Obtain Your License

Pursuing a career in the Plumbing field? Study at home for your Washington Plumbing license exam with our fully online, user-friendly, and self-paced course.

  • Washington Plumbing Contractor/Journeyman – Books Only Package


    As of this time we do not offer any courses for this exam. We do offer all the required books for this exam here in one complete package. Individual books can be found in our bookstore. Please be sure to check back in the future for possible course material, as we are always adding to our course catalog.

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  • State Licensed Contractor Application Processing

    Washington Application Processing


    @HomePrep Application Processing is here to ensure your application to become a state licensed contractor gets filled out correctly and promptly. We provide a professional service ensuring your privacy and comfort throughout the entire process. Following your purchase of the Washington Application Processing our AP Coordinator will contact you to discuss the next steps. If you have any questions please call us at 800-952-0910. We look forward to working with you.

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Requirements To Complete

About This License

Allows the installation, alteration, or repair of portable water, liquid waste, and medical gas systems within a building in the state of Washington you must be certified by the Department of Labor and Industries. The Department issues trainee, journeyman, and speciality/residential plumber certificates, and medical gas piping installer endorsements.

Requirements to Obtaining Your License

  • Plumbing must be conducted through registered contractors.
  • Experience requirements are 6,000 hours for Residential Speciality and 8,000 hours, of which 4,000 must be commercial, for Journeyman.
  • All applicants for journeyman and residential speciality exams are required to have completed, prior to testing, 16 hours of continuing education with a minimum of 4 hours of that being electrical.

Applying For Your License

Journeyman application/exam fee is $139. Contractor Registration fee is $151.

Department of Labor and Industries
PO Box 44470
Olympia, WA 98504-4400

Exam Details

  • Minimum score of 70%
  • The 3-part examination consists of Uniform Plumbing Code questions, a waste and vent pipe sizing drawing and a water pipe sizing drawing.

Books and References for the Exam

These books are available for purchase from our online contractor’s bookstore or by calling our office at 1-800-952-0910.

The following references are not allowed to be used during testing:

  • 2012 Uniform Plumbing Code

Exam Review Education

Please check back later for review and training for this license.

Continuing Education

All journeyman and residential speciality plumbers must obtain 16 hours of continuing education within a two-year renewal cycle. Plumber trainees must complete 8 of the required 16 hours every year. All of these required courses must be taken within the renewal cycle. We offer this online.

Reciprocity Agreement

As of this time, there is no reciprocal licensing.

How It Works


Obtain pre-approval from the state (if applicable).


Purchase Exam Prep materials.


Schedule and pass your state exams.


Submit to the state your application, licensing fee, and proof of insurance.