Administrative overview · FIPS 29037
Cass 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
Cass County Building Codes, Environmental Health and Zoning Department
For a project in or near Cass 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
816-380-8134
Call before mobilizing if the project has a boundary, occupancy, fire, septic, or utility question.
Permit counter
Cass County Building Codes, Environmental Health and Zoning Department, 30508 S.W. Outer Road, Harrisonville, MO 64701
Operating hours
Monday-Friday, 6:30 AM-3:00 PM.
Review expectation
The county does not publish a fixed plan-review duration and warns that permits are not issued at application. Once an inspection is requested, most inspections are scheduled for the next workday; permit work must generally begin and have an inspection requested within 180 days and be completed and approved within one year unless extended.
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 Cass County
Who handles permitting for this jurisdiction?
Cass County Building Codes, Environmental Health and Zoning Department 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 816-380-8134.
How long might review take?
The county does not publish a fixed plan-review duration and warns that permits are not issued at application. Once an inspection is requested, most inspections are scheduled for the next workday; permit work must generally begin and have an inspection requested within 180 days and be completed and approved within one year unless extended.
How are inspections scheduled?
Call 816-380-8134 between 6:30 AM and 3:00 PM Monday-Friday with the building permit number, assigned project address, inspection type, requested date, and whether it is a reinspection. Most inspections occur the next workday; footings, foundation walls, suspended slabs, post holes, piers, and deck piers may be same-day if requested by 1:30 PM and ready by 2:00 PM. Work must remain exposed until approved, and final inspection requires septic approval and a Certificate of Occupancy before use or occupancy.
Which codes and exemptions should I review?
The county's official code-amendment document states that Cass County uses the 2006 International Codes and 2005 National Electrical Code as adopted by the county. The Building Codes Department administers these minimum standards for new construction, alterations, additions, remodeling, repairs, and changes of use in unincorporated Cass County. Current 2025 application materials state that plans are reviewed under the 2006 International Codes. Under the county amendments, one-story detached accessory tool/storage sheds, playhouses, and similar structures up to 400 square feet are exempt from a Building Codes Department building permit, but may still require a Cass County Zoning Department permit and must comply with zoning rules. County materials also distinguish separate septic, floodplain, road-access, solar, generator, and other permits; confirm any agricultural or cosmetic exemption with the department.