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Mold Remediation Cost: What to Expect

The size of the moldy area and where it is in the house set most of the price. Here is what the national cost data shows, and what to ask before you sign.

Updated November 2026 · 5 min read

Quick answer

HomeAdvisor's cost data puts the average mold removal job at $2,369, with most jobs between $1,223 and $3,758, or $10 to $25 per square foot (HomeAdvisor). Mold in the heating and cooling system, inside walls, or throughout the house costs much more. Patches under about 10 square feet can usually be cleaned by the homeowner (EPA).

How much does mold remediation cost?

These are national figures. Local prices and the size of your problem will move the number.

What does it cost by area of the house?

Ranges from HomeAdvisor:

  • Bathroom: $500 to $1,000
  • Crawl space: $500 to $2,000
  • Basement: $500 to $3,000
  • Attic: $1,000 to $4,000
  • Heating and cooling system: $3,000 to $10,000
  • Inside a wall: $1,000 to $20,000
  • Whole house: $10,000 to $30,000

The wall range is wide because the price depends on how much drywall, insulation and framing is affected. See water-damaged drywall.

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What raises the price?

  • Size. The EPA's do-it-yourself line is about 10 square feet. Bigger areas, or a lot of water damage, call for professional methods (EPA).
  • Hidden mold. Mold on the back of drywall, under carpet pad, inside walls or in ductwork has to be opened up and removed (EPA).
  • The heating and cooling system. If it may be contaminated, the EPA says not to run it, because it could spread mold through the house (EPA).
  • Sewage or contaminated water. The EPA says to bring in a professional experienced with contaminated water (EPA).
  • Porous materials. Moldy ceiling tiles, carpet and similar materials may have to be thrown out and replaced (EPA).

Fixing the leak or moisture problem is a separate cost, and it has to happen first or the mold comes back (CDC).

Do you need to pay for a mold test?

Usually not before cleanup. The CDC does not recommend mold testing, and the EPA says sampling is usually unnecessary when mold is visible (CDC; EPA). If you do test, HomeAdvisor puts basic testing at $250 to $350, and more complete testing with lab analysis at $450 to $800 (HomeAdvisor).

Where testing can earn its cost is after the work. The EPA says surface sampling may help confirm an area was cleaned properly (EPA).

Can you do it yourself to save money?

For a small patch, yes. If the moldy area is under about 10 square feet, roughly 3 feet by 3 feet, the EPA says you can usually handle it yourself (EPA). HomeAdvisor puts gear and cleaners for a job that size at $50 to $300 (HomeAdvisor).

The EPA recommends gloves, goggles without vent holes and an N-95 respirator (EPA). See mold after water damage for the cleanup steps.

Does insurance pay for mold remediation?

Sometimes, in a limited way. Many homeowner policies offer limited mold coverage, but only when the mold results from a covered loss, such as a pipe that suddenly bursts (Washington Office of the Insurance Commissioner). Mold from a long, slow leak or ongoing humidity usually isn't in that category.

If the mold followed a covered water loss, tell your insurer early and keep photos and invoices. See does homeowners insurance cover water damage?

What should you ask before hiring?

The EPA says to make sure the contractor has experience cleaning up mold, to check references, and to ask them to follow EPA, ACGIH or IICRC guidelines (EPA).

  • What exactly will be removed, and what will be cleaned in place?
  • How will the work area be sealed off from the rest of the house?
  • Is fixing the moisture source included, or is that someone else?
  • Is rebuilding drywall and flooring in this price, or a separate estimate?
  • How will you show the job is finished?

Common questions

How much does mold remediation cost per square foot?

HomeAdvisor's cost data puts most mold removal jobs between $10 and $25 per square foot, with an average job of about $2,369.

Why is mold in the HVAC system so expensive?

HomeAdvisor puts it at $3,000 to $10,000. The EPA says not to run a system that may be contaminated, because it could spread mold through the house, so the system has to be cleaned before it's used again.

Is a mold test worth paying for?

Usually not before cleanup. The CDC does not recommend testing, and the EPA says sampling is usually unnecessary when mold is visible. Testing can help confirm an area was cleaned properly afterward.

Will homeowners insurance pay for mold removal?

Only in limited cases. Many policies offer limited mold coverage when the mold came from a covered loss, like a sudden pipe burst. Mold from long-term leaks or humidity usually isn't covered.

Related guides

Local water damage help

Each state page lists the towns we cover, with local shut-off and sewer numbers and flood notes.

Town pages that cover this problem, with local water and sewer numbers:

Sources:

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