Wash. Rev. Code § 18.280.030
A person licensed under this chapter is responsible for performing a visual and noninvasive inspection of the following readily accessible systems and components of a home and reporting on the general condition of those systems and components at the time of the inspection in his or her written report: The roof, foundation, exterior, heating system, air-conditioning system, structure, plumbing and electrical systems, and other aspects of the home as may be identified by the board. The inspection must include looking for certain fire and safety hazards as defined by the board. The standards of practice to be developed by the board will be used as the minimum standards for an inspection. The duties of the home inspector with regard to wood destroying organisms are provided in RCW 18.280.190.
RCW 18.280.030