Attic Conversion Cost in Illinois (2026)
Average cost in Illinois: $30,800(range: $11,000 – $71,500)
Browse exact estimates for all 7 cities in Illinois — updated for 2026.
State average
$30,800
Range
$11,000 – $71,500
Most expensive city
Chicago
$37,800 avg
Most affordable city
Springfield
$26,000 avg
Attic Conversion Cost in Illinois Cities
Click any city for a detailed estimate with interactive calculator
Chicago
Higher cost$37,800
from $13,500 · pop. 2,696,555
Aurora
Avg cost$29,400
from $10,500 · pop. 180,542
Joliet
Avg cost$29,400
from $10,500 · pop. 150,362
Naperville
Avg cost$30,800
from $11,000 · pop. 148,449
Rockford
Avg cost$26,600
from $9,500 · pop. 148,278
Springfield
Avg cost$26,000
from $9,300 · pop. 114,394
Peoria
Avg cost$26,600
from $9,500 · pop. 111,388
More Renovation Calculators for Illinois
Bathroom Remodel
avg $12,700 in IL
Kitchen Remodel
avg $28,600 in IL
Flooring Installation
avg $0 in IL
Interior Painting
avg $0 in IL
Electrical Wiring
avg $5,000 in IL
Plumbing
avg $3,900 in IL
Roof Replacement
avg $11,000 in IL
Full Home Renovation
avg $100 in IL
Bedroom Remodel
avg $7,200 in IL
Living Room Remodel
avg $10,500 in IL
Dining Room Remodel
avg $6,600 in IL
Kids Room Remodel
avg $5,500 in IL
Home Office Remodel
avg $8,300 in IL
Basement Finishing
avg $100 in IL
Garage Conversion
avg $19,800 in IL
Entryway Remodel
avg $3,900 in IL
Closet Installation
avg $3,300 in IL