Accessory Structures in Evanston, IL: What Residents Actually Need to Know

If you live in Evanston or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Evanston has 5 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

Carport Rules

Carports in Evanston require a building permit and must comply with accessory structure setback and lot coverage requirements. Carports are treated as accessory structures under the zoning ordinance. Front yard carports are generally prohibited in residential districts. Materials and design must be compatible with the principal structure.

Key details: Permit Required: Yes — building permit. Front Yard: Generally prohibited. Side Setback: Typically 3 feet. Lot Coverage: Counts toward maximum. Historic Districts: HPC review required.

Building a carport without a permit is a building code violation with fines of $75-$500 per day. Carports that exceed lot coverage or violate setbacks may be ordered modified or removed. In historic districts, unauthorized construction may result in additional penalties and required restoration. Deteriorated carports are subject to property maintenance citations.

Tiny Homes

Tiny homes face significant zoning barriers in Evanston. The city's zoning ordinance establishes minimum dwelling unit sizes that most tiny homes do not meet. Tiny homes on wheels are classified as recreational vehicles and cannot serve as primary residences. Tiny homes on permanent foundations must meet all building code requirements for conventional dwellings.

Key details: Tiny Home Zoning: No specific classification. THOWs: Classified as RVs, no habitation. Minimum Size: Must meet zoning district minimums. ADU Alternative: May be possible on qualifying lots. Community Dev: (847) 448-4311.

Using a tiny home on wheels as a permanent residence violates zoning and building codes. Living in an RV on residential property is subject to fines of $75-$500 per day. Building a tiny home without permits violates the building code. Structures that do not meet minimum dwelling unit standards cannot receive a certificate of occupancy.

Compared to other cities, Evanston takes a harder line on tiny homes. The enforcement and penalty structure reflects that.

Shed Rules

Evanston requires building permits for storage sheds exceeding a certain size threshold. All sheds must comply with zoning setback requirements and lot coverage limits. Smaller sheds may be exempt from building permits but still must meet zoning standards.

Key details: Permit Threshold: Required over 100 sq ft. Setback: Typically 3 feet from property lines. Location: Rear yard only. Height Limit: 15 feet maximum. Habitation: Not permitted.

Building a shed without a required permit is a code violation. The city may issue stop-work orders and require retroactive permitting. Sheds that violate setbacks or lot coverage must be relocated or removed.

Garage Conversions

Evanston allows garage conversions to living space subject to building permits and zoning compliance. Converting a garage may require providing replacement off-street parking depending on the zoning district requirements.

Key details: Permit Required: Yes, building permit. Parking Replacement: May be required by zoning. Building Code: Must meet habitable space standards. Energy Code: Compliance required. Contact: Community Dev (847) 448-4311.

Converting a garage without permits is a code violation subject to fines starting at $250 per day. Unpermitted conversions may need to be reversed or brought into compliance through retroactive permitting and inspections.

ADU Rules

Evanston permits accessory dwelling units in certain residential zoning districts. ADUs may be created through coach house construction, garage conversions, or additions to existing structures, subject to zoning approval and building permits.

Key details: ADUs Permitted: Yes, in certain residential districts. Types: Coach house, conversion, or addition. Size Limit: Typically 750-800 sq ft max. Parking: May require one off-street space. Contact: Community Dev (847) 448-4311.

Constructing or occupying an ADU without proper zoning approval and building permits is a code violation. Fines for unpermitted construction start at $250 per day. The city may require removal of non-compliant ADUs.

The Bottom Line

Evanston'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 Evanston is broadly strict or permissive.

All of the above reflects Evanston'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.