How North Chicago Handles Accessory Structures: A Practical Guide

North Chicago maintains 38 local ordinances across all categories, and 4 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where North Chicago falls on the strict-to-permissive spectrum compared to other cities.

Carport Rules

North Chicago lists carports as a permitted accessory structure under Section 4.4.3.8 of the Zoning Ordinance and requires a building permit. Detached carports must sit no closer than five feet to the principal building or any lot line (Section 4.4.2.9), may not be located in a required front yard or required side yard (Section 4.4.2.6), and may not exceed ten feet in height for non-garage accessory structures (Section 4.4.2.7).

Key details: Permit: Required (Sec 1.3.2). Authority: Sec 4.4.3.8 Carports. Height Limit: 10 ft non-garage. Setback: 5 ft from principal/lot line. Yard: No front or side yard.

Building a carport without a North Chicago building permit, in a required front or side yard, taller than ten feet, or closer than five feet to the principal building or any lot line violates Section 4.4 of the Zoning Ordinance. The Department of Economic and Community Development may issue stop-work orders, require removal or after-the-fact permitting, and assess civil fines under Section 9.3.1 of not less than $150 and not more than $750 per offense, with each day of continued violation a separate offense under Section 9.2.2.

Shed Rules

Sheds in North Chicago may not exceed 120 square feet and must be set back at least 5 feet from any property line per Zoning Ordinance Section 4.4.3.2. Building permits required.

Key details: Max Shed Size: 120 sq ft. Setback: 5 ft minimum from any property line. Max Garage: 865 sq ft (unless Director approves larger). Plumbing: Not permitted in accessory buildings. Contact: permits@northchicago.org.

Unpermitted structures receive a notice to either obtain a retroactive permit (with double fees) or remove the structure within 60 days. Fines of $100–$500 apply for non-compliance.

ADU Rules

North Chicago permits limited accessory dwelling units within the Urban Redevelopment Overlay (URO) District. ADUs must be within a principal building of at least two stories and comply with ADA and IL Accessibility Code.

Key details: Where: URO District with B2 underlying zoning only. Building: Must be within principal building of 2+ stories. ADA: Full ADA and IL Accessibility Code compliance required. Layout: Bath/kitchen directly accessible from living space. State Law: No statewide ADU mandate.

Unpermitted ADUs face stop-work orders and removal or legalization requirements. Fines of $500–$2,000 apply for unpermitted construction. Properties with illegal ADUs may face title issues at sale.

Garage Conversions

Garage conversions in North Chicago require building permits and zoning compliance. Accessory buildings may not have plumbing fixtures per Section 4.4.2.8, limiting conversion options.

Key details: Plumbing: Not permitted in detached accessory buildings. Proximity: 5-10 ft from principal = drywall required. Parking: 2 spaces per dwelling must be maintained. Permit: Building permit required. Contact: Economic & Community Dev: 847-596-8650.

Unpermitted garage conversions face fines of $500–$2,000, mandatory permit acquisition (double fees), and may need to be restored to garage use if code requirements cannot be met.

The Bottom Line

North Chicago's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming North Chicago is broadly strict or permissive.

All of the above reflects North Chicago's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.