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Contact us: Private investigators

Our Customer Service Counter has moved. The counter is located at 405 Black Lake Blvd, Olympia, WA 98502. Map and driving directions (

For questions about:

Getting or renewing your Private Investigative Agency license

Contact: State of Washington Business Licensing Service

Getting or renewing your Armed/Unarmed Private Investigator license or Certified Trainer license

Contact: Department of Licensing Public Protection Services Section

License Status, Regulations, and Business Practices for Private Investigative Agencies, Armed/Unarmed Private Investigators, and Certified Trainers

Contact: Department of Licensing Public Protection Services Section

For complaints only:

Office hours

Monday through Friday
8:30 a.m. to 4:30 p.m.

Holiday closures
HolidayOffice closed
New Year's DayMonday, January 1, 2018
Martin Luther King Jr. DayMonday, January 15, 2018
Presidents' DayMonday, February 19, 2018
Memorial DayMonday, May 28, 2018
Independence DayWednesday, July 4, 2018
Labor DayMonday, September 3, 2018
Veterans DayMonday, November 12, 2018
ThanksgivingThursday, November 22, 2018
Native American Heritage DayFriday, November 23, 2018
ChristmasTuesday, December 25, 2018
New Year's DayTuesday, January 1, 2019

Private investigator agencies

  • Mailing address:
    State of Washington
    Business Licensing Service
    PO Box 9034
    Olympia, WA 98507-9034
  • Physical location:
    Business Licensing Service
    6500 Linderson Way
    Tumwater, WA 98501
    Map and directions

Armed private investigators, unarmed private investigators, and certified trainers

  • Mail forms with payments to:
    Private Investigator Program
    Department of Licensing
    PO Box 35001
    Seattle, WA 98124-3401
  • Mail correspondence with no payments to:
    Private Investigators
    Department of Licensing
    PO Box 9649
    Olympia, WA 98507-9649
  • Physical location
    Department of Licensing
    405 Black Lake Blvd SW
    Olympia, WA 98502
    Map and directions

Overnight mailing (FedEx, UPS, USPS)

Private Investigators Program
Department of Licensing
1125 Washington Street
Olympia, WA 98501

Related information

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Access Washington – official state government website