County Building Permits
St Charles County, MO - 2026 Building Permit Guide
How to apply for a building permit in unincorporated St Charles County, Missouri. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Applies to unincorporated St. Charles County and, where intergovernmental agreements exist, some contracted code services; floodplain review is separately routed through Planning and Zoning
- Department
- St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items
- Address
- 201 N. Second St., Suite 410, St. Charles, MO 63301
- Phone
- 636-949-7345
- bce@sccmo.org , planning@sccmo.org
Online Permit Portal
Platform: Citizenserve Citizen Access Portal • Account required: Yes • Submission: In-person only
Additional resources:
Application Process
- Confirm whether the parcel is in unincorporated county and whether floodplain, zoning, land disturbance, or other companion approvals are needed
- Prepare permit application, construction documents, contractor details, and any valuation or site information required by the County
- Submit through the County Citizenserve portal or at Community Development
- County staff reviews for code, zoning, and floodplain issues; corrections are issued if incomplete
- Pay permit fees after approval
- Permit is issued and inspections are scheduled with Building and Code Enforcement
Typical processing time: Not posted on the main permit page; floodplain-only permits issued without a building permit remain effective for 2 years
General Requirements
Building, trade, and related construction work in unincorporated county; floodplain permits are required for practically all construction, improvements, demolition, or earthmoving in regulated flood zones, even when a building permit would not otherwise be required
Required Documents
- When a permit is required: Building, trade, and related construction work in unincorporated county; floodplain permits are required for practically all construction, improvements, demolition, or earthmoving in regulated flood zones, even when a building permit would not otherwise be required
- Required documents: Permit application, plans/specifications, site information, contractor data, valuation, and for floodplain work elevation certificate and other supporting technical documents as applicable
- Permit validity/expiration: Floodplain development permits not issued with a building permit are valid for 2 years; building permit expiration was not clearly posted on the public overview page
- Owner-builder rules if available: Not clearly posted on the overview pages reviewed
- Contractor license requirements: County pages direct contractor information through Building and Code Enforcement; specific public-facing contractor licensing rules were not clearly posted on the overview pages reviewed
- Building code adopted: County states it has adopted the 2021 International Building Code; related adopted codes are administered through Building and Code Enforcement
- Permit validity
- Floodplain development permits not issued with a building permit are valid for 2 years; building permit expiration was not clearly posted on the public overview page
- Building code
- County states it has adopted the 2021 International Building Code; related adopted codes are administered through Building and Code Enforcement
- Owner-builder
- Not clearly posted on the overview pages reviewed
- Contractor requirements
- County pages direct contractor information through Building and Code Enforcement; specific public-facing contractor licensing rules were not clearly posted on the overview pages reviewed
Fees
- Minimum permit fee
- Not clearly stated on the overview pages reviewed
- Plan check fee
- Not clearly stated on the overview pages reviewed
- Permit fee formula
- County code applies fee schedule by ordinance; floodplain permit fee is set in Unified Development Ordinance Section 425.020.D
- Reinspection fee
- Not clearly stated on the overview pages reviewed
- Payment note
- Complete applications must include fee payment before processing/issuance
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
Contact the St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
- Through Building and Code Enforcement after permit issuance; specific online or phone scheduling steps were not clearly posted on the overview pages reviewed ()
- Inspection hours
- Not clearly posted
Typical inspection sequence: Foundation/slab, framing and rough trade inspections, then finals, depending on project scope
Additional Resources
- Building code: County states it has adopted the 2021 International Building Code; related adopted codes are administered through Building and Code Enforcement
- Zoning information: View zoning info
- sccmo.org
- sccmo.org
- License lookup guide: Missouri Contractor License Requirements
- Contract template: Missouri Homeowner-Contractor Agreement
- Missouri hub: Missouri Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items before applying.
Frequently Asked Questions
St Charles County Building Permit FAQ
- Do I need a building permit in unincorporated St Charles County, MO?
- Building, trade, and related construction work in unincorporated county; floodplain permits are required for practically all construction, improvements, demolition, or earthmoving in regulated flood zones, even when a building permit would not otherwise be required
- How much does a building permit cost in unincorporated St Charles County, MO?
- The minimum permit fee is Not clearly stated on the overview pages reviewed. Fees are calculated as: County code applies fee schedule by ordinance; floodplain permit fee is set in Unified Development Ordinance Section 425.020.D. Plan check fee: Not clearly stated on the overview pages reviewed.
- How do I apply for a building permit in unincorporated St Charles County, MO?
- 1. Confirm whether the parcel is in unincorporated county and whether floodplain, zoning, land disturbance, or other companion approvals are needed 2. Prepare permit application, construction documents, contractor details, and any valuation or site information required by the County 3. Submit through the County Citizenserve portal or at Community Development 4. County staff reviews for code, zoning, and floodplain issues; corrections are issued if incomplete 5. Pay permit fees after approval 6. Permit is issued and inspections are scheduled with Building and Code Enforcement
- How long does it take to get a building permit in unincorporated St Charles County, MO?
- Typical processing time is Not posted on the main permit page; floodplain-only permits issued without a building permit remain effective for 2 years.
- What work is exempt from building permits in unincorporated St Charles County, MO?
- The following work is generally exempt: No consolidated public exemption list was located on the County overview pages reviewed; Floodplain permits are required for many small items in regulated flood zones including fences, driveways, reroofing, windows, and sidewalks.
- How do I schedule a building inspection in unincorporated St Charles County, MO?
- Inspections can be scheduled via: Through Building and Code Enforcement after permit issuance; specific online or phone scheduling steps were not clearly posted on the overview pages reviewed.
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