2 county-level rules, plus city-specific rules for 2 cities in DuPage County, Illinois.
Verified from official government sources
In unincorporated DuPage County, sheds are detached accessory buildings regulated by the DuPage County Zoning Ordinance (Chapter 37, Sec. 37-701 through 37-704). A building permit is required from the DuPage County Building & Zoning Department before construction. Construction plans are required when the shed exceeds 150 sq. ft. Size, setback, and height limits depend on the single-family zoning district (R-1 through R-4) and lot size.
In unincorporated DuPage County, both detached garages and conversions of existing attached garages are regulated under the DuPage County Zoning Ordinance, Chapter 37, Sec. 37-701 through 37-704. A building permit is required from the County Building & Zoning Department, and converting an attached garage to habitable space triggers building code compliance and may forfeit required off-street parking. Replacement detached garages must meet the same size, setback, and height limits as other accessory buildings.
2 cities in DuPage County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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