Ask three data providers what a home in Ashburn costs this spring and you get three different answers. Redfin put the March 2026 median at $660,000, down 7.7% year over year. Zillow's ZHVI, updated May 31, 2026, sat at $808,889. BrightMLS-derived figures cited by local practitioners hovered between $710,000 and $725,000. None of them are wrong. They are measuring different Ashburns.
For a buyer comparing Ashburn to Reston, Vienna, or western Loudoun, that spread is the entire story. The town has quietly split into two products with different pricing logic, and a land offer made in March put a number on the split that no MLS report can.
Three medians, one town
Here is what the public data looks like right now, side by side.
| Source | Reading | As of |
|---|---|---|
| Redfin, median sale price | ~$660,000 | March 2026 |
| Zillow ZHVI, average value | ~$808,889 | May 31, 2026 |
| BrightMLS-derived, local practitioners | ~$710,000–$725,000 | Q1–Q2 2026 |
| Redfin, average sale price | ~$718,000 | ~April 2026 |
| Ashburn active listings entering spring | ~119 homes | February 2026 |
| Median days on market | ~22 days | Early 2026 |
The number a buyer sees on a portal is almost always Zillow's ZHVI, which is a modeled value across the entire housing stock. The number a listing agent quotes is usually the closed-sale median, which reflects what actually sold last month. Right now those two figures disagree by nearly $150,000, and the gap is the buyer's problem, not the seller's.
The reason for the gap is not statistical noise. It is that the buyer pool has bifurcated. One pool is chasing residential premium west of Loudoun County Parkway. The other is watching land trade at industrial multiples east of it.
What the Regency offer put on the record
On March 20, 2026, Data Center Dynamics reported that the Regency neighborhood, a community of roughly 150 homes off Waxpool Road and Ashburn Village Boulevard, was in active discussions to sell its entire 130-acre footprint to a data center developer. Northern Virginia Magazine confirmed the reporting four days later. The price on the table was approximately $4.4 million per acre, pointing to a total transaction near $576 million. Regency's HOA has set up an LLC affiliate, Community Works, to negotiate. Site plans reviewed by DCD suggest up to six data center buildings at 72 megawatts each. Power is not expected until the mid-2030s.
Two things about that transaction matter for anyone writing an offer in eastern Ashburn right now.
First, the parcel is surrounded. DataBank and Sabey sit to the north, Aligned to the east, Digital Realty to the south, and a CloudHQ development is planned on the southeast. Regency did not become a candidate for conversion because it was mispriced. It became a candidate because it was the last residential parcel inside a ring that had already closed.
Second, $4.4 million per acre is not a residential comp. It is an infrastructure comp. Homeowners inside that ring are no longer selling a house on a lot. They are selling optionality on an eventual land assemblage, and hyperscalers set the reserve.
That is the mechanism behind the ZIP-code split.
The 20147 versus 20148 story
Ashburn's two main ZIP codes trade differently because they sit on different sides of the data center footprint.
ZIP 20148 covers Brambleton, Moorefield Station, and parts of One Loudoun. It sits west and south of the densest data center corridor and trades closer to $796,000 on average, with well-priced homes often going pending in about 11 days. Buyers there are paying a residential premium: master-planned streetscape, walkable town center, the Silver Line's Ashburn Station within reasonable reach.
ZIP 20147 covers Ashburn Village, Broadlands, and the neighborhoods closest to the Waxpool and Shellhorn corridors. It trades closer to $719,000 on average. Some of that discount is age of housing stock. A meaningful portion is adjacency: noise from cooling systems and backup generators, industrial visual character, and construction traffic on the arterials.
A buyer comparing a $720,000 house in 20147 to a $796,000 house in 20148 is not comparing 10% of home. They are comparing two different theories of what Ashburn is going to be in 2035.
The distance framework a serious buyer should apply is not complicated. Third-party market intelligence and EPA industrial-noise guidance converge on a simple pattern: within a few hundred feet of a hyperscale facility, cooling noise is audible from the yard, and the adjacency discount is real. Beyond roughly a mile, the same facility contributes a modest employment premium and no measurable acoustic penalty. The gap between those two zones can be 900 feet of driving distance and six figures of value.
