Room Addition Permit in St. Louis (2026)
Room Addition permit requirements, fees, and process for St. Louis, MO. Find out if you need a permit and how to apply.
Room Addition permit requirements in St. Louis, MO are conditional depending on project scope.
A Room Addition permit may be required depending on project scope in St. Louis, MO. The local building department handles permit applications for St. Louis. Below you will find the current thresholds, fees, and process for obtaining a room addition permit in St. Louis.
Permit Fees
Contact the local building department through their official website for current fee information.
How to Get a Room Addition Permit in St. Louis
Verify whether your project meets the permit threshold in St. Louis: contact the local building department to confirm if your project requires a permit.
Prepare your permit application and plans. Contact the local building department at their official website for required documentation.
Submit your application in person at the local building department.
St. Louis Building Division (Community Development Administration)
Frequently Asked Questions
Source: St. Louis Building Code — Room Addition Requirements. Last verified April 6, 2026. View source