Expanding construction operations into Missouri requires a solid understanding of the state’s permitting process. Missouri does not enforce a statewide building code; instead, building permits are managed by local jurisdictions. This means requirements, fees, and timelines vary depending on whether you are working in St. Louis, Kansas City, Springfield, Columbia, or one of the many smaller municipalities and counties.
Learn about what requires a Missouri building permit, who issues them, costs, unique considerations, and the steps to secure approval.
Who issues building permits in Missouri?
Since there is no statewide enforcement, building permits are issued by local authorities having jurisdiction (AHJs).
- Cities and municipalities – Larger jurisdictions such as St. Louis, Kansas City, Columbia, and Springfield manage their own permitting offices.
- Counties – In unincorporated areas, county building departments handle permit review and issuance.
Always confirm whether your project is under a city or county’s jurisdiction.
When do you need a Missouri building permit?
Most new construction and major alterations require a building permit in Missouri.
Typical projects that require a permit include:
- New residential or commercial construction
- Structural additions, remodels, and tenant improvements
- Garages, sheds, and accessory dwelling units (ADUs)
- Decks, porches, and carports
- Roofing projects involving structural changes
- Electrical, plumbing, and mechanical work (trade permits often required separately)
- Demolition of existing structures
- Pools, retaining walls, and fences over a certain height
Cosmetic work such as painting, flooring replacement, and minor repairs usually does not require a permit. However, requirements vary widely by city or county.
Examples of permit requirements in major MO cities:
Missouri building permit requirements
Permit applications typically require:
- Completed application form
- Site plan with property lines and setbacks
- Construction drawings or stamped architectural/engineering plans (for commercial and multi-family projects)
- Contractor license or registration with the jurisdiction
- Trade permits (plumbing, electrical, mechanical) submitted separately or as part of the package
- Zoning approval or compliance checks
- Energy code compliance documentation (if required locally—Missouri has no statewide energy code)
Missouri building permit costs
Permit fees vary by jurisdiction and are usually based on project valuation, square footage, or flat fees.
- Kansas City: Uses valuation-based fees plus plan review and inspection charges.
- St. Louis City: Fees calculated on estimated construction cost, with additional fees for trade permits.
- Smaller jurisdictions: May use flat fees for small residential projects (e.g., $50–$150 for a deck or shed).
Check the jurisdiction’s published fee schedule for the most accurate pricing.
Unique considerations when permitting in Missouri
Energy codes vary
Some jurisdictions, like Kansas City and St. Louis, enforce the IECC, while others may not have energy code requirements at all.
Stormwater and floodplain permits
Projects near rivers or in flood-prone areas may require additional approvals from county stormwater divisions or the Missouri Department of Natural Resources (DNR).
Historical preservation requirements
In cities like St. Louis and Kansas City, projects in historic districts may need additional design review or preservation board approval.
How to get a building permit in Missouri
The process differs across jurisdictions but generally follows these steps:
- Determine jurisdiction – Identify whether the project is within a city or unincorporated county.
- Prepare documentation – Gather drawings, site plans, contractor licenses, and trade permit applications.
- Submit application – Apply online or in person with the building department.
- Zoning review – Officials check setbacks, land use, and district compliance.
- Plan review – Building officials review compliance with IBC/IRC and local amendments.
- Pay permit fees – Based on valuation, square footage, or flat-rate schedules.
- Receive permit – Once approved, permits must be displayed on-site.
- Schedule inspections – For foundation, framing, electrical, plumbing, mechanical, and final approval.
