The answer to 'spider extermination cost in Illinois' is that the cost can vary widely depending on several factors. Typically, professional spider extermination services in Illinois range from around $100 to $500 or more, depending on the size of the infestation, the type of spiders, the location and accessibility of the home, and the specific treatment methods required.
Factors that can influence the cost include the number of rooms or areas that need to be treated, whether the spiders are located in hard-to-reach areas, and the complexity of the treatment plan. Larger infestations or those requiring more intensive methods like fumigation will generally cost more than smaller, easier-to-treat cases. It's important to get quotes from multiple local pest control companies to compare prices and services.