Accessory Structures in Des Plaines, IL (2026)
5 verified accessory structures rules for Des Plaines, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Illinois has no statewide ADU mandate. Des Plaines zoning limits accessory structures to 225 sq ft for non-garage structures. ADU approval requires zoning review.
Des Plaines Accessory Dwelling Unit (ADU) Rules
Some RestrictionsShed Rules
Accessory structures (sheds) in Des Plaines are limited to 225 sq ft. Two accessory structures maximum per lot. No more than one garage or carport. Building permit required.
Des Plaines Shed & Accessory Structure Rules
Some RestrictionsGarage Conversions
Des Plaines City Code Section 12-8-1 caps detached garages and carports at 720 square feet in floor area and 15 feet in maximum height for residential lots. A building permit is required from the Department of Community and Economic Development before construction, and Cook County electrical inspection rules apply to any wiring.
Building a Garage in Des Plaines, IL — Size & Permit Rules
Some RestrictionsCarport Rules
Carports in Des Plaines are treated as accessory structures and require a building permit. They must meet zoning setbacks, height limits, and lot coverage limits applicable to accessory structures in the underlying residential district. Detached carports in front yards are generally prohibited.
Des Plaines Carport Rules
Some RestrictionsTiny Homes
Des Plaines does not have specific tiny home zoning. Tiny homes on foundations must meet the same minimum dwelling size, setback, and building code requirements as any single-family house. Tiny homes on wheels are treated as recreational vehicles and may not be used as permanent residences in residential zones.
Des Plaines Tiny Home Rules
Heavy RestrictionsLooking for Cook County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Des Plaines city rules.
Accessory Structures in Cook County →