The friction that only shows up in due diligence
The transaction-specific work in Ashburn right now is not about school boundaries or HOA fees. Those are knowable from a listing sheet. The work is about entitlement risk on the parcels adjacent to the one you are buying.
Before submitting an offer east of Loudoun County Parkway, a buyer's checklist should include:
- Loudoun County planning applications for every adjacent parcel. Special-exception filings and rezoning applications are the earliest public signal that a neighbor is contemplating a data center use. Applications are searchable through the Loudoun County Land Development Applications system.
- Dominion interconnection queue and substation plans. A new 230kV or 500kV transmission line routed into Data Center Alley changes what the horizon looks like from a second-story window. Dominion has publicly discussed roughly $50.1 billion in capital projects between 2025 and 2029 tied to this demand.
- Board of Supervisors meeting minutes for the relevant election district. Michael Turner's committee has been the venue for the visible fights. Loudoun County had 199 operating data centers with another 117 in development at last public count.
- The 2026 impact-study law. Legislation sponsored by Delegate Josh Thomas and signed by Governor Spanberger now requires data center applicants to submit studies on impacts to schools, neighborhoods, and utility energy demand. That paperwork is your best early read on which parcels are moving next.
- HOA governance documents. The Regency situation is now a case study in how a homeowner association can quietly become a land-sale vehicle. If the HOA has recently amended its bylaws around dissolution, land sale, or affiliate LLCs, that is a material fact.
None of this is legal advice. It is the sequence a local buyer's agent should be walking a client through before earnest money goes hard.
Carrying costs the median doesn't touch
The other number the portal doesn't show is what it costs to keep the house running.
Loudoun County's 2026 real property tax rate is $0.805 per $100 of assessed value, and the average Ashburn homeowner's annual bill lands near $6,280. That rate is genuinely low relative to Fairfax neighbors, and it exists because data center commercial assessments carry a disproportionate share of the county's tax base.
The trade-off shows up on the electric bill. Dominion has proposed a 14% residential rate increase for 2026, citing data center growth and AI demand. Data center electricity use in Virginia surged roughly 231% over eight years by the company's own July 2024 disclosures. The 2026 General Assembly session debated phasing out Virginia's data center sales tax exemption but did not resolve it; the question returns in 2027.
A buyer running a full carrying-cost model on an Ashburn purchase should stress-test the utility line, not just the mortgage line.
Where the residential offset actually lives
None of the above argues against Ashburn. It argues for buying it deliberately.
The residential offset is real and specific. The Silver Line terminates at Ashburn Station with a parking garage and roughly 55 to 65 minutes of train time into downtown DC. The Washington & Old Dominion Trail runs 45 paved miles through the community. One Loudoun functions as the town center for weekend calendar. Brambleton, Broadlands, Belmont Country Club, and Willowsford each price their amenity package into resale in a way that has held up through the current cycle. Loudoun County's role as the world's largest data center market, at more than 4,900 megawatts of operating capacity by Q1 2025, is also the reason the local buyer pool refills every quarter with relocating tech and government-contracting professionals.
The point is not that Ashburn is expensive or cheap. The point is that "the Ashburn median" is a coin flip between two different housing products, and which one you buy determines what your equity is exposed to for the next ten years.
Questions we hear from Ashburn buyers
If a data center is announced next door after I close, what actually happens to my value? Published proximity frameworks and observed comps suggest adjacency discounts of several percent within a few hundred feet, tapering to negligible impact past roughly a mile. The larger risk is expansion: a facility at half a mile today can be at a quarter mile after a second phase. Verify planned capacity growth before you close, not after.
Is the Regency situation a one-off? The reporting frames it as the first residential community of its size to reach active negotiation, but the underlying land pressure is structural. When hyperscalers exhaust greenfield options inside the existing power envelope, they look at what is already there. Expect more approaches; expect most of them to fail; expect a small number to close.
Does 20148 insulate a buyer completely? No. It reduces adjacency exposure and correlates with a residential premium today. It does not protect against county-wide utility rates, transmission-line routing, or a change in the tax exemption that currently subsidizes the commercial base.
If you are weighing a purchase in Ashburn this year and want a specific parcel run through the checklist above, Gwak Homes will walk the map with you before you write the offer.
