Administrative overview · FIPS 29099
Jefferson County permit authority
The first compliance decision is jurisdictional: identify the office with statutory authority over your parcel, then use its filing and inspection sequence to keep the project moving.
Jurisdictional status
County
This county profile is the primary starting point for unincorporated-area permitting.
Responsible agency
Jefferson County County Services Department — Code Enforcement Division
For a project in or near Jefferson County, this office is the identified point of contact for permit intake, statutory code enforcement, plan review coordination, and inspection release conditions. Confirm the parcel’s boundary and project type before relying on the county lane.
Direct contact
636-797-5310
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
725 Maple Street, Hillsboro, MO 63050; mailing address P.O. Box 100, Hillsboro, MO 63050.
Operating hours
N/A—the reviewed official permit pages do not publish Code Enforcement office hours.
Review expectation
N/A—the reviewed official pages do not publish a standard permit-review timeline.
Compliance workbench
Choose the next project decision.
Apply online
Open the verified digital gateway, application form, and review timeline.
Open guide →Fees & penalties
Understand fee schedules, enforcement exposure, and stop-work liabilities.
Open guide →Codes & exemptions
Read the code framework, minor-work exemptions, and inspection lane.
Open guide →Agency website
Visit the primary public source for current notices and contact changes.
Open guide →Source trail
Official sources for this profile
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Frequently asked questions for Jefferson County
Who handles permitting for this jurisdiction?
Jefferson County County Services Department — Code Enforcement Division is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
How should I begin an application?
Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 636-797-5310.
How long might review take?
N/A—the reviewed official pages do not publish a standard permit-review timeline.
How are inspections scheduled?
Register and use the Citizen Portal to request inspections and check application status: https://www.civicgov4.com/mo_jeffersoncounty/portal/. The Code Enforcement Division can also be reached at 636-797-5310.
Which codes and exemptions should I review?
Jefferson County Council Ordinance 21-0356 amended the county Building Code and adopted the fee schedule effective July 26, 2021. The reviewed official pages do not identify a newer specific 2026 code edition. No permit is required for qualifying decks up to 200 square feet and 30 inches above grade that are unattached and do not serve the required exit; fences up to 8 feet; gas or electric water-heater replacement; one-story detached sheds, playhouses, and similar accessory structures up to 200 square feet; painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work; prefabricated pools less than 24 inches deep; retaining walls up to 6 feet unless supporting a surcharge; low sidewalks and driveways; swings/playground equipment accessory to one- or two-family dwellings; qualifying water tanks up to 5,000 gallons; qualifying wall-supported window awnings; minor electrical repairs; portable appliances; certain plumbing leak/stoppage repairs; and ordinary repairs that do not affect structure, egress, utilities, or public health and safety.