Building permits in Cook County — The most populous county in Illinois and the second-most populous in the U.S. — are issued by Department of Building & Zoning. Cook County enforces the Cook County Building Code (ICC-based).
This guide covers what requires a permit, the Cook County E-Permits, fees, trade permits, and inspections — so your Cook County project stays on track.
Cook County — the most populous county in Illinois — issues building permits only for properties in unincorporated areas of the county through the Department of Building & Zoning. If your property is inside an incorporated city or village (including Chicago), that municipality handles your permits. Use the CookViewer mapping tool to verify if your property is in unincorporated Cook County. All permits must be submitted digitally. The county offers 14 E-Permit types for common projects (deck, fence, re-roof, etc.).
Illinois enacted its first-ever statewide building code on January 1, 2025 via Public Act 103-0510. All municipalities and counties must now enforce codes at least as stringent as the ICC model codes (IBC, IRC, IEBC). The Illinois Capital Development Board (CDB) oversees baseline compliance. However, each jurisdiction still administers its own permitting — processes, fees, and review timelines vary widely by city and county.
What requires a building permit in Cook County?
Under locally adopted codes, a permit is required for most construction activities:
Permit required
- New residential and commercial construction, additions
- Structural and load-bearing alterations
- Reroofing, windows, siding, and exterior changes
- Electrical, plumbing, and HVAC installations
- Decks, driveways, fences, pools, sheds, generators
- Flatwork, masonry walls, sump pumps, signs, tents
Typically exempt
- Painting, wallpapering, tiling, carpeting, cabinet installation
- Countertop replacement and similar finish work
- Ordinary repairs per Section 102-105.3 of Cook County Code
- Minor maintenance items not affecting structural, electrical, or plumbing systems
Exemptions are narrow and scope-specific. When unsure, confirm with the building department before starting — see the penalty note below.
Get the permit issued before starting work. Building without a permit in unincorporated Cook County can result in fines, stop-work orders, and mandatory removal of unpermitted work.
Who handles permitting in Cook County?
The Department of Building & Zoning handles plan review, permit issuance, and construction inspections. Permits are managed through the Cook County E-Permits.
| Detail | Information |
|---|---|
| Office | Department of Building & Zoning — 69 W Washington St, Suite 2830, Chicago, IL 60602 |
| Phone | (312) 603-0500 |
| Online portal | Cook County E-Permits |
| Code cycle | Cook County Building Code (ICC-based) |
| Review timeline | 10–15 business days residential; 15–30 business days commercial |
| Contractor license | Local registration + state trade licenses |
Apply at the Cook County E-Permits. Register an account, start a new application, upload required documents (site plan, construction drawings, energy code compliance), and pay fees. Print and post the permit card on-site before work begins.
Cook County building permit cost
Cook County permit fees are typically valuation-based. Plan review fees are calculated as a percentage of the building permit fee.
| Fee component | How it works |
|---|---|
| Residential building permit | Based on estimated cost of work |
| Commercial building permit | Based on estimated cost of work |
| Application deposit | $100 minimum (all permits) |
| Plan review fee | Included in permit fee structure |
| E-Permits (deck, fence, roof, etc.) | Streamlined flat-fee types |
| Work-without-permit | Double fees + stop-work orders + fines |
Want a precise number for a specific Cook County project? Send us the scope and valuation and we'll return a fee estimate alongside a filing timeline.
Cook County trade permits
Electrical, plumbing, and mechanical work each needs its own permit and appropriately licensed tradespeople.
Electrical permits
Required for service installations, panel upgrades, solar PV, EV chargers, and most wiring alterations — performed by an electrician licensed at the local level (Illinois does not issue a statewide electrician license).
Plumbing permits
Required for new plumbing, repipes, water heater changeouts, fixtures, backflow, and sewer connections — performed by a contractor licensed through the Illinois Department of Public Health (IDPH).
Mechanical (HVAC) permits
Required for HVAC installations, changeouts, ductwork changes, and venting modifications — performed by a qualified mechanical contractor per local requirements.
