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In unincorporated King County, basic roof repairs or reroofing of existing buildings typically does not require a permit. A permit is required if a heavier roof covering, such as a tile roof, replaces an existing composition or wood shingle or shake roof. If the roof structure, such as trusses or rafters, is altered or replaced, a permit is required. For commercial structures, the fire resistive rating of the roof must not be diminishe