Mold remediation costs can vary depending on the extent, size, location, and specific parameters of the Mold problem. An interior mold problem depends largely on the total area of the mold problem and the type of material supporting mold growth. For instance, drywall may have to be removed when moldy, whereas concrete or plaster can be effectively treated. A large portion of the mold remediation cost is due to securing a negative air pressure ‘bubble’ around the mold contamination, which prevents mold from spreading.