Illinois code & environmental drivers
- Adopted code basis: 2017 NEC — older adoption cycle, local amendments common
- State amendments: Illinois has no statewide electrical code — Chicago operates on its own Chicago Electrical Code (rigid metallic conduit mandatory, no NM cable), Cook County on 2017 NEC, downstate municipalities adopt independently
- Service entrance minimum: 200A for new residential construction
- Lightning flash density: Moderate — typical interior continental flash density
- Buried-conduit frost depth: 30-inch+ design depth — buried service conduit must clear hard frost line
Illinois licensing & permits
- License status: No statewide license — municipal credentials only
- License board: No statewide license — Chicago Department of Buildings, Cook County, and downstate municipalities issue local credentials (official site)
- Permit: Chicago and Cook County electrical permits required; rigid metallic conduit on all branch circuits within Chicago city limits
How electrical and panel upgrade costs vary in Illinois
State-specific code or insurance rule: Chicago is the only major U.S. city where romex (NM-B nonmetallic-sheathed cable) is prohibited on every residential branch circuit under the Chicago Electrical Code §18-27 — every conductor in a Chicago dwelling must be installed in EMT, IMC, or rigid metal conduit, dramatically raising labor cost on rewires versus suburban Cook County NEC-compliant work, and Chicago electricians additionally hold a Chicago Supervising Electrician license rather than a state credential.
Cities in Illinois
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