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

Kittitas County HVAC Permit Requirements

Kittitas County requires permits for various construction and alteration projects, including those involving mechanical systems like HVAC. If you are constructing, enlarging, altering, repairing, moving, demolishing, or changing the occupancy of a building or structure, or installing, enlarging, altering, repairing, removing, converting, or replacing any gas, mechanical, or plumbing system, you must first obtain the necessary permits from Kittitas County Community Development Services.

For properties in unincorporated areas of Kittitas County, the county's Community Development Services department is responsible for issuing building permits.

Permit Requirements for Unincorporated Areas

Kittitas County issues building permits exclusively for properties located in unincorporated areas. If your property is within an incorporated city, that city's building department will handle permit applications.

A building permit is generally required for any work that involves the erection, placement, or alteration of structures or land uses within the county.

HVAC Specifics

While specific HVAC permit requirements are not detailed separately, mechanical permits are among the types of permits issued by Kittitas County Community Development Services. Mechanical inspections are conducted when the HVAC system, appliance vents, and environmental vents are installed, and all gas piping is completed and tested.

When submitting for a building permit, an "HVAC Sizing Worksheet" may be required as part of the electronic submittal documents.

Exemptions

Certain minor projects may be exempt from requiring a building permit. For example, one-story detached accessory structures with a floor area not exceeding 200 square feet (for residential uses) are exempt if they are not used as habitable space and do not contain plumbing or mechanical systems. However, these exempt structures must still meet setback requirements and other applicable codes.

Application Process

Permit applications, including construction drawings, can be submitted electronically via email or through an online upload feature. A completed building permit application, along with site plans and construction drawings, is required. Deposits are required at the time of application submittal, with the balance of fees due upon permit issuance.

Resources to Learn More

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

Washington Hvac Legislation, Codes, and Guidelines

Washington State HVAC Building Codes and Legislation

The Washington State Building Code is established by the state legislature under the Revised Code of Washington (RCW) Chapter 19.27. This statute mandates the adoption of specific national model codes, which are then amended at the state level to meet Washington's unique requirements for safety, energy efficiency, and indoor air quality.

As of the current standards, Washington utilizes the 2021 editions of the International Code Council (ICC) model codes, including the 2021 International Mechanical Code (IMC) and the 2021 International Residential Code (IRC). Additionally, Washington maintains its own state-specific energy and ventilation standards, known as the Washington State Energy Code (WSEC) and the Washington State Ventilation and Indoor Air Quality Code, which are codified in Title 51 of the Washington Administrative Code (WAC).

The primary agency responsible for the development, adoption, and amendment of these codes is the Washington State Building Code Council (SBCC). The SBCC is a governor-appointed body that advises the legislature on building code issues and ensures that the state's construction standards remain consistent and effective across all local jurisdictions. While the state sets these minimum requirements, local cities and counties are responsible for the enforcement of these codes and may adopt local amendments, provided they are not less restrictive than the state-level standards and, in many cases, receive approval from the SBCC.

Resources to Learn More

Select a City in Kittitas 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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