Illinois Electrical Code & NEC Adoption
This guide covers everything you need to know about electrical code in Illinois, including the current NEC edition (2008), wire sizing requirements, GFCI rules, electrician licensing, permit costs, and city-specific regulations. Illinois scores 47/100 on WireRef's compliance scale, placing it in the permissive tier for code enforcement and safety oversight.
How Illinois scores on electrical code compliance
WireRef rates each state's electrical code environment on a 0-100 scale based on four factors: NEC edition recency, licensing requirements, permit enforcement, and active state amendments. Illinois scores 47/100, rated Permissive.
This score is for informational purposes only. A lower score does not mean electrical work in the state is unsafe - many local jurisdictions enforce strict standards independently of statewide policy.
Wire sizing requirements in Illinois
Regardless of the specific NEC edition enforced in your Illinois jurisdiction, the core ampacity values in Table 310.16 apply. The table below covers standard residential circuits:
| Circuit | Wire (Cu) | Breaker | Insulation |
|---|---|---|---|
| Kitchen 20A outlet Required for all kitchen receptacle circuits per NEC 210.11(C)(1) | 12 AWG | 20A | NM-B (Romex) |
| Bathroom 20A outlet Dedicated 20A circuit required per NEC 210.11(C)(3) | 12 AWG | 20A | NM-B (Romex) |
| General lighting 15A Standard for bedroom, living room, hallway lighting circuits | 14 AWG | 15A | NM-B (Romex) |
| Electric dryer 240V 10/3 NM-B for cable; 10 AWG THHN in conduit | 10 AWG | 30A | NM-B or THHN |
| Electric range 240V 6/3 NM-B for cable run; dedicated circuit required | 6 AWG | 50A | NM-B or THHN |
| EV charger (48A) 48A continuous load x 1.25 = 60A breaker minimum | 6 AWG | 60A | THHN in conduit |
| Central A/C (3-5 ton) Sized per unit nameplate MCA and MOCP values | 10-6 AWG | 30-50A | THHN |
| 200A dwelling service 2/0 copper or 4/0 aluminum per Table 310.15(B)(7) for dwelling services | 2/0 AWG | 200A | USE-2 or THHN |
For long wire runs in Illinois (over 50 feet), voltage drop becomes the limiting factor before ampacity. Use our voltage drop calculator to verify your wire size keeps voltage drop under 3% for branch circuits or 5% total (feeder + branch).
GFCI requirements in Illinois
GFCI requirements depend on the specific NEC edition enforced in your Illinois jurisdiction. Contact your local building department to confirm which requirements apply.
| Location | GFCI requirement |
|---|---|
| Kitchen | Contact your local building department. |
| Bathroom | All bathroom receptacles typically require GFCI. |
| Outdoor | Outdoor receptacles typically require GFCI. |
| Garage | Garage receptacles typically require GFCI. |
| Basement | Varies by edition. |
| Laundry | Varies by edition. |
See detailed GFCI rules by room: Kitchen · Bathroom · Garage · Outdoor · Basement · Laundry · Bedroom · Pool & Spa
Electrician licensing & permits in Illinois
Illinois requires electricians to be licensed. The primary license is the Electrical License (varies by jurisdiction), administered by the No statewide electrical licensing (local jurisdiction). Homeowners are generally exempt from licensing requirements when performing electrical work on their own primary residence - but permits and inspections are still required.
Permits: Electrical permits are required for most new circuits, panel upgrades, and service changes. Homeowners may pull permits for their own primary residence in most jurisdictions.
Typical permit costs: Residential electrical permits in Illinois generally range from $50-$400 depending on the scope of work and jurisdiction. Chicago has significantly higher permit costs than downstate municipalities.
Permit costs are approximate and vary by jurisdiction. Contact your local building department for exact fees. Costs shown are for residential electrical permits and may not reflect commercial rates.
Common electrical projects that require a permit in most Illinois jurisdictions:
- New circuits - adding any new branch circuit to the panel
- Panel upgrades - replacing or upsizing the main electrical panel
- Service changes - upgrading from 100A to 200A service
- EV charger installation - new 240V circuit for Level 2 charging
- Hot tub or pool wiring - Article 680 requirements apply
- Detached structure wiring - garage, shed, or ADU subpanel
Work that typically does not require a permit includes replacing switches, outlets, and light fixtures on existing circuits (no new wiring). However, rules vary - when in doubt, call your local Illinois building department before starting.
