SmartInsulationCalculator

2026 cost data

Insulation Cost in Illinois (2026)

Insulation in Illinois costs above the national average — ranked 36 of 51 for installed price. Illinois sits in climate zone 5, so attics should hit R-60.

Insulation prices per square foot

Installed prices — material plus labor — adjusted for Illinois labor rates.

Job typeInstalled cost / sq ft1,500 sq ft attic
Attic blown-in fiberglass (R-49)$2.00$2,997
Attic blown-in cellulose (R-49)$1.84$2,754
Attic fiberglass batts (R-38)$1.73$2,592
Wall batts, open framing (R-15)$1.89$2,835
Wall dense-pack retrofit (drill & fill)$2.81$4,212
Crawlspace floor or wall insulation$2.27$3,402
Basement rigid foam + framing$3.35$5,022
Open-cell spray foam (3.5")$2.11$3,159
Closed-cell spray foam (2")$3.89$5,832
Old insulation removal & disposal$1.67$2,511

What whole jobs cost

Typical projectLocal price range
Attic top-up (1,500 sq ft)$1,620 – $2,808
Full attic removal + re-insulate$3,456 – $5,832
Whole-house wall retrofit (2,000 sq ft home)$4,536 – $8,424
Crawlspace encapsulation + insulation$4,104 – $9,720
Garage conversion insulation$972 – $2,376
Whole-home spray foam (new build)$8,100 – $17,280

Climate zone 5 R-value targets

Department of Energy retrofit recommendations for this zone.

Attic
R-60
Walls
R-20
Floors
R-30
Check your current R-value →

Price your own job

These tables are averages. Punch in your real measurements for a number you can compare against a bid.

Insulation costAtticBlown-in bagsProject total

Cities in Illinois

Chicago

Insulation cost FAQs for Illinois

How much does attic insulation cost in Illinois?

A 1,500 sq ft attic blown to R-49 runs about $2,547 to $3,596 installed in Illinois, or roughly $2.00 per square foot. DIY with rented equipment cuts that by 45–60%.

Is insulation cheaper to DIY in Illinois?

Yes. Labor is most of an insulation bid, so blowing your own attic or installing batts typically saves 45–60% of the installed price. Spray foam, dense-pack wall retrofits and removal jobs are worth hiring out.

What drives insulation prices in Illinois?

Local labor rates, how far crews travel, attic access, whether old insulation has to be removed first, and the R-value your climate zone calls for. Material prices barely change between states — labor is the swing factor.

Are there rebates in Illinois?

The federal 25C tax credit covers 30% of insulation and air-sealing material costs up to $1,200 per year, and most utilities add their own attic and air-sealing rebates. Always check with your utility before booking work.

Materials for an insulation job in Illinois

Fiberglass Insulation Rolls R13Browse current prices and top-rated options on Amazon

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