Missouri, Cass County Remodeler Permit Regulations and County Ordinances for Unincorporated Areas

Cass County Building & Safety Division

The Cass County Building Codes Department is the Authority Having Jurisdiction (AHJ) for building permits, alterations, additions, remodeling, repairs, and changes of use in the unincorporated areas of Cass County, Missouri. They administer building codes adopted by the county, which serve as minimum construction standards.

Unincorporated Areas

For properties located in the unincorporated areas of Cass County, a building permit is required for construction, modification, or repair. This includes work on on-site sewage disposal systems.

Demolition Work During Remodels

While specific triggers for demolition permits during a remodel are not explicitly detailed in the provided search results, general demolition waste disposal regulations are mentioned. Anyone engaged in demolition must maintain records of disposal sites for one year, available for department review.

Converting Non-Living Spaces to Habitable Areas

Converting spaces like garages, attics, or unfinished basements into habitable living areas generally requires a building permit. This is because these converted spaces must meet current residential code and energy code requirements for safety and occupancy.

Garages

Converting a garage into living space will require a building permit. Any associated plumbing, electrical, or mechanical work will also require separate permits. Alternative off-street parking may be required if the conversion reduces available parking. Plans detailing the proposed work, including floor plans, window and door openings, and locations of safety features like smoke alarms, are necessary.

Attics

Converting an unfinished attic into habitable space (e.g., bedroom, office, playroom) almost always requires a permit. This is due to the need to meet specific building codes for safety and occupancy, which include minimum ceiling height (often at least 7 feet for 50% of the space), minimum room dimensions (e.g., 70 sq. ft. and 7 feet in any direction), and egress requirements (typically two means of escape, such as a staircase and an egress window). Structural changes, new electrical wiring, and the addition of code-compliant staircases also necessitate permits.

Unfinished Basements

Adding finished basement space to an existing dwelling requires a building permit. A permit issuance fee of $50.00 is added to the per square foot permit fee when finishing a basement in an existing dwelling, separate from new construction.

Resources to Learn More

Note: The following state-wide building codes and regulations apply universally to all jurisdictions within Missouri, including Cass County.

Missouri Remodeler Legislation, Codes, and Guidelines

Missouri State-Level Building Codes and Legislation for Remodelers and Residential Renovations

Missouri does not have a single, statewide building code. Instead, building codes are adopted and enforced at the local level by municipalities and counties. These local jurisdictions typically reference model codes from the International Code Council (ICC). The most commonly adopted versions of these codes in Missouri include the 2015 editions of the International Building Code (IBC), International Residential Code (IRC), International Existing Building Code (IEBC), International Plumbing Code (IPC), and International Mechanical Code (IMC). Some areas may also reference the 2009 International Energy Conservation Code (IECC) and the National Electrical Code (NEC), which are enforced locally. It is crucial for remodelers to verify the specific codes and any local amendments in effect with the local building department for their project's location. Some municipalities, like O'Fallon and Town and Country, have adopted the 2021 or 2024 editions of the International Existing Building Code, respectively.

The primary state board or agencies that set these standards are not centralized at the state level for building codes. Instead, the Division of Professional Registration supports various professional licensing boards and commissions responsible for regulating professions within the state. However, for building codes, enforcement and adoption are primarily handled by local building departments and officials.

Generally, the classification of remodels and when demolition guidelines apply are determined by local ordinances and the adopted building codes. The International Residential Code (IRC) and International Existing Building Code (IEBC) provide frameworks for alterations and repairs. Structural alterations, such as converting attics or basements to habitable spaces, typically require permits and are subject to more stringent requirements than cosmetic remodels. Demolition guidelines are also locally enforced and often require specific permits, advance notice to neighbors, and adherence to safety and debris removal protocols. For instance, some municipalities require a notice of intention to demolish to be sent to properties within 200 feet, and demolition must proceed continuously and be completed within a specified timeframe.

Missouri law broadly defines remodeling as any work that erects, demolishes, alters, or repairs improvements to a property. This includes kitchen and bathroom renovations, room additions, structural changes, and electrical, plumbing, and HVAC upgrades. For substantial renovations, Missouri statute defines it as modifications affecting at least fifty percent of the square footage of a building or costing at least fifty percent of the building's fair market value.

Resources to Learn More

Select a City in Cass County

If your project is located within incorporated city limits, you will likely need to follow municipal ordinances rather than county rules. Select your city below to view local regulations.

Help Us Improve This Guide

Did you find a dead link, or do you have the direct link to the Cass County permit application portal? Help us keep this information accurate by submitting an update.