Chicago Home Addition Permits 2026

Chicago home addition permit fees, plan review, and required inspections for 2026.

Chicago Home Addition permit basics

  • Building department: City of Chicago Department of Buildings
  • Department URL: https://www.chicago.gov/city/en/depts/bldgs.html
  • Permit fee typical: $400 - $3,500 permit fee
  • Plan review + approval: 7-21 business days
  • Inspections required: 6-12 inspections (footing, framing, electrical, plumbing, mechanical, insulation, drywall, final)

Chicago Home Addition common issues

Setback compliance, FAR (floor-area ratio), structural review required, sewer/water capacity may need upgrade.

Chicago-specific permitting context

Chicago requires licensed Self-Certifying Professional (architect/engineer) for many alterations. Plumbing requires Chicago-specific master plumber license separate from Illinois state license.

Climate factors: Severe winters with deep frost lines (42 inch) for foundations; lake-effect snow; freeze-thaw cycles harsh on masonry

Illinois licensing for Home Addition contractors

Illinois Department of Financial and Professional Regulation (IDFPR) - required: Varies by trade (plumbing $300, roofing $125). Board: https://www.idfpr.illinois.gov.

Mechanics lien deadline in Illinois: 4 months from last work (residential); 2 years to file suit. Preliminary notice: 60-day notice required from subcontractors on owner-occupied residential.

Chicago Home Addition sales tax

Illinois sales tax: 6.25% + local (~8.8% combined avg). Contractor pays Use Tax on materials. Real property labor exempt. Sale of TPP to customer is taxable retail sale.

Verify with the Illinois Department of Revenue.

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