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Mold Remediation Cost

Mold remediation costs $1,980 to $2,740 for a medium affected area, 10 to 100 square feet, before your ZIP code is applied. Published national data puts the average total project at $2,369, closely matching that medium tier, with small jobs running under $1,100 and extensive contamination running into five figures.

The short answer

Mold remediation cost by affected area

Residential, common mold, moisture source already fixed, before your ZIP code is applied.

Affected areaExampleCost
Small, under 10 sq fte.g. corner of a shower$780 to $1,080
Medium, 10 to 100 sq fte.g. a bathroom wall$1,980 to $2,740
Large, 100 to 300 sq fte.g. a basement$4,350 to $5,900
Extensive, 300+ sq ftMajor contamination$8,600 to $13,200
$2,369
Published national average total for mold remediation
$10 to $25/sq ft
Published professional remediation rate
Under 10 sq ft
The EPA's general threshold for a homeowner to handle it without a professional
+40%
Added for a commercial property versus a comparable residential job
Cost factors

What changes the price

Affected area
The single biggest driver, priced in tiers from a small shower corner up to extensive, multi-room contamination.
Mold type
Common surface mold and black mold, Stachybotrys, are priced similarly at the small scale, but black mold adds about 14% due to stricter containment and disposal requirements once a professional confirms it.
Whether the moisture source is fixed
Active, unresolved moisture adds about 15%, since containment has to work around an ongoing source rather than a dried-out one. Remediation without fixing the source is a temporary fix, mold will return.
Property type
Commercial jobs run about 40% more than residential, reflecting larger systems, compliance requirements, and typically larger affected areas.
Testing add-ons
Air quality testing and post-remediation clearance testing are priced separately, and clearance testing in particular is often required to confirm a job is actually complete.
Frequently asked

Questions people ask before booking

How much does mold remediation cost?

For a medium affected area, 10 to 100 square feet, cost runs $1,980 to $2,740. Published national data puts the average total remediation project at $2,369, closely in line with that medium tier.

Can I remove mold myself instead of hiring a professional?

The EPA suggests homeowners can often handle an area under about 10 square feet on their own. Beyond that, or if water damage is extensive, the HVAC system may be involved, or the water source was contaminated, professional remediation is the recommended path.

What is the IICRC S520 standard?

It is an ANSI-accredited industry reference for mold remediation, describing procedures like contamination condition categories, containment levels, and HEPA filtration requirements. It sets a procedural standard, not a price list.

Does black mold cost more to remediate than other types?

Somewhat, about 14% more once a professional confirms it is Stachybotrys specifically, due to stricter containment and disposal requirements. Most household mold does not require this distinction to remediate safely.

Why does fixing the moisture source matter for the price and the outcome?

Because remediation without addressing the moisture source is temporary. Active, unfixed moisture also adds about 15% to the remediation cost itself, since containment has to work around an ongoing source rather than a resolved one.

Is a follow-up test needed after remediation?

Often recommended. Post-remediation clearance testing, priced separately from the remediation itself, confirms mold spore counts have returned to a normal range and the job is actually complete, not just visually clean.

Always start with an in-person inspection rather than a phone estimate. Affected area is often larger than what is visible on the surface, and a real inspection is the only way to scope the job accurately before work begins.

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