The cost of extermination various from ants the destroy structural wood in homes or commercial business building to ants the are just a nuisance. Exterminating carpenter ants will cost anywhere from $250 to $500. Removing fire ants will cost less, somewhere between $100 and $300. Other types of ants, like pharaoh and sugar ants, will cost between $200 and $250 to remove, while black or rover ants will cost around $150