On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for St Charles County
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
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
- Exempt No consolidated public exemption list was located on the County overview pages reviewed
- Exempt Floodplain permits are required for many small items in regulated flood zones including fences, driveways, reroofing, windows, and sidewalks
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
- Building code
- 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
- 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
§ 03
Application process
Typical processing: Not posted on the main permit page; floodplain-only permits issued without a building permit remain effective for 2 years
- 01 Confirm whether the parcel is in unincorporated county and whether floodplain, zoning, land disturbance, or other companion approvals are needed
- 02 Prepare permit application, construction documents, contractor details, and any valuation or site information required by the County
- 03 Submit through the County Citizenserve portal or at Community Development
- 04 County staff reviews for code, zoning, and floodplain issues; corrections are issued if incomplete
- 05 Pay permit fees after approval
- 06 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
§ 04
Fee schedule
St Charles County building permit fees
Fee type
Amount
01
Minimum permit fee
Not clearly stated on the overview pages reviewed
02
Plan check fee
Not clearly stated on the overview pages reviewed
03
Permit fee formula
County code applies fee schedule by ordinance; floodplain permit fee is set in Unified Development Ordinance Section 425.020.D
04
Reinspection fee
Not clearly stated on the overview pages reviewed
Complete applications must include fee payment before processing/issuance
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
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 sequence: Foundation/slab, framing and rough trade inspections, then finals, depending on project scope
§ 06
Frequently asked
Common questions about unincorporated St Charles County permits
01 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
02 How much does a building permit cost in unincorporated St Charles County, MO? ▸
Building permit fees in unincorporated St Charles County, MO are set by the local building department and vary by project type and valuation. 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.
03 How do I apply for a building permit in unincorporated St Charles County, MO? ▸
To apply for a building permit in unincorporated St Charles County, MO, follow these steps: 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
04 How long does it take to get a building permit in unincorporated St Charles County, MO? ▸
Building permit processing times in unincorporated St Charles County, MO typically run Not posted on the main permit page; floodplain-only permits issued without a building permit remain effective for 2 years. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in unincorporated St Charles County, MO? ▸
Not all construction work requires a permit 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. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in unincorporated St Charles County, MO? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated St Charles County, MO via: Through Building and Code Enforcement after permit issuance; specific online or phone scheduling steps were not clearly posted on the overview pages reviewed.
last verified April 2026
source St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items ↗
entry id permits/missouri/st-charles/unincorporated
Educational reference. Permit rules and fees change — confirm current requirements directly with St. Charles County Community Development Department, Building and Code Enforcement Division; Planning and Zoning Division for floodplain and land development items before applying. Jaspector is not legal advice.