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Contact us: Private investigators

We no longer offer in-person customer counter service at our Black Lake office. For the quickest service, log in or sign up for online account access.

Phone hours

  • Monday – Friday, 9 a.m. – 4 p.m.

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:

Holiday closures
HolidayOffice closed
New Year's DayMonday, January 2, 2023
Martin Luther King DayMonday, January 16, 2023
President's DayMonday, February 20, 2023
Memorial DayMonday, May 29, 2023
Freedom DayMonday, June 19, 2023
Independence DayTuesday, July 4, 2023
Labor DayMonday, September 4, 2023
Veteran's DayFriday, November 10, 2023
ThanksgivingThursday, November 23, 2023
Native American Heritage DayFriday, November 24, 2023
ChristmasMonday, December 25, 2023
New Year's DayMonday, January 1, 2024

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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