Illinois does not issue a statewide low voltage license, so getting licensed in Illinois means getting licensed by the specific city or village where you plan to work. Chicago runs the state’s most developed program and issues a dedicated Low Voltage electrical contractor license with a $150 initial fee, separate from its general electrical contractor license.1City of Chicago. Electrical Contractor License Smaller municipalities set their own rules, and a few require nothing specific at all. A bill introduced in 2025 would move licensing to the state level effective January 1, 2027, so the current municipal patchwork may not last.2Illinois General Assembly. SB2307 104th General Assembly
Why Licensing Is Local
The Illinois Department of Financial and Professional Regulation licenses dozens of trades and professions, but electricians and low voltage contractors are not among them. Authority instead flows from the Illinois Constitution’s home rule provisions, which let municipalities over 25,000 people and certain counties license professions and regulate for public safety.3Illinois General Assembly. Illinois Constitution – Article VII Non-home-rule towns can only act if state law hands them the power. The practical result: Chicago has detailed license categories and exams, a mid-size city like Mt. Vernon runs its own testing, and some rural villages have no program. You cannot rely on a single state-level answer, and you cannot assume a license from one city travels to the next.
What the License Covers
Low voltage work involves limited-energy circuits, which the National Electrical Code categorizes as Class 1, Class 2, and Class 3, along with communications circuits.4National Fire Protection Association. NFPA 70 National Electrical Code Chicago’s low voltage contractor license authorizes work on exactly those circuit classes.1City of Chicago. Electrical Contractor License In everyday terms, that covers:
- Fire alarm and detection systems, including panels, pull stations, and notification appliances
- Structured data and telecom cabling, including ethernet and phone systems
- Security and access control, including cameras, card readers, and intrusion panels
- Audio-visual and building automation controls
This is a narrower scope than a general electrical license. That is the point: if you only install low voltage systems, you don’t need to qualify as a general electrician in a jurisdiction that offers the split. But when a project needs standard power circuits run to feed a fire alarm panel, that portion is outside the low voltage license, and someone with the general credential has to do it.
Chicago’s Low Voltage Contractor License
Chicago issues the contractor license to a business, not to an individual. The initial fee is $150, and annual renewal is also $150. To qualify, the business must employ at least one licensed supervising electrician who passed the low voltage category exam.1City of Chicago. Electrical Contractor License Because of that two-tier structure, the individual credential comes first: you cannot apply for the contractor license until a qualifying supervising electrician is in place, and if that person leaves, the business’s license is in jeopardy until a replacement is hired or credentialed.
The Supervising Electrician Exam
Chicago now offers two supervising electrician exam categories, general and low voltage.5City of Chicago. Supervising Electrician License To sit for the low voltage exam, an applicant must be at least 21 and have a minimum of two years of cumulative experience installing, maintaining, or altering building wiring systems in the category being tested. Experience is verified through an original letter on company stationery from a currently licensed supervising electrician, listing the applicant’s duties, employment dates, and the employer’s contractor license number.6Continental Testing Services. Chicago 303 Supervising Electrician License – Exam Application Experience earned in a jurisdiction that doesn’t license contractors requires a verification letter from that jurisdiction along with a chronological work history.
The exam tests the National Electrical Code and how it applies to real wiring: circuit design, grounding, wiring protection, and blueprint reading. Pass the exam and meet the experience requirement, and you receive the supervising electrician license. That credential is what your employer (or your own business) then uses to apply for the contractor license.
Licensing Outside Chicago
Every other city sets its own rules, and they don’t line up. Mt. Vernon, for example, also requires supervising electricians to be at least 21 and to pass an open-book NEC-based exam with a minimum score of 70 percent.7City of Mt. Vernon. Electrical Contractor License Some jurisdictions accept proof of licensure from another Illinois municipality; others make you start from scratch regardless of what you already hold.
There is no substitute for calling the building department in each city where you plan to work. Three questions to ask:
- Do you issue a separate low voltage license, or does low voltage work fall under a general electrical contractor license?
- What exam or credentials do you require, and who administers the test?
- Do you recognize licenses from other Illinois municipalities, and if so, which ones?
Getting clear answers before you pay for applications and exam prep is the difference between a smooth entry and paying twice.
Bond and Insurance
Most Illinois municipalities that license contractors also require a surety bond as a financial guarantee that you’ll follow local codes and complete work as contracted. Amounts vary by city and commonly fall in the $5,000 to $25,000 range; Cicero, for instance, requires a $10,000 bond for a low voltage electrician license. Your actual out-of-pocket premium is a small percentage of that face amount, driven by your credit and financial history.
You will also need certificates of insurance. General liability coverage protects against property damage and bodily injury claims arising from your work, and workers’ compensation is required once you have employees. Minimum limits differ by municipality, but general liability policies at $1 million per occurrence are a common expectation. Have your insurance agent prepare certificates naming the municipality as a certificate holder before you submit the application, because the building department will want to see them on file during review.
Applying and What to Expect
Once the supervising electrician credential, bond, and insurance are in place, the contractor license application is mostly paperwork: business name, federal employer identification number, registered business address, bond certificate, and insurance certificates. Chicago accepts applications through its Department of Buildings for the $150 initial fee.1City of Chicago. Electrical Contractor License Later modifications to an existing license carry a $50 administrative processing fee, and replacement documents also cost $50 each.
Smaller municipalities may charge less and often handle applications in person at city hall. A few larger jurisdictions offer online portals. Expect the review to take a few weeks while the building department verifies your supervising electrician license, bond status, and insurance. Once approved, you’ll receive a license certificate or ID card to keep accessible on job sites and when pulling permits.
Consequences of Working Unlicensed
Working without a required license goes beyond a fine. Unpermitted work can trigger stop-work orders, force you to tear out and redo completed installations, and expose you to personal liability that your policy may not cover. General contractors who bring an unlicensed sub onto a project face their own regulatory consequences, so getting caught can end the referral relationships that feed your business, not just the current job.
The 2025 Statewide Licensing Bill
Senate Bill 2307, introduced in February 2025, would create the Electrician Licensing Act and shift licensing authority to the state for the first time. Under the bill, no one could install, repair, maintain, or supervise electrical wiring in Illinois without a state-issued license as either an electrical contractor or a supervising electrician, with the National Electrical Code adopted as the statewide standard.2Illinois General Assembly. SB2307 104th General Assembly
The proposed penalties are steep: civil fines up to $25,000 per offense, a business offense with a minimum $100 fine for a first criminal violation, and a Class A misdemeanor with a minimum $200 fine for repeat violations. Courts could also enjoin further electrical work.2Illinois General Assembly. SB2307 104th General Assembly The bill’s stated effective date is January 1, 2027. Whether it passes and how it would interact with existing municipal programs is not yet settled, but if you’re building a low voltage contracting business in Illinois, it’s worth tracking, because statewide licensing would change how you obtain and maintain your credentials.