St. Louis Residential Building Permit Guide

St. Louis residential building permits are required for new structures, major alterations, decks, porches, accessory buildings, fences, pools, roof work, and structural repairs.

Permit takeaway

St. Louis says a residential building permit is required for structural changes, major alterations, new construction, accessory buildings over 50 square feet, porches, decks, retaining walls, basement or attic living-space conversions, and many roof or pool projects.

Zoning and placement

Historic districts, city landmarks, flood areas, encroachments, redevelopment areas, and special conditions can add approvals before a building permit is issued.

Building and trade review

Separate plumbing, mechanical, and electrical permits may also be required when those trades are part of the work.

Call before applying when

Call before applying if the work includes structural framing, a new accessory building, deck, porch, fence, pool, roof sheathing, basement or attic conversion, historic property, or floodplain location.

Documents to prepare

• Online or in-person building permit application
• Project address
• Construction plans if required
• Historic or flood information if applicable
• Trade permit information if applicable

Inspection planning

• Apply through STL City Permits or the permit counter
• Resolve required reviews
• Obtain separate trade permits when needed
• Schedule inspections
• Keep final records

Official sources

• St. Louis Residential Permit Criteria
• St. Louis Apply for a Building Permit
• St. Louis Building Division Permits

This guide is a planning summary. Always verify the current requirements with the local office before starting work.