Why Did a Free Home Valuation in Albany, NY Come Back $40K Apart on Two Different Sites?

The first call came in on a Sunday afternoon in late March. A homeowner over in Niskayuna had spent the morning at her kitchen table pulling up every site that promised a free home valuation in Albany, NY. Zillow gave her one number. Redfin gave her a number $28,000 higher. A third site she clicked through from a Facebook ad came back $14,000 below Zillow. By lunch she had a $42,000 spread on the same house.

Her house was a 1970s split-level on a corner lot just off Balltown Road. Four bedrooms on paper, three usable. A finished basement her father-in-law had put in twenty years ago that no public record knew existed. A kitchen last touched in 2004. None of that nuance was in any of the three estimates.

What the algorithms are actually doing

An online estimate is a regression model. It takes the tax records — square footage, bedroom count, bathroom count, lot size, year built — and compares them against recent sales of houses with similar tax records in the same general area. The math is competent. The data feeding it is the problem.

In the Capital Region, the tax assessor’s record is often years behind reality. Finished basements that were never permitted do not exist. A kitchen that was gutted and rebuilt in 2019 looks identical to one with original 1978 cabinets if no permit was pulled. The model is comparing the version of the house that lives in the county database against other versions of houses that also live in the county database, and the two databases are often equally wrong in opposite directions.

That is before you get to the geography problem. The Capital Region is not one market. A house on the south side of a street might feed into the Niskayuna school district. A house on the north side might feed into Schenectady. The algorithm sees one zip code. The buyer sees two different futures.

The Sunday afternoon spread, explained

Zillow had her at the middle number because Zillow leans heavily on recent sales velocity. Redfin had her higher because it pulled in a comp from two blocks over that had sold furnished and turnkey six weeks earlier. The third site was a lead-generation funnel — its low number gets a homeowner to click “connect me with a local agent.”

None of those three numbers were lying. They were answering different questions. Her actual question — what is the most a real buyer will write a real check for on this specific house in the next forty-five days — was not what any of them were built to answer.

What the walkthrough caught

We walked the house on a Tuesday evening. The finished basement was the first surprise. Roughly 700 square feet of livable space that did not exist on any tax record. Adding that to the comp set moved the floor of her range up by roughly $18,000.

The kitchen was the second surprise, in the other direction. What had been updated was the appliances and the countertop. The cabinets were the original 1970s boxes with new doors. In a buyer’s head walking through in 2026, the kitchen was going to read as a project. That observation pulled the ceiling of her range down by close to what the basement had added.

The lot orientation came up next. Her house faced north. In photos that would read as a tired yard. The neighbor’s south-facing house had sold the previous summer for $11,000 over asking. The algorithms had treated those houses as comparable. They were not.

What a real valuation actually does

The point of an in-person valuation is to do the thing the algorithm cannot — look at the specific house, on the specific lot, in the specific block, in the specific month, with the specific buyer pool currently active. The exercise is closer to how a comparative market analysis is built than anything a website spits out in three seconds.

At the end of that exercise her range came in tighter than any of the three websites had it. The midpoint landed about $9,000 below the Redfin estimate and about $19,000 above the Zillow one.

What homeowners ask

The first question is whether the online estimates are worthless. They are not. They are useful for tracking equity or running a quick gut check. They are a thermometer, not a diagnosis.

The second is why Zillow shows a house for less than the owner paid. The answer is the model has not caught up to something. It is not personal.

The third is whether to bother with online estimates before talking to a local agent. Use them, but the way you would use a weather app before stepping outside.

The walk-back from the kitchen table

The seller in Niskayuna listed two weeks after our walkthrough. The price we set was inside the range the in-person analysis produced. The first weekend produced nine showings, two offers, and a small bidding gap. The house went under contract at $4,000 above asking.

If you are weighing whether to trust the number on the screen, the more useful question is what a buyer walking up your front walk in the current market would feel. That is what a serious pre-listing seller consultation is built to answer. For more on what happens after the valuation is settled, the walkthrough of pulling full value out of a Capital Region listing covers it.

The most important thing about any free home valuation in Albany, NY from a website is that it is the beginning of the conversation. You can request a seller walkthrough here.