Accessory Structures in Highland Park, IL (2026)
4 verified accessory structures rules for Highland Park, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Highland Park does not appear to have a specific ADU ordinance. Accessory dwelling units may require zoning approval under Chapter 150. Illinois HB 2373 (2024) encourages ADU development statewide.
Highland Park ADU Rules & Accessory Dwelling Unit Regulations
Some RestrictionsShed Rules
Building permits required for sheds in Highland Park. The city publishes Shed Permit Requirements (v2.1). Applications must include property owner authorization and be submitted through the Civic Access Portal.
Highland Park Shed Rules & Outbuilding Regulations
Some RestrictionsGarage Conversions
Highland Park Code of Ordinances Chapter 150 (Zoning) limits detached garages in residential districts by lot coverage and accessory-structure square footage, with maximum size tied to a percentage of the rear yard or an absolute cap (typically around 1,000 sq ft, whichever is less). All work requires a building permit under Chapter 170 (Building Code), which adopts the 2018 International Building/Residential Codes.
Building a Garage in Highland Park, IL — Size & Permit Rules
Some RestrictionsCarport Rules
Highland Park regulates carports as accessory structures under Title XV, Chapter 150 of the Zoning Code (Article II Definitions and Article VII Area, Bulk and Density). Permitted accessory uses are governed by Article IV (Section 150.401 et seq.) and dimensional limits including residential lot development requirements appear in Section 150.703. A separate building permit is required from the Building Division under Chapter 170 (Building Code), which adopts the 2018 International Residential Code as locally amended.
Carport Rules in Highland Park
Some RestrictionsLooking for Lake County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Highland Park city rules.
Accessory Structures in Lake County →