Waukegan requires a building permit for every carport, garage, shed, gazebo, and similar accessory structure (including replacements). Detached carports are governed by Section 9.03 (Accessory Structures) of the Unified Development Ordinance adopted July 1, 2024, must sit behind the principal dwelling's rear building line, may not exceed the principal building's height, and may not occupy more than 40 percent of the required yard.
Waukegan's Building and Code Department requires a building permit for all garages, sheds, carports, and gazebos within the City, including replacements. Plan review is administered under the City's adopted 2021 International Residential Code. Tool or storage structures under 200 square feet do not require a licensed-professional design or a frost foundation; structures from 200 to 600 square feet must use an IRC-compliant foundation and submit detailed construction prints; light-frame structures over 600 square feet (or other construction over 400 square feet) require Illinois-licensed architect or structural engineer sealed plans on a frost foundation. Permit fees are $75 minimum (under $3,000 of construction value) or $125 base plus 3 percent of construction value over $3,000, with a $150 zoning review and a separate $75 to 1.5-percent plan review charge. Zoning siting is governed by Article 9 (Section 9.03, Accessory Structures) of the Unified Development Ordinance adopted by City Council on July 1, 2024, supplemented by the legacy Zoning Ordinance Section 4.7 (Accessory Buildings) for items not yet recodified. Section 4.7-2 limits the combined footprint of all detached accessory structures to no more than 40 percent of the area of the yard in which they sit; Section 4.7-3 requires that no detached accessory structure exceed the height of the principal building or be built in front of the rear building line of the principal building; Section 4.7-5 requires at least six feet of separation between any detached accessory structure and any other accessory or principal building. UDO Section 8.07 establishes minimum residential lot sizes that limit how large a carport a particular lot can support: R1 (40,000 sq ft minimum lot, 45-foot maximum building height), R2 (7,200 sq ft, 45 ft), R3 and R4 (5,000 sq ft, 45 ft), and R5 (5,000 sq ft, 80 ft). Attached carports must instead meet the front, side, and rear setbacks of the principal dwelling for the underlying residence district shown in UDO Table 8.07-1.
Building a carport without a Waukegan building permit, in front of the principal building's rear building line, taller than the principal dwelling, or occupying more than 40 percent of the yard area violates Section 4.7 of the Zoning Ordinance and Section 9.03 of the UDO. The Building and Code Department may issue stop-work orders, require removal or after-the-fact permitting, and assess civil fines under the general Zoning Ordinance penalty (Section 3.14) of $25 to $750 per offense, with each day of continued violation a separate offense.
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