Garage / Carport Permit Requirements in St. Louis, MO
Independent city (not part of St. Louis County). Uses 2018 IRC with local amendments. Requires licensed contractors for most work.
When you DON'T need a permit
Small detached garage/carport structures (120 sq ft or less) may be treated as exempt accessory structures in St. Louis, MO.
Source: St. Louis City Revised Code / 2018 IRC with local amendments
When you DO need a permit
Detached garages over 120 sq ft require a building permit in St. Louis, MO.
Estimated fee: $300 – $1,300
Typical timeline: About 2 weeks
Source: St. Louis City Revised Code / 2018 IRC with local amendments
Attached garages require a building permit in St. Louis, MO. Fire separation from dwelling and structural plans are required.
Estimated fee: $350 – $1,500
Typical timeline: About 3 weeks
Source: St. Louis City Revised Code / 2018 IRC with local amendments
Carports require a building permit in St. Louis, MO. Carports are considered new structures and must comply with zoning setbacks.
Estimated fee: $210 – $900
Typical timeline: About 2 weeks
Source: St. Louis City Revised Code / 2018 IRC with local amendments
Converting a garage to living space requires multiple permits in St. Louis, MO.
Estimated fee: $265 – $1,125
Typical timeline: About 3 weeks
Source: St. Louis City Revised Code / 2018 IRC with local amendments
Detached garages and carports may require zoning approval for setback and lot coverage compliance. Garage conversions to living space may trigger zoning occupancy requirements.
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Frequently Asked Questions
Estimated permit fees for Garage / Carport projects in St. Louis, MO range from $300 – $1,300. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Garage / Carport projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in St. Louis can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Garage / Carport permits in St. Louis is About 2 weeks. More complex projects may take longer if plan review is required.
Learn More About Garage / Carport Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Garage / Carport Guide →