Find a Verified Mold Removal & Remediation Company

How to choose a mold removal company

Most homeowners hire the first contractor who picks up the phone. That's how the wrong company gets the job. Here's what to check before you sign anything.

A real state license. State rules for mold work vary. Florida, Texas, New York, Louisiana and Washington DC issue licenses specifically for mold work. A few other states cover it another way, such as Connecticut's home improvement registration, Tennessee's Mold Remediation (S-F) contractor classification, Mississippi's commercial Hazardous Materials classification and Virginia's certification requirement for residential mold remediation. Most states issue no mold license, so there, ask for insurance and certifications instead. If a company says "we don't need a license in this state," that might be true; it also means they have no licensing board to complain to if the job goes sideways. Where we hold the state's license records, we check the license against them.

Active general liability and pollution insurance. Pollution coverage is the specific policy that covers mold work. Standard contractor insurance often doesn't include it. Ask for a certificate of insurance (COI) with both. If they balk, walk.

IICRC S-520 training or equivalent. The IICRC publishes the technical standard for mold remediation (S-520). A certified firm has at least one technician trained to S-520. Not every job needs a fully IICRC-certified firm. Every job benefits from one.

Independence from the inspector. This is the rule most people miss. The company that tests your mold should not be the same company that removes it. Florida, Texas, Louisiana, New York and Oklahoma each limit it by law in different ways, and in any state you can hire two companies. Same-company assessment-and-remediation creates a conflict of interest where they're motivated to find more mold than exists. If you need one, find a verified mold inspection company.

A written scope of work before payment. Not a verbal quote. A signed document that specifies the affected area, the protocol, the containment plan, and what "complete" looks like. If they won't put it in writing, they're not the company you want.

How much does mold removal cost?

Nationally, a typical mold remediation job costs $1,223 to $3,757, with an average of $2,368, from 7,947 project costs reported to HomeAdvisor. Small isolated spots come in lower: pros quote $592 to $1,188 for a small patch on Thumbtack. Whole-house jobs run $10,000 to $30,000 or more, a range HomeAdvisor prints without saying how it measured. The range is wide because the work is variable.

What drives the price:

Affected square footage. The number that matters most. HomeAdvisor prints $10 to $25 per square foot without saying how it measured it, and small jobs cost more per foot because containment and disposal do not shrink with them.

Where the mold is. Behind drywall is more work than a surface area on a basement wall. Inside HVAC ductwork is more work than behind drywall. Crawl spaces and attics often need encapsulation in addition to removal.

Whether the source is still active. If there's still a leak feeding the mold, fixing the leak is part of the job. Plumbing or roofing work adds cost but isn't optional. Skip the source fix and the mold comes back in months.

The type of mold. Most household mold is ordinary. A few species (like Stachybotrys, the actual "black mold") require a more careful protocol because the spores are more harmful when disturbed. The protocol costs more.

Containment level. Level 1 (small, isolated) is cheaper than Level 4 (whole-room or whole-floor). The bigger the containment, the more plastic, negative-air machines, and labor.

Good news: a written scope makes the price predictable. Bad news: most contractors don't volunteer a written scope. You have to ask.

If three quotes come in thousands of dollars apart, the wildly different prices aren't necessarily a sign of dishonesty. They're a sign that the contractors are quoting different scopes. The scope is the contract. Get a written scope from each before comparing prices. For more detail, see what remediation typically costs, and where each figure comes from.

The mold remediation process: what to expect

A real mold remediation job has seven steps. Some contractors skip steps to save money. Don't hire those contractors.

Does homeowners insurance cover mold remediation?

Sometimes. The honest answer is more nuanced than yes or no.

When insurance usually covers it: mold caused by a sudden, accidental water event. A burst pipe, a roof leak from a storm, an overflowing dishwasher. The water damage triggers coverage; the resulting mold is often included up to a policy cap, so check the mold limit on yours.

When insurance usually doesn't cover it: mold caused by long-term moisture, neglect, or maintenance issues. A slow leak you ignored. Condensation from poor ventilation. Flooding from rising water (which usually needs separate flood insurance).

What helps your claim:

• Photos of the original water source, taken before cleanup
• Receipts for any emergency mitigation (dry-out service)
• A written protocol from a licensed mold assessor (not a verbal quote)
• Filing within the timeframe specified in your policy (often 72 hours from discovery)

A licensed mold assessor's protocol is what insurance adjusters trust. A contractor's quote without the protocol is harder to substantiate. This is another reason for separate assessment and removal: the assessor's report is independent of the contractor doing the work, which makes the documentation more credible to the insurance company. Find a verified, independent mold inspection company near you to handle the assessment side of your claim.

