Episode 197

Why Online Home Values Can Differ by 30% or More

Hosted by Buddy Blake, Buddy Blake Real Estate
Sep 16, 2026🎧 00:06:51 listen
Cover for Why Online Home Values Can Differ by 30% or More

🎧 Listen to this Episode

Online home valuation tools like Zillow's Zestimate can differ by 30-40% for the same property because they're algorithms that often react to listing prices rather than actual market conditions. Real estate expert Buddy Blake explains why automated valuations shouldn't be used as the sole basis for setting home prices and introduces FreeHouseValue.com, a free tool that aggregates valuations from up to 12 different sources to reveal the reality of these discrepancies.

🔑 Key Takeaways

  • Automated valuation models (AVMs) frequently adjust their estimates based on listing prices rather than independently assessing true home value, creating circular logic that can inflate or deflate estimates by 30-40%.
  • Online valuation algorithms lack local market knowledge and cannot account for property-specific upgrades, renovations, or neighborhood nuances that experienced agents understand through years of market activity.
  • Homeowners should never rely on a single online valuation tool to set their asking price; consulting a knowledgeable local agent or hiring a professional appraiser provides more accurate, defensible valuations.
  • FreeHouseValue.com aggregates valuations from multiple sources to show homeowners the spread in estimates, helping them understand that no single algorithm should dictate pricing decisions.
  • With only 4 million home sales in 2024 (the lowest since 1995), having an experienced agent navigating a difficult market is more valuable than ever for buyers and sellers.

📋 Episode Chapters

0:00Why Online Home Values Differ Dramatically
0:33Real Case Study: $360K to $550K Zestimate Jump
1:07How Algorithms Follow Listing Prices, Not Market Reality
1:38Why Experience Beats Automated Valuation Models
2:25Building a Free Multi-Source Valuation Tool
3:07How FreeHouseValue.com Works and What It Reveals
4:14Why You Shouldn't Rely on One Valuation Algorithm
5:08Testing the Tool and Making Better Home Decisions
A homeowner’s online estimate appeared to jump after the property was listed far above its earlier value. Here is why automated valuations can disagree—and why sellers should never let one algorithm set their asking price.

