Accessory Structures in Waukegan, IL

Waukegan maintains 143 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 Waukegan falls on the strict-to-permissive spectrum compared to other cities.

ADU Owner Occupancy

Waukegan requires the owner of an accessory dwelling unit lot to live on the same property as the ADU, a residency mandate written into UDO Section 9.03.C.1.f alongside the rental licensing rule.

Key details: Owner residency: Required on same lot as ADU. Governing section: UDO Sec. 9.03.C.1.f. Applies to: All detached ADUs citywide. Reviewed at: Site plan review approval.

An ADU lot where the property owner does not maintain primary residency on-site violates Section 9.03.C.1.f and can result in a code enforcement finding against the zoning approval for the accessory dwelling unit, potentially jeopardizing its continued legal use.

Compared to other cities, Waukegan takes a harder line on adu owner occupancy. The enforcement and penalty structure reflects that.

Tiny Homes

Waukegan's accessory dwelling unit rule flatly bars axels or wheels on the structure, closing the door on towable tiny homes and park-model trailers being used as detached ADUs under UDO Section 9.03.C.1.d.

Key details: Wheeled/towable units: Barred as ADUs. Governing section: UDO Sec. 9.03.C.1.d. ADU size cap: 900 sq ft (Sec. 9.03.C.1.c). Design match: Must match principal dwelling exterior.

Placing a wheeled tiny home, travel trailer, or park-model unit on a lot as an accessory dwelling unit violates the no-axels-or-wheels standard of Section 9.03.C.1.d and does not qualify for ADU site plan review approval under Table 9.03-1.

This is one of the stricter rules in Waukegan's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Shed & Carport Rules

Waukegan limits residential sheds to one per lot, 144 square feet in the R1 through R5 districts, placed only in the rear or interior side yard, and requires a building permit under UDO Section 9.03.C.32.

Key details: Max shed size (R1-R5): 144 sq ft. Sheds per lot: One. Allowed location: Rear or interior side yard. Permit required: Building permit. Vehicle storage in shed: Prohibited.

Building a second shed on one lot, exceeding 144 square feet in an R1 through R5 district, placing a shed in the front or corner side yard, storing a car, truck, or van inside a shed, or skipping the required building permit violates Section 9.03.C.32 and Table 9.03-1 and is subject to code enforcement.

ADU Rules

Waukegan allows one detached accessory dwelling unit per lot in the R1 through R5, L1, L2, and L3 districts, capped at 900 square feet, subject to site plan review under UDO Section 9.03.C.1.

Key details: Max ADU size: 900 sq ft. ADUs per lot: One. Location: Rear yard only, detached. Review required: Site plan review (Sec. 4.09). Eligible districts: R1-R5, L1, L2, L3.

Constructing a second detached ADU on one lot, placing an ADU outside the rear yard, exceeding the 900-square-foot cap, or building without the required site plan review approval violates Section 9.03.C.1 and Table 9.03-1, and can be enforced through the City's zoning and building permit process.

The Bottom Line

Waukegan is tougher than many cities when it comes to accessory structures. Out of the 4 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Waukegan, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Waukegan's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.