Miscellaneous & specialty
Fencing, pools, decks, sheds, and patio covers may require special permits depending on size and utility hookups. Demolition, sign, and right-of-way permits follow separate tracks.
Verify contractor licensing. Illinois does not issue a statewide general contractor license — general contractor licensing is handled at the local city or county level. However, two trades are state-regulated: plumbers are licensed by the Illinois Department of Public Health (IDPH), and roofing contractors are licensed by the Illinois Department of Financial & Professional Regulation (IDFPR) under the Roofing Industry Licensing Act. Electricians and HVAC technicians are regulated locally. Workers’ compensation insurance is mandatory for any Illinois employer — construction is classified as extra-hazardous. Verify licensing at idfpr.com/LicenseLookUp.
How to get a building permit in Cook County
Verify property is in unincorporated Cook County
Use the CookViewer mapping tool to confirm your property is in unincorporated Cook County — not inside an incorporated municipality. Contact Building & Zoning at (312) 603-0500 with questions.
Select E-Permit or full application
For qualifying projects (deck, fence, re-roof, shed, etc.), use the online E-Permits system. For larger projects, email application and documents to intake.bnz@cookcountyil.gov.
Upload documents & pay deposit
Upload plat of survey, scope of work, letter of intent from contractor, and construction drawings. Pay $100 minimum deposit.
Plan review & corrections
Staff reviews against Cook County Building Code. 10–15 business days residential; 15–30 commercial. Address any correction notices.
Pay remaining fees & receive permit
Pay the remaining permit fee upon approval. Print e-permit and post on-site before construction begins.
Schedule inspections
Schedule inspections through Building & Zoning. Typical checkpoints: foundation, framing, rough-in MEP, insulation, final. Certificate of Occupancy required before occupancy.
Inspections in Cook County
Schedule inspections through the Cook County E-Permits or by calling (312) 603-0500. Standard checkpoints include foundation, framing, rough-in MEP, insulation, and final. Post the permit card on-site and maintain approved plans. A final inspection and Certificate of Occupancy are required before legal occupancy.
Address correction notices before requesting a re-inspection; a final inspection and Certificate of Occupancy are required before legal occupancy or use.
Official Cook County permitting resources
- 🏛️ Cook County Building & Zoning
- 💻 Cook County E-Permits Portal
- 📋 CookViewer (verify unincorporated status)
- 🪪 IL License Lookup (IDFPR)
Simplify Cook County permitting with Alliance Permitting
Cook County's Cook County E-Permits, valuation-based fees, and Illinois's local licensing requirements reward applicants who prepare complete packages from the start. Alliance Permitting is a permit expediter for Cook County — our permit expediting services pair AI-driven document review with experts who know the Department of Building & Zoning process, so your Cook County submissions move faster.
Trusted by leading builders and brands — including Dream Finders Homes, Tesla, Verizon, Hyatt, and Sunnova.
Contractors and builders choose Alliance for Cook County because we deliver:
- Local expertise — we know Department of Building & Zoning, the Cook County E-Permits, and the Cook County Building Code (ICC-based).
- Complete oversight — track every permit and inspection across all your jobs in one place.
- Error-free submissions — AI pre-checks plus expert review catch issues before they become correction cycles.
Alliance Permitting is a permit documentation and submission company: we prepare your paperwork, file it correctly, and coordinate with the building department through issuance — including preparing private-provider documentation where that option is available. We are not a contractor and do not perform licensed plan review or inspections; that work stays with your team and the jurisdiction.
Need a Cook County building permit?
Get your Cook County project permitted right. Alliance Permitting handles your applications through the Cook County E-Permits — so you build, not wait.
More Illinois permitting guides
This guide is provided by Alliance Permitting for general informational purposes and reflects publicly available information believed accurate as of June 2026. Permit requirements, fees, and processes change; always confirm current details with the Department of Building & Zoning before filing. This is not legal advice.