The answer to 'deck installation cost in Illinois' is that the cost can vary widely depending on several factors, but typically ranges from around $15 to $35 per square foot. The total cost for a deck installation project will depend on the size of the deck, the materials used, the complexity of the design, and the location of the home.
Factors that can influence the cost include the type of wood or composite material, the size and layout of the deck, any additional features like stairs or railings, and the labor costs in your local area. It's important to get multiple quotes from licensed and insured deck installation professionals in your local Illinois community to get an accurate estimate for your specific project.