St. Clair County, IL Home Business: Signage Rules (2026)

Home occupations are allowed only as a Special Accessory Use in the county's "A", "RR", "SR", and "SR-MH" zoning districts, and Zoning Ordinance Sec. 40-5-9(A) lists eleven conditions a home-based business must meet to keep that status. " In practice that means a home business cannot post a lit sign, a banner, a sandwich board, or any other exterior advertising; the single nameplate is the only exception, and it must still satisfy the county's general sign regulations in Article VII. Section 40-7-2(C) exempts identification signs, along with real estate signs under thirty-two square feet and government signs, from the sign permit that every other sign in the county needs, so the one-square-foot nameplate does not require a separate sign permit application.

The same subsection (A) bars any exterior storage of equipment or inoperative vehicles tied to the business (condition 6), caps the operation at forty percent of the dwelling or four hundred square feet of an accessory building (condition 3), and limits a household to one home occupation at a time (condition 4). Before any home occupation, sign included, can operate, the owner needs a permit granted only after a hearing before the Zoning Board of Appeals under subsection (B), and the use must also conform with any recorded covenants on the property.