Cook County Il Building Department 2026: Permits, Inspections & Services

Cook County Building Permits, Inspections & Services: What to Do First

If you are planning construction, remodeling, a fence, roof replacement, new garage, HVAC work or another project in Cook County, the first question is not “Which form do I need?” It is who actually has jurisdiction over the property. Cook County Department of Building and Zoning handles building and zoning matters in unincorporated Cook County and the Forest Preserves of Cook County. Properties inside Chicago or an incorporated suburban city or village normally use that municipality’s own building department.

Cook County Department of Building and Zoning Contact Information

Step 1: Confirm That Cook County Is Your Building Authority

This step can save you from preparing the wrong application. A Cook County mailing address does not automatically mean the county issues the building permit.

1. Open CookViewer.
   Go to the official CookViewer map.
2. Search the property.
   Enter the address or parcel information and locate the property on the map.
3. Check whether it is unincorporated.
   Use the map’s jurisdiction/unincorporated-area information. If the parcel is inside an incorporated city or village, that local government normally handles the building permit.
4. Only continue with Cook County forms if the county has jurisdiction.
   If you are still unsure, contact Building and Zoning at info.bnz@cookcountyil.gov before paying or submitting.

What Work Requires a Cook County Building Permit?

Cook County states that work in unincorporated Cook County generally requires a permit application unless it qualifies as an ordinary repair under the county code. Do not assume a project is exempt just because it is small or residential.

The county publishes separate requirement sheets for decks, fences, pools, generators, reroofing, interior remodels, solar systems, sheds/garages, signs, grading, windows, tents and other projects. Before assembling plans, open the official Permit Requirements page and select the flyer for your exact project.

Common Project Details People Often Miss

Fence projects

• Show the proposed fence on a current plat of survey.
• Show height, length, material and gate locations.
• The county’s current-linked fence flyer states residential fences along a common lot line may be up to 6 feet, while fences in front-yard and corner-side-yard setback zones cannot exceed 3 feet.
• The same flyer specifies 42-inch post-hole depth.
• If the fence encloses a qualifying pool or body of water, additional gate and contractor requirements apply.

Deck projects

The county’s deck requirement sheet calls for a current signed and sealed survey plus detailed construction drawings. Plans should show deck dimensions, distances from property lines, framing sizes and spacing, beam spans, support posts, footing/pier depth, stairs, rails, material and electrical work. The published deck sheet specifies a minimum footing/pier depth of 42 inches.

Interior remodeling

A useful scope should identify walls being removed or relocated, drywall work, plumbing/electrical fixtures, cabinets, equipment and other demolition or new work. Structural alterations, structural demolition or life-safety changes can trigger professional drawing requirements.

Re-roofing

Be ready to identify the roofing material, fire classification, flashing/gutter/soffit/fascia work, ice-and-water protection and ventilation. Roofing contractors must satisfy both applicable Illinois licensing requirements and Cook County contractor registration requirements.

Sheds and detached garages

The E-Permit portal states that new sheds and detached garages require permits and that detached sheds/garages larger than 144 square feet require electrical service. The county’s published guidance also requires a survey and site plan showing the structure and distances from property lines and other structures.

How to Apply for a Cook County Building Permit

1. Verify jurisdiction first.
   Use CookViewer. Do not pay a county deposit until you know the property is handled by Cook County Building and Zoning.
2. Open the project requirement sheet.
   Visit the Permit Requirements page and find the flyer matching your project.
3. Prepare the application package.
   Complete the permit application and gather the scope of work, contractor letters of intent, required plans, survey and supplemental trade applications.
4. Choose the correct submission method.
   For an eligible single-scope project, use the E-Permit portal. For work that is not available through E-Permits, or a project combining multiple permit types, follow the county’s digital-submission instructions and email the package to intake.bnz@cookcountyil.gov.
5. Watch for your permit/application number and deposit invoice.
   The permit number is important because you will use it with the property’s PIN to follow the application.
6. Pay the required deposit.
   The county currently publishes a $100 deposit for residential applications and $500 for non-residential applications. It is credited toward the final permit fee.
7. Monitor review comments.
   Cook County reviews applications across disciplines including zoning, architecture, electrical, plumbing and permit control/contractor registration.
8. Answer deficiencies together when possible.
   When the county sends its deficiency notice, prepare the requested corrections and send responses to permitcontrol.bnz@cookcountyil.gov. Include the permit number and avoid sending incomplete responses in many separate pieces when you can address them together.
9. Pay the final invoice and obtain the issued permit.
   A deposit or pending application does not mean construction is approved. Wait until the permit has actually been issued before beginning regulated work.

Basic Permit Document Checklist

Exact requirements depend on the project, but a typical application may need:

• Completed Cook County building permit application
• Detailed written scope of work
• Property Index Number (PIN)
• Estimated project cost
• Contractor information and Cook County registration numbers
• Signed letters of intent from contractors performing work
• Child Support Enforcement Declaration Form for applicable building, plumbing and electrical permits
• Plat of survey when required
• Site plan
• Architectural / construction drawings
• Electrical or plumbing supplemental application when applicable
• Well, septic, sewer, water or health approvals when applicable
• Other agency approvals when a fire district, township, MWRD, IEPA, highway authority, floodplain/wetland authority or another jurisdiction is involved

New construction

Cook County specifically lists a signed and sealed plat of survey dated within the previous five years, a site plan and signed/sealed architectural drawings among the core new-construction items. If the project will use a septic field, Cook County Department of Public Health septic approval is required at submission.

Cook County Building Permit Fees & Deposits

There is not one flat building-permit price for every project. The final permit fee depends on the applicable county fee schedule and the work being reviewed. The figures below are useful published amounts for common services, but always use the official invoice for your actual payment.

