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§ 02
When a permit is required
Permit triggers and exempt work for O'Fallon
New construction, additions, remodels, accessory structures, many trade permits, and other regulated work under city code
No consolidated public exemption list was located on the public pages reviewed
- Exempt No consolidated public exemption list was located on the public pages reviewed
Required documents
- When a permit is required: New construction, additions, remodels, accessory structures, many trade permits, and other regulated work under city code
- Required documents: Permit form, plans/specifications, site plan or plat information as applicable, contractor data, and project valuation
- Permit validity/expiration: Not clearly posted on the public pages reviewed
- Owner-builder rules if available: Not clearly posted on the public pages reviewed
- Contractor license requirements: City administers contractor licensing/registration tied to permit issuance
- Building code adopted: City enforces locally adopted construction codes; exact edition should be confirmed from city ordinance before application
- Building code
- City enforces locally adopted construction codes; exact edition should be confirmed from city ordinance before application
- Permit validity
- Not clearly posted on the public pages reviewed
- Owner-builder
- Not clearly posted on the public pages reviewed
- Contractor requirements
- City administers contractor licensing/registration tied to permit issuance
§ 03
Application process
Typical processing: Not clearly posted on the public pages reviewed
- 01 Verify permit type with Planning and Development and check for zoning, engineering, or right of way reviews
- 02 Prepare permit application, plans, and contractor information
- 03 Submit through the City permit process
- 04 City completes review and returns comments if revisions are required
- 05 Fees are paid after approval
- 06 Permit is issued and inspections are scheduled with the City
Typical processing time: Not clearly posted on the public pages reviewed
Source: City of O'Fallon Planning and Development Department ↗
§ 04
Fee schedule
O'Fallon building permit fees
Fee type
Amount
01
Minimum permit fee
Not clearly posted on the public pages reviewed
02
Plan check fee
Not clearly posted on the public pages reviewed
03
Permit fee formula
Mix of valuation-based and permit-type specific fees
04
Reinspection fee
Not clearly posted on the public pages reviewed
Paid through the City permit process
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- Through the City after permit issuance ()
- Inspection hours
- Not clearly posted
Typical sequence: Footing/foundation, rough framing and trades, then final inspections
§ 06
Frequently asked
Common questions about O'Fallon permits
01 Do I need a building permit in O'Fallon, MO? ▸
New construction, additions, remodels, accessory structures, many trade permits, and other regulated work under city code
02 How much does a building permit cost in O'Fallon, MO? ▸
Building permit fees in O'Fallon, MO are set by the local building department and vary by project type and valuation. The minimum permit fee is Not clearly posted on the public pages reviewed. Fees are calculated as: Mix of valuation-based and permit-type specific fees. Plan check fee: Not clearly posted on the public pages reviewed.
03 How do I apply for a building permit in O'Fallon, MO? ▸
To apply for a building permit in O'Fallon, MO, follow these steps: 1. Verify permit type with Planning and Development and check for zoning, engineering, or right of way reviews 2. Prepare permit application, plans, and contractor information 3. Submit through the City permit process 4. City completes review and returns comments if revisions are required 5. Fees are paid after approval 6. Permit is issued and inspections are scheduled with the City
04 How long does it take to get a building permit in O'Fallon, MO? ▸
Building permit processing times in O'Fallon, MO typically run Not clearly posted on the public pages reviewed. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in O'Fallon, MO? ▸
Not all construction work requires a permit in O'Fallon, MO. The following work is generally exempt: No consolidated public exemption list was located on the public pages reviewed. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in O'Fallon, MO? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in O'Fallon, MO via: Through the City after permit issuance.
last verified April 2026
source City of O'Fallon Planning and Development Department ↗
entry id permits/missouri/st-charles/o-fallon
Educational reference. Permit rules and fees change — confirm current requirements directly with City of O'Fallon Planning and Development Department before applying. Jaspector is not legal advice.