Episode Summary

Have you ever wondered why, depending on what online home valuation tool you're using, your numbers can be so different? And, you know, to give you an example, I was talking with somebody that called a few nights ago. They've got their house listed with somebody else, and of course I can't help them much, but they were just asking me, and if they call me and ask me, I can answer some questions. And I told them that, you know, they asked me about their house price, and I said, Well, I mean, I think your house is tremendously overpriced, and you came on the market way overpriced. And, you know, I gave her a demonstration, like for instance, when you look at Zillow, which is just one of many, many of what they call AVMs, which is automatic valuation tools online that creates values, and different banks and different lenders and different insurance companies use them for different reasons. And you really have to take them for a grain of salt because they haven't seen your house. They don't know the unique details about your house. They don't know anything about the upgrades. They don't know anything about the additions. They just don't know. And it's just so magical and interesting how a house in, let's just call it May, can go from a Zillow value, a Zestimate value of $360,000, and the people decide to list it for, let's just call it $550,000. All of a sudden, within like three days, the Zestimate jumps to very close to five hundred and some thousand dollars. And then an awful lot of the other ones jump it. So I decided to take a tool that a friend of mine has been building and we've been working on, and we've kind of put it on pause just because we were going to, you know, build it, sell it as a SaaS platform and, you know, sell it for money to somebody to hopefully buy it. But what we realized is there's so many systems out there that are giving home values and so many different agents and everything else asking customers, Hey, you want to see your home value? So we could collect their data and get their information and call them and hopefully talk them into listing their house with us. Well, I said, Okay, well, I'm just curious, you know, let's just take some of the major portals and what do they look like? What does it look like? What does the spread look like? So what we did is we took, since it was doing nothing else, we're not monetizing it, we're not selling it, we're not doing advertising on it, we're not renting it out, pretty much other than a couple of friends of mine that I'm letting use it, and one's in Sarasota and one is in Tennessee—and I'm sorry, Texas—and because they were interested and they use our content building system that we built for a website provider that we commonly use, that we had hoped that we could integrate with, but they decided to go with a different company, which is okay. We get that. And I think there's going to be In the real estate industry and a lot of industries, with all the AI and everybody doing all these different tools, and I mean, you can create some stuff. I mean, for the last probably three weeks, I've gone down a rabbit hole of creating some really incredible tools. But, you know, my wife had to sit me down and kind of do a realistic look because she was right. I was spending so much time building all these tools, I wasn't doing my job of, A, taking care of my customers. And keep in mind, I'm a real estate team leader, and I have three customers. I have buyers, I have sellers, and I have agents. And, you know, my job is to be communicating with them, helping them sell their houses, helping them buy a house, and mostly helping them navigate the market conditions that we're in. You'll saw a blog post that I created about an Anaconda market, which has actually come from a podcast that I heard from Brian Buffini. And you can see it on my website. You can see it in previous posts, and it's worth a listen to. I don't care if you're where you're at in the market, whether you're in the business or not in the business, because I think it's true. But, so we go at it and, you know, this is kind of the last thing I did because we're not doing anything else with this website, so I just put it on it. And all of a sudden, I don't know why, I don't know how, but we're getting dozens and dozens of ChatGPT and Claude people from those websites come in and type their home addresses so they can see the different valuations. We're not spending money, we're not running ads, we're not even marketing it. This is the only thing I've done to even talk about it. People don't know it's there, and it's actually part of the system we built to build some very deep SEO. EOA, IO, and all the schemas and JSONs and everything else that go into what it takes to get organic leads. Because we've all come to the, well, most of us have kind of hit the reality that Zillow and Google have such a tight relationship that, you know, as real estate agents, it's really difficult for us to, you know, get potential buyers or sellers off Google anymore. Because no matter what we do, Zillow has got it. You know, they're outspending us. They got more money. There's nothing we can do about it. And so they're going to get the, you know, 50, 60 percent of the cream of the crop. And no denying it, love or hate them, that's where the buyers are looking at houses. So what we said is, okay, we're not going to sell this thing. You know, pipe dream is you build this system, SaaS platform, you get a bunch of people to sign up, paying you hundreds of dollars a month, you get a revenue stream built, and then you sell it, and then you, you know, you move on. I've had one success story where I did that to some level, not enough to quit work over, certainly, to a friend of mine. And I've been involved with other real estate CRM and website platforms as one of their, you know, beta testers and help them kind of develop and give them some ideas on what we need because I'm in the trenches. You know, I still list and sell houses. I'm involved in hard transactions every day, and in today's market, everything's hard. It's about life change. It's divorce. It's people dying. It's people moving to be closer to kids or kids moving closer to parents or grandparents to take care of each other. Multigenerational, job losses, job transfers. It's just all kinds of things going on. It's such a weird market. But I've been doing it for 28 years, so anyway, I want to get back to the site. I want you to take a look at it because it is crazy. You enter your address, and it's going to pull up the automatic valuations on up to 12 if it'll pull it. Some of them it won't pull. In some areas, we don't have the access to the data because of the way they block it. Some areas we do. It uses a lot of public record data. It uses a lot of different systems, but it includes Zillow and Realtor.com and a lot of the major portals out there. But I think it's 12 maximum, but you'll probably see somewhere between 8 and 12. And you can see variances in these models of 30, 40 percent in prices. And it is scary to think that people are actually pricing their house based on these things. When you price your house, you need to be talking to a real estate agent that is—now, I'm going to say this, and no offense against new agents, but no brand new agents have very little business listing houses, in my opinion, because this is a market where it is hard and it takes a lot of experience to get through deals and get them closed. And usually that means you've messed up many times in the past and you've learned from it. And I don't mean disrespect, but this is just not that kind of market. And so you need to get with that. Or if you don't want to trust a real estate agent and you want to go it alone, go for sale by owner, do whatever you want to do, you know, get an appraiser. I think you're going to be shocked because most sellers don't understand what's really going on in the market. I mean, this year, and you can read it, you can listen to it in the podcast, this year there's going to be 4 million home sales in the United States, roughly. That's the least amount since 1995. And think about it, there is 80 million more people in the country. So we've never—I usually, when the market goes down, I thrive in my business because we offer a guaranteed sale program where we'll actually buy your house if we don't sell it for a certain price. And that price, you know, quite honestly, is a price that I can buy it for, clean it up, fix it up, flip it and sell it and make a profit. If you can't do it yourself, but we recommend you put it on the market retail and do the fix-ups yourself, or sometimes we even loan you the money and then get paid back at closing to fix it up yourself to help you out. But usually, when you have a market that slows down, I mean, I've been doing this a long time, I'll carry 50 to 150 listings. I mean, we're lucky to get more than six or eight or 10 listed right now because people are rate locked. They're sitting on low rates. They can't afford to leave their rates. So all you've got now, like in our area, is mostly national home builders. They're all in-house. They won't list with agents, so they got their own teams. So that kind of leaves us out doing different things. So we're having to work a lot harder. But really, the reason I wanted to have this conversation, I want you to take a look at this site. It's freehousevalue.com. It is something I threw together, vibe coding it's called. It's AI coding using all four different AI engines. A friend of mine had been building a much deeper system, but the market conditions just wasn't right for it to go any further. And the data feeds that it costs to maintain it aren't right. But, you know, we'll see what happens down the road. We'll see, because it's a great domain. It's a very expensive domain, freehousevalue.com. And if somebody really wants it, I'll sell it, and I'll split it with my friend and my partner on that. But, you know, right now we're just using it to kind of show people to be very careful. And I'm not demeaning these systems. I just want people to see the crazy swings. I mean, it is crazy. Try it out. You got no worries about getting beat to death. You can try it out, test it out, let me know what you think. We're not going to hammer you over the head. And you can try it anywhere in the country. It works everywhere. So just go to freehousevalue.com and give me some feedback on it. So thanks a lot.

