide to selling a home in Lincoln Park walks through how pricing and competition interact in practice.

What else do homeowners ask about home value estimators?

Which home value estimator is most accurate?

For homes already listed for sale the two leading estimators are close: Zillow reports a 1.77% nationwide median error and Redfin reports 1.91%, both as published in 2026. For off-market homes, which is what a homeowner usually sees, Zillow's nationwide median error is 7.20% and Redfin's is 7.55%. The difference between the two vendors is far smaller than the difference between their own on-market and off-market accuracy.

How accurate is Zillow for Chicago homes?

Zillow publishes Chicago separately. For off-market Chicago homes the median Zestimate error is 6.98%, with 38.57% within 5% of the eventual sale price and 84.92% within 20%, measured across 3.3 million homes in 2026. For Chicago homes already on the market the median error falls to 1.87% across 45.5 thousand homes. On our calculation that leaves about one off-market Chicago Zestimate in seven outside a 20% band.

Is Redfin or Zillow more accurate?

Neither, to any degree a seller should act on. Redfin publishes a 1.91% on-market and 7.55% off-market median error against Zillow's 1.77% and 7.20% nationwide, both as of 2026. The two companies measure different samples with different methods, so differences of a few tenths of a point are not a ranking. Redfin's public accuracy table also does not break out Illinois, so there is no local comparison to make.

Does Trulia use the Zestimate?

Yes. Trulia's support page states that as Trulia is part of Zillow Group, the Trulia Estimate is now derived from the Zestimate, documentation retrieved October 29, 2026. Comparing a Trulia Estimate with a Zestimate is comparing a number with itself, so a genuine second opinion has to come from Redfin, a licensed appraiser, or an agent's comparative market analysis.

Why is my Zestimate so far off?

Most often because your home is off-market and the model cannot see what makes it different. Zillow states that off-market estimates draw only on tax assessments, prior sales and other public records, while on-market estimates add the listing price, description, comparable homes and days on market. Zillow also states that unreported additions, updates and remodels are not reflected in the Zestimate, so a renovation the county never recorded is invisible to it.

Can I use a Zestimate to set my asking price?

No, and the vendors say so themselves. Trulia's support page states its estimate is not an appraisal and should be used as a starting point, recommending a visit to the home, a professional appraisal, or a comparative market analysis instead. With 15.08% of off-market Chicago Zestimates falling outside 20% of the sale price on our calculation from Zillow's 2026 table, an estimate used as an asking price can be six figures wrong on a Chicago house.

What does Jeff Proctor say about Zestimates?

In a video published on the JProctor Group home valuation page in November 2024, Jeff Proctor says a Zestimate is "usually somewhere from about 20% below to 20% above the real number" in his experience, and that the Zestimate on his own house is "probably about 30% below its actual true value." That is his stated experience rather than a measurement, and it sits close to Zillow's published Chicago distribution, where 84.92% of off-market Zestimates fall within 20% of the sale price.

Want a number you can actually price against?

An estimator cannot walk your block. Call Jeff Proctor at (773) 517-6026 or request a pricing review from the JProctor Group and you will get recent comparable sales for your price band, an adjustment for condition and finishes the public record does not hold, and a read on the homes a buyer could choose instead of yours this week. The team works both the city and the western suburbs from offices in Chicago and St. Charles.