Mold remediation costs $1,223 to $3,757 for most projects, or $15 to $30 per square foot of affected area.12 National averages run $2,368 to $3,500 (Angi, Fixr).13 Prices below are national averages* for 2026.
*National averages, not local quotes. Your price depends on where the mold is, how far it has spread, and what has to be rebuilt afterward. Testing adds $250 to $350, plus repairs to damaged drywall, carpet, or flooring (Angi).1
$2,368
average, Angi
$15 – $30
per sq ft, HomeGuide / Fixr
$500 – $1,000
bathroom job, Angi
$3,500
average attic job, Fixr
Quick math: a 100-sq-ft affected patch at $15 to $30 per square foot = $1,500 to $3,000, matching HomeGuide’s small-to-medium job bands, our arithmetic.2 Whole-house work lands at $10,000 to $30,000 across sources — the per-foot rate barely changes, so scope is everything, our reading.123
Cost by location (Angi)
| Location | Cost | Why it lands there |
|---|---|---|
| Bathroom | $500 – $1,000 | Small, contained, easy access |
| Crawl space | $500 – $2,000 | Tight access but limited area |
| Basement | $500 – $3,000 | Moisture-prone, varies with finishes |
| Attic | $1,000 – $4,000 | Access difficulty, insulation handling |
| HVAC system | $3,000 – $10,000 | Spores spread through ductwork |
| Wall cavities | $1,000 – $20,000 | Hidden spread drives demolition |
| Whole house | $10,000 – $30,000 | Multi-room containment and rebuild |
Location drives price more than square footage: the same patch costs little in an open bathroom and much more inside ductwork or wall cavities, our reading of the table.1
Cost by affected area (HomeGuide)
| Size | Area (sq ft) | Cost |
|---|---|---|
| Small | 10 – 100 | $500 – $1,500 |
| Medium | 100 – 300 | $1,500 – $6,000 |
| Large | 300 – 1,000 | $6,000 – $15,000 |
| Very large / whole home | 1,000+ | $15,000 – $30,000 |
The $15–$30 per-foot rate holds from small to very large jobs — there is no volume discount when every square foot needs containment and treatment, our reading.2
What the price includes
A proper remediation quote covers containment of the work area, HEPA air filtration, removal of unsalvageable porous material, treatment of salvageable surfaces, and disposal. Testing ($250–$350, Angi) and rebuilding removed drywall or flooring sit outside most base quotes, our synthesis.1
DIY vs pro
A small surface patch on non-porous material is a reasonable DIY clean. Call a pro when mold covers a larger area, sits inside walls or HVAC, follows contaminated water, or anyone in the home has respiratory sensitivity — disturbing a big colony without containment spreads it, our synthesis. Remediation is licensed and insured work in most states.
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All cost guides
Sources
1. Angi — How Much Does Mold Remediation Cost?
2. HomeGuide — Mold Removal Cost
3. Fixr — Mold Remediation Cost