Do you need a license to work as a plumber in Hawaii?
Yes. In Hawaii, doing plumbing work requires an individual journey worker or master plumber license from the Board of Electricians and Plumbers, and contracting for it requires a C-37 plumbing specialty contractor license from the Contractors License Board. A person may make emergency plumbing repairs in his or her own principal residence if the repairs do not involve rearranging valves, pipes or fixtures and do not touch sewer lines, drains, gas lines or fixtures served by backflow devices. An apprentice or trainee may work unlicensed under the supervision of an appropriately licensed person. This is Haw. Rev. Stat. §§ 448E-1, 448E-9, 444-7, 444-9; Haw. Admin. R. § 16-77-28.
| What | Hawaii |
|---|---|
| Plumber license | Plumber license + C-37 contractor license |
Source
Haw. Rev. Stat. §§ 448E-1, 448E-9, 444-7, 444-9; Haw. Admin. R. § 16-77-28
Read the statute in the Hawaii Revised Statutes (Hawaii State Legislature): capitol.hawaii.gov.
Checked against the statute on November 13, 2026.
This is a summary of a published statute, not legal advice. Rules change, local ordinances can add to them, and the terms of a specific lease may differ. Check the citation and speak to a lawyer before acting.
How Seayora uses this rule
A contractor on Seayora keeps each license with its issuing state, its expiry date and the last four digits of its number, and the business is warned before one lapses — on the website and both phone apps. A customer finding a pro on Seayora sees whether a license is on file.
Guides on this rule
- Contractor License Requirements by State: Every Trade — Which states require a state license for electricians, plumbers, HVAC, general and home improvement contractors, with the statute for each.
Compare this rule in every state
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The same question in other states
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Idaho