The answer to 'spider extermination cost' is that the cost can vary widely depending on several factors. Generally, professional spider extermination services range from around $100 to $500 or more, depending on the size of the infestation, the type of spiders, the accessibility of the infested areas, and your location.
Factors that can influence the cost include the number of rooms or square footage that needs to be treated, the complexity of the treatment required, and whether it's a one-time service or an ongoing maintenance plan. The type of spiders present may also affect the cost, as some species require more specialized treatment. Additionally, your location and the going rates for pest control services in your area will play a role in the final price.