Show Notes

🎙️ Real Stories with Buddy Blake — Episode Why Online Home Values Can Differ by 30% or More A homeowner’s online estimate appeared to jump after the property was listed far above its earlier value. Here is why automated valuations can disagree—and why sellers should never let one algorithm set their asking price. ━━━━━━━━━━━━━━━━━━━━━━ About Your Host Buddy Blake, Buddy Blake Real Estate 📍 Wilmington, NC 📞 (910) 395-1000 ✉️ buddy@buddyblake.com 📱 Follow & Connect: • YouTube: https://www.youtube.com/@buddyblakenc • Facebook: https://www.facebook.com/buddyblakedotcom 📎 Resources & Links 📖 Read the full blog post: https://www.buddytheblogger.com/r/VksGFcXW 🌐 Website: https://buddyblake.com 💼 Free Home Value - No Registration Rquired: https://expresshomesale.com ━━━━━━━━━━━━━━━━━━━━━━ 🏠 FREE HOME VALUE ESTIMATE Curious what your home is worth? Get a free instant estimate. https://www.expresshomesale.com/sell 📊 COST OF WAITING CALCULATOR See what waiting could cost you — the real numbers. https://expresshomesale.com ━━━━━━━━━━━━━━━━━━━━━━ ⚖️ Equal Housing Opportunity Powered by https://buddyblake.com 🚀 Amplify YOUR content with AI — Learn more at https://reiosai.com
📝 Full Episode Transcript

Full Episode Transcript: Why Online Home Values Can Differ by 30% or More

This is the complete, auto-generated transcript of the episode. Timestamps are provided for quick reference.

0:00Welcome to Real Stories with Buddy Blake. Today's episode features real estate insights from Buddy Blake Real Estate. Welcome back to Real Stories with Buddy Blake. Today we're diving into something that honestly blows my mind every time I think about it. Why your house's estimated value can swing wildly depending on which website you're looking at. Like, we're talking 30, 40 percent differences sometimes. Buddy, you've got some wild stories about this.

0:33Yeah, so I had someone call me the other night, right? They had their house listed with another agent and they asked me what I thought about their price. And I told them straight up, I think you're tremendously overpriced. And here's the thing that really gets me. When they first listed, their Zillow Zestimate was sitting at $360,000. Then they list it for $550,000 and boom, within three days, that Zestimate jumps to almost $550,000. It's like the algorithm just follows the listing price instead of actually valuing the house.

1:07Wait, so the algorithm is reacting to the listing price, not the other way around? That's kind of backwards, isn't it? Exactly. And then all the other AVMs, that's automatic valuation models, they jump up too. Look, these systems, they haven't actually seen your house. They don't know about your upgrades, your additions, the unique details. They're just pulling data and spitting out numbers. And people are making huge decisions based on these things, which is crazy to me.

