Washington Residential Service (PL04) Contractor License

The Residential Service (PL04) Contractor License allows you to:

• Perform the following work on single-family dwellings and duplexes only:
  • Service, repair, or replace:
    • Previously existing fixtures, piping, and fittings that are outside the interior wall or above the floor, often, in a like-in-kind manner
• Perform plumbing work as needed to:
  • Perform drain cleaning
  • Perform leak repairs on:
    • Any pipe, fitting, or fixture from the leak to the next serviceable connection
• Supervise plumber trainees provided:
  • The trainees have been supervised by an appropriate journey level or specialty plumber for the trainees' first two thousand hours of training

A residential service plumber MAY NOT perform plumbing for new construction of any kind.

How to Get the Residential Service (PL04) Contractor’s License in Washington?

1. Have experience as a Plumber Trainee. If you don’t have experience as a Plumber Trainee, meet the following requirements and apply for a Plumbing Trainee certificate:
   • Be at least 16 years old
   • Work under the supervision of a journey level or certified plumber
   • Take the 8 hours of plumbing code and 4 hours of electrical classes in two years
2. Fill out and complete anAffidavit of Experience to report the supervised work hours as a plumber trainee
3. Meet the required experience or education depending on the license applying for:
   • Residential Service (PL04): 4,000 hours as a plumber trainee under the supervision of a Journey Level, Residential or Residential Service plumber
4. Fill out and notarize an Application for Contractor License
5. Complete and obtain a Surety Bond or Assigned Savings Account
6. Get a Certificate of Liability Insurance
7. Choose a designated plumber to hold the valid plumber certificate. The designated plumber can be another person or the applicant, depending on whether they are applying as a business or as a sole proprietor
8. Meet the following educational requirements and apply for the plumber examination with PSI©:
   • Residential Service (PL04) - 24 hours of continuing education, including:
     • 12 hours of Uniform Plumbing Code
     • 4 hours of Industry-Related Electrical
     • 8 hours in any Code, Industry-Related Electrical, or Industry-Related Plumbing area
9. Refer to the PSI© Plumbing Examinations Candidate Information Bulletin, for more information on the test locations, subjects and books to prepare for the exam
10. Submit the completed documents to:
    Washington State Department of Labor & Industries
    Plumber Certification
    PO Box 44470
    Olympia WA 98504-4470

Washington Residential Service (PL04) Contractor License Exam Prep Course

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  WASHINGTON RESIDENTIAL SERVICE (PL04) CONTRACTOR (PSI©) COURSE

  Login credentials emailed upon enrollment

  Unlimited access (no time limits)

  Lecture videos

  Practice questions

  Key concepts

  Step-by-step solutions to math problems

  Live review

  classes

  $525.00

  $525.00

  Demo

Washington Residential Service (PL04) Contractor License Exam

Below is all the information related to the trade exam, including the official reference list.

Washington Residential Service (PL04) Contractor Trade Exam

• Testing Method: Computer-based testing
• Testing Company: PSI©
• Number of Questions: 65
• Types of Questions: Multiple choice
• Time Allowed: 90 Minutes
• Minimum Passing Score: 70%
• PSI© Residential Service (PL04) Official Content Outline

Candidates must apply for eligibility with the Department before being allowed to take the examination. Please note that this is a closed-book examination.

Washington Residential Service (PL04) Contractor Book Set

This set of books includes all required references for the Residential Service (PL04) exam. Orders placed before 2 PM are shipped the same day via UPS and a tracking number is emailed before 3 PM.

Washington Residential Service (PL04) Contractor Exam Books

Books Not Allowed in Testing

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