Fairfax County Active House Inventory Reaches a 2026 High as September Buyer Activity Lags 2025 | Fairfax County Inventory Tracker | September 15, 2026
Fairfax County Active House inventory reached a new 2026 high during the week ending September 13 as the expected September increase in New Listings coincided with a decline in New Contract activity.
There were 2,102 Active Houses at the end of the week—28% more than the same week in 2025. During the week, 365 New Listings entered the market compared with 200 New Contracts.
New Listings have now exceeded New Contracts for 29 consecutive weeks.
But this week's data introduce another important factor into the inventory story.
Throughout June through August, Fairfax County New Contract activity remained reasonably close to 2025 even as Buyers took longer to decide among more available Houses. That allowed inventory to accumulate without requiring a substantial decline in overall Buyer activity.
Early September is beginning to look different.
New Contract activity has now declined during the period when New Listings are increasing, and New Contracts for the week ending September 13 were 26% below the comparable week in 2025.
That means lower Buyer activity may now be joining longer Buyer decision times as an additional contributor to upward inventory pressure.
Fairfax County Active House Inventory Reaches A New High for 2025
Active Inventory increased from 1,874 Houses the prior week to 2,102 Houses for the week ending September 13.
That moves inventory well above the relatively stable range around 1900 Active Houses since mid-July and represents the highest weekly level since this tracking began in March.
The year-over-year comparison is also significant. Fairfax County now has 455 more Active Houses than during the comparable week in 2025, an increase of 28%.
And 2025 was not a low-inventory comparison year. September 2025 inventory was already approximately 33% above 2024, which followed the prior months' large year-over-year % increases compared to 2024.
The current inventory level therefore reflects more than a return to a historically constrained market. Buyers are operating with substantially more available choices than they had one year ago—and one year ago they already had considerably more choices than in 2024.
New Listings Have Exceeded New Contracts for 29 Consecutive Weeks
The persistent relationship between New Listings and New Contracts remains a central part of the 2026 inventory story.
For the week ending September 13:
365 New Listings entered the Fairfax County market.
200 Houses went Under Contract.
That represents a weekly difference of 165 Houses.
The preceding week also produced a substantial imbalance, with 342 New Listings compared with 228 New Contracts.
The expected increase in September New Listings is therefore occurring without a corresponding increase in Contract activity, as the weekly New Contracts numbers for the first two weeks in September are in line with the low level seen during August.
New Listings have now exceeded New Contracts for 29 consecutive weeks.
That does not mean the difference between New Listings and New Contracts is itself an inventory accounting equation. Houses can also leave Active status through withdrawal, cancellation, expiration, temporary off-market status, or other changes.
But when New Listings persistently exceed New Contracts, the market must absorb that difference through other listing-status changes or an increase in Active Inventory.
This week, Active Inventory increased substantially.
September Buyer Activity Is Now Materially Below 2025
This may be the most important development in the current data.
Last week's early-September Contract comparison to last year required caution because Labor Day occurred on September 1 in 2025 but September 7 in 2026. Comparing the same calendar dates meant the holiday could have affected the two periods differently.
A second week of September data makes the calendar explanation less persuasive as the primary explanation for the Buyer activity gap.
For the week ending September 13, the Inventory Tracker recorded 200 New Contracts—26% fewer than during the comparable week in 2025.
A separate review of New Contracts activity in Fairfax County reinforces the point. For September 1-14:
• All property types/all price points: 384 New Contracts (vs. 450 for same period in 2025)
• Houses ≤$2M, excluding condos/new construction: 273 New Contracts (312 New Contracts in 2025)
Most of the New Contracts shortfall during the first two weeks of September vs. 2025 came during the second week. The most recent weekly New Contracts totals in these tracking segments are the lowest since the start of March.
Last year, weekly New Contracts activity showed a notable increase during the second week of September, then maintained similar level through the latter two weeks of September. In 2026, the weekly New Contracts number declined the second week, with a significant drop compared to 2025.
