A buyer stands in the driveway of a four-bedroom colonial in eastern Loudoun County, half a mile from a data center campus she didn't notice on the drive in until the agent pointed out the low hum coming from somewhere behind the tree line. She pulls out her phone and searches "do data centers lower home values." The first few results all point to the same place: a George Mason University study that found no evidence they do. Reassured, she keeps touring. That study is real, and it says what everyone claims it says. It is also measuring the wrong thing for the decision she's about to make.
The Study Everyone Cites, and Stops Reading
The study in question is Data Centers and 2023 Home Sales in Northern Virginia, produced by the Center for Regional Analysis at George Mason University's Schar School of Policy and Government and released in late 2025. Researchers Terry Clower and Keith Waters mapped every data center built or permitted by August 2024 across Fairfax, Loudoun, and Prince William counties, then compared that map against thousands of 2023 home sales. The conclusion, in the study's own words, is that the analysis "fails to demonstrate statistical evidence that proximity to a data center negatively impacts housing values." Homes closer to facilities sold for more, not less, and the pattern held across single-family houses, townhomes, and condos alike. Waters himself has said the finding surprised him: "It's not necessarily what we expected."
That result gets repeated on nearly every real estate blog covering Northern Virginia this year, usually as the whole answer. It isn't. It's an average of a three-county region, and averages are built to smooth over exactly the kind of variation a buyer standing in one specific driveway needs to see.
What the County Average Doesn't See
Loudoun County has 176 data centers, more than double the count in any other county in the country. That density matters, because a separate 2026 analysis reported by Newsweek looked specifically at homes within half a mile of an announced data center in Loudoun and found something the countywide study couldn't: those homes sold for roughly 2.8 percent less than comparable homes slightly farther away.
Both findings can be true at once. The GMU study is averaging outcomes across a huge number of homes, most of which sit nowhere near an actual facility and simply benefit from the same infrastructure, job growth, and tax base that data centers helped build. Fold in a small number of homes sitting inside the half-mile ring around a specific site, and their discount gets diluted into statistical noise at the county level. The average tells you what happens to Loudoun homes in general. It does not tell you what happens to the house across the street from a cooling tower.
This is the piece missing from most of what gets written about this topic locally: proximity effects and county-wide effects are not contradictory, they are measuring different things at different scales, and a buyer needs to know which scale applies to the specific parcel in front of them.
Averages Hide More Than Distance
The same blind spot shows up in price data that has nothing to do with data centers at all. As of March 2026, Redfin reported the countywide median sale price in Loudoun at $751,000, down 7.4 percent from a year earlier, with homes taking an average of 29 days to sell compared to 24 the year before. Zillow's home value index, updated through June 2026, put the typical Loudoun home at $720,713, down 1.7 percent year over year.
Meanwhile, in the One Loudoun neighborhood of Ashburn, the median sale price over the three months ending in July 2026 was $1.17 million, up 33.7 percent from the same period a year prior. That is not a typo and it is not the same market softening the countywide figure suggests. One submarket inside Loudoun cooled while another, a few miles away, ran hot enough to post one of the larger year-over-year gains in the region.
The lesson generalizes past data centers. A county-level median is a useful starting point and a poor stopping point. Whether the variable in question is a data center's fence line or a specific neighborhood's demand curve, the number that matters is the one attached to the actual address, not the one attached to the county.
The Tax Bill Every Loudoun Homeowner Is Already Getting
Here's the part of the story that rarely makes it into the noise-complaint headlines. A 2026 report prepared by Mangum Economics for the Northern Virginia Technology Council calculated what would happen to residential tax rates in Loudoun if data centers disappeared tomorrow. The answer: the rate would need to rise from $0.805 to $1.537 per $100 of assessed value, a 91 percent increase, adding roughly $5,856 a year to the property tax bill on a median-valued home.
That number is the flip side of the noise complaints. Every homeowner in Loudoun County, whether they live next to a server farm or thirty miles away in horse country, is already collecting a tax subsidy that most have never been told exists. The county's own February 2026 assessment presentation backs this up at the balance-sheet level: total taxable real estate in Loudoun reached $185.6 billion, up 12 percent year over year, and taxable commercial property climbed to $68 billion, a 26.9 percent increase, driven almost entirely by data centers. Commissioner of the Revenue Bob Wertz noted that residential sale prices had moderated as the county settled into a more stable pattern, and the numbers reflect that restraint. The typical existing single-family home saw its assessed value rise just 1.4 percent for the year, and attached townhomes rose 0.5 percent.
Put those two facts side by side and you get a more complete picture than either headline offers alone. Data centers are not making the average Loudoun home appreciate wildly. They are keeping the tax bill on that home lower than it would otherwise be, while a small number of specific homes near specific facilities absorb a real, measurable discount that the county-wide numbers wash out. Both things are happening in the same county, to different houses, for different reasons.
What to Actually Ask Before You Write an Offer
If you're evaluating a specific listing in eastern or central Loudoun, the county average won't answer the questions that matter. These will:
- How far is the property from the nearest built or announced data center site, measured in a straight line and not just drive time
- What cooling technology does that facility use, since air-cooled systems tend to generate more of the sustained mechanical hum that neighbors report
- Has the county received noise complaints tied to that specific campus, and how recently
- What noise ordinance applies to the site, and whether it's the older 55-decibel property-line standard or a newer buffer requirement
- Whether the facility's site plan includes a buffer setback, since newer county ordinances commonly require 200 to 500 feet between a data center and the nearest residential lot line
That last question has teeth. Residents near a Vantage Data Centers campus in Sterling have reported a persistent hum along with diesel fumes after backup generators kicked in during a power outage, and the county fielded roughly a dozen formal noise complaints tied to that campus in a single year. Complaints like that are part of why Loudoun is actively revisiting its noise ordinance, because standard decibel readings don't fully capture the low-frequency tonal hum residents are describing. None of that shows up in a county-wide price average. All of it shows up if you stand in the yard at dusk.
A Few Questions Worth Asking
Does this issue apply everywhere in Loudoun County? No. Western Loudoun, including the horse country around Middleburg and Purcellville, has essentially none of this development. The fence-line effect is concentrated in eastern and central Loudoun, closer to Dulles and the existing data center corridor.
If data center growth slows down, will my taxes go up? That's the exact risk the county is managing. Loudoun's Revenue Stabilization Fund exists specifically to cushion the budget against a slowdown in data center revenue, and the county proposed a $47.7 million contribution to that fund for fiscal year 2026. The subsidy is real, and so is the county's own acknowledgment that it can't be counted on forever.
Should I avoid buying anywhere near a data center? Not automatically. The countywide research suggests most homes in Loudoun are unaffected or even benefit from the surrounding growth. The discount shows up in a specific radius around specific sites, which is exactly why the distance and siting questions above matter more than the county's overall reputation.
If you're weighing a specific address against these numbers, or trying to figure out what a data center's presence actually means for a property you're considering, that's a conversation worth having before you write an offer, not after. Brian MacMahon can walk through the specific parcel, the specific facility, and what the data actually supports for that address. Request a free home valuation or schedule a consultation to start with the numbers that apply to your situation, not the county's.
