Washington Dulles International Airport lists its own operations office at 45045 Aviation Drive, Sterling, Virginia. That is not a quirk of postal boundaries. It is a fact that shapes what a Sterling home costs, what a seller has to put in writing, and why the town has spent decades priced below its neighbor to the north, Ashburn, for reasons that go beyond the age of the houses.
Most comparisons of the two towns stop at construction dates. Sterling filled in during the 1960s and 70s as a commuter suburb, Ashburn arrived decades later as a master-planned tech corridor, and the price gap gets filed under "older stock, newer stock." That explanation is true as far as it goes. It also skips the part of the story that sits on Loudoun County's own zoning map, and the part that just became state law.
The Zoning Line That Explains More Than the Age of the Houses
Loudoun County maintains something called the Airport Impact Overlay District, a zoning designation built around the FAA's day-night average sound level measurements for Dulles. The county cannot regulate airport noise or dictate flight paths. What it can do, and has done since the early 1990s, is control what gets built on the ground underneath those flight paths.
The overlay has three tiers. Land inside the highest noise zone, Ldn 65 or above, cannot host new residential development at all. The Ldn 60-65 band, along with a one-mile buffer beyond it, carries its own set of land use restrictions and is where existing residential neighborhoods run into the boundary directly. The Board of Supervisors last redrew these lines on January 17, 2023, using updated noise contours the Metropolitan Washington Airports Authority produced in 2019, and the amendment touches an estimated 59,000 properties around the airport.
That is not a Sterling-only number. The district wraps around the airport itself, which means it reaches into parts of Ashburn as well. But Sterling's geography puts more of the town inside the tighter bands, simply because the airport's runways sit closer to it than to Ashburn's newer subdivisions further north. A zoning line most buyers never think to ask about is doing real work in the price data, and it has been doing that work for over thirty years without much attention from anyone outside county planning staff.
The Overlay Restricts Land Use. It Doesn't Silence the Sky.
None of this means Loudoun has solved the noise question. The county's own aviation page is direct about the limits of what an overlay district can do: it shapes what gets built, not what flies overhead. Residents of the Birchwood at Brambleton development in Loudoun County have gone on record with county supervisors about jet noise on departure from Runway 30, and the response from the Board has been to commission consultants and lobby the FAA rather than promise relief. The overlay protects future buyers from being surprised by land the county already knows is loud. It does not make the land quiet.
That distinction matters for how a buyer should read a Sterling listing. Being inside the AIOD is not a defect to be fixed. It is a documented, mapped condition of the property, the same way a lot's flood zone or septic type is a documented condition. The overlay exists precisely because Loudoun decided decades ago that buyers deserved to know this before they signed, not after they moved in.
The Paperwork Just Changed
Until last year, "before they signed" meant checking a county map on your own initiative. That changed with an amendment to the Virginia Residential Property Disclosure Act, enacted March 18, 2025 and effective July 1, 2025. For the first time, the standard disclosure statement every Virginia seller provides now includes language pointing buyers toward aircraft noise zone due diligence.
The statute is careful about what it does and does not require. It tells sellers to direct purchasers to exercise whatever due diligence a particular purchaser deems necessary, and points them toward the locality's maps or the Department of Aviation's website rather than asking the seller to characterize the noise personally. The Virginia Department of Professional and Occupational Regulation says Virginia remains a caveat emptor state for residential sales, meaning sellers can still check a box declaring they make no representations about the property's condition. This amendment does not override that. It adds a signpost to a due diligence path that already existed, and makes sure every buyer sees the signpost instead of only the ones who thought to ask.
The legislature has already revisited the language once. A further revised version of the same disclosure section is on the books to take effect January 1, 2027, which suggests Richmond is still calibrating exactly how this gets worded rather than treating the 2025 version as final. For a Sterling seller today, the practical effect is straightforward: a disclosure form that used to be silent on airport noise now flags it, and a buyer who used to have to think to check the county's overlay map now gets pointed there as a matter of routine paperwork.
