ADU rules in Bolingbrook, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Bolingbrook does not currently permit accessory dwelling units (ADUs) as a by-right use in residential zones. The Village's zoning ordinance (Chapter 54) does not include ADU provisions. Illinois HB 2373 (2024) encourages ADU development statewide, but Bolingbrook has not adopted local ADU regulations. Contact Village Planning for current guidance.
Bolingbrook's zoning code permits accessory dwelling units (ADUs) in single-family residential zones. ADUs may be attached (converted garage, addition) or detached structures. Size is typically limited to 800-1,200 square feet or 50% of the primary dwelling's floor area, whichever is less. Setback requirements match those for accessory structures (typically 5 feet from side and rear property lines). Owner occupancy of either the primary or accessory unit may be required. ADUs must meet current building code, include independent kitchen and bathroom facilities, and comply with county utility connection requirements. Illinois state legislation may further shape local ADU rules.
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.
Bolingbrook, IL
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