How expensive is it to remove black mold from a house?

The cost to remove black mold from a house depends on the size of the affected area, the severity of the growth, and the location. Small areas such as a bathroom corner or basement spot may cost a few hundred dollars to treat, while larger infestations behind walls, under floors, or in HVAC systems can reach several thousand dollars. The national average for professional mold removal usually falls between $800 and $7,000. Costs may rise if structural repairs, drywall replacement, or deep cleaning are required to prevent regrowth and restore safe indoor conditions.