Do you need a license to work as a plumber in Delaware?
Yes. In Delaware, providing plumbing services, which include installing and connecting gas piping, requires a master plumber license from the State Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners. An apprentice, journeyman or mechanic may work under the supervision of a master plumber who employs them or works full time for the same business. A homeowner may do plumbing other than gas piping in or about his or her own home that is not for sale or rent, after applying for a permit with the authorized inspection authority. A first violation carries a fine of $1,500 to $3,000. This is 24 Del. C. §§ 1802, 1807.
| What | Delaware |
|---|---|
| Plumber license | Master plumber license (Board of Plumbing/HVACR) |
Source
Read the statute in the Delaware Code (Delaware General Assembly): delcode.delaware.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.
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The same question in other states
- Alabama
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- District of Columbia
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