Illinois Business License and Permit Requirements for Contractors

There is no Illinois business licence, so stop looking for one

Illinois does not issue a general state business licence in the way that some states do. DCEO's own step-by-step guide for new businesses does not send you to one. What it sends you to instead is a sequence: choose an ownership structure, register the name in the right place, register with the Illinois Department of Revenue, understand your employer obligations, and check whether your profession is licensed by IDFPR. That sequence is the closest thing Illinois has to a business licence, and it is spread across four bodies.

DCEO also flags the piece that catches contractors specifically: "Some municipalities and counties impose their own taxes in addition to the state and federal taxes that most businesses are responsible for", that new businesses should contact their local revenue department, and that "many communities restrict advertising, regulate pricing or require zoning permits". In a state with as many units of local government as Illinois, the local layer is not an afterthought.

• State registrations that most contractors need: Illinois Department of Revenue, and IDES once you cross the employment threshold.
• State trade licences, only if your trade is one of the few: roofing, plumbing, fire sprinkler.
• Entity filing with the Secretary of State, or an assumed name filing with your county clerk.
• A municipal licence, which is where general contracting is licensed and where permits are issued.

Official sources: Illinois DCEO: Step by Step Guide; Illinois DCEO: Begin Here; IDFPR: Professions and Industries Regulated by IDFPR; IDPH: Plumbing; Office of the State Fire Marshal: Fire Sprinkler Contractor Information

The Department of Revenue registration is the one nearly every contractor needs

DCEO states that in Illinois most businesses are required to be registered or licensed by the Illinois Department of Revenue, and that registration is required if you plan to hire employees, buy or sell products wholesale or retail, or manufacture goods. IDOR runs it through MyTax Illinois, publishing a direct registration link on its Businesses page along with tools to apply for or renew a sales tax exemption number and to verify a business's registration status.

Register before you need the account rather than after, because other filings reference it. Registration is what produces the account number your accountant and your customers will ask for, and IDOR's Businesses page is also where the withholding and sales and use tax material sits once you have employees or over-the-counter sales.

And read IDOR's construction answer before you set prices. The Department states that a construction contractor is not required to collect sales tax when incorporating tangible personal property into real estate under a construction contract, because Illinois law treats the contractor as the end user of those items; the contractor incurs use tax on the cost price and either pays it to the supplier or remits it to IDOR where the supplier is not registered. Selling tangible personal property "for use without installation" is different and does create retailers' occupation tax liability, under 86 Ill. Adm. Code Sections 130.1940 and 130.2075. Most contractors are on the use tax side of that line for most of what they buy, and pricing a job as though you will collect tax from the customer produces the wrong number.

Official sources: Illinois DCEO: Step by Step Guide; Illinois Department of Revenue: Businesses; Illinois Department of Revenue: Must construction contractors collect sales tax?

State trade licences: a short list, and expensive to be wrong about

IDFPR is the main state licensing agency and its published list of regulated professions carries exactly two construction entries: Roofing Contractor and Qualifying Party Roofing Contractor. If you roof or waterproof, that is a state licence you must hold before you take work, and 225 ILCS 335/3 requires a continuous bond of $10,000 for a limited licence or $25,000 for an unlimited one, plus evidence of public liability and property damage insurance, workers' compensation cover and an unemployment insurance employer account number with no delinquent payments. IDFPR's application packet publishes a $125.00 non-refundable application fee and states that "the license will expire on December 31st of each odd numbered year regardless of when it is issued".

Plumbing is licensed and registered by IDPH under a separate Act. 225 ILCS 320/13.1 requires the plumbing contractor registration to be filed each year on or before the last day of September, expiring September 30, with general liability of $100,000 per occurrence and a minimum $300,000 aggregate for bodily injury, property damage cover of $50,000 or a minimum $300,000 combined single limit, workers' compensation with $500,000 employer's liability, and an indemnification bond of $20,000 or a letter of credit in the same amount. IDPH states that plumber licences renew by April 30 following issuance and carry an annual continuing education requirement.

Fire sprinkler contracting is a third state licence, administered by the Office of the State Fire Marshal rather than by either of the above. The Fire Marshal states that the licence is required of all individuals and businesses who wish to engage in fire sprinkler contracting in the State except as otherwise exempted in Section 15(c) of the Act, that the governing statute is 225 ILCS 317, and that the rules are at Title 41, Chapter 1, Part 109. It licenses fire sprinkler inspectors separately and publishes a continuing education requirement.

If your trade is not on that list, no state agency is going to issue you a construction licence, and the advertising rules that attach to the two licensed trades are worth noting as a warning against implying otherwise. 225 ILCS 335/5 requires roofing licensees to include the licence number and name in advertising and makes violations a Class A misdemeanour carrying $1,000 fines with each advertisement run counted separately; 225 ILCS 320/5 imposes the same discipline on plumbing advertising and requires the licence number on vehicles.

