The cost of getting a professional ant exterminator Washington to get rid of your ant problems may depend greatly on the species of ant to be eliminated, the location, method to be used, and the size of the ant colony. Some DIY remedies can be used to remove ants. They’re very affordable and are estimated to cost around $10 to $15 only. This solution often makes use of some standard home essentials like soap and window cleaning agents. However, the results may not be as satisfying as compared to professional Washington ant exterminator services. A professional Washington ant exterminator service that utilizes the bait insecticide method can cost around $50 to $400 for the first treatment and may depend on the size of your house. If follow-up visitation or monthly application is needed, expect to pay around $20 to $70 more per visit. Quarterly visits are estimated to cost between $30 up to $120. In total, a one-year treatment from a professional ant exterminator Washington can cost around $300 to $800.