Private Investigator Agency

A Private Investigator Agency endorsement is required for any business that:

  • Provides investigation, escort, or bodyguard services.
  • Performs property loss prevention activities.


All agency owners, partners, or qualifying agents must:

  • Be at least 18 years old, if applying for unarmed endorsement.
  • Be at least 21 years old, if applying for armed endorsement.
  • Be a United States citizen or resident alien.
  • Have no criminal convictions that directly relate to the capacity to perform the duties of a private investigator and/or hinder public safety.
  • Have a physical location in Washington.

Licensing requirements and additional supporting documents

For veterans

U.S. veterans may be eligible for partial reimbursements of costs. For more information visit the Education and Training | Licensing and Certification.


State endorsement


Private Investigator Agency with Unarmed Principal


Private Investigator Agency with Armed Principal


Additional fees

State tax registration $0
Registering your business name as a trade name $5
Business License Application fee Variable fee

How to apply


Add a state endorsement to your business

Apply for a new business license

Online assistance
Setting up your business licensing and tax account
How to add a state endorsement

By mail

Complete the licensing requirements above and mail to:

Business Licensing Service
P.O. Box 9034
Olympia, WA 98507-9034