How this number is built
We start from a 2026 national baseline for roof replacement and apply a Illinois cost factor of 1.06, which reflects local labour, permitting and material costs. That puts Illinois 6% above the national average — ranked #39 of 51 from cheapest to most expensive.
That's about $5.04–$7.16 per square foot of roof area including tear-off and permits. Roof size drives the total more than anything else — which is why we measure your actual roof from satellite data rather than guessing from house size.
What moves the price
- Roof square footage and number of planes
- Pitch — steeper roofs cost more to work on
- Material: architectural shingle vs metal vs tile
- Layers to tear off, and any decking repair
Get a figure modeled for your actual home
This page is a Illinois average. Enter your address and we'll model roof replacement for your specific property — including your real roof area, measured from satellite data, and render it on the satellite image of your home. Free, no account.
See my home →Roofers by city in Illinois
Other Illinois costs
Modeled estimate, not a quote. Figures come from 2026 national baselines adjusted for Illinois; your installer sets the real price after seeing the property.