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Kittitas (pronounced 'KITT-i-tass') County is located in central Washington State. It spans from the lush forested Cascade Mountains to the upper Yakima River Valley plains and the Columbia River.
Any owner or authorized agent who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any gas, mechanical or plumbing system, or to cause any such work to be done, shall first submit a complete application to Kittitas County Community Development Services to obtain the required permit(s).
Kittitas County Code Title 14, Building and Construction
It is easier to answer this question by listing the work exempt from a building permit per the International Building Code Section 105 and the International Residential Code Section R105:
Exemptions from the permit requirements shall not be deemed to grant authorization for any work to be done in a manner in violation of the building code or any other law ordinance of this jurisdiction.