Land Use & Zoning

What is an 'accessory structure' in Illinois zoning and what regulations typically apply?

AA structure that must match the main building's exterior; no size limits apply
BA secondary structure subordinate to the principal use, such as a garage or shed; subject to size, setback, and height restrictions✓ Correct
CA commercial structure attached to a residential property; requires special use permit
DAny structure added after the original building permit was issued

Explanation

An accessory structure is a secondary structure on a property that is subordinate to and associated with the principal use—such as a detached garage, shed, or pool house. Zoning ordinances typically regulate accessory structures' maximum size (often as a percentage of the principal building), setbacks from property lines, and height. Permits are usually required for accessory structures.

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