Cook County, Illinois

Licensed Trade Records in Cook County, Illinois

Illustration for home services in Cook County — Illustration, not a business photoPrepare brief →

Browse 2,907 verified licensed trade contractors registered across Cook County, Illinois (including Chicago, Evanston, Schaumburg, Arlington Heights). Every record is compiled from Illinois Department of Public Health & Department of Financial and Professional Regulation (IL IDPH / IDFPR) public credential files under Illinois Plumbing License Law (225 ILCS 320), Illinois Roofing Industry Licensing Act (225 ILCS 335), and Municipal Contractor Registration Ordinances.

Official State Authority: Illinois Department of Public Health & Department of Financial and Professional Regulation (IL IDPH / IDFPR) Official Registry · County Seat: Chicago

Municipalities in Cook County (1)

Select a city or town in Cook County to view local permit guidance and registered licensed trade records:

2907 licensed trade records · Cook County, IL

Public Directory Quality: Official IL IDPH / IDFPR license records across Cook County · Zero sponsored order · Never sold as a lead · How our data works →

All trades directory — Cook County

2907 matching records across 1 open municipalities · 25 on this page · Contactable records first, then alphabetical.

Show registered-address map (25 records on this page)20 approximate areas

Shaded areas mark approximate postal or city locations, not premises or service areas. Circle sizes are illustrative, not postal boundaries. Some records share the same area. Private addresses are excluded.

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Numanovic Construction CO

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 3708 W AGATITE AVE 2, Chicago, IL 60625

1493515 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Nyberg Enterprises, Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 4525 N LOWELL AVE, Chicago, IL 60630

1352753 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

O'bannon Sewerage/Drainage

Official license file From the official license file Plumbing · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 13000 S AVENUE N # 1, Chicago, IL 60633

52704 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

O'malley Quality Construction , Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 5970 N NEWARK AVE, Chicago, IL 60631

1573316 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

O.g. Hvac Services

Official license file From the official license file Heating & cooling · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 2328 N KOSTNER AVE, Chicago, IL 60639

1353791 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Oakland Renovation

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 4244 S COTTAGE GROVE AVE, Chicago, IL 60653

1547047 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Oasis Heating & Cooling, Inc. Of IL.

Official license file From the official license file Heating & cooling · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 5736 N WESTERN AVE 1, Chicago, IL 60659

1800481 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Oasis Heating And Cooling

Official license file From the official license file Heating & cooling · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 6130 N CHRISTIANA AVE, Chicago, IL 60659

1337313 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Octavios Construction Fire Service Inc

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 9911 S EXCHANGE AVE, Chicago, IL 60617

1694777 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Ofenloch Mechanical

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 4010 N NASHVILLE AVE 1ST, Chicago, IL 60634

1694879 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Off The Top Construction

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 1409 S TRUMBULL AVE 3, Chicago, IL 60623

1681419 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Ogrin Construction

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 2512 W 111TH ST 1, Chicago, IL 60655

74721 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Ok Heating & Cooling Inc

Official license file From the official license file Heating & cooling · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 446 N WESTERN AVE, Chicago, IL 60612

1445239 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Old Fashion Const Co Inc

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 3835 W SCHOOL ST 1ST, Chicago, IL 60618

49434 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Old Masters Construction

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 400 W ONTARIO ST 901, Chicago, IL 60610

1742802 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Old Veteran Construction

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 10942 S HALSTED ST, Chicago, IL 60628

1302078 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Oleg Heating & Cooling Corp.

Official license file From the official license file Heating & cooling · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 2632 W SUPERIOR ST 2, Chicago, IL 60612

1095904 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Olivera Excavating & Demolition

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 3225 S WESTERN AVE, Chicago, IL 60608

1381561 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Olympic Marble & Granite Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 815 S CICERO AVE, Chicago, IL 60644

1679944 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Omega Carpentry CO

Official license file From the official license file Carpentry · City of Chicago Department of Business Affairs and Consumer Protection · Specialty scope: Carpentry, Joinery & Millwork

Registered address: 7284 W DEVON AVE, Chicago, IL 60631

1224039 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Omega Structures, Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 4416 W BELMONT AVE OFFIC, Chicago, IL 60641

36582 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

On The Spot Construction

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 7148 S BLACKSTONE AVE 1 #, Chicago, IL 60619

45491 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

On Time Construction Services

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 1041 W GRAND AVE, Chicago, IL 60642

1517278 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

One Day Luxury Baths Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 3064 N CLYBOURN AVE 1ST FLOOR 1, Chicago, IL 60618

1802417 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

One Way Construction, Inc.

Official license file From the official license file General contracting · City of Chicago Department of Business Affairs and Consumer Protection

Registered address: 6226 W ADDISON ST, Chicago, IL 60634

1335489 · Source dated 2026-10-20 · Service area not confirmed. · Verify on IL portal →

No public phone or website on record.

Frequently Asked Questions — Cook County, IL

How are licensed trade credentials verified in Cook County, Illinois?

Records across Cook County are sourced directly from the Illinois Department of Public Health & Department of Financial and Professional Regulation (IL IDPH / IDFPR). Illinois Plumbing License Law (225 ILCS 320), Illinois Roofing Industry Licensing Act (225 ILCS 335), and Municipal Contractor Registration Ordinances

Which municipalities are covered in the Cook County directory?

Cook County coverage includes Chicago, Evanston, Schaumburg, Arlington Heights, Palatine, Skokie, Des Plaines, Orland Park, Tinley Park, Oak Lawn, with County Seat in Chicago.

Are licensed contractors in Cook County, IL required to carry insurance and surety bonds?

Yes. Under Illinois licensing authority regulations, licensed trade contractors typically must maintain active Commercial General Liability insurance, appropriate surety bonds, and state Workers' Compensation coverage before pulling municipal permits.

Other Counties in Illinois

Before the first call

Describe the job and ask whether it is within their scope and service area.
Check the credential with its issuing authority and ask what applies where the work will happen.
Ask about insurance, availability, who will do the work, and a written scope.
Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.

Prepare a project brief

Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.