Permit Requirements for Saint Paul, Oregon
For HVAC projects in Saint Paul, determining the correct permitting authority depends on whether the project site is located within the incorporated city limits or in an unincorporated area of Marion County.
Authority Having Jurisdiction (AHJ)
Most jurisdictions require permits for HVAC work to ensure safety and code compliance. The governing body responsible for issuing these permits varies by specific location:
General HVAC Guidelines
Permits are usually required for new installations, structural modifications, or major repairs. While minor maintenance or cosmetic updates may be exempt, landowners should always verify local codes before work begins.
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If you have found a direct link to a permit portal or a specific local ordinance for HVAC in this area, please submit an update.
Because Saint Paul is located within Marion County, the following broader county regulations may also apply to your project:
Oregon, Marion County Hvac Permit Regulations and County Ordinances for Unincorporated Areas
Marion County HVAC Permit Requirements
Marion County is responsible for issuing all permits in unincorporated areas. For properties within incorporated cities that contract with Marion County, permit jurisdiction can vary by the type of permit. HVAC (mechanical) permits are required for the installation, alteration, or repair of heating, cooling, and ventilation systems, including gas piping and ductwork.
- County Building & Safety Division: Marion County Building Inspection handles permits for unincorporated areas and for cities that do not have their own building inspection programs. They review plans and issue permits for mechanical work.
- Unincorporated Areas: If your property is in an unincorporated area of Marion County, you will apply for your permit directly through Marion County Public Works.
General HVAC Permit Requirements in Oregon
In Oregon, a mechanical permit is a formal authorization from the authority having jurisdiction (AHJ) that confirms an HVAC installation, replacement, or alteration meets the Oregon Mechanical Specialty Code (OMSC). This permit triggers required inspections. Permits are generally required for:
- Installing or changing any part of a heating or cooling system that requires venting.
- Installing or modifying systems with ductwork.
- Installing, altering, or repairing gas piping between the meter or tank and an appliance.
- Installing bath fans, dryer exhausts, kitchen range exhausts, and other vented appliances.
- Installing wood stoves, fireplace inserts, or pellet stoves and their venting.
Even if a building permit is not required for a project, a mechanical permit may still be necessary for HVAC work. Homeowners performing their own mechanical work are still required to obtain the necessary permits and pass inspections.
Resources to Learn More
The following statewide building codes and regulations apply universally to all jurisdictions within Oregon:
Oregon Hvac Legislation, Codes, and Guidelines
Oregon HVAC Building Codes and Legislation
Oregon regulates heating, ventilation, and air conditioning (HVAC) systems through a series of state-specific specialty codes. These codes are updated periodically to incorporate modern standards, energy efficiency requirements, and safety protocols. As of April 2026, the primary codes governing mechanical systems in the state include the 2025 Oregon Mechanical Specialty Code (OMSC) and the 2023 Oregon Residential Specialty Code (ORSC).
The 2025 OMSC, which became mandatory on April 1, 2026, is based on the 2024 editions of the International Mechanical Code (IMC) and the International Fuel Gas Code (IFGC), with specific Oregon amendments. For residential construction, the 2023 ORSC provides the governing standards. Recent legislative and regulatory updates have introduced significant changes, including new requirements for heat pumps in certain new residential construction projects where split-system air conditioning is installed, aimed at improving energy efficiency and reducing long-term utility costs for homeowners.
Primary Regulatory Agencies
The administration and adoption of these building codes are managed by the following state entities:
- Oregon Building Codes Division (BCD): A division within the Department of Consumer and Business Services, the BCD is the primary agency responsible for adopting, administering, and enforcing the state's specialty codes, including the mechanical and residential codes.
- Residential and Manufactured Structures Board (RMSB): This board works with the BCD to review and approve updates to residential building codes, including recent measures regarding energy-efficient HVAC and heat pump mandates.
- Mechanical Board: This board collaborates with the BCD to adopt and administer the Oregon Mechanical Specialty Code.
- Construction Contractors Board (CCB): While the BCD sets the technical standards, the CCB is responsible for issuing specialty contracting licenses for HVAC work in the state.
Resources to Learn More