County Building Permits
Cass County, MO - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Cass County, Missouri. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
All properties in unincorporated Cass County.
- Department
- Cass County Building Codes Department
- Address
- 102 E Wall Street, Harrisonville, MO 64701
- Phone
- 816-380-8134
- Website
- https://www.casscounty.com/
Application Process
- Confirm the parcel is in unincorporated Cass County and check zoning, floodplain, driveway, and wastewater constraints before drawing plans.
- Obtain the applicable county building application packet and assemble complete plans, site information, and any supporting engineering.
- Submit the application to the Cass County Building Codes office; incomplete applications are not accepted.
- County staff reviews for building code, zoning ordinance, flood zone ordinance, and other county ordinance compliance.
- Resolve comments, pay permit fees, and wait for issuance before starting work.
- Schedule required inspections with the county and complete all corrections before final approval or occupancy.
General Requirements
Work shall not start until a permit is issued; accessory buildings, residential construction, and regulated wastewater work clearly require permit review.
Required Documents
- Completed county application
- Plans and specifications
- Site information
- Parcel details
- Wastewater or engineering support as required by the project
- Building code
- 2006 International Building Code and county amendments for post-frame buildings; separate zoning and floodplain ordinances also apply.
- Owner-builder
- Permit applicant or permit holder takes full responsibility and becomes the point of contact from start to finish.
Fees
- Plan check fee
- Extra review time beyond one hour for incomplete plans may be billed at $122.00 per hour with a one-half hour minimum.
- Penalty (no permit)
- Working without a permit can trigger additional fees or prosecution.
- Payment note
- Confirm acceptable payment methods with the Building Codes office.
Work That Does NOT Require a Permit
Contact the Cass County Building Codes Department to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
- Cass County Building Codes at 816-380-8134 (phone)
- Inspection hours
- 6:30 a.m. to 3:00 p.m., Monday through Friday, excluding holidays
Typical inspection sequence: Varies by project; county packet indicates inspections and final approval are required before occupancy or completion.
Additional Resources
- Building code: 2006 International Building Code and county amendments for post-frame buildings; separate zoning and floodplain ordinances also apply.
- Zoning information: View zoning info
- Cities of Cass County
- License lookup guide: Missouri Contractor License Requirements
- Contract template: Missouri Homeowner-Contractor Agreement
- Missouri hub: Missouri Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Cass County Building Codes Department before applying.
Frequently Asked Questions
Cass County Building Permit FAQ
- Do I need a building permit in unincorporated Cass County, MO?
- Work shall not start until a permit is issued; accessory buildings, residential construction, and regulated wastewater work clearly require permit review.
- How do I apply for a building permit in unincorporated Cass County, MO?
- 1. Confirm the parcel is in unincorporated Cass County and check zoning, floodplain, driveway, and wastewater constraints before drawing plans. 2. Obtain the applicable county building application packet and assemble complete plans, site information, and any supporting engineering. 3. Submit the application to the Cass County Building Codes office; incomplete applications are not accepted. 4. County staff reviews for building code, zoning ordinance, flood zone ordinance, and other county ordinance compliance. 5. Resolve comments, pay permit fees, and wait for issuance before starting work. 6. Schedule required inspections with the county and complete all corrections before final approval or occupancy.
- How do I schedule a building inspection in unincorporated Cass County, MO?
- Inspections can be scheduled via: Cass County Building Codes at 816-380-8134.
Need help with your project?
Navigating permits in Cass County (Unincorporated Area) can be complicated.
Jaspector connects you with local experts who can review your scope, verify your contractor, and help you understand what permits your project actually needs.
Learn how Jaspector works