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Mold testing
Mold Testing in Loudoun County, VA
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
Where we test in Loudoun County
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.
Eastern Loudoun and the Dulles corridor
- Sterling
Sterling's older subdivisions sit closest to the Potomac, with newer sections spreading toward the airport and the office parks.
- Ashburn
Ashburn pairs decades-old subdivisions with recent construction still settling into its lots along the technology corridor.
- South Riding
South Riding's single master plan still produced several distinct lot types spread across one homeowners association.
- Brambleton
Brambleton's phased construction means a villa, a townhome and a rowhouse can sit within sight of each other.
Leesburg and the Potomac
Western Loudoun toward the Blue Ridge
- Purcellville
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.
How much does mold testing cost in Loudoun County?
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
Mold Walk & Talk
"Something feels off and I do not know if testing is worth it."
$175
30 minutes on site
- Time with an environmental technician
- Moisture meter and thermal camera
- Findings explained on the spot
- Each additional 30 minutes $95
- No samples or laboratory work
One area, tested
Mold Basic
"I can see it, or I know exactly where to look."
$345
One targeted area, 1 to 2 hours
- Indoor sample plus outdoor comparison
- Accredited laboratory analysis
- Written laboratory report
- Additional samples $95 each
One area, plus the source
Mold Plus
"There was a leak and I want to know where the water went."
$495
One targeted area, 1 to 2 hours
- Everything in Mold Basic
- Moisture and thermal evaluation of the area
- Read Your Mold Report guide
- Each additional area $50 plus its $95 sample
The whole home
Mold Advanced
"It could be anywhere, or it keeps coming back."
From $550
Priced by home size, 1 to 2 hours
- Whole home moisture and thermal evaluation
- Sampling in the areas that call for it
- Read Your Mold Report guide
- Post-remediation re-test $295 held 3 months
* 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.
Where moisture can hide in Loudoun County homes
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. When booking, describe the building type and any known leak, drainage or private-utility concern.
Loudoun County's geology pages describe diabase-related shrink-swell soils and a mapped karst area near the Route 15 corridor north of Leesburg. These sources concern geology, not the likelihood of mold in a particular house. A damp farmhouse addition, a basement near Dulles and a room beside well equipment each need their own history and access details; the selected package determines the visit's scope.
Local background: Loudoun County Government: Diabase, Loudoun County Government: Karst.
01
Diabase clay south of Leesburg and near Dulles
Loudoun's geology guidance links diabase-derived clay with shrink-swell concerns. If your home near Leesburg or Dulles has cracking and dampness, describe both when booking. Mold sampling does not establish the cause of a foundation crack; structural questions may need a separate qualified professional.
02
The Route 15 karst strip north of Leesburg
The county maps a karst area north of Leesburg near Route 15. A map can provide regional context, but it cannot diagnose the ground beneath your house. Mention known settling or drainage concerns separately from the room you want evaluated for mold; geotechnical work is a separate scope.
03
Well and septic country west of the ridge
For a western Loudoun property using private water or wastewater systems, describe any known leak and the room affected. A mold package does not automatically include the well, pump equipment or drain field. Ask the office to distinguish those separate concerns before selecting a visit.
We only perform testing, not remediation.
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.
Before you book in Virginia
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.
Mold testing near Loudoun County
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Mold testing in Loudoun County, answered straight
Do you cover every part of Loudoun County, from Sterling to Purcellville?
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.
My house has a Leesburg or Purcellville mailing address. Is it still inside Loudoun County?
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.
Does living on the diabase belt near Dulles mean a house is more likely to have mold?
Not automatically. The county's geology pages describe soil movement and foundation concerns, not a mold diagnosis. If you notice staining, odor or a known moisture problem, describe that specific concern. Any sampling needs an appropriate purpose; a result from selected locations does not certify the whole property.
Do I need to do anything special before a visit to a well-and-septic property in western Loudoun?
Tell the office which room concerns you, whether the property uses private utilities, and whether access is limited. Follow the preparation instructions for the package you select. Do not open an unsafe crawlspace or assume well and septic evaluation is included with mold testing.
Book a mold test in Loudoun County
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398