1:38So, that's the real problem here. People are actually pricing their homes based on what these online tools tell them. Yes, and it's scary. I mean, I've been doing this for 28 years and I've learned the hard way that you need someone who actually understands your local market, who's been through deals, who's made mistakes and learned from them. A brand new agent, honestly, I don't think they should be listing houses in a market like this. This market is hard. It takes experience.

2:09We're looking at roughly 4 million home sales this year in the United States, the lowest since 1995. And there's 80 million more people in the country than there were back then. So, something's definitely off. Okay. So, you decided to actually build something to show people how crazy these differences are. Tell me about that.

2:31So, I had a friend who was building this deeper valuation system and we were thinking about turning it into a SaaS platform, selling it to people monthly. But honestly, market conditions just weren't right. And the data feeds are expensive to maintain. My wife actually had to sit me down and tell me I was spending too much time building tools instead of actually taking care of my customers, my buyers, my sellers, and my agents. She was right.

2:59That's real talk. So, what did you end up doing with it? We decided, you know what, let's just put this on the website and show people the craziness. We built it using AI coding, using four different AI engines. And we threw it on a site called freehousevalue.com. You enter your address and it pulls up automatic valuations from up to 12 different sources. You'll probably see between 8 and 12, depending on the area and whether we have access to the data. And you can see the spreads, sometimes 30, 40%

3:32differences in the same house. And you're not even marketing this thing? Like you're not running ads or anything? Not at all. We're literally just letting it sit there. And somehow, ChatGPT and Claude users are finding it and typing in their addresses to see the valuations. We built it with really deep SEO, all the schemas, the JSON structures, everything that goes into organic lead generation.

4:02Because honestly, Zillow and Google have such a tight relationship that as agents, we can't really compete with them on search anymore. They've got the money, they've got the scale. So, we're trying a different approach. So, this is really more of a reality check for people, right? Like, don't just trust one number.

4:20Exactly. I'm not trying to demean these systems, Zillow, Realtor.com, all of them. They serve a purpose. But people need to understand that these are just algorithms. They're not a substitute for talking to an actual agent who knows your neighborhood, who's done transactions in your area, who understands what's really happening in the market right now. And if you don't want to work with an agent, fine, get an appraiser. I think you'll be shocked at what you find.

4:49So, for anyone listening, you're saying go check out freehousevalue.com, type in your address and just see what the spread looks like. Yeah, go ahead. Try it out. Anywhere in the country. It works everywhere. No worries about getting hammered with calls or ads. Just test it out and let me know what you think. See the crazy swings for yourself. That's really the point.

5:12I love that you're just putting this out there for people to learn. Buddy, thanks so much for breaking this down. This is the kind of real world stuff that actually helps people make better decisions about their homes. Thanks for having me. And hey, if you've got questions or feedback on the tool, just reach out. We're always learning, and I'd love to hear what people find when they test it out.

5:35Thanks for listening to Real Stories with Buddy Blake. For more episodes and to learn more, check the show notes.

❓ Frequently Asked Questions

Why do online home value estimates differ so much between Zillow, Redfin, and other websites?

Online valuation algorithms use different data sources, weighting methods, and algorithms to estimate home values. More significantly, many systems like Zillow's Zestimate adjust their estimates based on actual listing prices rather than independently assessing market conditions, causing differences of 30-40% or more for the same property.

Does Zillow Zestimate account for home renovations and upgrades?

No. Zillow and other automated valuation models pull historical data and comparable sales but cannot see inside your home or assess specific upgrades and renovations you've made. They lack the local knowledge and property-specific details that professional appraisers and experienced real estate agents use to determine accurate value.

Should I use online home value estimates to set my listing price?

No. You should not rely on a single online valuation tool to set your asking price. Instead, consult with an experienced local real estate agent who understands your specific market, has completed recent transactions in your area, or hire a professional appraiser for an independent, defensible valuation.

What is FreeHouseValue.com and how does it work?

FreeHouseValue.com is a free tool that aggregates automated valuations from up to 12 different sources for a single property address. It allows homeowners to see the spread in valuations across multiple platforms, revealing how dramatically estimates can differ and why relying on any single algorithm is unreliable.

Why is having an experienced real estate agent important in today's housing market?

With only 4 million home sales in 2024—the lowest since 1995—the market is challenging and requires expertise. Experienced agents understand local market conditions, have made and learned from past mistakes, and can navigate pricing, negotiations, and timing far better than algorithms or new agents can.

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Buddy Blake Real EstateWilmington, NC

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