Use the calculator below to get a realistic planning range for a roof replacement in Illinois and the surrounding Midwest. It runs entirely in your browser on this page: nothing you enter is sent to us, saved, or shared with anyone.
This is a planning estimate produced on this page from the numbers you entered — it is not a quote, and nothing you type here is sent anywhere or stored. Real pricing depends on decking condition, ventilation, flashing, code upgrades and what your inspection finds. If your roof was damaged by a storm, the figure that actually matters is your deductible, not the total: see how storm work is paid for.
Roofing is priced by the square — 100 square feet of finished roof surface. The calculator starts from the ground footprint you enter, multiplies it by a pitch factor to turn flat area into actual sloped roof area, adds a 10% waste allowance for cuts, starters and ridge, and then applies a per-square installed price range for the material you chose. Tear-off of existing layers, extra storeys and roof complexity are added on top, because all three change the labour, not the materials.
Treat the number as a budgeting range, not a price. The only figure you can rely on comes from someone standing on the roof.
The total replacement cost is usually not what you pay. On a covered hail or wind claim your carrier pays the replacement cost and your out-of-pocket is your deductible. How storm damage work gets paid for explains the two-payment process, recoverable depreciation, and why a contractor who offers to cover your deductible is a warning sign.
If you are paying for the roof yourself, you can compare monthly payment options for the amount the calculator gave you through our financing partner.
Financing is provided by third-party lenders through Hearth. Storm Restoration Services does not lend and is not a party to your loan.
A free storm damage inspection gives you a real number, plus documentation you can use if you decide to file a claim. Request an inspection, or read about the warranties that come with a new roof before you commit to anyone.