Home Business in St. Charles County, MO (2026)
4 rules for unincorporated St. Charles County, Missouri.
Verified from official government sources
Zoning & Home Occupation Permits
St. Charles County lets residents run one home occupation per household in any residential zoning district, but caps it at 25% of the home's floor area, 500 square feet, and two customers at a time.
St. Charles County Home Occupation Rules
Some RestrictionsSt. Charles County Code § 405.495(A)(1)-(3)
Only one (1) occupation or profession shall be permitted per resident residing at the premises. No more than two (2) customers or clients may be served in a residence at one (1) time, except in the case of photography studios, where the number of customers shall not exceed ten (10). The occupational use may occupy not more than twenty-five percent (25%) of the total floor area of the primary re...
Signage Rules
A home-based business in unincorporated St. Charles County may advertise itself with only a small, unlit sign attached to the house. Section 405.495(A)(4) ties home-occupation signage back to § 405.480(A)(2), which caps the sign at two square feet, bars illumination, and limits its wording to the occupant's name and occupation or business name.
St. Charles County Home Business Sign Rule
Significant RestrictionsSt. Charles County Code §§ 405.495(A)(4), 405.480(A)(2)
Section 405.495(A) 4. Signage for home occupations shall be in conformance with Section 405.480. ... Section 405.480(A) Permanent (the sign must be attached to a structure). 2. Non-illuminated signs for home occupations indicating only the name of the persons and their occupation or their business name, not to exceed two (2) square feet.
Customer Traffic Restrictions
St. Charles County limits how many customers a home-based business can host at once. Code § 405.495(A)(2) caps in-home client visits at two people at a time, with a special carve-out to ten for photography studios, as part of a broader package of standards every home occupation in the unincorporated county must satisfy.
St. Charles County Home Business Client Limits
Some RestrictionsSt. Charles County Code § 405.495(A)(2)
A. Standards For The Operation Of A Home Occupation. 1. Only one (1) occupation or profession shall be permitted per resident residing at the premises. 2. No more than two (2) customers or clients may be served in a residence at one (1) time, except in the case of photography studios, where the number of customers shall not exceed ten (10).
Home Daycare
Running a preschool or daycare in unincorporated St. Charles County's single-family districts needs a conditional use permit, not a simple business license. County code lists "Preschool, daycare, special, or other private school" as a conditional use under Section 405.090(C)(12), while a facility caring for four or fewer children besides the operator's own escapes the zoning code's "daycare center" definition entirely.
St. Charles County Home Daycare Zoning Rules
Significant RestrictionsSt. Charles County Code § 405.060 (Definitions); § 405.090(C)(12) (Conditional Uses); Building Code of St. Charles County § 305.2.3
C. Conditional Uses. ... 12. Preschool, daycare, special, or other private school. [Section 405.060, Definitions] DAYCARE CENTER A building used for the supervision and care of more than four (4) preschool children, other than those of the operator. [Building Code § 305.2.3] Eight (8) or fewer children in a dwelling unit. A facility such as the above within a dwelling unit and having eight (8) ...
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