Utah, Washington County HVAC Permit Regulations and County Ordinances for Unincorporated Areas

Washington County Building & Safety Divisions

Washington County, Utah, has a Community Development Department that oversees building permits and inspections. This department is comprised of the Building, GIS, and Planning divisions. They manage the building permit and inspection process, subdivision plat reviews, and other land use-related functions. Applications for building permits are accepted electronically through the county's online permitting software system.

For properties within incorporated cities in Washington County, the respective city's building department handles permit applications, not the county.

Rules for Properties in Unincorporated Areas

Washington County issues building permits specifically for properties located in unincorporated areas of the county. If your property is in an unincorporated area, you will need to determine if a permit is required for your HVAC project. Generally, replacing an HVAC system with the same type, installing a different type of HVAC system, modifying or installing ductwork, or adding central HVAC to a home all require a mechanical permit.

The permitting process for unincorporated Washington County involves determining if your parcel is in an unincorporated area, gathering required documents, and applying electronically. Required documents may include septic permits from the Southwest Utah Public Health Department, verification of water, and project-specific building permit documents.

Utah statewide adopted building codes, such as the 2021 International Residential Code (IRC), are enforced. Permit fees are typically valuation-based, with a minimum fee for lower valuations, plus a state surcharge.

Resources to Learn More

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

Utah Hvac Legislation, Codes, and Guidelines

State Statutes and Adopted Codes

Building codes in Utah are governed by the State Construction and Fire Codes Act, found in Title 15A of the Utah Code. The state adopts nationally recognized construction codes, including the International Building Code (IBC) and the International Residential Code (IRC), which contain the primary requirements for HVAC systems. As of the most recent major updates, Utah has adopted the 2021 editions of the International Codes, including the International Mechanical Code (IMC), International Fuel Gas Code (IFGC), and the International Residential Code (IRC), with specific statewide amendments. These codes establish the minimum standards for heating, cooling, ventilation, and fuel gas systems in both residential and commercial construction.

Primary State Agencies and Boards

The adoption and oversight of these standards are managed by the following entities:

Uniform Building Code Commission (UBCC): This body is statutorily authorized to review and recommend building codes to the Utah State Legislature. It plays a central role in the adoption, modification, and interpretation of construction codes, including HVAC-related standards. The commission includes representatives from various construction trades, including an HVAC contractor, as well as building officials, engineers, and architects.
Division of Occupational and Professional Licensing (DOPL): DOPL provides administrative support to the Uniform Building Code Commission and oversees the licensing of professionals engaged in construction-related trades.
Utah State Legislature: The Legislature is responsible for the final passage of legislation that adopts the state construction codes, typically following the recommendations and reports provided by the UBCC.

Resources to Learn More

Select a City in Washington 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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