ADU rules in Peoria County, IL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Illinois has no statewide ADU mandate, so whether you can add a second dwelling is set by local zoning. Peoria County and the City of Peoria review accessory dwelling units under their own zoning codes and require a building permit.
Contrary to a common claim, Illinois has not enacted a statewide ADU law; bills to require municipalities to allow accessory dwelling units have been introduced but never passed, and HB 2373 concerns criminal-record sealing, not ADUs. So a second dwelling in the Peoria area is governed by local zoning. In unincorporated Peoria County, a second dwelling or a converted accessory building needs zoning approval under the Chapter 20 Unified Development Ordinance and a building permit. Inside the home-rule City of Peoria, the Unified Development Code and the zoning district decide whether an accessory dwelling is a permitted use. Any habitable unit must meet the adopted building and energy codes, and HOAs may add restrictions.
Occupying an accessory dwelling built without a permit is a code violation. The county or city can require the unit legalized to building-code standards or removed, and utility service may be withheld.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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