Mold removal services we cover

Verified providers on the site handle the full range of mold removal and mold remediation services. Most jobs fall into one of these categories.

Attic mold removal services

Attics are mold magnets. Roof leaks, poor ventilation, and the temperature swings between heated living space below and cold attic air create exactly the condensation conditions mold needs. Attic jobs often involve not just remediation but ventilation repair and sometimes new sheathing.

Basement mold removal services

Basements stay damp because they're below grade and below average HVAC reach. Basement mold remediation almost always pairs with dehumidification and sometimes interior waterproofing. Basement mold removal cost typically runs higher than other rooms because of the combined work.

Crawl space mold remediation

Crawl spaces are the most-missed source of household mold. The signs show up upstairs (musty smell in floor vents, allergy symptoms with no visible cause) but the work happens in a 3-foot tall dirt space few homeowners ever enter. Encapsulation is usually part of the job.

Black mold removal services

Black mold (Stachybotrys chartarum) is the species most homeowners worry about. The remediation protocol is the same as other species but the containment level steps up and the disturbance threshold drops. Don't poke it. Have it tested first.

Emergency mold response

A 24/7 line matters. Mold doubles in 24-48 hours under the right conditions. Ask a company whether it answers overnight before you count on it.

Residential mold removal: what homeowners should know

Most residential mold problems show up in the same few places. Basements, bathrooms, attics, crawl spaces, and behind kitchen cabinets near the dishwasher or sink. The pattern is consistent because mold needs moisture, and those are the moist places. The corner of the closet you never open is another one.

The decision threshold for a homeowner: if the affected area is less than 10 square feet and you can identify and fix the moisture source, you may be able to do it yourself. Anything larger or unclear should go to a professional. The 10-square-foot threshold comes from EPA residential guidance and is the most-cited line in the industry. See the DIY vs professional decision threshold for the full breakdown.

The signs you should call a pro now, not later:

• Visible black or dark green mold larger than a dinner plate
• A musty smell with no visible source (often means mold inside walls)
• Anyone in the household has respiratory issues, asthma, or compromised immune function
• Mold returning after you cleaned it yourself
• Water damage from flooding or a long-term leak

Browse by state below or search your city to find a mold remediation company near you.

Commercial mold remediation: solutions for business owners

Commercial mold work is a different job from residential, even when the mold itself is the same. The stakes shift. Tenant safety. OSHA compliance. Business continuity. Lease obligations. Insurance coverage that may differ from a homeowner's policy. The remediation protocol is the same, but the surrounding work is heavier.

What's different for commercial:

• Tenant or employee notification often required by lease or state law
• After-hours scheduling to avoid business disruption
• Documentation for insurance, regulatory bodies, and potential litigation
• Coordination with property management, HVAC contractors, and sometimes industrial hygienists
• HVAC-specific remediation when contamination has entered the ductwork

Some companies list commercial work on their profile. Look for the "Commercial" tag or contact the company directly to confirm its commercial experience. Depending on the state and the size of the job, commercial work can also need a state contractor license, and in Mississippi the contractor board's commercial Hazardous Materials classification includes mold remediation. Ask which license the job needs and which certifications, such as IICRC, the company holds.

Why choose a verified mold removal company

Most contractor-matching services sell your contact info to anyone who pays. The model is different from HomeAdvisor or Angi. We don't sell your contact info, so no company pays us for the chance to cold-call you.

What we check, and where:

• Identity. Every listing is identity-checked.
• License, where we hold the state's records. In those states the license is matched to the state's records, and we check license expiration dates every day. In other states, most listings have no license record on file with us.
• Insurance, when a company supplies a certificate. We verify the certificate of insurance (COI). Tier A and Tier B require it.
• Google rating and review count. Shown as Google reports them, not submitted by the contractor.

The Trust Tier System ranks providers A, B, or C based on which checks they pass. Tier A (Clinical Grade) providers have verified insurance and a Google rating of 4.0 or higher from at least 5 reviews, and get top placement. Tier C (Verified Pro) listings have no verified insurance yet and are listed below them. A contractor can't pay to skip the check. That's the difference.