Check the official Building and Zoning fee page for the current schedule. For an invoice already issued, use the county’s Building and Zoning payment service.

How to Check a Cook County Building Permit Status

Once the application has been entered into the county system, you can check its status online without calling the office every time something changes.

1. Open the official Building Permit Status Search.
2. Enter the Building Permit Number.
3. Enter the property’s Property Index Number (PIN).
4. Select Search to review the status and available permit information.
5. If you do not know the PIN, use the Cook County Assessor link provided directly on the status page.

Applicants can also register email addresses for permit updates. If the department posts review comments or requests additional information, deal with those items promptly so the permit does not sit waiting for applicant action.

Cook County Building Inspections: How the Process Works

Construction inspections occur after the permit is issued. Cook County states that the issued permit information will identify the field inspectors and the construction stages that must be inspected.

The county also publishes a Field Inspectors by Township list covering building, electrical, plumbing and HVAC inspectors. The version currently posted by the county is dated July 2026.

1. Wait until the permit is issued.
   Do not treat a paid application deposit as authorization to build.
2. Review the inspection stages on your permit.
   Different projects can require different rough, underground, framing, trade or final inspections.
3. Find your assigned inspector.
   Open the official Building Permits page and use the current “Field Inspectors by Township” document.
4. Contact the correct trade inspector.
   Have the property address, permit number, your name, callback number and inspection type ready.
5. Do not cover work too early.
   Keep work visible when an inspection is required before concealment, backfill, drywall or another next construction stage.
6. Complete required final steps.
   For projects subject to the county’s engineering requirements, spot survey and final grade survey submissions may also be required.

Cook County Contractor Registration

Contractors performing work in unincorporated Cook County must be registered with Cook County Building and Zoning. Registration with the City of Chicago is not a substitute for Cook County registration.

Current county registration fees are $150 per trade for initial registration and $75 per trade for annual renewal. Different trades have different supporting-document requirements.

General contractors and other trades

• Company owner or corporate officer applies.
• Corporate/LLC documentation may be required.
• Cook County requires a certificate showing at least $1,000,000 in general liability coverage.
• Roofing contractors must also provide the applicable State of Illinois roofing license.
• Demolition contractors have additional bond requirements.

Homeowners doing their own work

Cook County allows qualifying homeowners to perform work themselves, but the homeowner must be registered and listed on the permit. The county says the homeowner’s “General” contractor registration is available at no charge, while registration fees may still apply for other required trades. The homeowner must reside at the permitted property and meet the county’s insurance requirements.

Contractor Registration Requirements Search Registered Contractors

Zoning: Check Before Designing Around Setbacks

A building permit does not eliminate zoning requirements. Setbacks, lot coverage, structure location, height and permitted uses can affect whether a design can be approved.

Cook County provides an online zoning-classification search for parcels in unincorporated Cook County. You will need parcel/PIN information.

The online classification tool is useful for research, but a map or web result should not be treated as a final legal determination for a complicated property or development decision.

Residential property sale: zoning certificate

When an unincorporated residential property goes under contract, Cook County requires a zoning certificate to verify zoning classification and identify outstanding permits, violations or judgments before closing. The certificate is for qualifying residential property in unincorporated Cook County, not properties inside Chicago or incorporated municipalities.

The published fee is $100 per lot, and the county asks applicants to allow up to five business days for the certificate to be emailed.

Other Cook County Building & Zoning Services

Business Occupancy: Simple Process

For a new business in unincorporated Cook County, start with the Business Occupancy application. If construction or remodeling is needed to accommodate the business, a building permit is added to the process. The county’s published process then moves through required inspections and, once requirements are satisfied, issuance of the certificate of occupancy.

An existing business changing operations may need its occupancy record updated and may also need a permit if construction or remodeling is part of the change.

If You Received a Cook County Building Violation

Do not ignore the notice. Cook County’s Building and Zoning violation page states that cited properties generally must be brought into compliance within 30 days. If correction requires a building permit, business occupancy approval, rezoning or another application, that filing must be addressed within the period stated by the county and your notice.

1. Read the violation description and deadline.
2. Identify whether it requires physical correction, a permit, occupancy approval, zoning action or reinspection.
3. If a permit is required, start that application rather than simply completing work without approval.
4. For a reinspection, contact the issuing inspector shown on the notice.
5. Keep written records of applications, corrections and communications.
6. If you received a hearing or court notice, follow that notice; do not assume correcting the property automatically cancels the appearance.

For violation questions, email violations.bnz@cookcountyil.gov.

What If Your Property Is Not in Unincorporated Cook County?

Stop before using the county permit forms. Incorporated municipalities maintain their own processes, permit fees, codes and inspection contacts. A Berwyn property, for example, should use the Berwyn Building Department process. The same jurisdiction rule applies to a property within Blue Island’s building jurisdiction or the Calumet City Building and Zoning system.

This is why checking the property boundary before downloading forms is worth the extra minute.

Before You Submit: 10-Minute Final Check

• Property confirmed as unincorporated Cook County
• Correct project requirement sheet reviewed
• Application completed in full
• PIN included
• Estimated project cost included
• Scope of work is specific rather than vague
• Survey/site plan included when required
• Plans include dimensions and code-related project details
• Every contractor is properly registered with Cook County
• Letters of intent are signed by the correct registered person
• Electrical/plumbing supplements included when applicable
• Required health, septic, township, fire, highway or environmental approvals addressed
• Files are readable PDFs and within current submission limits
• You know which email/portal you are submitting through

Cook County IL Building Department FAQs

Information reviewed: October 24, 2026. Permit forms, fees, staff assignments and submission procedures can change. Use the official Cook County links above for the live application, payment or final property-specific decision.