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Home/Mold Testing/Great Falls, 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 Fairfax 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
"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, with $80 added to every home-size tier. Mold Walk & Talk is $175 everywhere.
Virginia's historic register for the Great Falls Grange Hall records the building was built in 1929 by members of a farmers' association, standing beside the Forestville School, a one-room schoolhouse from 1889 later enlarged in 1911. Both buildings, now held by the county park authority, are described as remnants of a dairy-farming landscape that gave way to large residential lots. That shift from farm to large lots still shows in how spread out Great Falls houses tend to sit, each often on its own well and septic system.
On a large, wooded lot in Falcon Ridge or Great Falls Estates, tell us whether the property uses a well and septic system, and describe the well pump room or equipment location relative to the affected area. In Locust Hill or The Reserve, a custom-built house may have complex rooflines and multiple additions; identify which section is affected. Near Great Falls Park in Hidden Springs, mature trees and a wooded lot can keep the ground and crawlspace damp longer after rain; mention how long the area has stayed wet.
Local background: Virginia DHR: Great Falls Grange Hall and Forestville School.
01
A well pump room or equipment closet on a large lot can hold moisture differently than a municipal utility connection. Describe the room's ventilation and any recent service history, along with its distance from the area of concern.
02
A custom home built or expanded in stages can have several rooflines meeting at different points. Identify which addition or wing is affected and describe when it was built relative to the rest of the house.
03
A detached garage, barn or guest structure on a large property has its own roof and foundation separate from the main house. Describe which building is affected and whether it is heated or conditioned year-round.
Where we test in Great Falls, and what to tell us
Falcon Ridge, Great Falls Estates
On a large wooded lot, describe whether the property relies on a well and septic system, and note the pump room or equipment location relative to the affected room. Distance from the Potomac alone does not indicate a moisture concern.
Locust Hill, The Reserve
For a custom-built estate home, identify which wing or section is affected and whether the roofline includes multiple valleys or additions. Equestrian outbuildings and detached structures are evaluated separately from the main house unless you describe otherwise.
Hidden Springs
Near Great Falls Park, mature trees can keep a crawlspace or lower-level area damp longer after rain. Describe how long the ground has stayed wet and whether the crawlspace vents are clear before the visit.
No version of your result is worth more to us than another one. If the report says you need work, you choose the remediator. A separate post-remediation assessment can document conditions after the work within its agreed scope.
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.
Start with where the concern sits. If it is one wing or one lower level, Mold Basic or Mold Plus can be scoped to that area, with Plus adding the moisture and thermal evaluation. Mold Advanced is the whole-home scope, which suits a house with several additions and more than one area in question. Describe the wings, the outbuildings and the rooms that prompted the call, and the office will confirm which fits.
The process is the same, but tell us your water source and where the septic system sits relative to the area of concern. A well pump room or nearby equipment closet is sometimes a useful area to describe as well, since it can hold moisture differently than the rest of the house.
Yes, that is common here. Describe the guest house or barn's construction, whether it is heated, and how it connects to utilities from the main house. A detached structure can be scoped on its own or alongside the main house, depending on what you want evaluated and where the concern was noticed.
Identify which wing or addition is affected and roughly when it was built relative to the rest of the house. A complex roofline with several junctions benefits from that history, since the technician can focus the visit on the area you describe rather than the entire structure.
Real availability on the next screen. No call back required.
Schedule a mold test Request a price
NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
