Tiny home rules in O'Fallon, IL — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
St. Clair County has no tiny-home ordinance. A permanent tiny house is a dwelling that must meet minimum-lot standards, the adopted building code and dwelling requirements. Temporary structures used as living quarters are barred except during construction. Cities set their own rules.
The county Zoning Ordinance treats a dwelling as one detached one-family home per lot under the minimum-lot standards of the Area/Bulk Schedule (Sec. 40-3-7), and the Building Code (Ch. 7) adopts the 2012 International Building Code, so a permanent tiny house must be permitted and code-compliant. Temporary or movable structures used for living are restricted: temporary construction sheds and buildings are allowed only for the duration of construction, not beyond one year (Sec. 40-4-13). There is no county provision authorizing tiny homes on wheels as permanent residences. Inside municipalities, city zoning controls.
Occupying a non-compliant or temporary structure as a dwelling is a code violation subject to abatement orders and penalties.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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