Mold Remediation Cost (2026)

Last reviewed 2026-10-30

Professional mold remediation typically costs $1,200 to $3,750, about $2,300 on average, according to This Old House (updated March 2026, with cost data mostly from Angi). By area, it prices the work at $10–$25 per square foot. Fixr (updated August 2025) gives $1,500 to $9,000, with a national average of $3,500; the two guides use different data, so the figures are not a like-for-like comparison. Two of the biggest factors are how much area is affected and where it is. The smallest jobs start around $500, while whole-house work after a major flood costs $10,000–$30,000 in both guides.

Cost by size of the affected area

Affected area	This Old House (2026)	Fixr (2025)
50 sq ft	$500–$1,250	$500–$1,500
100 sq ft	$1,000–$2,500	$1,000–$3,000
150 sq ft	$1,500–$3,750	$1,500–$4,500
200 sq ft	$2,000–$5,000	$2,000–$6,000
500 sq ft	$5,000–$12,500	$5,000–$15,000
1,000 sq ft	$10,000–$25,000	$10,000–$30,000

This Old House prices remediation at $10–$25 per square foot and Fixr at $10–$30, which is why the columns drift apart as jobs grow. Small jobs tend to land at the high end of the per-foot range because of minimum labor fees, This Old House notes.

Cost by location in the home

Location	This Old House (2026)	Fixr (2025)
Bathroom	$500–$1,000	$500–$1,500
Crawl space	$500–$2,000	$500–$2,000
Basement	$500–$3,000	$1,500–$4,000
Attic	$1,000–$4,000	$1,500–$9,000
Walls	—	$1,000–$12,000
HVAC system and ducts	$3,000–$10,000	$3,000–$10,000
Whole house	$10,000–$30,000	$10,000–$30,000

Location matters because of access and what has to come out. This Old House says attic jobs cost more when mold is in or behind the insulation, and crawl space jobs when access is limited. Fixr calls wall jobs some of the most expensive, because moldy drywall and plaster are usually cut out and replaced. More detail: attic mold removal cost and crawl space mold removal cost.

What remediation includes

Remediation is more than cleaning visible mold. A professional crew handles:

Containment. The work area is sealed off with plastic sheeting so spores don’t spread to the rest of the house. The EPA’s remediation guide, written for schools and commercial buildings, generally recommends limited containment for about 10–100 square feet of mold and full containment with an airlock above that, under negative pressure, leaving the final choice to professional judgment.
HEPA cleanup. The EPA recommends HEPA vacuums for the final cleanup, after materials have been thoroughly dried.
Removing porous materials. The EPA says porous materials such as ceiling tiles and carpet “may have to be thrown away” if they become moldy, because the mold “may be difficult or impossible to remove completely.” Hard surfaces such as tile, sealed concrete or metal can usually be cleaned instead, This Old House notes.
Fixing the moisture source. The EPA’s warning: if you clean up the mold but don’t fix the water problem, “most likely, the mold problem will come back.” Fixr lists leak repair as a separate cost, about $150–$350 for a typical leak and $400–$2,500 for a roof leak.

Labor is the largest part of the bill, “often making up more than half” of the price according to This Old House; Fixr estimates about 60% labor and 40% materials.

Room sealed with plastic sheeting, an air scrubber venting out a window and a section of drywall cut out — Containment, air filtration and removing damaged materials can all be part of a remediation job.

What can add to the bill

This Old House lists costs often left out of the first quote:

repairs to drywall, flooring, framing or cabinets after removal, which may be priced separately;
specialized HVAC cleaning if mold is in the ducts or air handler;
temporary housing if part of the home can’t be used during the work;
disposal fees for moldy insulation, carpet or drywall in some areas;
optional third-party air testing after the job;
permits for demolition or HVAC access in some cities, and third-party inspections that some insurance policies require before covering a claim.

Fixr adds that an inspection billed separately costs $450–$800, though some companies include it when they also do the removal. Restoration after severe mold can reach $10,000–$20,000, and not every remediation company does it.

Does insurance help pay?

It depends on what caused the mold. The Insurance Information Institute says mold is generally treated as a maintenance issue that standard homeowners policies don’t cover, but when mold growth is “the direct result of a covered peril such as a burst pipe,” the cost of eliminating it may be covered. In Texas, the state Department of Insurance describes the same split: sudden and accidental water damage is usually covered, while gradual leaks and floods are not, and flood damage needs a separate flood policy. Check your policy and ask your insurer before work starts. More in Does homeowners insurance cover mold?

When to call a professional

Here is what the EPA’s guide for homeowners says:

More than about 10 square feet, or a lot of water damage. Under about 10 square feet (roughly a 3 ft by 3 ft patch), the EPA says that “in most cases, you can handle the job yourself.” For larger areas or a lot of water damage, it points to its professional guide, Mold Remediation in Schools and Commercial Buildings, and says a contractor you hire should have experience cleaning up mold.
Sewage or other contaminated water. The EPA says to “call in a professional” with experience in buildings damaged by contaminated water.
Suspected mold in the HVAC system. “Do not run the HVAC system if you know or suspect that it is contaminated with mold,” the EPA says; it could spread mold throughout the building.
Hidden mold, such as a moldy smell with no visible source. The EPA says to “consider hiring an experienced professional.”
Health concerns. The EPA advises consulting a health professional before starting cleanup. Talk to your doctor.

Our Mold Check asks the same questions.

How to compare remediation estimates

This Old House suggests at least three estimates and caution with bids much higher or lower than the rest. Then compare them line by line:

the square footage and the materials to be removed, room by room;
how the work area will be contained and how the rest of the house is protected;
who fixes the moisture source, and whether that is in the price;
whether an inspection and post-remediation testing are included;
whether repairs and restoration are included or left to another contractor;
licensing and insurance.

Licensing rules vary by state. Two state examples, not national rules:

New York. Under the state’s mold law (Labor Law Article 32; licensing required since January 1, 2016), if you hire someone for more than 10 square feet of mold, they must be licensed. An independent assessment defines the scope, the same individual may not do both the assessment and the remediation on one property, and contractors price the job from the assessor’s plan.
Texas. Under the state’s mold law (Occupations Code chapter 1958, with TDLR rules in Administrative Code chapter 78), one licensee may not do both mold assessment and mold remediation on the same project. In most instances, the state licensing agency says, areas of visible mold under 25 contiguous square feet can be cleaned by people who are not licensed.

Check your own state’s rules, and see mold inspection cost for what an independent assessment costs.

How serious is your mold? Take the Mold Check

Next step: get an on-site assessment from a licensed mold remediation professional.

Ask for a written scope that covers the moisture source, containment, removal, and how they will confirm the job is done.

Sources

Illustrations on this page are AI-generated to help you picture the situation. They are not photos of real homes, jobs or people.

Health and safety. Mold can affect health, especially for people with allergies, asthma, or weakened immune systems. This site does not give medical advice — for health concerns talk to a doctor. For mold removal, contact a licensed mold remediation professional (licensing rules vary by state).