Basement Finishing Cost in Illinois
Updated for 2025 • Climate Zone 5A • Labor costs 10% above national average
Low
$28
Average
$55
High
$88
per sq ft • 10% above national average
Basement Finishing in Illinois: What You Need to Know
Illinois falls in Climate Zone 5A (Cool-Humid), which insulation and moisture control for comfort and energy savings. Understanding these local factors helps you make better decisions about materials and timing.
Heat Loss
Uninsulated basement can account for 20%+ of heat loss. Insulation essential.
Moisture
Cold foundation + warm air = condensation. Vapor management critical.
Egress Code
Bedrooms require egress windows meeting specific size requirements.
✓ Recommended for Illinois
- • Rigid Foam Against Foundation
- • Interior Drainage
- • Dehumidifier
✗ Not Recommended
- • Fiberglass Against Foundation
- • Finishing Over Moisture Issues
Best time for this project in Illinois: Year-round (indoor project)
Calculate Your Basement Finishing Cost in Illinois
Estimate Your Basement Finishing Cost
Your Estimated Cost
Low
$11,000
Average
$22,000
High
$35,200
Slightly above national average
Budget-friendly option
Estimates are for planning purposes. Actual costs vary by project specifics, contractor, and market conditions.