ADU rules in Fairview Heights, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
St. Clair County's Zoning Ordinance does not authorize a standalone accessory dwelling unit. Residential districts allow only one detached one-family dwelling; caretaker accommodations are permitted but not as a separate detached second home. Incorporated cities set their own ADU rules.
In unincorporated areas the county Zoning Ordinance (Chapter 40) governs. Permitted accessory uses in single-residence districts include "Accommodations for professional servants, caretakers, watchmen, or custodians, but not as a separate detached one-family dwelling" (Sec. 40-4-13). Districts are capped at one dwelling unit per the minimum-lot standard in the Area/Bulk Schedule (Sec. 40-3-7), so a second independent dwelling is not an as-of-right accessory use. Inside Belleville, O'Fallon, Fairview Heights, East St. Louis and other municipalities, city zoning controls. Illinois counties zone unincorporated land under 55 ILCS 5/5-12001.
Zoning violations are enforced by the Building & Zoning Department; unpermitted dwellings can be ordered removed and fined per the county code penalty provisions.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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