ADU rules in Naperville, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Naperville regulates accessory structures under Title 6, Section 6-2-10 (Zoning). Accessory dwelling units are subject to zoning district restrictions including lot coverage, height, and setback requirements. Building permits are required for all accessory structures.
Naperville Municipal Code Title 6, Section 6-2-10 governs accessory buildings, structures, and uses of land. ADUs and accessory structures must comply with lot coverage maximums, height limits, and setback requirements for the applicable zoning district. The R2 district requires a 25-foot rear yard setback, with allowances for patios, decks, and porches to extend up to 10 feet into the required rear yard setback. All accessory structures require building permits. The structure must remain subordinate to the principal dwelling. Illinois does not have a statewide ADU mandate like California, so Naperville retains local zoning authority over accessory dwelling units. Conditional use permits may be required depending on the zoning district and proposed use.
Building without a permit: stop-work order and fines. Exceeding lot coverage or violating setbacks: zoning violation requiring correction. Unauthorized dwelling use in accessory structure: zoning enforcement.
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