Accessory Structures in Champaign, IL (2026)
3 verified accessory structures rules for Champaign, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Champaign allows one Accessory Dwelling Unit per lot, attached, detached, or internal, in any residential zoning district under Sec. 37-627. Detached and internal ADUs max out at 600 square feet on lots up to 7,200 square feet, or 800 square feet on larger lots, per Sec. 37-628(b).
Champaign Accessory Dwelling Unit Zoning Rules
Some RestrictionsChampaign Municipal Code §§ 37-627, 37-628(a)-(b) (Accessory Dwelling Units, Permitted Districts & Performance Standards)
Sec. 37-627. - Permitted Zoning Districts. Accessory Dwelling Units, in any type defined herein, shall be permitted in any Residential Zoning District listed in Section 37-42; Table III-A of this Chapter. Sec. 37-628. - Performance Standards. (a)Number of Accessory Dwelling Units. There shall be a maximum of one Accessory Dwelling Unit allowed per lot. (b)Size of ADU. For lots up to 7,200 squar...
Shed & Carport Rules
Champaign caps detached accessory structures, sheds, detached garages, and similar buildings, on single-family lots at a combined 625 square feet, 18 feet in height, with a minimum 2-foot setback from rear and side lot lines under Sec. 37-222(a).
Champaign Accessory Structure Size & Setback Rules
Some RestrictionsChampaign Municipal Code § 37-222(a) (Standards for Accessory Structures)
Sec. 37-222. - Standards for Accessory Structures. (a)In any residential zoning district, accessory structures, including private garages, and uses which do not involve the conduct of a business, may be erected under the following conditions:(1)When an accessory structure is detached from the principal building, it shall be separated by a minimum distance of three (3) feet.(2)The maximum height...
Garage Conversions
Champaign lets a homeowner convert an existing detached garage into an Accessory Dwelling Unit under Sec. 37-628(c); the ADU floor area counts toward the ADU size cap and the garage's remaining area counts toward the accessory-structure cap, and a garage built more than 10 years ago can keep its existing setback under Sec. 37-628(f)(3).
Champaign Garage-to-ADU Conversion Standards
Some RestrictionsChampaign Municipal Code § 37-628(c) & (f)(3) (ADU Performance Standards, Detached ADU Combined with Garage/Conversion)
(c)Detached ADUs with other Accessory Structures.(1)Detached ADUs are not allowed to be combined with any Accessory Structure other than a detached garage.(2)For Detached ADUs combined with a detached garage, the floor area of the ADU shall count toward the size allowance for ADUs and the square footage of the garage shall count toward the size allowance for Accessory Structures as provided for...
Looking for Champaign County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Champaign city rules.
Accessory Structures in Champaign County →