Pen-and-ink North Carolina scene: a brick house with a wide front porch and an open crawlspace hatch, tall longleaf pines on one side and a plumber’s van and ladder on the other, rolling hills behind.

North Carolina plumbing license classes

which North Carolina
plumbing license
do you need?

P‑I, P‑II, RLP and fuel piping, side by side, in plain English.

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the short answer

North Carolina licenses plumbing through the State Board of Examiners of Plumbing, Heating, and Fire Sprinkler Contractors. P‑I covers water and drain, waste and vent systems in any building, P‑II covers the same work in single-family detached homes only, RLP covers exterior sewer and water service, and FP covers fuel gas piping.

every North Carolina plumbing class.

The Board’s definitions, in plain words.

P‑I: Plumbing, Class I. Potable water and drain, waste and vent piping in any building: residential, commercial or industrial.
P‑II: Plumbing, Class II. The same systems, in single-family detached dwellings only.
RLP: Restricted limited plumbing. Exterior building sewer piping, exterior water service piping of two inches or less, backflow preventers on that piping, and water filtration systems.
FP: Fuel piping. Fuel gas piping from an approved fuel source to any system, equipment or appliance inside the premises.
Qualified individual: Every place of business needs at least one listed qualified individual, regularly on duty to supervise and direct all licensed work.

Sources: NC State Board of Examiners of Plumbing, Heating, and Fire Sprinkler Contractors license definitions and FAQ. Last reviewed September 2026.

find the class for your work.

Tap the work you do to see which Board class covers it.

Where the Board puts it

commercial buildings.

P‑I covers water and drain, waste and vent piping in any building, commercial and industrial included.

Who asks: GCs and permit desks, who check your class on the Board’s license search.

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what the class changes.

One per location.
Each place of business needs its own qualified individual on duty, so a shop with two locations lists two. Those names should match your policy.
Scope, not insurance.
The Board names no bond or policy for the license, and comp turns on how many people you regularly employ. The class changes the work we quote.

good to know.

Straight answers on North Carolina plumbing license classes.

What are the plumbing license classes in North Carolina?

The State Board licenses plumbing in four classes. P-I covers water and drain, waste and vent systems in any building. P-II covers the same systems in single-family detached homes only. RLP covers exterior sewer and water service piping and water filtration, and FP covers fuel gas piping from the source to the appliance.

Can a P-II plumber work on commercial buildings?

Not under the Board’s definition. P-II covers water and drain, waste and vent systems in single-family detached dwellings only. P-I covers the same systems in any building, residential, commercial or industrial. Whether a townhouse, duplex or small office fits is a question for the Board, and we point you there rather than guess.

Does gas piping need a separate license in North Carolina?

Yes. Fuel piping is its own class, FP, covering fuel gas piping from an approved source to any system, equipment or appliance inside the premises. Plumbers who run gas lines hold it alongside their plumbing class. Carriers ask about gas work too, because those claims look different from a water leak.

Sources: NC State Board of Examiners of Plumbing, Heating, and Fire Sprinkler Contractors. Last reviewed September 2026.

Insurance words, in plain English: waiver of subrogation · certificate of insurance · additional insured · primary and noncontributory · hold harmless agreement · contractual liability · per-project aggregate · completed operations