Official sources: IDFPR: Professions and Industries Regulated by IDFPR; 225 ILCS 335/3 (application for roofing contractor license); 225 ILCS 335/9 (licensure requirement); IDFPR: Licensed Roofing Contractor application packet (DPR-RF); 225 ILCS 335/5 (display of license number; permits; advertising); 225 ILCS 320/13.1 (plumbing contractors registration); 225 ILCS 320/5 (advertising); IDPH: Plumbing; Office of the State Fire Marshal: Fire Sprinkler Contractor Information

The municipal licence is the one that decides whether you can work

This is where the practical licence lives. Chicago is the fullest published example and the one worth studying. Its Department of Buildings requires a general contractor licence "to perform most types of building construction, alteration, repair, and demolition work within the City of Chicago", triggered by preparing or submitting a bid, undertaking a regulated activity directly or through others, hiring or supervising those who do, or exercising control over the means and methods. Five classes are keyed to maximum project value and minimum insurance, from Class E at $500,000 of project value and $1 million per occurrence up to Class A at unlimited value and $5 million per occurrence, with calendar-year 2026 licence and renewal fees from $300.00 to $3,500.00 and a $100.00 reinstatement fee per year or fraction of a year expired.

The City also issues a home repair licence through Business Affairs and Consumer Protection for residential fixing, replacing, altering, converting, modernizing or improving work, and states that "if the work requires a building permit, a general contractor license is required instead of a home repair license". Separate City licences exist for electrical contractors, supervising electricians, mason contractors, plumbing contractors, apprentice plumbers, journeyman plumbers, drain layer contractors, elevator mechanic contractors, supervising elevator mechanics, stationary engineers, crane operators and apprentice crane operators, board-up companies, residential real estate developers, and public way work contractors through the Department of Transportation. The City states expressly that "additional licenses issued by the State of Illinois may be required" on top of its own, and that a State-licensed plumbing contractor must also hold the City plumbing contractor licence to work in Chicago.

Outside Chicago the answer varies and there is no shortcut. What the statutes make clear is that municipalities are entitled to do this: 225 ILCS 335/11 preserves the power of a municipality, city, county, incorporated area or school district to regulate the quality and character of work through permits and inspections, and 225 ILCS 320/16 lets a municipality of 500,000 or more operate its own board of plumbing examiners. Call the building department where the job is, ask whether contractor registration is required, ask what insurance certificate they want and in whose name, and ask before you bid rather than after you win.

Official sources: City of Chicago: General Contractor License; City of Chicago: Chicago Trade License Information Center; 225 ILCS 335/11 (application of Act); 225 ILCS 320/16 (local regulation by large municipalities)

Employer registrations and the duties that arrive with your first residential customer

Once you hire, two more registrations come into view. DCEO states that a business is typically required to make unemployment insurance contributions to IDES if it has employed one or more workers in each of 20 or more calendar weeks, or paid at least $1,500 in total wages during a calendar quarter, and IDES requires contributions and wage reporting on Form UI-3/40 "on or before April 30, July 31, October 31, and January 31". DCEO separately states that under the Workers' Compensation and Workers' Occupational Diseases Acts an employer must provide insurance for accidental deaths, injuries and occupational diseases arising in the course of employment, that temporary workers who do not receive company benefits are still covered, and that companies may apply to the Illinois Workers' Compensation Commission to become self-insured.

And one set of duties arrives without any registration at all. The Home Repair and Remodeling Act binds every person doing residential repair or remodelling in Illinois. Section 15 requires a written contract for work over $1,000 stating the total cost with parts and materials listed with reasonable particularity, any charge for an estimate, and the business name and address. Section 20 requires the pamphlet "Home Repair: Know Your Consumer Rights" to be delivered before the contract is executed, with a signed acknowledgment above $1,000. Section 25 requires public liability and property damage insurance of $100,000 per person and $300,000 per occurrence for bodily injury and $50,000 per occurrence for property damage, plus $10,000 per occurrence for work not conforming to applicable State, county or municipal codes, unless net worth exceeds $1,000,000 on financial statements from the preceding 13 months.

If you are building a compliance checklist from this article, that last paragraph is the part with no gatekeeper. Nobody will refuse you a licence for missing it. The consequence shows up later, in a dispute, which is precisely why it is worth doing first.

Official sources: Illinois DCEO: Step by Step Guide; IDES: Quarterly Filing Requirements; 815 ILCS 513/15 (written contract); 815 ILCS 513/20 (consumer rights brochure); 815 ILCS 513/25 (insurance required)

Check the official page yourself before you file or sign

Illinois spreads contractor rules across more agencies than most states: IDFPR for roofing, IDPH for plumbing, the Office of the State Fire Marshal for fire sprinkler work, the Illinois Department of Revenue for tax registration, IDES for unemployment insurance, the Secretary of State for entity filings, your county clerk for an assumed name, and your own municipality for the licence that actually lets you pull a permit. No single page carries all of it, and each one changes on its own schedule.

Two practical consequences. First, before you file an application or sign a contract, open the specific agency page for your trade, confirm the figure you are relying on, and keep a dated copy of what you read. Second, call your municipality before you assume it has no rules: Illinois has more units of local government than any other state, and the absence of a state licence for your trade tells you nothing about whether your village requires one. DCEO runs a Business Information Center on 800.252.2923 for exactly this kind of question.

Official sources: Illinois DCEO: Begin Here; Illinois DCEO: Step by Step Guide