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Mold testing

Mold Testing in Montgomery County, MD

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 Montgomery County

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From our customer reviews.

These guys were very professional. Showed up on time and completed a mold inspection on schedule.

I hired Next Day Inspect to do a mold inspection on two houses. Scheduling was easy.

I got the results of my mold inspection in a reasonable timeframe. No issues.

Polite, knowledgeable, friendly Quick results for just an air mold test

Booking service was easy. The technician was friendly and efficient. Recommend for mold testing.

Where we test in Montgomery County

Fourteen 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.

Bethesda to Takoma Park, near the District line

  • Bethesda

    Bethesda mixes postwar brick colonials with condominium towers, so a building's age often changes more block to block than mile to mile.

  • Chevy Chase

    Chevy Chase's early planned streets now fall under several separate town governments, each with its own permitting history.

  • Silver Spring

    Silver Spring runs from a dense downtown core out to older streetcar-era suburbs and basement apartments carved into single family houses.

  • Takoma Park

    Takoma Park's tree-lined streets carry Victorian-era frame houses, brick bungalows and garden apartments within a few blocks of each other.

  • Kensington

    Kensington's Victorian rail suburb core gives way to postwar streets built closer to Rock Creek Park's stream valley.

Central Montgomery: Rockville to Potomac

  • Rockville

    The county seat spans a historic downtown, mid-century neighborhoods and newer construction around the Town Center and King Farm.

  • Aspen Hill

    Aspen Hill's Georgia Avenue corridor pairs older garden apartments with single family streets from several different building decades.

  • Potomac

    Potomac's large lots along the river and its rustic roads sit farther from public water and sewer lines than most of the county.

The I-270 corridor

  • Gaithersburg

    Gaithersburg's planned communities and older downtown sit along the I-270 corridor, with houses from many different decades close together.

  • Germantown

    Germantown's subdivisions arrived in successive waves after the interstate corridor opened, so a house's age can vary sharply within one neighborhood.

  • Clarksburg

    Clarksburg anchors the I-270 corridor's north end, where an older crossroads village sits beside a still-expanding planned town center.

  • Montgomery Village

    Montgomery Village's original neighborhoods sit around its planned lakes and parks, while apartment and condominium buildings fill in the newer sections.

Up-county: Olney and Damascus

  • Olney

    Olney grew up around a nineteenth century crossroads, and its newer subdivisions now sit between long-held farmland and the town center.

  • Damascus

    Damascus sits at the edge of the county's Agricultural Reserve, where newer townhomes meet older farmhouses along the stream valleys.

Rockville, Gaithersburg and Takoma Park are incorporated cities inside the county, and Chevy Chase divides into several small municipalities plus an unincorporated area. All of them are served the same way, with the same packages and prices.

How much does mold testing cost in Montgomery 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 Montgomery County homes

For mold testing in Montgomery County, start with the affected space: a Bethesda basement, a Silver Spring apartment wall, or a musty room in Germantown. Tell us what you can see or smell, when it began, and whether a leak or water entry is known. The county address establishes coverage; the room and moisture history shape the visit.

Before booking, describe any drying or repairs and confirm access to the area of concern. A shared wall, finished basement, or separate building can limit what is visible during one appointment. The selected package defines the work, and a sample from one location cannot certify every concealed surface in a home.

Mold guidance: U.S. EPA on when mold sampling is useful.

A glass and brick office tower under construction at dusk, with a Chase bank at street level and traffic signals in the foreground of a downtown intersection

01

Basement and lower-level moisture

For a Montgomery County lower level, identify the exact wall or room, whether water appears after rain, and any sump, drying, or repair history. Those facts help the technician focus on the reported condition.

02

Apartments and shared plumbing

In a Silver Spring, Rockville, or Gaithersburg unit, describe the stain or odor and any known plumbing leak. Another unit or concealed shared cavity is not automatically included; arrange permission and access before expanding the scope.

03

Separate buildings and utility spaces

For a Potomac, Olney, or Damascus property with a detached building or well equipment room, name the structure with the concern. Confirm whether it is part of the booked mold visit; water quality and equipment performance are separate questions.

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 mold testing in Maryland

Tell us which room or unit is affected, what you can see or smell, and the history of any water entry, drying or repairs. Ask which package includes the evaluation or laboratory samples needed for your question. If you need a report for a sale or repair deadline, confirm appointment options and expected laboratory turnaround with the office before relying on that date.

EPA: Is sampling for mold necessary?

Mold testing in Montgomery County, answered straight

Do you test for mold across all of Montgomery County?

Yes. Every community on this page, from Bethesda and Silver Spring near the District line to Damascus and Clarksburg near the county's northern edge, is inside the regular service area, and the pricing does not change by zip code. Book from this page or from any single community's page; both routes reach the same team.

Can you assess a damp wall in a Montgomery County condo or townhouse?

Yes, within the accessible unit and selected package. Tell us which room or wall is affected, any known leak, and who can provide access. A neighboring unit or concealed shared space needs separate permission and scope.

My Potomac house is on a private well. Does that change what gets tested?

A private well does not by itself establish a need for mold sampling. Tell the office if the concern is in a room, near pump equipment or in a separate building. Drinking-water testing and well or septic evaluation are separate services, and additional spaces are not automatically included with a mold package.

When would sampling help with a Montgomery County mold concern?

Sampling should answer a defined question about selected locations. EPA says it is often unnecessary when mold growth is already visible. Describe the moisture problem first; the technician can explain whether a consultation, targeted visit, or wider evaluation fits it.

Book a mold test in Montgomery County

Start scheduling your mold test online, or request a quote for the right package.

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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398

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