Building Permit Information
In an effort to ensure the safety of the citizens of St. Charles County, as well as staff members of the St. Charles County Building and Code Enforcement Division, we are encouraging permit applicants to delay inspection requests for occupied structures until the current COVID-19 state of emergency has passed. Permit expiration dates will be automatically extended to May 1, 2020.
St. Charles County adopted the 2015 International Building Codes with amendments, which went into effect on Monday, August 14, 2017. Due to copyright laws we cannot publish the code on this website. You may go to the International Code Council website for information to purchase a copy.
When Is a Building Construction Permit Required?
A building permit is required to:
- Build, add-on, alter, or repair a structure
- Change the use of a building or structure
- Install new plumbing, electrical, or mechanical equipment
- Relocate plumbing, electrical, or mechanical equipment
- Demolish a structure or part of a structure
Generally, projects that do require permits include:
- Any work done within the 100-year floodplain
- All new construction of residential and commercial structures
- Sheds greater than 120 square feet in size
- Finishing a basement
- Any electrical re-wiring or plumbing changes made in a home or addition
- Changes in building use, such as changing a residence to a business office
- Changes in electrical service or service upgrade
- Fences over six feet in height
- Installation of in-ground or above-ground swimming pools or hot tubs
- Installation of lawn sprinklers
- Moving a mobile home into a mobile home park or onto private property
- Replacing an air conditioning and/or heating unit
- Replacing a water heater
- Installing a retaining wall over 4 feet high
- Installing an all new septic system
- Major repairs or alterations to existing septic systems
- Replacement or repair of sewer laterals or water service
Generally, projects that do not require permits include:
- New floor coverings
- Painting, wallpapering and plastering
- Pumping a septic tank
- Repairing drywall
- Replacing existing windows (providing the opening size is not changed)
- Replacing a light fixture or faucet
- Replacing a roof
- Replacing the siding of a home
- Utility sheds less than or equal to 120 square feet without electric. There are requirements for the placement of the shed. Contact the Planning and Zoning Division at 636-949-7335 for the setbacks.
There are many more types of projects other than those listed above, some of which may or may not require building permits. If you have any questions, please contact the St. Charles County Building and Code Enforcement Division at 636-949-7345 if you have any questions.