License types in Illinois
| License Type | Experience | Exam | Details |
|---|---|---|---|
| Local Journeyman/Master | See requirements | No | Requirements vary entirely by city/county. Chicago has its own licensing system. |
Homeowner exemption: Yes. Generally yes, but check local rules
Detailed permit costs by city
Chicago electrical permit fees
| Project Type | Estimated Cost |
|---|---|
| Service change/upgrade | $75–$200 |
| Panel upgrade | $75–$175 |
| EV charger installation | $75–$150 |
Major cities: building departments & local codes
While Illinois's statewide code provides the baseline, individual cities may have additional requirements, different permit fees, or local amendments. Below are the building department contacts for Illinois's largest cities.
| City | Building Department | Notes |
|---|---|---|
| Chicago | Dept. of Buildings | Chicago Electrical Code - NM-B (Romex) is prohibited citywide. All wiring must be in conduit.. Permits from ~$75-$200+ |
| Springfield | Building & Zoning | Follows state NEC adoption |
| Naperville | Building Services | Follows state NEC adoption |
City-specific information last verified Apr 2026. Contact the building department directly for current fees and requirements. WireRef is not affiliated with any municipal building department.
EV charger permit requirements in Illinois
Most jurisdictions in Illinois require an electrical permit for Level 2 EV charger installation. A Level 2 charger typically requires a dedicated 240V circuit with a 50A or 60A breaker and 6 AWG copper wire (for a 48A charger at continuous load).
Permit requirements vary by municipality. Chicago requires permits for all electrical work.
| Spec | Requirement |
|---|---|
| Typical circuit | 240V, 50A or 60A breaker, 6 AWG copper THHN |
| Permit required | Yes, in most jurisdictions |
| Continuous load rule | 48A charger x 1.25 = 60A breaker (NEC 210.20) |
| GFCI/disconnect | Disconnect within sight of charger per NEC 625. GFCI protection per NEC 625.54 (outdoor) or manufacturer requirements |
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See our complete EV charger wiring guide for detailed installation requirements. For state incentives and rebates, check the DSIRE database for Illinois-specific programs.
Frequently asked questions: Illinois electrical code
What NEC edition does Illinois currently use?
Illinois currently enforces NEC 2008. It became effective on July 01, 2011. This determines the baseline electrical safety requirements for all new electrical work in the state. Local jurisdictions may adopt more recent editions or add amendments.
Do I need an electrician license to do electrical work in Illinois?
Yes - Illinois requires a Electrical License (varies by jurisdiction) for professional electrical work through the No statewide electrical licensing (local jurisdiction). However, homeowners are generally exempt when working on their own primary residence.
Do I need a permit for electrical work in Illinois?
Yes - most electrical work in Illinois requires a permit, including new circuits, panel upgrades, and service changes. Typical residential permit costs range from $50-$400. Homeowners can typically pull permits for their own residence.
How much does an electrical permit cost in Illinois?
Residential electrical permits in Illinois typically cost $50-$400 depending on the scope of work and specific jurisdiction. Chicago has significantly higher permit costs than downstate municipalities. Costs vary significantly between cities - contact your local building department for exact fees.
What wire size do I need for a 20-amp kitchen circuit in Illinois?
12 AWG copper is required for all 20-amp circuits regardless of which NEC edition Illinois enforces - the ampacity tables in Table 310.16 have been unchanged since NEC 2017. Use 12/2 NM-B (Romex) for standard cable runs or 12 AWG THHN in conduit. See our kitchen wiring guide for complete requirements.
Does Illinois require GFCI in the kitchen?
Kitchen GFCI requirements depend on the NEC edition enforced in your specific Illinois jurisdiction. Under NEC 2023+, all kitchen outlets require GFCI. Under older editions, only countertop outlets near sinks are covered.
Do I need a permit for an EV charger in Illinois?
Yes - most Illinois jurisdictions require an electrical permit for Level 2 EV charger installation since it involves a new 240V circuit. The typical installation requires a 60A breaker with 6 AWG copper wire for a 48A charger. See our EV charger wiring guide for complete specs.
How does Illinois's electrical code compare to other states?
Illinois scores 47/100 (Permissive) on WireRef's compliance scale. This is a permissive score - the state may have gaps in licensing, permit enforcement, or code recency compared to stricter states.
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States are color-coded by NEC edition: 2023+ current, 2020 one cycle behind, older/local two+ cycles behind.
NEC 2023 references verified April 2026