Find a Verified Mold Inspection & Testing Company

How to choose a mold inspection company

The wrong call here costs you twice: once for an inspection that overstates the problem, and again for the remediation scoped to fix what wasn't really there. Five things to check before you sign anything.

A real state license, specifically for assessment. Florida issues a Mold Assessor license through DBPR that's legally distinct from the Mold Remediator license; a remediator can't legally assess in Florida and the inverse is true too. Texas TDLR has separate Mold Assessment Consultant and Mold Assessment Technician credentials. New York DOS issues a Mold Assessor license. California doesn't license mold assessment specifically but requires a contractor's license for related structural work. If a company says "we don't need a license for inspections in this state," verify against the state agency before you trust that answer. We check the state license for every assessor and full-service company listed here.

Independence from any remediation company. The single most important credential. If the inspector profits from the removal, they have a reason to find more mold than exists. The companies on this list that ALSO do remediation are flagged on their profile so you can decide whether you want the combined service or want to hire a separate assessor. Most insurance adjusters strongly prefer the separate-assessor route because the documentation reads as independent.

IICRC S-520 familiarity, or better, a CIH or CIE credential. S-520 is the technical standard most remediators know; an inspector should at least know it cold. The higher credentials are CIH (Certified Industrial Hygienist, the gold standard for litigation or commercial work) and CIE (Certified Indoor Environmentalist). A CIH is overkill for a 1,200-square-foot residential inspection. It's the right call for a workplace exposure issue or a real-estate dispute heading toward litigation.

Air and surface sampling capability with a lab-accredited partner. Tape lifts, swabs, bulk samples, air-cassette spore traps. The samples themselves cost nothing meaningful; the lab analysis is what you're really paying for. Ask which lab the inspector uses and whether that lab is AIHA-LAP accredited. The accreditation is what makes the report defensible to insurance.

A written protocol delivered as a deliverable. Not a verbal walkthrough at the end of the visit. A document that names every affected area, the sample results, the species identified, the recommended containment level, and the scope of work the remediator should follow. If they won't put it in writing, the inspection isn't worth what you paid for it.

What a mold inspection company actually does: the 5-step protocol

A real assessment isn't a walkthrough with a flashlight. There's a sequence that produces a defensible report.

For the homeowner-side decision on whether to test at all versus DIY first, see the DIY vs professional testing decision tree.

Why hire a different company for testing than for removal

The cheap-fast-easy path is to hire one company that handles both. The reason most insurance adjusters, IICRC-certified remediators, and real-estate attorneys recommend against it comes down to three things.

The conflict of interest is real and well-documented. The company that profits from removing the mold has a financial reason to find more mold than exists. Florida codified this into law: in Florida, a single licensed person or company cannot legally perform both assessment and remediation on the same property. That's not a Florida-specific problem. That's a Florida-specific solution to a problem every state has.

The insurance documentation reads differently. An independent assessor's report is something an adjuster trusts as third-party evidence; a remediator's "we inspected and found extensive mold" memo is something an adjuster reads as a sales pitch. Same words, different credibility. When an insurance claim runs into pushback, the independence of the assessment is the lever that gets the claim paid. Read more about why an independent inspection and remediation pair matters for documentation.

The post-job clearance has to come from somewhere. Whoever does the removal cannot credibly clear their own work. The clearance test (Step 5 above) is the homeowner's confirmation that the job actually worked, and it only works as confirmation if the testing is independent of the doing. Hire one company for both and the clearance loses its meaning.

The combined-service offer sometimes makes sense. A very small, isolated, clearly-visible job under 10 square feet doesn't need third-party documentation. A whole-house job after flooding, a real-estate transaction, or any work likely to involve insurance does. Default to separate companies unless the job is small enough that the documentation overhead isn't worth it.

How much does a mold inspection cost?

Most professional mold inspections run between $400 and $800. A visual-only walkthrough with no sampling comes in lower; a whole-house assessment with thermal imaging and multiple sample types runs higher.

Visual-only inspection, no sampling.$200 to $400. Useful if you already know where the problem is and just need an expert eye and a written protocol. Less useful if you're trying to figure out whether you have a problem at all.

Inspection plus 2 to 3 air samples. $400 to $800. The typical residential price for a real assessment. Two interior samples plus one outdoor baseline is the most common configuration; the outdoor sample is what gives the interior samples meaning.

Whole-house inspection plus 6 to 10 samples plus thermal imaging. $800 to $1,500. The right scope for a real-estate transaction, an insurance claim involving multiple rooms, or a job where the source of moisture isn't obvious.

Post-remediation clearance testing.$300 to $600. Billed separately after the remediator finishes. This is the step most homeowners skip because they don't realize it's separate. Skipping it is the most common reason people end up paying for a second remediation six months later.

The variables that move the price: square footage, number of samples, lab turnaround time, whether the assessor brings a thermal imager, and whether the report needs to be in expert-witness-ready format for litigation. For the full state-by-state breakdown of inspection pricing, see our mold inspection cost guide.

Mold inspection services we cover

The verified companies on this list handle the full range of inspection and testing work. Most jobs fall into one of these categories.

Indoor air quality testing services

The umbrella term for any inspection that puts the focus on what you're breathing, not just what you're seeing. Air-cassette spore traps are the core deliverable; a thorough assessment also samples for VOCs and other airborne contaminants when the symptoms suggest more than mold. Indoor air quality testing services are what's relevant when someone in the household has unexplained respiratory symptoms, asthma flaring up at home but not at work, or a doctor who specifically asked for indoor air testing.

Attic mold inspection services

Attic mold often shows up as black staining on the underside of roof sheathing. The cause is almost always inadequate ventilation, a roof leak, or both. An inspection here includes an insulation check (wet insulation is a leading indicator) and a ventilation assessment. The remediation scope usually includes ventilation repair, not just mold removal.

Crawl space mold inspection services

Crawl spaces are the most-missed source of household mold. The signs show up upstairs (musty smell in floor vents, allergy symptoms that get worse when the HVAC kicks on) but the work happens in a three-foot tall dirt space few homeowners ever enter. The inspection typically includes moisture readings on the wood framing, sometimes a vapor barrier check, and air sampling from the crawl space itself.

Black mold inspection services

The species most people are searching for is Stachybotrys chartarum. Confirming it requires lab analysis; you can't reliably species-ID by sight. A black mold inspection follows the same protocol as any other but the containment level recommended in the report tends to be a step higher, and the disturbance protocol is stricter. Don't poke it. Have it tested first.

Pre-purchase and real-estate mold inspection

A pre-purchase inspection is its own thing. The report needs to be in a format the buyer can use during the option period, the seller can negotiate against, and the lender can underwrite to. Most general home inspectors will flag "possible moisture" in a few areas; a specialized mold inspector confirms what's actually there. The cost is small compared to the surprise of buying a house with a $20,000 remediation bill hidden in the crawl space.

Post-remediation clearance testing

The independent confirmation that the remediation worked. Run by the same assessor who scoped the job. New air samples, compared to the outdoor baseline. If indoor matches outdoor, the job passes. This is the step that turns "the remediator says they're done" into "the lab confirms the work is done."

Why choose a verified mold inspection company

Most directories sell your contact info to anyone who pays. Verified Remediation is different. We check the credentials first, list the company second.

The floor that every provider on this list passes: state license verified against the state database. Not self-reported. We scrape state licensing boards and confirm the assessor license is active. If your state has separate assessor and remediator credentials (Florida, Texas, New York have the clearest examples), the relevant license type is what's checked.

The earned status (Trust Tier A) adds three more checks: active E&O (errors and omissions) insurance verified by certificate, a 4.0+ star rating across 5+ aggregated reviews, and enough tenure on the platform to demonstrate consistency. E&O is the right policy for assessment work because the assessor's product is a professional opinion; pollution liability is the remediator's policy. The two trades carry different coverage for a reason.

The honest disclosure:Trust Tier A is a small group right now. Maybe a dozen companies platform-wide. The verification floor is what protects you on every call you make through this site; the earned status is what comes from operational momentum that takes a few quarters to build. We'd rather tell you the truth about that than inflate the number.

A contractor can't pay to skip the check. That's the difference.