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Mold testing
Mold Testing in Washington, DC
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 Washington, DC
How much does mold testing cost in Washington?
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."
$425
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."
$575
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 $630
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 Washington DC. Additional sample, area and consultation-time charges are shown above.
Where moisture can hide in Washington homes
A Washington DC mold concern may involve a rowhouse, an English basement, a condominium or a detached home. Identify the affected rooms and any shared-wall, plumbing or access issues before choosing a testing appointment.
For a converted lower level, record when dampness appears and what is known about drainage and ventilation. For a rowhouse, a stain beside a party wall or below a low-slope roof may need cooperation beyond the individual room. The building type does not prove a moisture source. DC also has specific landlord-response and professional-licensing rules, so clarify the purpose and scope of the assessment before booking work intended for a housing complaint.
Local background: DOEE: current mold information for tenants, DC Department of Buildings: housing inspections.
01
Cellar conversions
A converted cellar can have moisture from drainage, plumbing or indoor humidity. Start with the location and timing of the concern rather than assuming a particular remedy.
02
Party walls
A party wall may make access to a suspected source difficult. Coordinate with the responsible parties; a sample in one property cannot establish conditions throughout another.
03
Flat and low-slope rowhouse roofs
On a low-slope roof, a leak can travel before it appears indoors. Repair records and the position of ceiling stains help guide further investigation.
Where we test in Washington, and what to tell us
Capitol Hill, Shaw, Georgetown
For a Capitol Hill, Shaw or Georgetown property, describe cellar access, party walls and later finishes. The assessment should distinguish visible evidence from concealed areas it cannot reach.
Columbia Heights, Petworth
For a Columbia Heights or Petworth basement apartment, identify the affected room and the dates of written notices or repairs. Ventilation and water entry should both be considered.
Brookland and the detached streets
For a Brookland detached or semi-detached home, describe exterior drainage and any lower-level concern. A separate house can still require investigation of more than one moisture route.
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 the District
DC requires a residential property owner receiving written or electronic notice from a tenant of mold or suspected mold in a dwelling or common area to inspect within seven days and remediate within thirty days of the inspection, unless a court or the Mayor orders a shorter period. DOEE states that assessment and remediation involving ten square feet or more of indoor growth must be performed or supervised by a DOEE-licensed professional. Call to confirm the professional and required scope before booking a regulatory assessment.
D.C. Code section 8-241.04; DOEE tenant mold guidance; DOB housing inspections. Current as of September 2026. General information, not legal advice.
Mold testing near Washington
Mold testing in Washington, answered straight
I am a DC tenant and I reported mold to my landlord. What are they required to do?
After a residential property owner receives your written or electronic notice of mold or suspected mold in your dwelling or a common area, D.C. Code section 8-241.04 requires inspection within seven days and remediation within thirty days of that inspection, unless a court or the Mayor orders a shorter period. Keep your notice and repair records. Report unresolved rental-housing mold violations to the Department of Buildings (DOB); DOEE licenses and regulates mold professionals. A private testing report does not replace the agency's process.
Is mold testing more expensive in Washington DC?
The District runs on its own pricing, and the DC prices are the ones shown above. The thirty minute walk and talk is the same price in every market, and Mold Advanced is priced by the size of the home.
My English basement tenant says the unit is damp. Where do I start?
Keep the tenant's written notice and arrange a timely assessment of the reported concern. A lower-level room may have drainage, plumbing or humidity issues, and more than one may be involved. Confirm the required professional scope for the size and circumstances of the growth; do not assume that a dehumidifier alone resolves a mold complaint.
How do I confirm the DOEE licence needed for my DC mold assessment?
Call before booking to confirm the assigned professional's current DOEE licence and the scope required for your job. DOEE states that assessment and remediation of ten square feet or more of indoor mold growth must be performed or supervised by a licensed professional. Do not treat a general training certification as that licence.
Book a mold test in Washington
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398