Building permits in Washington
1 jurisdictions, each with the department that issues, its portal and its phone number. Cities issue their own permits; counties cover unincorporated areas, which is the distinction that sends most contractors to the wrong office.
1 checked against the department's own page
Licensing
Contractors must register with L&I (bond + liability insurance) as a general or specialty contractor before doing work.
Washington State Dept. of Labor & Industries (L&I)