The following persons are exempt from the licensing requirements of this chapter when acting within the scope of their license or profession:
(1) Engineers;
(2) Architects;
(3) Electricians licensed under chapter 19.28 RCW;
(4) Plumbers licensed under chapter 18.106 RCW;
(5) Pesticide operators licensed under chapter 17.21 RCW;
(6) Structural pest inspectors licensed under chapter 15.58 RCW; or
(7) Certified real estate appraisers licensed under chapter 18.140 RCW.