The answer to 'roof vent installation cost in Illinois' is that the cost can vary significantly depending on several factors. Roof vent installation typically ranges from $300 to $800 on average, but the actual cost will depend on the size and type of vent, the complexity of the installation, and your location within Illinois.
Factors that can influence the cost include the material and design of the vent, the roof type and pitch, the accessibility of the installation site, and whether any additional roofing work is required. It's essential to get local quotes from licensed and experienced roofing contractors to get an accurate estimate for your specific project.