Peoria's Accessory Structures: The Rules That Matter

Every city handles accessory structures a little differently. In Peoria, Illinois, there are 5 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.

ADU Rules

Peoria's Appendix B (Zoning Ordinance) does not include 'accessory dwelling unit' as a defined use category. Single-family districts permit only one principal dwelling per lot; a second self-contained unit generally requires a parcel in a two-family or higher-density district or a variance/special use from the Zoning Board of Appeals. Illinois has no statewide ADU enabling statute, so all authority rests with the home-rule city under 65 ILCS 5/.

Key details: Code Authority: Appendix B Zoning Ordinance. ADU Status: Not a defined use. State Preemption: None (65 ILCS 5/). Variance Route: Zoning Board of Appeals. Home Rule: Yes (pop. 113,150).

Establishing a second dwelling unit on a single-family parcel without zoning approval is a violation of Appendix B (Zoning Ordinance) enforced by Code Enforcement. Typical consequences include a stop-work order, after-the-fact variance application (often denied), an order to discontinue the unauthorized use, and disconnection of utility service for the unpermitted unit. Construction without building permits triggers separate Chapter 5 (Buildings) penalties and may require exposure of concealed framing for inspection.

This is not one of those rules that cities tend to ignore. Peoria actively enforces its adu rules requirements.

ADU Impact Fees

Peoria does not levy general residential impact fees on new construction. Charges on a new dwelling unit are limited to building permit fees calculated on construction valuation, electrical/plumbing/mechanical trade permit fees, and water and sanitary sewer tap-on fees if a new service line is installed. School and park land/cash contributions under the Illinois Plat Act (765 ILCS 205/) apply only when a parcel is subdivided or platted, not on a permit for an existing platted lot.

Key details: General Impact Fee: None levied. Building Permit: Valuation-based fee. Water Provider: Illinois American Water. Sewer Provider: Greater Peoria Sanitary District. Plat Act: 765 ILCS 205/.

Failure to pay required building, electrical, plumbing, mechanical, or tap-on fees blocks issuance of the permit and any certificate of occupancy. Unpermitted construction triggers stop-work orders and after-the-fact permit fees often at doubled rates. Unpaid water and sewer charges become liens collectable on the Peoria County property tax bill. Avoidance of school/park land-cash on a subdivision is enforced by refusal to record the plat with the Peoria County Recorder.

Peoria is more permissive than most cities when it comes to adu impact fees. That said, there are still limits.

Shed Rules

Peoria requires an Accessory Structure Permit from the Building Safety Division (309-494-8600) for residential sheds, with thresholds and dimensional limits set by Appendix B (Zoning Ordinance). Sheds are typically restricted to rear or side yards, with setbacks from property lines, maximum height around 12-15 feet, and limits on combined accessory structure footprint. Sheds may not be used as habitable space or as a second dwelling unit.

Key details: Permit Type: Accessory Structure Permit. Permit Authority: Building Safety Division. Phone: (309) 494-8600. Yard Restriction: Side/rear typical. Habitable Use: Not allowed (ADU rule).

Installing a shed without a permit when one is required is a violation of Appendix B (Zoning Ordinance) and Chapter 5 (Buildings) of the Code of Ordinances. Code Enforcement may issue a stop-work order, require an after-the-fact permit (typically at increased fee), and order modification or removal of any non-conforming structure including those over the height, footprint, or setback limits. Sheds used as habitable space or as a second dwelling trigger the ADU enforcement framework with utility disconnection and use cessation orders.

Garage Conversions

Converting a Peoria garage into habitable living space requires a building permit from the Building Safety Division (309-494-8600) and zoning review under Appendix B (Zoning Ordinance). A conversion that creates a self-contained second dwelling (kitchen + bath + sleeping area) is restricted under the city's ADU rules — the same variance/special use route through the Zoning Board of Appeals applies. Off-street parking minimums must still be met after conversion.

Key details: Permit Required: Yes (Alteration + trades). Permit Authority: Building Safety (309-494-8600). Off-Street Parking: Must be replaced. ADU Rule: Variance/special use only. Smoke/CO Alarms: 425 ILCS 60; 430 ILCS 135.

Performing a garage conversion without permits is a violation of Chapter 5 (Buildings) and Appendix B (Zoning Ordinance). Building Safety can issue a stop-work order, require an after-the-fact permit (typically at increased fee), and require exposure of concealed framing, insulation, wiring, and plumbing for inspection. Conversions that create an unauthorized second dwelling are enforced under the ADU framework: order to discontinue the use, utility disconnection, and possible removal of kitchen plumbing. Failure to maintain required off-street parking is a separate zoning violation.

Compared to other cities, Peoria takes a harder line on garage conversions. The enforcement and penalty structure reflects that.

ADU Permits

Peoria does not have a streamlined ADU permit pathway. A second self-contained dwelling on a single-family parcel requires either (1) the parcel to be re-zoned to a two-family or multi-family district, or (2) a use variation or special use permit through the Zoning Board of Appeals. Once zoning approval is obtained, the standard Residential Building Permit and trade permits issue from the Building Safety Division (309-494-8600). Illinois has no statewide ADU enabling statute.

Key details: Streamlined ADU Path: None in Peoria. Zoning Route: Variance/special use. State ADU Statute: None in IL. Permit Authority: Building Safety (309-494-8600). Variance Forum: Zoning Board of Appeals.

Building a second dwelling unit without zoning approval and building permits is a serious violation of Chapter 5 and Appendix B of the Code of Ordinances. Code Enforcement can issue a stop-work order, require an after-the-fact application (often denied), order discontinuation of any unauthorized residential use, and refer the property for utility disconnection. Building Safety can require exposure of concealed framing, electrical, and plumbing work for inspection. Unauthorized rental of an unpermitted unit may also constitute violations of Peoria's rental registration framework.

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

The Bottom Line

Peoria is tougher than many cities when it comes to accessory structures. Out of the 5 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Peoria, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

All of the above reflects Peoria's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.