Overview

Delaware requires a state-issued license to work independently as a plumber. Licensing is administered by Delaware Division of Professional Regulation (DPR). Requirements include supervised experience, a written exam, and payment of licensing fees.

Always verify current requirements directly with Delaware Division of Professional Regulation (DPR) before beginning your application, as rules can change.

License tiers and what each allows

LicenseWhat you can doExam required
ApprenticeTraining level. Work under supervision.Registration only
Journeyman PlumberInstall, repair, and maintain plumbing systems under a master plumber.Yes. State exam (~$75 fee)
Master PlumberFull independent work, supervise others, pull permits.Yes. Advanced state exam

Step-by-step path

1

Register as an apprentice

Register with Delaware Division of Professional Regulation (DPR) before starting work to legally accumulate supervised hours.

2

Accumulate 7,200 hours of supervised experience

Work under a licensed master plumber. This takes approximately 4 years at full-time hours.

3

Pass the journeyman plumber exam

The exam covers state plumbing code and installation practices. Study 4-6 weeks with a state-approved prep guide.

4

Apply for your journeyman license

Submit your application to Delaware Division of Professional Regulation (DPR). Processing typically takes 2-4 weeks.

5

Renew biennially

Your Delaware plumber license renews every two years. Always renew on time.

Fee summary

ItemFee
Application / registrationVaries (check board)
Licensing exam$75
License issuanceVaries (check board)
License renewal (biennial)Varies (check board)
Fees change. Confirm current amounts directly with Delaware Division of Professional Regulation (DPR) before applying. The figures above were verified in April 2026.
Delaware Division of Professional Regulation (DPR) official site

Frequently asked questions

Can I transfer my plumber license from another state to Delaware?
Delaware may consider out-of-state experience during your application review. Formal reciprocity agreements are limited. Contact Delaware Division of Professional Regulation (DPR) directly to discuss your situation before applying.
How long does it take to get licensed as a plumber in Delaware?
Timeline depends on the license tier. Entry-level licensing requires completing the required training hours (7,200 hours (~4 yrs)), passing the exam, and waiting for application processing (typically 2-4 weeks).
Can AI replace a licensed plumber?
This work requires physical presence, hands-on judgment, and a state-licensed individual to sign off on work. State licensing laws require a human licensee to be legally responsible. That structural requirement protects this trade from automation.