Building and Permits

The Building Division performs plan review and inspections on new residential and commercial properties. Residential permits are required for any new home, as well as for decks, sheds, pools, basement finishes, additions and major alterations. Residential rental occupancy permits are required before occupying the unit. Commercial permits are required for any new commercial project including alterations or additions. This division is also responsible for the planning and implementation of the City’s adopted building codes and ordinances.

Questions about permits? Check out our guide: Why do I need a permit? (PDF)

Apply for a permit      Account Login

The division is located on the second floor of O'Fallon Municipal Centre (City Hall), 100 North Main Street. Hours of operation are Monday through Friday, 8 a.m. – 5 p.m.

Scheduling an inspection can be completed by logging into the CitizenServe portal using the button above. Inspections scheduled using the portal are typically completed the next day. Rental occupancy inspections may require two (2) day’s notice prior to an inspection being conducted depending on when the request is received. Questions may be directed to 636-379-5660.

Current Codes and Adoptive Ordinances

• Access O'Fallon's ICC Codes – View and use O'Fallon's ICC Codes, with ordinance changes included, for free.

Other resources

• City of O'Fallon Permit Fee Schedule (PDF)
• Open in the "O" brochure (PDF) – A guide to opening a business in O'Fallon

Fire Districts

Please note:  The City of O'Fallon is served by multiple independent fire districts that are separate governmental entities and do not fall under the authority of the City of O'Fallon. These districts may require their own building permit. Please contact the appropriate district for more information. The districts are:

• Central County Fire & Rescue
• Cottleville Fire Protection District
• Lake Saint Louis Fire Protection District
• New Melle Fire Protection District
• O'Fallon Fire Protection District
• Wentzville Fire Protection District
• View a map of the fire districts (PDF)

Contact Building staff

If you have any questions or concerns, please contact the Building Division's main telephone line at 636-379-5660. You may also contact the employees below directly: