How to Choose a Mold Remediation Contractor (and the Red Flags)

Choose a mold remediation contractor the way regulators do: keep the company that tests separate from the company that removes, verify a state license where your state issues one, ask for proof of general liability insurance with mold coverage (Florida requires at least $1 million), and demand a written scope with containment, negative air, HEPA cleanup, disposal, and an independent clearance inspection. Walk away from anyone who pressures you to sign today, wants cash up front, or offers a “fog and paint” fix without diagnosing the moisture source.

This guide shows you how to vet a company in about an hour, which credentials mean something, what a real scope looks like, and the eight red flags that separate remediation from a sales pitch. If nobody has inspected the problem yet, start with our mold inspection guide and what an inspection costs.

Step 1: Separate the tester from the remediator

The biggest problem in this industry is a company that “finds” mold, sells the removal, and then declares its own work clean. Three states have written that conflict into law.

Florida Statute 468.8419 prohibits a mold assessor from any attempt to “Perform or offer to perform any mold remediation to a structure on which the mold assessor or the mold assessor’s company provided a mold assessment within the last 12 months.” The same statute bars remediators from the reverse, and bars both sides from paying or accepting referral compensation.

Texas Occupations Code 1958.155 is shorter: “A license holder may not perform both mold assessment and mold remediation on the same project.” Texas also says a person “may not own an interest in both the entity that performs assessment services and an entity that performs remediation services on the same project.”

New York’s Department of Labor describes its mold program as providing “Protection against fraud by prohibiting the performance of both the assessment and remediation on the same property by the same individual.”

Everywhere else the conflict is identical, just legal. Hire one company to inspect and write the protocol, a different company to do the work, and bring the first back for clearance.

Ask the inspector whether they also remediate, and ask the remediator who does the clearance. The right answers are “no” and “an independent assessor.”

Step 2: Verify the license, where one exists

Only a handful of states license mold work, so “licensed” means different things depending on where you live. Our state-by-state mold laws page covers all 50 states. Here are the main licensing states, from the agencies themselves.

Florida’s DBPR “is responsible for licensing and regulating mold assessors and mold remediators,” and because the statute defines remediation at “greater than 10 square feet,” almost any job you would hire out needs a license. Look up both the company and the individual before you sign.

Texas adds a step worth knowing: after the job, the remediator must deliver a Certificate of Mold Damage Remediation “Not later than the 10th day after the date on which a license holder completes mold remediation,” with a licensed assessor confirming the work matched the protocol. Keep it. Texas sellers must give buyers every certificate issued “during the five years preceding” a sale.

New York makes it “unlawful for any contractor to engage in mold assessment on a project” without a state license and licenses remediators under the same program. Louisiana’s classification “Requires twenty-four hours of board approved training in mold remediation and assessment.”

In states with no mold license, check for a general contractor license if the job involves demolition, and lean harder on the certifications and insurance below.

Step 3: Know which certifications carry weight

A badge on a truck is not a credential. Two organizations run programs that are independently accredited and actually tested.

IICRC

The Institute of Inspection, Cleaning and Restoration Certification publishes the standard the industry works to: “IICRC Standards are internationally recognized, ANSI-accredited guidelines that define best practices for inspection, cleaning, and restoration work.” The mold document is the ANSI/IICRC S520 Standard for Professional Mold Remediation, fourth edition (2024). It “describes the procedures to be followed and the precautions to be taken when performing mold remediation in residential, commercial, and institutional buildings,” including post-remediation verification.

The technician credential is the Applied Microbial Remediation Technician (AMRT), which “covers mold and sewage remediation techniques.” Ask whether the person supervising your job holds it, not just the owner.

ACAC

The American Council for Accredited Certification does not sell training. It states that it “develops no training or prep courses” and that its “certifications are board awarded, never staff awarded.” Its programs are “the ONLY designations in the indoor air quality field to earn CESB accreditation.”

For remediators the designations are Council-certified Microbial Remediator (CMR) and Remediation Supervisor (CMRS). Candidates must “Demonstrate verifiable field experience in microbial remediation,” pass an exam, and earn unanimous board approval. On the inspection side, a Council-certified Microbial Investigator (CMI) “can perform mold inspection, mold testing and bioaerosol sampling” and design the remediation protocol.

What does not count

• A “certified mold specialist” badge from a one-day online course or a franchise.
• “EPA certified.” The EPA does not certify mold contractors; it publishes guidance.
• Certification by the manufacturer of an antimicrobial spray.
• Membership in an association with no exam.

Verify any credential on the issuing body’s own website, not from a PDF the contractor emails you.

Step 4: Ask for the insurance certificate

Two policies matter, and the second is the one most people miss.

General liability. Florida’s statute is a useful benchmark anywhere: a remediator “shall maintain a general liability insurance policy in an amount of not less than $1,000,000 that includes specific coverage for mold-related claims.” Florida assessors must carry “general liability and errors and omissions” coverage of at least $1 million.

Pollution or environmental liability. That phrase “specific coverage for mold-related claims” exists because standard general liability policies exclude mold. Restoration & Remediation Magazine’s insurance buyer’s guide puts it plainly: “If your general liability insurance policy is not in a package with contractors environmental liability insurance, you will have that mold/bacteria job site exclusion in your policy.”

Ask for a certificate of insurance and read the coverage lines. If the only policy is general liability with no fungi or pollution coverage, a botched job that spreads spores through your HVAC is not insured. Confirm workers’ compensation too.

Step 5: Read the scope before you sign

A legitimate job has a written protocol from the independent assessor, and the contractor’s scope should follow it. Here is what belongs in it, drawn from EPA guidance.

Moisture source first. EPA: “You must have completely fixed the water or moisture problem before the cleanup or remediation can be considered finished.” The scope should name the source and who is fixing it. A scope with no moisture diagnosis is the number one reason mold comes back.

Containment. “Limited containment is generally recommended for areas involving 10 to 100 square feet of mold contamination,” using a single layer of 6-mil polyethylene sheeting. Full containment is recommended above 100 square feet and “requires double layers of polyethylene sheeting” plus an airlock.

Negative air. “Maintaining the containment area under negative pressure will keep contaminated air from flowing into adjacent, uncontaminated areas and possibly spreading mold.” The scope should state that negative air machines will run and exhaust outside.

HEPA cleanup. EPA recommends HEPA vacuums “for final cleanup of remediation areas after materials have been thoroughly dried and contaminated materials removed.” A rag wipe-down is not remediation.

Removal and disposal. Porous materials with growth, such as drywall and insulation, generally come out. The scope should say what is removed and how debris is bagged and carried out.

Post-remediation verification. The last line item is an independent clearance before containment comes down. EPA’s completion criteria: “Visible mold, mold-damaged materials, and moldy odors should not be present.” EPA also warns that “a negative sampling report must not be used in place of a visual survey,” so clearance is a visual and moisture inspection first, with air sampling as a supplement.

The eight red flags

Any one is a reason to slow down. Two or more is a reason to call someone else.

1. The “free” inspection turns into a five-figure quote. A company that gives away the inspection makes its money on the remediation.
2. Fear language. CDC describes mold exposure as leading to “symptoms such as stuffy nose, wheezing, and red or itchy eyes, or skin,” with more severe reactions possible for people with asthma, mold allergies, or weakened immune systems. That is a reason to fix the problem properly, not to sign tonight. See our black mold page.
3. Pressure to sign today. The Federal Trade Commission lists “Scammers pressure you for an immediate decision” as a hallmark of home improvement scams.
4. No moisture source diagnosis. EPA: “don’t forget to address the source of the moisture problem, or the mold problem may simply reappear!”
5. “Fogging only” or “spray and paint.” Killing mold does not remove it. EPA notes that “Whether dead or alive, mold is allergenic.” Painting over growth hides it until the next inspection. Read why bleach is not a remediation plan either.
6. No clearance testing, or the remediator does its own. A company grading its own work is not verification.
7. Cash only, or full payment up front. FTC: “Scammers ask you to pay for everything up front or only accept cash.” Its advice is “Don’t pay the full amount for the project up front” and “never make the final payment until the work is done and you’re satisfied with it.”
8. No written contract, or one with no license number. The FTC says a contract should include “the contractor’s name, address, phone number, and license number,” “an estimated start and completion date,” and every promise made about scope and cost.

One more tell from the FTC: “Scammers ask you to get any required building permits.”

Twelve questions to ask before you hire

Ask by phone or email and keep the answers.

1. Do you also perform mold assessment or testing?
2. Who writes the remediation protocol, and can I see it before work starts?
3. What is your state license number, and under whose name is it held?
4. Who is the on-site supervisor, and what certifications do they personally hold (AMRT, CMR, CMRS)?
5. Can you send a certificate of insurance showing general liability, pollution or environmental liability with fungi coverage, and workers’ compensation?
6. What is the moisture source, and who is fixing it?
7. What containment level will you set up, and will the work area be under negative pressure with exhaust outside?
8. Which materials are being removed, and how far past the visible growth?
9. How will debris be bagged and removed, and will adjacent surfaces be HEPA vacuumed?
10. Who performs post-remediation verification, and what happens if it fails?
11. What is the payment schedule, and what is the final payment tied to?
12. Do you follow ANSI/IICRC S520, and will the contract say so?

Score each bidder on the same questions using our mold checklist, and get at least three written estimates, each with “a description of the work to be done, materials, completion date, and the price,” as the FTC recommends.

How to check complaints

• State licensing board. The agencies above show license status and discipline. Texas uses the “TDLR License Data Search (Active Licenses only).” Elsewhere, check the contractor licensing board.
• Attorney general and consumer protection office. The FTC advises you to “Check with the local Home Builders Association and consumer protection officials to see if they have complaints against a contractor.”
• Better Business Bureau. Useful for patterns of unresolved complaints, not as an endorsement.
• Recent references. Ask for two similar jobs from the last few months and whether clearance passed the first time.
• Report fraud to the FTC at ReportFraud.ftc.gov and to your state attorney general.

Cost and payment structure

A separate inspection with a written protocol typically runs $300 to $600, and clearance is a second visit; see our inspection cost page and remediation cost calculator to spot an inflated bid. Pay in stages: a deposit at signing, a progress payment after containment and demolition, and the balance after independent clearance passes. If your homeowners policy is involved, read our mold insurance claim guide first.

Final Thoughts from Brad

The clearance inspections that fail almost never fail because the crew was lazy. They fail because nobody diagnosed the water. The contractor removed drywall, ran air scrubbers for three days, and the wall got wet again the next time it rained. Look for the sentence in the estimate that names the moisture source. If it is not there, the estimate is incomplete.

The other pattern is the bundled deal: one company, one truck, “we’ll test it, fix it, and clear it.” In Florida that is illegal, and in most states it is simply bad practice. Pay an independent assessor for the protocol and the clearance, and let remediators compete on the work in between.

Do not let a salesperson set your timeline. Mold that has been there for months is not an emergency tonight. Get three bids, verify the license and insurance yourself, and hire the company that answered the twelve questions without flinching.

Frequently Asked Questions

Can the same company test for mold and remove it?

Not in Florida, Texas, or New York, where state law bars the same company or individual from assessing and remediating the same property. Elsewhere it is legal but still a conflict of interest, so use separate companies for inspection, remediation, and clearance.

Which states require a mold remediation license?

Florida, Texas, New York, and Louisiana run state mold licensing programs, with Florida’s requirement starting above 10 square feet and Louisiana’s above $7,500 in job value. Most other states have no mold-specific license, so certifications, insurance, and references matter more there.

