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Home/Mold Testing/Loudoun County, VA
Mold testing
Samples taken in your home, analysed by an accredited laboratory. We do not sell remediation, so the report has nothing to sell you.
4.9 rating, over 4,000 reviews NAMRI-certified inspectors Serving all of Loudoun County
Schedule a mold test Call (703) 450-6398 Find your community
Seven communities across the county have a page of their own with local detail. The packages, the prices and the laboratory are the same in every one of them, so you can also book straight from here.
Sterling's older subdivisions sit closest to the Potomac, with newer sections spreading toward the airport and the office parks.
Ashburn pairs decades-old subdivisions with recent construction still settling into its lots along the technology corridor.
South Riding's single master plan still produced several distinct lot types spread across one homeowners association.
Brambleton's phased construction means a villa, a townhome and a rowhouse can sit within sight of each other.
Purcellville's rebuilt Main Street sits close to farmhouses and newer subdivisions reaching toward the Blue Ridge foothills.
Leesburg and Purcellville are incorporated towns inside the county, not independent cities, so the same team, packages and prices reach them.
Four options, depending on how much of the home you need looked at. Not sure which one fits? Start with the thirty minute visit and a technician will tell you what is actually worth testing. Decide to test while they are there and the visit is written up as a Mold Plus.
No sampling
"Something feels off and I do not know if testing is worth it."
$175
30 minutes on site
One area, tested
"I can see it, or I know exactly where to look."
$345
One targeted area, 1 to 2 hours
One area, plus the source
"There was a leak and I want to know where the water went."
$495
One targeted area, 1 to 2 hours
The whole home
"It could be anywhere, or it keeps coming back."
From $550
Priced by home size, 1 to 2 hours
* Prices shown are for Virginia and Maryland. In Washington DC, Mold Basic is $425, Mold Plus is $575, and Mold Advanced starts at $630. Mold Walk & Talk is $175 everywhere.
Loudoun County's growth runs east to west. The Potomac River and the Route 7 and Dulles corridors carried subdivisions, townhouse courts and data centers eastward from the 1990s onward, while the county seat at Leesburg anchors an older core along Route 15. West of the Catoctin ridge the county turns rural, with fewer subdivisions, larger lots and a slower pace of construction that runs to the Blue Ridge crest. A booking anywhere in the county starts from the same two facts: how the house was built, and whether the property sits on public utilities or its own well and septic system.
Loudoun County's own geology pages describe a band of diabase rock south of Leesburg and near Dulles, and note that the shrink-swell clay soils that often sit above it can crack a foundation as they swell and dry with the seasons. A smaller karst area east of Catoctin Mountain along the Route 15 corridor north of Leesburg adds sinkholes and underground drainage to the list of ground conditions a technician checks before sampling. West of that ground, the more common path for water is simpler: a failing well seal, a septic field pitched toward the house, or a crawlspace under a farmhouse addition.
Local background: Loudoun County Government: Diabase, Loudoun County Government: Karst.
01
The county's diabase belt sits under shrink-swell clay that expands when wet and contracts when dry, and county records tie that movement to cracked foundations. A technician traces a crack to the grading outside before any sample is taken, and photographs the pattern for the report.
02
A mapped karst area near Route 15 north of Leesburg has underground cavities that can surface as sinkholes. Inside that strip, the visit includes a look at grading and any recent settling before a sample is taken, and the report notes whether the address falls inside the mapped area.
03
Homes west of the Catoctin ridge commonly run on a private well and a septic field rather than county utilities. A failed well seal or a drain field pitched toward the house changes where moisture starts, and the visit records which system serves the property before sampling begins.
We do not remove mold, so we have nothing to gain from your results. If your report shows a problem, you choose who fixes it. Once the work is done, we can test again and tell you what we find.
Virginia's residential disclosure statement advises buyers to exercise due diligence, including considering a mold assessment conducted by a business following EPA guidance. Confirm the scope and timing with your agent before settlement. A laboratory sample documents a selected place and time; it does not certify an entire home as mold-free or replace advice about your transaction.
Va. Code section 55.1-703. Current as of September 2026. General information, not legal advice.
Yes. The same team and pricing serve the full county, from the Dulles corridor towns in the east to Purcellville and the Blue Ridge foothills in the west. The community pages linked here add local detail, and any of them can start a booking for the same visit.
Yes, in almost every case. Leesburg and Purcellville are incorporated towns inside the county, not independent cities, so the same team, packages and price list apply. Give the full street address when booking so the report lists the correct town and county.
Not automatically. The county's own pages describe rock and clay that move with moisture and can crack a foundation, which is a structural pattern rather than proof of mold. The test measures what is actually in the air and on surfaces at the property, on any soil type.
Just make sure the crawlspace or well room is reachable and let us know which system serves the house when booking. The visit and the report work the same way whether the property is on public utilities or its own well and septic.
Real availability on the next screen. No call back required.
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
