If mold infestation is severe and you are mold-sensitive, you may have to live elsewhere during cleanup. Remediation costs vary depending on how much and where mold exists. $500 to $4,000 to remove mold from crawlspaces only. $2,000 to $6,000 to remove mold from ducts, crawl spaces, walls, and attics. $10,000 to $30,000 (or more) to repair widespread structural damage.