Mold Remediation Cost: How to Estimate and Quote the Job

Mold remediation is priced by the size of the affected area, the containment and PPE level the job requires, and how much material has to be removed and rebuilt. The mold itself is cheap to kill; the demolition, containment, and reconstruction are where the cost sits.

What is the average mold remediation cost?

A contained single-room remediation typically runs $1,500 to $4,000. Whole-house or HVAC-system remediation runs $10,000 to $30,000 or more. Small, surface-only jobs — a closet, a section of drywall — can be $500 to $1,200.

How is remediation priced per square foot?

Expect $10 to $25 per square foot of affected surface for standard remediation including containment, HEPA filtration, removal of porous materials, antimicrobial treatment, and cleanup. Attic and crawl space remediation is often quoted per square foot of footprint at $2 to $6 because it is spray-and-remove rather than full containment.

What drives the price up?

• Containment level: a full negative-air containment with a decon chamber costs far more than a simple poly barrier
• Location: mold inside wall cavities, HVAC, or under subfloor means demolition
• Category of water involved: contaminated water raises PPE and disposal requirements
• Post-remediation clearance testing by a third party: $300–$700

What should you exclude from the remediation quote?

Fixing the moisture source — the roof leak, the plumbing, the grading — is a separate job, and so is the rebuild (drywall, paint, flooring, trim). Spell that out. A remediation estimate that appears to include reconstruction invites a dispute when the customer sees a second bill.

How do you protect yourself on the estimate?

Quote from what is visible and note that hidden mold behind removed materials may expand the scope. Use an allowance or a unit price for additional affected square footage discovered during demolition, so scope growth is priced in advance rather than argued about mid-job.