The Wentzville Fire Protection District issues permits for building construction, commercial use (occupancy), open burning, and commercial fireworks. The private use of recreational fireworks may be prohibited by certain city ordinances (please check with your municipality). We strongly discourage the use of fireworks due to their dangerous nature.

When permits are required?

  • Open Burning
  • Commercial Occupancy Permits
  • Firework Stands & Firework Displays
  • Residential buildings which have 3 or more units.
  • All Commercial buildings and additions
  • Kitchen hood and suppression systems
  • Sprinkler Systems -Does not include one and two family dwellings.
  • Fire Main/Fire Alarm
  • Special Amusement Buildings
  • Carnivals and Fairs
  • Exhibits and Trade Shows
  • Construction Blasting
  • Storage of Blasting Agent
  • Site Plan Review
  • Temporary Membrane Structure
  • Tents & Canopies
  • Installation of Security Gates (Mutual Aid Knox Box Required)
  • Rides

Open Burning Permits

Regulations for Open Burning Permit

Permits to conduct open burning are available Monday-Friday September 15-April 15, just contact our office to verify you are in unincorporated St. Charles County and to have permit emailed or pick up during office hours.

Contractors must contact Department of Natural Resources for Burning instructions 636-528-4779.  Once approved, provide a copy of permit to the fire district.


Construction Permits

Application for Permit


Variance Request

All Commercial and Residential Buildings which have 3 or more units must be permitted. Completed building permit applications must be submitted with an electronic version to [email protected]  .   All plans must be sealed.  The applicant will be notified when permits are ready to be picked up and paid for. CASH, CHECK or CREDIT CARD (2.5% convenience charge will be applied to balance)  No work may begin prior to permit issuance.

Occupancy Permits

Application for Occupancy Permit

Occupancy permits are required by the Wentzville Fire Protection District for owner or tenants to occupy or re-occupy existing commercial spaces or to occupy newly constructed space. The City and the County may also require an occupancy permit to be issued as well. The application is not a permit itself.   Emergency Contacts may be updated by emailing information to [email protected] .  If a Knox Box is required on your building, use 4400 series at approximately 5′ high.   When choosing a fire department for the purchase of a Knox Box, unless specified by Fire Marshal, Wentzville FPD is the default department.  If returned plans specify mutual aid, then, choose St CharlesCo Fire Prot Assn/Emerg Svd.   https://www.knoxbox.com/commercial-knoxboxes/

All questions regarding permits and the Fire Prevention Bureau may be directed to Chris Cuddihee, Fire Marshal at 636-332-9869 between 8:00 a.m. and 4:00 p.m. Monday through Friday or email Chris at: [email protected]


Frequently Asked Questions:

What are the current codes being enforced?
2015 ICC Building Code with amendments
2015 ICC Fire Prevention Code with amendments

There are amendments to the above codes, as well as local Ordinances dealing with fire hydrants, hazardous materials, street sizes and other fire related codes which are available by contacting us.

How many plans are required to be submitted along with application?

All plans can be submitted via email to [email protected]

  • Commercial -1 set electronically
  • Residential Buildings (3 or more units only) -1 set and a plot plan electronically.

Are they required to be signed or sealed and by whom?
Commercial Plans & Sprinkler Plans, must be signed and sealed by a Missouri Registered Design Professional (a Registered Architect or Professional Engineer).

Are numbers required on residential homes?
Yes… shall have the number so displayed on the dwelling in a position easily observed and readable from the public right-of-way. All numbers shall be in Arabic figures at least four (4) inches high and one half (1/2) inch wide stroke. All such numbers shall be contrasting color to the background to which they are mounted.