The answer to 'wasp extermination cost in Illinois' is that the cost can vary widely depending on several factors. Typically, professional wasp removal services in Illinois range from $100 to $500 or more. The exact price will depend on the severity of the infestation, the location and accessibility of the nest, the type of treatment required, and the experience level of the pest control technician.
For smaller infestations, DIY wasp traps or sprays may be an option, but for larger nests or difficult-to-reach areas, it's generally best to call in a professional exterminator. They have the proper equipment and expertise to safely and effectively eliminate the wasp problem.