Ant Extermination Average Costs
A one-time treatment by an exterminator might cost $150 to $1,000 depending on the type of ant (carpenter ant treatments tend to be more expensive), the property size, the severity of the problem, and the methods used. A one-time treatment may come with a guarantee (that is, the company will retreat the area if ants reemerge).
Quarterly, bi-monthly, or monthly services run $350 to $700 per year..