One or two weeks do not establish a sustained Fall trend. But the second week of September provides stronger evidence that early-September Buyer activity is materially lagging 2025 rather than simply reflecting the different timing of Labor Day.
Why Lower Buyer Activity Changes the Inventory Analysis
This distinction matters because the mechanism behind rising inventory helps explain the condition Sellers are facing.
During much of the Summer, the market could be described approximately this way:
Weekly New Listings consistently exceeded New Contracts, but often by a relatively small number, while Buyers continued purchasing Houses at a pace relatively close to 2025, but took longer to decide among more choices.
As Houses remained Active longer, inventory accumulated.
The early-September data introduce another potential component:
Weekly New Listings continue to exceed New Contracts + Buyers take longer to decide + overall New Contract activity falls below 2025.
If that combination persists, lower Contract volume would become an additional source of upward inventory pressure rather than inventory growth solely being driven primarily by longer Buyer decision times, with New Contracts and New Listings running relatively in line with 2025 numbers.
That possibility is particularly important in September because New Listings typically increase as the Fall market begins. We saw this increase during the first two weeks of September.
More Houses entering the market at the same time fewer Houses are going Under Contract creates a different supply-demand environment than we observed through much of the Summer.
Higher Active Inventory Is a Northern Virginia Market Condition
The increase in available inventory is not isolated to Fairfax County.
For the week ending September 13, every Northern Virginia locality tracked had significantly more Active House inventory than during the comparable week in 2025:
Alexandria: 435 Active Houses, +41%, or 126 additional Houses
Loudoun County: 925, +32%, or 223 additional Houses
Fairfax County: 2,102, +28%, or 455 additional Houses
Prince William County: 923, +23%, or 170 additional Houses
Arlington County: 517, +17%, or 75 additional Houses
Stafford County: 500, +17%, or 73 additional Houses
The magnitude differs by locality, but the direction is consistent: Buyers have more Active House inventory to consider throughout the Northern Virginia market.
That regional consistency is important because it indicates that Fairfax County's elevated inventory is part of a broader market environment rather than an isolated county-level condition.
More Inventory Is Increasing Competition for Buyer Attention
The practical consequence of higher inventory is not simply that Buyers have more Houses from which to choose.
Each additional choice also creates another competitor for Buyer attention.
That becomes particularly important when combined with the Days on Market data. As of September 9, 58% of Fairfax County Active Houses already had 30+ Days on Market and 34% had 60+ Days.* The link goes the the September 11, 2026 post on Fairfax County New Contracts ration and Fairfax County/Northern Viriginia market segment Days on Market tracking.
At the same time, recent Buyer activity had shifted back toward newly listed Houses: 54% of New Contracts from August 26 through September 8 involved Houses with 14 Days or less on market, compared with 29% involving Houses with 30+ Days on Market.*
*Houses ≤$2 million and exclude condos and new construction. The Northern Virginia market segment is the Counties of Fairfax & Arlington; Cities of Alexandria, Fairfax, & Falls Church.
The result is a market with both more available inventory and a large population of Houses already competing from extended Days on Market positions.
If overall New Contract activity also remains below 2025, competition for a smaller pool of Contract activity would become increasingly consequential.
What Does This Mean for Northern Virginia Sellers?
Countywide and regional statistics establish the market environment, but they do not determine the outcome for an individual House.
The relevant competitive environment for a Seller remains the micro-market in which Buyers compare that House with its actual alternatives.
But the broader data make the strategic challenge increasingly clear.
Buyers have substantially more Houses to consider. New Listings are continuing to enter the market. A large share of existing inventory already carries extended Days on Market. And early-September New Contract activity is materially below last year.
For Sellers, that increases the importance of establishing the House as a Preferred Choice at launch.
Pricing, preparation, presentation, and positioning should work together before the House enters the market—not after significant Days on Market have accumulated.
The first 2–3 weeks remain the Market Tipping Point, when a House has its strongest opportunity to capture concentrated Buyer attention before joining the much larger pool of extended-Days-on-Market inventory.
