On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for St. Clair
All residential, commercial, or industrial projects must be reported to the Building Department. Work affecting structural supports, creating a new structure, or involving decks, porches, garages, carports, and above- or below-ground swimming pools requires a valid building permit before work begins.
Storage or utility sheds 200 square feet or less
- Exempt Storage or utility sheds 200 square feet or less
Required documents
- Application form
- For new single- and two-family homes: two full sets of scale drawings, plat plan, site plan, and truss drawings
- For multifamily, commercial, and industrial: sealed construction documents
- Building code
- City code references current editions; confirm directly with the city.
- Owner-builder
- Property owners are responsible, along with builders, for ensuring permit requirements are met.
- Contractor requirements
- All contractors must obtain a current St. Clair business license before work commences. Proof of general liability insurance, workers compensation insurance, and a $50 yearly business license fee are required.
§ 03
Application process
Application → plan check → issuance → inspection → final
- 01 Review the permit matrix page and choose the correct application, including residential, commercial, deck, fence, pool, roof, HVAC, electrical, demolition, sign, or excavation.
- 02 Ensure all contractors hold a current St. Clair business license before work starts.
- 03 Submit the required application package. For new one- and two-family homes, St. Clair requires two full sets of scaled drawings, a plat plan, site plan, and truss drawings. Multifamily, commercial, and industrial construction documents must be sealed by a design professional.
- 04 For multifamily, commercial, and industrial projects, submit plans to the St. Clair Fire Protection District and obtain its separate permit.
- 05 Pay required fees before permit issuance, then schedule inspections with the city.
§ 04
Fee schedule
St. Clair building permit fees
Fee type
Amount
01
Plan check fee
Review fees apply for multifamily, commercial, and industrial projects; exact amounts not posted on the reviewed page.
02
Permit fee formula
New construction: gross area x construction cost x 0.0056. Residential alterations: gross area x construction cost x 0.25 x 0.0056.
All review fees are due before permit issuance; business licenses are paid separately through City Hall.
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- (636) 629-0333 (phone)
Typical sequence: City maintains a 'Required Permitted Inspection' page; detailed sequence was not fully captured in reviewed sources.
§ 06
Frequently asked
Common questions about St. Clair permits
01 Do I need a building permit in St. Clair, MO? ▸
All residential, commercial, or industrial projects must be reported to the Building Department. Work affecting structural supports, creating a new structure, or involving decks, porches, garages, carports, and above- or below-ground swimming pools requires a valid building permit before work begins.
02 How much does a building permit cost in St. Clair, MO? ▸
Building permit fees in St. Clair, MO are set by the local building department and vary by project type and valuation. Fees are calculated as: New construction: gross area x construction cost x 0.0056. Residential alterations: gross area x construction cost x 0.25 x 0.0056.. Plan check fee: Review fees apply for multifamily, commercial, and industrial projects; exact amounts not posted on the reviewed page..
03 How do I apply for a building permit in St. Clair, MO? ▸
To apply for a building permit in St. Clair, MO, follow these steps: 1. Review the permit matrix page and choose the correct application, including residential, commercial, deck, fence, pool, roof, HVAC, electrical, demolition, sign, or excavation. 2. Ensure all contractors hold a current St. Clair business license before work starts. 3. Submit the required application package. For new one- and two-family homes, St. Clair requires two full sets of scaled drawings, a plat plan, site plan, and truss drawings. Multifamily, commercial, and industrial construction documents must be sealed by a design professional. 4. For multifamily, commercial, and industrial projects, submit plans to the St. Clair Fire Protection District and obtain its separate permit. 5. Pay required fees before permit issuance, then schedule inspections with the city.
04 What work is exempt from building permits in St. Clair, MO? ▸
Not all construction work requires a permit in St. Clair, MO. The following work is generally exempt: Storage or utility sheds 200 square feet or less. When in doubt, confirm with the local building department before starting work.
05 How do I schedule a building inspection in St. Clair, MO? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in St. Clair, MO via: (636) 629-0333.
last verified April 2026
source City of St. Clair Building Department ↗
entry id permits/missouri/franklin/st-clair
Educational reference. Permit rules and fees change — confirm current requirements directly with City of St. Clair Building Department before applying. Jaspector is not legal advice.