*Prices shown are estimates for the Washington DC, Maryland, and Virginia area. Mold remediation costs depend heavily on lab testing results, the extent of hidden growth, and required reconstruction. An on-site assessment is required for an accurate quote.
Our free mold remediation cost calculator estimates your project from the affected area, its location, and severity. Professional remediation typically runs $15–$30 per square foot — we estimate at $20 — so a 100 sq ft basement problem lands around $2,000–$2,500 once location and severity multipliers apply. Whole-house or HVAC contamination is substantially more.
Mold is a moisture problem before it’s a mold problem. Remediation that doesn’t fix the water source fails — which is why moisture repair, containment, and post-remediation air testing are standard parts of a professional job in the Washington DC, Maryland, and Virginia area.
| Scenario | Typical Cost |
|---|---|
| Small bathroom patch (25 sq ft) | $500–$900 |
| Basement wall (100 sq ft) | $2,000–$3,200 |
| Attic or crawl space (200 sq ft) | $5,000–$9,400 |
| HVAC / whole-house contamination | $10,000+ |
| Air quality testing (before & after) | +$400 |
| Containment & negative air | +$500 |
| Demolition & rebuild | +$1,500 |
| Moisture source repair | +$600 |
Remediation is the professional process of containing, removing, and preventing mold: sealing off the area, removing contaminated materials, HEPA-cleaning the air, treating surfaces, and fixing the moisture source. It goes beyond “mold removal,” which only addresses visible growth.
Between $15 and $30 per square foot of affected area for most jobs. A typical residential project runs $2,000–$6,000; severe black mold in hard-to-reach areas costs more. Use the calculator above for a scenario-specific estimate.
Small jobs finish in a day; typical projects take 1–3 days, and large jobs with demolition and rebuild run up to a week. Air quality retesting adds a day or two before final clearance.
Only when the mold results from a sudden, covered water event — like a burst pipe. Mold from long-term humidity, slow leaks, or flooding (without flood insurance) is typically excluded, and many policies cap mold coverage at $1,000–$10,000.
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