The answer to the cost of a deck in Illinois is that there is a wide range, typically between $15,000 to $35,000 for a basic 12x16 foot deck. The final cost will depend on factors like the size and materials used, as well as your location within the state.
Decks made with pressure-treated wood will generally be on the lower end of the range, while composite or hardwood decks can cost significantly more. Additional features like built-in seating, lighting, or stairs will also increase the total price. Getting quotes from multiple local contractors is essential to understanding the costs in your specific area.