What insurance should a mold remediation contractor have?

General liability that specifically covers mold-related claims, pollution or environmental liability with fungi coverage, and workers’ compensation. Florida requires at least $1 million in general liability with mold coverage. Standard general liability policies exclude mold, so read the certificate of insurance.

What certifications should I look for?

The IICRC Applied Microbial Remediation Technician (AMRT) and the ACAC Council-certified Microbial Remediator (CMR) or Remediation Supervisor (CMRS) are independently accredited and exam-based. Verify them on the IICRC or ACAC website. A badge from a one-day course, a product manufacturer, or a franchise is not a credential.

Is fogging or spraying a legitimate mold remediation method?

Not on its own. EPA guidance says mold is allergenic whether dead or alive, so killing it without removing it and fixing the moisture source leaves the problem in place. A contractor offering fogging or spray-and-paint as the whole job is a red flag.

Does mold remediation need clearance testing?

Yes, by an independent assessor rather than the remediator. Clearance is a visual and moisture inspection confirming no visible mold, no moldy odor, and a fixed water source, with air sampling as a supplement. EPA warns that a negative sampling report must not replace a visual survey.

How much should I pay up front?

Not the full amount. The FTC advises against paying everything up front and against making the final payment until the work is done and you are satisfied. Pay a deposit at signing, a progress payment after containment and demolition, and the balance after independent clearance passes.

Sources

• Florida Statute 468.8419 Prohibitions; penalties — assessor may not remediate a structure it assessed within 12 months; referral compensation banned
• Florida Statute 468.8411 Definitions — mold assessment and remediation defined at greater than 10 square feet
• Florida Statute 468.8421 Insurance — $1 million general liability with mold coverage for remediators; assessor E&O
• Florida DBPR Mold-Related Services — DBPR licenses and regulates mold assessors and remediators
• Texas Occupations Code 1958.155 Conflict of Interest — a license holder may not perform both assessment and remediation on the same project
• Texas Occupations Code 1958.154 Certificate of Mold Remediation — certificate within 10 days; five-year disclosure at sale
• TDLR Mold Assessors and Remediators — Texas definitions of assessment and remediation; license categories
• TDLR License Data Search — how to verify a Texas license
• New York DOL Mold Program — license required; same individual may not assess and remediate the same property
• LSLBC Mold Remediation classification — Louisiana license above $7,500; 24 hours of training
• EPA: A Brief Guide to Mold, Moisture and Your Home — fix the water problem before remediation is finished; check contractor references
• EPA: Mold Cleanup in Your Home — 10 square feet DIY threshold; hire experienced contractors following EPA, ACGIH, or IICRC guidelines
• EPA Mold Course Chapter 6: Containment and PPE — limited and full containment, negative pressure
• EPA Mold Course Chapter 7: Evaluating the Remediation — completion criteria; sampling does not replace visual survey
• EPA Mold Remediation in Schools and Commercial Buildings, Chapter 3 — HEPA vacuums for final cleanup; dead mold is allergenic; address the moisture source
• IICRC Standards — ANSI-accredited, consensus-based standards
• ANSI/IICRC S520 Standard for Professional Mold Remediation — scope of the S520 standard; fourth edition 2024
• IICRC Applied Microbial Remediation Technician (AMRT) — what the AMRT certification covers
• About ACAC — board-awarded certifications; no training sales; CESB accreditation
• ACAC Microbial Remediation certifications — CMR and CMRS requirements
• ACAC Microbial Consulting certifications — what a CMI does
• FTC: How To Avoid a Home Improvement Scam — scam warning signs; checking complaints; contract contents; payment advice
• CDC: About Mold and Health — mold health effects as CDC states them
• Restoration & Remediation Magazine: A Buyer’s Guide for Mold/Bacteria Job Site Insurance — general liability mold exclusion; contractors environmental liability fills the gap

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