By Eric Berman, REALTOR® | The Eric Berman Team at Compass
TL;DR:
Most sellers have looked up their home online and seen a Zestimate, and it's natural to wonder how close it is to reality. These automated estimates can be a useful starting reference, but leaning on them too heavily when selling on Long Island tends to produce pricing mistakes that cost a seller time, leverage, or money. The number is a conversation starter, not a valuation.
What a Zestimate Actually Is — and Isn't
A Zestimate is an automated valuation generated from public data and algorithms — tax records, prior sales, and broad market trends fed through a formula. Taken for what it is, it has real uses: it offers a quick general range, reflects the broad direction of a market over time, and gives a seller a place to begin the conversation. As a rough orientation, it's fine.
The trouble starts when it's asked to do more than it can. A Zestimate can't see inside a home, can't adjust for condition or layout or how the space actually flows, can't account for buyer psychology or a shift in demand, and can't read the micro-location differences that matter so much on Long Island. Those are precisely the factors that move a real sale price — which is why an automated number should inform a seller's thinking without ever driving the decision. For a fuller treatment of why these tools miss, the entry on how accurate online home value estimates really are is worth reading alongside this one.
Why Automated Values Struggle on Long Island
Long Island isn't a uniform market, and that's the heart of the problem for any algorithm. Two homes with nearly identical square footage can sell for dramatically different prices based on details a formula simply can't weigh. Renovation quality versus cosmetic updates, a functional layout versus an awkward addition, a home's placement on a quiet street versus a busy corner — these distinctions are obvious to a buyer standing in the home and invisible to an automated model.
Automated tools also lag on the things that change fastest: shifts in interest rates, sudden swings in inventory, and the differences in carrying costs — property taxes among them — that vary meaningfully from one area to the next and weigh on what buyers can afford. Because of all this, online estimates frequently trail reality, and the gap is widest exactly when the market is moving quickly. Understanding how homes actually get priced on Long Island shows what a formula leaves out.
How Buyers Actually Determine Value
Here's the part that matters most for a seller weighing whether to trust the number: buyers don't price homes with algorithms. They compare options. When a buyer decides what a home is worth, they're looking at what else they could buy right now, how the home stacks up against recent similar sales, whether the price feels justified given the condition and usability, what the monthly carrying costs including taxes will run, and how long comparable homes are taking to sell.
In other words, value is shaped by context, not by formula — and context is the one thing an automated estimate can't supply. This is why a home can sell well above or well below its Zestimate depending on the moment, the competition, and the condition. A seller who understands how buyers reason their way to an offer is far better equipped to see why the online number and the market number so often diverge.
When a Zestimate Can Be Especially Misleading
Automated estimates are least reliable in exactly the situations where a seller most needs accuracy. A home that's been renovated or partially updated tends to be undervalued, because the algorithm can't see the work. A market that's shifted quickly leaves the estimate chasing old data. Tight or suddenly expanding inventory throws off the comparison set. A property that's unique or hard to compare gives the formula too little to work with. And when buyer affordability thresholds are moving, the number can be stale before it even loads.
In any of these moments, pricing off an automated figure invites one of two costly errors: overpricing that stalls the listing, or underpricing that leaves money on the table. The estimate's confidence is the same either way — it doesn't know when it's wrong, which is why a seller can't rely on it to signal its own blind spots.
Why "Starting High" Backfires
A particular temptation deserves its own mention, because it catches so many sellers: using a high Zestimate as justification to list high "just to see." The logic feels harmless — leave room to come down. In practice, on Long Island, it tends to work against the seller in ways that are hard to undo.
An overpriced launch reduces early showings, invites buyers to sit back and wait for the inevitable price drop, and drains the urgency out of the crucial first two or three weeks when the freshest and most motivated buyers are paying attention. By the time the price corrects, the listing has often lost the very momentum that produces strong offers, and the seller negotiates from a weaker position than if the home had been priced right from the start. The cost of that early stumble is explored further in the discussion of what days on market really signals to buyers.
A Smarter Way to Understand True Value
The alternative to trusting the algorithm isn't guesswork — it's a pricing approach grounded in what's actually happening in the market. That means starting from recent, relevant comparable sales, weighing the active competition buyers are choosing among right now, adjusting honestly for the home's condition and presentation, and factoring in demand, seasonality, and the interest-rate backdrop. Together, those inputs reflect how buyers are behaving today rather than what a formula predicts from yesterday's data.
This is the difference between a number and a strategy. A Zestimate can open the conversation, but a considered, local read on value is what actually protects a seller's outcome. When it helps to see how a specific home lines up against the market as it stands, a quiet, data-grounded look at current value is a good place to start.
FAQs
Is a Zestimate a good way to price a Long Island home?
It can serve as a rough reference, but it shouldn't be used on its own. An automated estimate can't see condition, layout, or current buyer demand — the very things that determine a real sale price. A local, data-driven market analysis gives a far more reliable picture of what buyers would actually pay.
Why does a Zestimate change so often?
Automated estimates update as new data is added or broad market inputs shift, even when nothing about the home itself has changed. Those movements reflect the algorithm's data feed, not genuine changes in what a specific home is worth. It's one more reason to treat the number as a loose indicator rather than a valuation.
Can a home sell for more or less than its Zestimate?
Yes, and it happens frequently in both directions. Buyer demand, competition, condition, and carrying costs can push a sale price well above or below the automated figure. The estimate is a starting reference, not a ceiling or a floor — the market decides the actual number.
Do buyers take Zestimates seriously?
Most buyers glance at them casually but base real decisions on comparisons to similar homes and current market conditions. A buyer weighing an offer is thinking about what else they could buy and what recent sales suggest, not what an algorithm displayed. That's why the online number rarely dictates what a home actually sells for.
What's the best way to know a home's real market value before listing?
A data-driven local market analysis that accounts for condition, competition, and demand is the most reliable approach. It reflects how buyers are behaving right now rather than what a formula projects from older data, and it helps a seller avoid the pricing mistakes that come from over-trusting an automated estimate.
Let's Talk When You're Ready
An online estimate is a fine place to start a seller's curiosity, but it's a poor place to end a pricing decision. What a home is really worth depends on condition, competition, and how buyers are behaving in the market right now — none of which an algorithm can fully see. For a seller who wants a clear, grounded read on where their home actually stands, with no pressure either way, the door is open whenever the timing feels right.
By Eric Berman, REALTOR® | The Eric Berman Team at Compass
Eric Berman | Long Island & Queens REALTOR® | Compass
1468 Northern Blvd, Manhasset, NY 11030
(917) 225-8596 | eric@ericbermanteam.com | theericbermanteam.com