What Should We Watch Next?
The principal question is now whether the early-September New Contract gap persists.
If Contract activity rebounds toward 2025 levels, the first two weeks of September may prove to represent a temporary period of weaker Buyer activity around the transition from summer into the Fall market.
If New Contracts continue to remain materially below 2025 while New Listings stay elevated, however, the evidence would become stronger that the Fall market is experiencing a more meaningful change in the supply-demand balance.
That would represent an important evolution from the Summer market.
The issue would no longer be primarily that Buyers have more choices and are taking longer to decide. There would also be fewer Houses going Under Contract relative to last year while additional inventory continues entering the market.
The next 7-10 days should tell us which market is developing.
Bottom Line
Fairfax County entered mid-September with 2,102 Active Houses—the highest weekly inventory level recorded since this tracking began in March and 28% above the same week in 2025.
New Listings have exceeded New Contracts for 29 consecutive weeks, and the expected September increase in New Listings is now occurring alongside materially lower early-September New Contract activity.
That is the important new development.
From May through August, longer Buyer decision times helped inventory accumulate even while Contract volume remained reasonably close to 2025. If September New Contracts activity continues to lag last year, lower overall Buyer activity could become an additional contributor to upward inventory pressure.
For Sellers, the consequence is increased competition for Buyer attention in a market where Buyers already have substantial choice. Positioning a House to stand out as a Preferred Choice during its initial market exposure is therefore becoming increasingly important.
Related Reading
Buyer activity has recently shifted back toward newly listed Houses, while a substantial share of Fairfax County and Northern Virginia Active Inventory continues to carry extended Days on Market. This analysis examines the Fairfax County Under Contract ratio and Days on Market data to show where Buyers are concentrating their activity within today's elevated inventory.
Buyer behavior is only one part of the current market. The latest Fairfax County Inventory Tracker examines the supply side of the market, including elevated Active House inventory and the continuing relationship between weekly New Listings and New Contracts.
Frequently Asked Questions
How high is Fairfax County Active House inventory in September 2026?
For the week ending September 13, Fairfax County had 2,102 Active Houses, the highest weekly level since this tracking began in March and 28% more than the same week in 2025. Active Inventory also moved above the relatively stable range observed from mid-July through early September.
Why is Fairfax County Active House inventory continuing to increase?
Several factors are contributing. New Listings have exceeded New Contracts for 29 consecutive weeks, Buyers have been taking longer to make decisions, and early-September New Contracts activity is now materially below 2025. If lower Contract activity persists while Fall New Listings remain elevated, it could add further upward pressure on inventory.
Is Fairfax County Buyer activity lower than it was in September 2025?
Early-September New Contract activity is materially below 2025. For the week ending September 13, Fairfax County recorded 200 New Contracts, 26% fewer than during the comparable week in 2025. Additional September data will show whether this represents a temporary period of weaker activity or a more sustained Fall market change.
Could the different Labor Day dates explain the lower September New Contract activity?
The different Labor Day dates complicated the initial comparison because Labor Day occurred on September 1 in 2025 and September 7 in 2026. However, New Contracts activity was substantially below 2025 with the second week of September data. That makes the calendar difference less persuasive as the primary explanation for the current gap.
Is higher Active House inventory limited to Fairfax County?
No. For the week ending September 13, each Northern Virginia locality tracked had significantly more Active House inventory than the same week in 2025. Increases ranged from 17% in Arlington and Stafford Counties to 41% in Alexandria, indicating that elevated inventory is a broader Northern Virginia market condition.
What does higher inventory and lower New Contract activity mean for Northern Virginia Sellers?
Buyers have more Houses to consider while competition for Buyer attention is increasing. If New Contract activity continues to lag 2025 as additional Fall inventory enters the market, the supply-demand balance could become more challenging for Sellers. Pricing, preparation, presentation, and positioning at launch become increasingly important when Buyers have substantial alternatives.
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