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Home/Mold Testing/Herndon, 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.
Herndon's designated historic district sits alongside surrounding residential communities. When booking near downtown, Franklin Farm or Herndon Chase, describe the property's construction and any additions rather than relying on its mailing address to define the scope.
For a historic property, the way a wall dries can change when modern insulation or finishes are added. In a later house, the relevant history may be a window replacement or a bathroom fan repair. Bring the dates and photographs you have. The technician can use that information to choose areas for evaluation and explain when a concealed condition needs access beyond what a non-invasive appointment includes.
01
New finishes can change drying in an existing wall. Describe what was installed if an odor or stain appeared after renovation.
02
Windows, siding and sealants need individual condition checks. The useful question is where water is entering now, rather than whether every original component needs replacement.
03
A bathroom fan discharging into an attic can add moisture there. Safe access and the visible duct route determine how much can be assessed during the visit.
Where we test in Herndon, and what to tell us
Downtown Herndon
For a downtown property, identify older finishes that should remain undisturbed. Sampling can be planned around accessible surfaces while documenting areas that cannot be evaluated.
Franklin Farm, Herndon Chase
For a house with replacement siding or windows, describe the sequence of repairs. Similar installation dates do not establish that every component is failing.
Four Seasons, Reston-Herndon Junction
For attached housing, note whether the suspected source involves shared structure. Arrange any common-area access with the responsible owner or association before the appointment.
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.
Call to discuss the building and intended use of the results. Commercial, multi-tenant and office concerns need a defined scope and access arrangements beyond a standard residential booking. Identify the affected spaces and any landlord or insurer requirements so the proposal describes what will be assessed and what remains outside the visit.
The report identifies the sampled locations, laboratory findings and relevant observations within the selected package. Where moisture and thermal evaluation are included, those observations help interpret the concern. Ask about any particular documentation needed for a Herndon property before booking; the report should also make access limits and unassessed areas clear.
Do not assume the fan is the only cause. Persistent ceiling growth can warrant investigation of humidity, exhaust operation and leaks. EPA notes that visible mold often does not need sampling to establish that cleanup and moisture correction are needed. A consultation can help define an appropriate next step without automatically adding laboratory work.
The sample plan should follow the question, affected spaces and conditions at the visit. A comparison sample may be important for interpreting air results, and separate areas may justify additional samples. Ask the technician to explain the locations and charges before collection. A fixed count alone does not establish whether an assessment is adequate.
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