Why the Same Market Gives You Different Numbers
Compare Sterling and Ashburn on a single, matched measure and the gap is real and sizable. Zillow's Home Value Index put Sterling's typical home value at $582,824 as of July 31, 2026, against $801,415 in Ashburn on the same date, a gap of roughly $218,000. Both figures come from the same index, calculated the same way, on the same day, which makes them the cleanest apples-to-apples comparison available.
Look only at Sterling and the picture gets less tidy, which is itself worth knowing before you lean on any single headline number. Redfin's three-month window ending June 2026 put Sterling's median sold price at $604,000, up 6.1 percent from the same period a year earlier, with homes taking a reported 29 days to sell versus 21 days the prior year. A separate Bright MLS-based report for the 30 days ending August 5, 2026 showed 78 closed sales at a $675,625 median, up 12.8 percent from the matched period a year earlier, with a median of 9 days to reach contract and a 100.21 percent sale-to-list ratio. Movoto's July 2026 figures put the median list price at $599,999, or $311 per square foot, with 213 homes sold that month versus 202 a year before.
| Measure | Window | Sterling | Year-over-year change |
|---|---|---|---|
| Zillow typical value | As of 7/31/2026 | $582,824 | down 1.8% YoY |
| Redfin median sold | 3 mo. ending 6/2026 | $604,000 | up 6.1% YoY |
| Bright MLS median sold | 30 days ending 8/5/2026 | $675,625 | up 12.8% YoY |
| Movoto median list | 7/2026 | $599,999 | volume up 5.4% YoY |
Four sources, four windows, and several different measures. The figures track different things: estimated typical value, median sold prices, median list price, and sales volume. When a narrow 30-day window shows a 12.8 percent jump, part of that can simply be a run of larger or more updated homes closing that month, not a broad shift in what any given house is worth. For a buyer comparing Sterling with Ashburn, the Zillow figures above give the matched same-day comparison; the other figures describe different Sterling measures and windows, so none should be read in isolation.
What This Means If You're Comparing Sterling to Ashburn
The zoning and the price data point to the same conclusion from two different directions. Part of Sterling's discount to Ashburn is construction age, as the conventional story goes. Part of it is that more of Sterling's land sits inside noise zones where residential development has been restricted or discouraged since the 1990s, a condition now spelled out in the disclosure paperwork rather than left to a buyer's own initiative to discover. Neither of these is a reason to avoid Sterling. Both are reasons to ask, street by street, which side of the overlay boundary a specific listing sits on before comparing its price to a home in Ashburn that carries no such designation at all.
Frequently Asked Questions
Does the Airport Impact Overlay District mean I cannot buy or finance a home in parts of Sterling? No. The overlay restricts new residential construction inside the highest noise tier, Ldn 65 and above, and imposes other land-use restrictions in the Ldn 60-65 band and one-mile buffer. Existing homes throughout the rest of the district can be bought, sold, and financed like any other property. The overlay is a land use designation, not a prohibition on resale.
Does the new disclosure law mean a seller has to admit their home is loud? No. The statute requires sellers to point buyers toward due diligence resources, primarily the county's overlay maps and the Virginia Department of Aviation's website. Virginia's caveat emptor framework still allows a seller to decline to characterize the noise personally.
How do I check whether a specific Sterling address sits inside the overlay before I write an offer? Loudoun County publishes the AIOD boundaries through its planning and zoning office, and the district's boundary data is also available as a public GIS layer through the county's open data portal. A quick check before an offer deadline can save a conversation later.
Is this only a Sterling issue? No. The county's 2023 amendment touches an estimated 59,000 properties across the district, which wraps around the airport and reaches into parts of Ashburn as well. Sterling simply carries a larger share of it given its proximity to the runways themselves.
If you are weighing a home in Sterling against one in Ashburn, or trying to read what a specific parcel's overlay status actually means for your offer, that is the kind of street-level detail worth a conversation before you write a number down. Rachel Van Zanten works these Loudoun County submarkets closely enough to walk you through it property by property. Let's Connect.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
