Enter the size of the moldy area in square feet, pick where it is and how severe it looks, and add any extras such as testing or drywall replacement. The calculator returns a price range based on published 2026 cost-guide data, not a quote.
The base rate matches our mold remediation cost guide: most professionals charge about $10–$25 per sq. ft., and most homeowners pay $1,200–$3,750 in total. For location-specific detail, see our guides to attic mold remediation and crawl space mold remediation.
Calculator
Typical results
For reference, these are typical remediation totals reported in 2026:
| Scenario | Typical range | Notes |
|---|---|---|
| Small job, under 100 sq. ft. | $500–$1,500 | Bathroom or a single wall section |
| Typical job, 100–150 sq. ft. | $1,200–$3,750 | Most homeowners' range |
| Large job, 500 sq. ft. | $5,000–$12,500 | Whole basement or attic area |
| Whole house | $10,000–$30,000 | Usually after flooding |
What goes into the estimate
- Affected area in square feet. Most companies price remediation by the square foot of affected surface, typically $10–$25 per sq. ft. Small jobs hit a minimum charge, which the calculator sets at $500–$1,000 (the typical range for a small bathroom job).
- Location in the home. Open areas like bathrooms and basements are the easiest to work in. Attics and crawl spaces take longer because of tight access, and mold inside walls or ceilings requires opening and disposing of drywall.
- Severity. Light surface mold on non-porous materials mostly needs cleaning. Heavy growth that has soaked into porous materials means more removal, bagging and disposal, which raises labor.
- Containment and air filtration. Bigger jobs need plastic containment, negative air pressure and HEPA air scrubbers. Basic containment is assumed in the rate; extra air scrubbing and HEPA vacuuming adds about $500–$1,000.
- Materials to replace. Remediation removes damaged materials but rebuilding is usually billed separately. Add drywall ($1,000–$2,900) or carpet ($775–$2,600) replacement if they will need to be redone.
How we built the ranges
Base prices come from published 2026 data: the $10–$25 per sq. ft. rate, HVAC and whole-house ranges, testing and repair costs from Angi (updated July 2026) and HomeAdvisor (updated June 2026), cross-checked with This Old House (March 2026), HomeGuide (February 2026) and Fixr (air scrubbers, leak repair). The location and severity multipliers are WhatHomeCosts estimates that reflect the extra labor of tight spaces, demolition and heavy contamination.
The calculator does not include fixing major moisture sources (roof replacement, basement waterproofing, crawl space encapsulation), full rebuilds after flooding, temporary housing or replacing belongings. Actual quotes depend on an on-site inspection; mold hidden in walls or ducts can change the scope.
FAQ
Can I remove small areas of mold myself?
The EPA says areas smaller than about 10 sq. ft. are generally manageable for a homeowner. Larger areas, mold in the HVAC system, or mold after sewage or contaminated water should be handled by professionals.
Is the calculator result a quote?
No. It's a rough range to help you budget and check whether quotes are reasonable. Get at least three written quotes based on an on-site inspection.
Does black mold cost more to remove?
Sometimes, because some companies use stricter containment and protective gear. Fixr reports $800–$7,000 for black mold jobs, but area and location still drive most of the price.
This tool gives a rough estimate only. Get at least three written quotes for your project.
For a full breakdown of prices, read our complete mold remediation cost guide.
Sources
- Angi — How Much Does Mold Remediation Cost? [2026 Data] (updated Jul 9, 2026). Checked October 8, 2026.
- HomeAdvisor — How Much Does Mold Remediation Cost in 2026? (updated Jun 19, 2026). Checked October 8, 2026.
- This Old House — How Much Does Mold Remediation Cost? (2026 Guide) (updated Mar 11, 2026). Checked October 8, 2026.
- Fixr — Mold Remediation Cost (updated Aug 29, 2025). Checked October 8, 2026.
- US EPA — Mold Cleanup in Your Home (updated Jun 4, 2026). Checked October 8, 2026.
Prices are estimates and vary by location and provider. See our methodology and editorial policy. Browse all tools & calculators cost guides.