You looked up your house on Zillow and the number went up. Then you read that Brighton sold prices dropped. You are not losing your mind, and neither number is necessarily wrong. They measure two different things, over two different areas, across two different time windows.

Here is what this post covers: what the Zillow Home Value Index actually is, what a median sale price actually is, why a rising index and a falling median can coexist, which numbers I could verify and which I could not, and what any of it means if you are deciding whether to list this fall.

I am going to show you the sourcing as I go. Where I do not have a number, I will say so rather than fill the gap.

The two numbers, side by side

Notice that the Monroe County listing price and the Monroe County home value figure are about $34,000 apart, and they are both about Monroe County. That alone should tell you these are not interchangeable measurements.

Zillow home value index explained

The Zillow Home Value Index, or ZHVI, is a modeled estimate. Zillow runs a valuation model across essentially every home in a geography, whether or not that home was listed or sold. Then it reports a smoothed average of those modeled values.

Three things follow from that:

• It includes homes nobody bought. The 1968 ranch on a side street in Henrietta that has not changed hands since 1991 is in the index. It is not in any sold statistic.
• It is smoothed and lagged. The Monroe County figure above carries an update date of April 30, 2026. When you read it in late summer, you are reading spring.
• It is a model, not a measurement. Models are decent at direction across large areas and weaker on any single street.

ZHVI is genuinely useful for one job: telling you roughly which way a whole county drifted over a year. It is a poor tool for pricing your specific house next month.

What a median sale price actually measures

A median sale price is the middle number in a list of actual closings. Line up every Brighton sale in April, May and June of 2026 from cheapest to most expensive, and the one in the middle is the median. It is a real transaction, not a model output.

That sounds more trustworthy, and in one sense it is. But it has its own quirk, and it is the quirk that explains the whole headline.

A median describes the mix of what sold, not the value of what did not sell.

Brighton's Q2 2026 median came in at $424,150 against $462,170 a year earlier. That is an 8.2 percent drop. It does not automatically mean every Brighton house lost 8.2 percent of its value. It means the middle house that closed this spring cost 8.2 percent less than the middle house that closed last spring.

Those are different claims. If Brighton had a heavier run of two-bedroom capes and mid-century splits this spring, and fewer of the larger houses off Clover or near the Twelve Corners area, the median falls even in a market where every individual house held its price. Mix shifts move medians. That is not a flaw in the statistic, it is what the statistic is.

Also note the average moved less than the median: down 4.3 percent versus down 8.2 percent. When the average and the median disagree about the size of a move, mix is usually part of the story.

The four honest reasons ZHVI and Brighton's median can both be right

• Different geography. One is all of Monroe County. The other is one town. Brighton's median sale price sits well above the county average home value. A town at that price point can move in its own direction while the county drifts up.
• Different time window. The Zillow county figure is dated April 30, 2026. The Brighton figure covers April through June 2026 compared against April through June 2025. They barely overlap.
• Different population of homes. ZHVI values every house. The median only counts closings.
• Different method. One is a model. One is a count of receipts.

Why your search results are worse than you think

Two concrete problems I ran into while checking these numbers, both of which you will hit too.

First, the aggregators disagree wildly with each other. For the City of Rochester in July 2026, three sources published three different median sale prices: $199,000 from Movoto, $230,000 from Houzeo, and $255,000 from a third blog. That is a $56,000 spread on the same city in the same month. Sold counts conflict too, 509 from one source and 643 from another. Movoto's own page states 643 homes sold, "up from 707 last year," which is a 9.1 percent decline described as an increase. The same page identifies the local school district as "Monroe County R-1," which is in Missouri.

Houzeo, meanwhile, published 51 median days on market and 120.57 percent of asking price on the same page for the same month. Homes bid twenty grand over list do not sit for 51 days. At least one of those figures is wrong and a reader has no way to tell which. I am not repeating either as fact, and neither should anyone else.

Second, Brighton is a name collision. Search Brighton NY home prices and you will get New Brighton on Staten Island at a $545,000 Q2 2026 median, West Brighton at $772,000, Brighton Beach in Brooklyn at $722,000, and Brighton near Syracuse. None of those are Monroe County. If you see a Brighton number in the $545,000 to $772,000 range, it is almost certainly downstate. The Movoto Brighton page lists Corn Hill, South Wedge and Maplewood among its Brighton neighborhoods. Those are City of Rochester. It also lists Bensonhurst, which is Brooklyn. Whatever boundary that page is drawing, it is not the Town of Brighton.

What I do not have

Being straight about the gaps is part of the job.

• No complete sold data for August 2026 exists yet for Rochester, Monroe County or Brighton. Monthly closings publish the following month.
• No July or August 2026 median sale price for Brighton. Q2 2026 is the most recent verified town figure.
• No sold price per square foot for Brighton from a source I trust. The $195 figure floating around is a list price and comes from the page with the boundary problem.
• No active listing count or months of supply for Monroe County that I could verify.
• No town-level figures at all for Henrietta, West Henrietta, Pittsford, Mendon, Rush or Honeoye Falls. These towns do not get their own published monthly release the way the county does. If you own in one of them, a county index tells you very little about your street.

The rate backdrop, since it is the one clean number here

Freddie Mac's Primary Mortgage Market Survey put the 30-year fixed at 6.65 percent for the week ending August 20, 2026, down from 6.67 percent the prior week and 6.69 percent the week before that. A year earlier it was 6.58 percent. The 15-year fixed averaged 5.96 percent for the week ending August 13, 2026, against 5.71 percent a year prior.

A seven basis point year over year change on the 30-year is noise. Rates are not what moved Brighton's median.

What to do with all of this if you own here

If you are thinking about selling: ignore both the index and the town median as pricing tools. Neither one knows about your kitchen, your roof age, your lot, or whether your basement stays dry. Pricing comes from closed comparable sales on similar houses, adjusted for condition, then checked against what is currently active and competing with you.

If you are buying: the disagreement between sources is not a reason to wait, it is a reason to work from actual comps. Brighton's median moving down 8.2 percent in one quarter does not mean the house you want is negotiable. It means the mix of what sold shifted.

If you are just watching: track direction over several quarters, not a single print. One quarter of median data in one town is a small sample.

I spent years buying and rehabbing houses before I got licensed, which is a long way of saying I learned early that a model number and a closing number are not the same animal. The model tells you the weather. The comps tell you what to wear.

If you want to know what your specific house in Brighton, Pittsford, Henrietta or anywhere in south and southeast Monroe County would actually sell for, that is a conversation with real comps in front of us, not an index reading. Book a time with me and I will walk you through the sales I would use and why.

Khem Kadariya

About this data

The figures in this post were compiled from publicly available sources including Houzeo, Movoto, Zillow, FRED (Federal Reserve Bank of St. Louis) and Redfin, along with other public market data. Real estate numbers change quickly, and these were accurate as of August 2026. For current figures on a specific home, street, or town, ask me directly rather than relying on a published average.