An ant exterminator costs $200 to $300 for a one-time visit, depending on the size of your home, the location and size of the infestation, the type of ants you have, and the treatment required to completely eliminate the colony. Mild infestations in easy-to-treat areas like a backyard are less expensive while larger infestations and harder-to-reach areas like attics and crawlspaces are more costly to treat.
Ants tend to return to their food source, so repeat treatments are common. Most pest control companies reward repeat business by offering discounted rates for monthly, quarterly, or annual contracts. You will save money and avoid the risk of a large invasion by having routine inspections and treatments as needed.