St. Louis City is an independent city and functions as both a city and a county, meaning it operates its own unified permitting system for all properties within its borders. There are no separate municipal permit jurisdictions within the city limits, and all development must comply with city-specific zoning and building ordinances.
How this fits with the state
The state authority here is Missouri local building departments; state trade boards where applicable. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.