How much insulation do I need?

Measure the area and target the right R-value for your climate — R-38 to R-60 in attics, R-13 to R-21 in walls.

Is spray foam worth the extra cost?

Closed-cell foam costs more but delivers the highest R-value per inch and air-seals, which can cut energy bills the most.

How much does it cost to insulate a house?

It depends on area and type — from about $1/ft² for batts to $7/ft² for spray foam, installed.

Insulation Cost in Illinois

Local 2026 pricing for Illinois

Insulation costs in Illinois run roughly 5% above the national average. Illinois swings from hot summers to hard winters, so whole-home insulation with R-49 attics is typical; labor runs slightly above the national average.

Your measurements

Area length(ft)

Area width / wall height(ft)

Insulation type

Price per ft²($/ft²)

Enter your measurements

Fill in the fields to see your estimate.

Why Illinois prices differ

Illinois swings from hot summers to hard winters, so whole-home insulation with R-49 attics is typical; labor runs slightly above the national average.

Project size — larger insulation jobs lower the cost per unit but raise the total.
Material grade — premium products cost more but often last longer.
Labor rates — local wages and demand swing installed prices significantly.
Region — prices vary by state and metro (see local cost pages below).

Estimates are guidance only — get quotes from local insulation pros in Illinois. See the national cost breakdown →