Mold Remediation Area Calculator

Mold remediation scope depends on the total affected area, the type of materials involved,
and whether the contamination is visible or concealed. This calculator follows EPA and IICRC
S520 guidelines for remediation levels and containment requirements.

Calculate Remediation Scope

Visible Mold Area

sq ft

Surface Type

Non-porous (tile, metal, glass)
Semi-porous (wood, concrete)
Porous (drywall, carpet, insulation)

Concealed Contamination?

No — all mold is visible
Suspected — musty odor, staining
Confirmed — behind walls/ceiling

HVAC Contamination?

No
Suspected (near return vent)
Yes — visible in ducts

Calculate Scope

Remediation Level

This is not a substitute for professional mold assessment. A certified
mold inspector should verify contamination scope before remediation begins. Costs are
regional averages and vary significantly by market.

EPA Remediation Levels

The EPA defines three remediation levels based on total contaminated area. Each level has
different containment, PPE, and professional requirements.

Level	Area	Containment	Who Can Perform
Level 1	< 10 sq ft	Minimal — work area isolation	Building maintenance staff with training
Level 2	10 – 100 sq ft	Limited — polyethylene sheeting, HEPA vacuum	Trained remediation personnel
Level 3	> 100 sq ft	Full — negative air pressure, decontamination chamber	Licensed mold remediation contractor

Frequently Asked Questions

How much does mold remediation cost?

Costs vary widely by region and scope. Small projects (under 10 sq ft) may cost $500–$1,500.
Mid-size remediation (10–100 sq ft) typically runs $2,000–$6,000. Large-scale projects
(over 100 sq ft or involving HVAC) can range from $5,000 to $30,000 or more. These figures include
containment, removal, disposal, and clearance testing.

Does mold remediation include fixing the water source?

No. Mold remediation addresses the contamination. The underlying moisture source (leaking roof,
plumbing, poor ventilation) must be fixed separately, either before or concurrent with remediation.
Without fixing the source, mold will return.

Is post-remediation testing required?

Most states do not legally require it, but it is standard practice for Level 2 and Level 3
remediation. A third-party inspector (not the remediation company) should perform clearance testing
to verify mold counts have returned to normal levels.

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