The answer to 'flat roof installation cost in Illinois' is that the cost can vary significantly depending on several factors. Typically, the cost for a new flat roof installation in Illinois can range from $10 to $25 per square foot, with the average being around $15 to $20 per square foot.
The key factors that influence the cost include the size and complexity of the roof, the type of roofing material used (e.g., EPDM, TPO, or PVC), the accessibility and condition of the existing roof, and the labor costs in your local area. Additionally, the need for any structural repairs or modifications to the roof deck can also impact the overall cost.