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Idaho, Franklin County HVAC Permit Regulations and County Ordinances for Unincorporated Areas

Franklin County HVAC Permit Requirements

In Franklin County, Idaho, building permits are required for residential and commercial construction in unincorporated areas. This includes HVAC installations, replacements, and modifications. The county follows the Idaho Building Code (2018 IBC) and Idaho Residential Code (2018 IRC) with state amendments. For projects valued at $2,000 or more, contractors must be registered with the Idaho Contractors Board and provide proof of workers' compensation and general liability insurance.

The Franklin County Building Inspector's office handles permit applications. A building permit must be obtained before commencing construction, and failure to do so can result in a fine double the permit fee. Structures exceeding 200 square feet generally require a permit.

For HVAC work specifically, a mechanical permit is an official authorization required before work can begin. Inspections are conducted to ensure the work complies with the adopted code. New HVAC system installations, as well as equipment replacements, typically require a permit. Modifications or new runs of natural gas or propane piping connected to HVAC equipment also fall under permit requirements.

The process generally involves:

The typical processing time for a building permit is a minimum of 30 days from the submission of a complete application. For specific fee rates, it is recommended to contact the Franklin County Building Department directly.

Properties in Unincorporated Areas

For properties located in unincorporated areas of Franklin County, the county's Building Inspector is the authority for issuing building permits. This means that if your property is not within the limits of an incorporated city, you will need to obtain permits through the county. Building permits are required for both residential and commercial construction in these areas. The application process and requirements, including the need for a septic permit and detailed construction plans, apply to these unincorporated areas as well.

It's important to note that all land in the county is zoned as agriculture, and any land intended for building must be changed to a building lot. Research into the property's history may be necessary to determine if the parcel has been previously split or broken off another parcel. If you are in an approved subdivision, a copy of your deed will be required.

Resources to Learn More

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

Idaho Hvac Legislation, Codes, and Guidelines

State Statutes and Adopted HVAC Codes

In Idaho, the regulation of heating, ventilation, and air conditioning (HVAC) systems is governed by Title 54, Chapter 50 of the Idaho Code. This legislation establishes the legal framework for the installation, improvement, extension, and alteration of HVAC systems throughout the state. To ensure safety and efficiency, Idaho adopts and enforces specific model codes published by the International Code Council (ICC). As of the most recent regulatory information, the state utilizes the 2018 editions of the International Mechanical Code (IMC), the International Fuel Gas Code (IFGC), and Parts V and VI of the International Residential Code (IRC). These codes set the minimum standards for equipment installation, ventilation rates, combustion air calculations, and venting configurations.

Primary State Board and Agencies

The primary state-level authority responsible for administering these standards is the Idaho Division of Building Safety (DBS), which operates under the Idaho Division of Occupational and Professional Licenses (DOPL). The Idaho Heating, Ventilation, and Air Conditioning Board, housed within this structure, is responsible for promulgating rules, overseeing contractor licensing, and ensuring compliance with the adopted codes. While the state sets these minimum standards, it is important to note that Idaho operates a dual-track system; many counties and incorporated cities maintain their own building departments and may act as the local Authority Having Jurisdiction (AHJ) for issuing mechanical permits and conducting inspections, provided their programs meet or exceed state requirements.

Resources to Learn More

Select a City in Franklin 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.

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