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.
Because Springfield does not have a dedicated ADU chapter in its Code of Ordinances, there is no across-the-board rule allowing or restricting rental of an accessory second unit. Where such a unit is approved, the Planning and Zoning Commission and City Council may impose conditions through the Special Use Permit ordinance: long-term-only rental, prohibition of short-term rental, owner-occupancy, parking, and recorded deed restrictions. Applicants should expect any short-term-rental component to draw scrutiny because Springfield's broader STR landscape lacks a dedicated registration ordinance (operators are governed by general business license, zoning, and the Illinois Hotel Operators' Occupation Tax, 35 ILCS 145). Stays of 29 nights or fewer to the same occupant are subject to the state HOOT and to platform-collection rules under IDOR Bulletin FY 2025-28 effective July 1, 2025. Stays of 30 consecutive nights or more are residential tenancies under the Illinois Residential Tenant and Landlord Act and are not subject to HOOT.
Violating an SUP rental condition - including a short-term-rental prohibition - is enforceable under Springfield Zoning Code Chapter 155 and under the recorded deed restriction. Penalties include administrative fines, permit revocation, and potential conversion order. Operators of unregistered short-term rentals also expose themselves to Illinois Department of Revenue HOOT back-tax assessment plus penalties and interest under 35 ILCS 145.
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