Insulation Cost in Illinois
Updated for 2025 • Climate Zone 5A • Labor costs 10% above national average
Low
$1
Average
$3
High
$6
per sq ft • 10% above national average
Insulation in Illinois: What You Need to Know
Illinois falls in Climate Zone 5A (Cool-Humid), which maximum insulation pays dividends in heating-dominated climate. Understanding these local factors helps you make better decisions about materials and timing.
High R-Values
R-60 attic, R-20+ walls. Exceeding code minimums has fast payback.
Air Sealing Priority
Stack effect pulls warm air out. Attic air sealing critical.
Vapor Control
Interior vapor retarder prevents moisture in wall cavity.
✓ Recommended for Illinois
- • R-60 Attic
- • Dense Pack Walls
- • Air Sealing First
✗ Not Recommended
- • Code-Minimum Only
- • Skipping Air Sealing
Best time for this project in Illinois: Year-round
Calculate Your Insulation Cost in Illinois
Estimate Your Insulation Cost
Your Estimated Cost
Low
$880
Average
$2,200
High
$4,400
Slightly above national average
Budget-friendly option
Estimates are for planning purposes. Actual costs vary by project specifics, contractor, and market conditions.