Accessory Structures in Springfield, IL (2026)
9 verified accessory structures rules for Springfield, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Springfield regulates accessory dwelling units through zoning. Illinois passed ADU legislation (HB 2373, effective 2024) encouraging ADU development statewide.
Springfield ADU & Accessory Dwelling Rules
Some RestrictionsADU Permits
Springfield, IL does not have a stand-alone Accessory Dwelling Unit (ADU) ordinance in its Code of Ordinances. ADU-style second units are reviewed through the underlying zoning district's permitted-use list and may require a Special Use Permit from the Springfield Planning and Zoning Commission. No 60-day ministerial review window applies (Illinois has no state ADU preemption equivalent to California's).
Springfield IL ADU Permit Requirements
Some RestrictionsADU Impact Fees
Springfield, IL has no published ADU impact fee schedule because it does not have a dedicated ADU ordinance. Where a second dwelling is approved via Special Use Permit, standard building permit fees, plan review fees, and utility connection charges apply. Illinois has no statewide cap equivalent to California's §65852.2(f) 750-sq-ft impact fee exemption.
Springfield IL ADU Impact Fees
Some RestrictionsADU Owner Occupancy
Springfield, IL has no published owner-occupancy rule for ADU-style second units because it has no dedicated ADU ordinance. Owner-occupancy conditions, if any, are typically imposed case-by-case as conditions of a Special Use Permit by the Planning and Zoning Commission. Illinois has no statewide preemption banning such conditions (unlike California).
Springfield IL ADU Owner Occupancy Rules
Some RestrictionsADU Rental Restrictions
Springfield, IL has no published ADU-specific rental restriction because it has no dedicated ADU ordinance. Restrictions on rental of a second dwelling are typically imposed case-by-case as conditions of a Special Use Permit. Stays of 29 nights or fewer remain subject to the Illinois Hotel Operators' Occupation Tax under 35 ILCS 145.
Springfield IL ADU Rental Restrictions
Some RestrictionsShed Rules
Springfield allows small sheds without permits, typically under 120 to 200 sq ft. Larger structures need building permits. Setback requirements apply.
Springfield Shed & Outbuilding Rules
Few RestrictionsGarage Conversions
Springfield may allow garage conversions with building permits. Replacement parking typically required. Illinois HB 2373 may ease some restrictions.
Springfield Garage Conversion Rules
Some RestrictionsCarport Rules
Springfield requires permits for carport construction. Setback requirements, height limits, and lot coverage maximums apply.
Springfield Carport Construction Rules
Some RestrictionsTiny Homes
Springfield regulates tiny homes differently based on whether they are on a permanent foundation or on wheels. Zoning and minimum square footage requirements apply.
Springfield Tiny Home & Small Dwelling Rules
Some RestrictionsLooking for Sangamon County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Springfield city rules.
Accessory Structures in Sangamon County →