Ranked by Price Movement, Four Local Markets Tell Four Different Stories

Rank the territory's four ZIPs by one number, how much their median sale price moved compared with a year earlier, and the list does not sort the way most people would guess.

Across the full territory, 651 homes sold in this twelve-week window, at a median price of $747,000. Homes typically took 53 days to sell, and sellers landed a median 100% of their list price. That last figure matters: it means the typical seller here got almost exactly what they asked for. But the four markets did not get there the same way.

Start at the top. One of the two Reston ZIPs posted the sharpest gain in the territory by a wide margin. A year ago, the median sale price there was $510,000. This period, it is $622,500, a jump of about 22%. Nothing else in the territory moved anywhere close to that.

Next comes an Ashburn market with a modest, steady gain. A year ago its median sale price was about $852,503. This period it is $865,000, up roughly 1%. That is the kind of move that barely registers on a chart but represents real continued demand.

Third is the other Reston ZIP, and it barely moved at all. A year ago the median there was $649,500. This period it is $650,000, up less than a tenth of a percent. Call it flat. Prices held, they simply did not build on last year.

Then there is the market at the bottom of the list, and it is the one that breaks the pattern. The other Ashburn ZIP is the only one of the four where the median sale price fell year over year, down about 7%, from $750,094 a year ago to $700,000 this period. Every other market in the territory gained ground. This one gave a little back.

That split is worth sitting with, because it undercuts a common assumption: that a metro-area market moves as one thing. It does not. Two ZIPs that share the name Ashburn just posted opposite results, one up about 1%, the other down about 7%. Two ZIPs that share the name Reston did the same in reverse, one up about 22%, the other essentially flat.

There is a second split worth noting, this one about speed rather than price. In one of the Reston markets, homes took a median 49 days to go under contract. In one of the Ashburn markets, the same measure ran 39 days, ten days faster. A ZIP posting the territory's biggest price gain is not automatically the ZIP where homes move fastest. Price and pace are answering two different questions.

What does this mean if you own in the Ashburn ZIP where prices slipped about 7%? It does not mean the market turned against you. It means pricing has to be built off this period's numbers, not last year's, and a listing priced to last year's level is starting the negotiation from a number the market has already moved past.

If you own in the Reston ZIP that gained about 22%, the opposite risk applies. Comparable sales pulled from even a few months ago may already read low against where this market sits now.

The wider point holds for buyers in either town. A single number for the whole territory hides which specific market you are actually shopping in, and this period the gap between the strongest and weakest of the four ZIPs ran into the double digits.

What we will be watching next period is whether the Ashburn ZIP that fell keeps drifting, or whether this twelve-week window was a one-time dip inside a longer flat stretch. One period of decline is a data point. A second one in the same direction would be the start of an answer.

This update draws on MLS sold data for Ashburn and Reston, Virginia. Trista Haugen tracks these four markets closely and is glad to talk through what any of these numbers mean for a specific address.