Bolingbrook's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Bolingbrook, Illinois, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Carport Rules

Bolingbrook regulates detached carports as accessory structures under Chapter 54 (Zoning), Article III (Accessory Structures and Uses), with primary placement and yard rules in Section 54-225. A detached accessory structure must be located behind the front wall setback of the principal residence, may not be placed in a corner side yard or on a vacant lot, must sit at least 5 feet from any rear or side lot line and at least 10 feet from the residence, and must respect Bolingbrook's R-2 30 percent and R-3 35 percent total lot-coverage caps.

Key details: Zoning Article: Ch. 54 Art. III. Key Section: Sec. 54-225. Min Lot-Line Setback: 5 feet. Min From Residence: 10 feet. Lot Coverage Cap: R-2 30% / R-3 35%.

Building a carport without a Building Division permit, placing it in a front yard or corner side yard, encroaching within 5 feet of a rear or side lot line, sitting closer than 10 feet to the residence, or pushing total lot coverage over the R-2 30 percent or R-3 35 percent cap violates Chapter 54 Article III. The Village Building Division and Planning and Zoning Division can issue stop-work orders and code-violation notices, require removal or after-the-fact permitting, and pursue penalties under the Code of Ordinances general penalty section, with each day of violation a separate offense.

Garage Conversions

Garage conversions in Bolingbrook require building permits and must comply with Chapter 54 Zoning requirements. Converted garages must maintain required off-street parking per Article VII of the zoning ordinance. Illinois has no state-mandated garage-to-ADU conversion allowance. Contact the Building Division for permit requirements.

Key details: Permit: Required — Building Division. Parking: Must maintain required off-street parking (Ch. 54, Art. VII). State Law: No IL mandate for garage-to-ADU conversions. Contact: Building Division at bolingbrook.gov.

Unpermitted garage conversions face fines of $500–$2,000, mandatory permit acquisition (double fees), and may need to be restored to garage use if code requirements cannot be met.

ADU Rules

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 has no statewide ADU mandate, so local zoning controls. Contact Village Planning for current guidance.

Key details: ADU Status: Not permitted under current zoning. State Law: No statewide ADU mandate. Code: Ch. 54 Zoning — no ADU provisions. Contact: Village Planning Division.

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.

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

Shed Rules

Sheds and accessory structures in Bolingbrook require building permits per the Village Building Division. Structures must comply with Chapter 54 Zoning setback and size requirements. Permits must be obtained prior to the start of any work. Contact the Building Division or submit applications through the online permits portal.

Key details: Permit: Required before any work begins. Code: Ch. 54 Zoning — setback and size rules. Online Permits: Available at bolingbrook.gov. Contact: Building Division.

Unpermitted structures receive a notice to either obtain a retroactive permit (with double fees) or remove the structure within 60 days. Fines of $100–$500 apply for non-compliance.

The Bottom Line

Bolingbrook's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Bolingbrook is broadly strict or permissive.

These rules come from Bolingbrook's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.