1.1 NC Plumbing Licensing, Board Rules & Exam Structure
Key Takeaways
- North Carolina issues no journeyman plumbing licence: the Board licenses Plumbing Contractor Class I (all structures) and Class II (single-family detached dwellings only), Plumbing Technician Class I and Class II, and the Restricted Limited Plumbing Contractor.
- Plumbing Contractor applicants must document 4,000 hours of hands-on experience (up to one-half may be academic or technical training); Class I technicians need 3,000 hours and Class II technicians 2,500 hours.
- The Plumbing Contractor examination is delivered by PSI as a 4.0-hour technical exam plus a 1.5-hour Business and Law exam; 21 NCAC 50 .0305 requires a grade of 70 on a 100-point maximum to pass.
- Licence by examination costs $150 ($75 application plus $75 examination, nonrefundable); the $150 annual licence fee is due within 45 days of the result notice, and all licences expire on 31 December.
- Every exam is open-book against the Board's Book Reference List, but highlighting is the only alteration allowed: no writing, underlining, indexing, homemade tabs, printed PDFs, or loose paper are permitted in the test room.
1.1 NC Plumbing Licensing, Board Rules & Exam Structure
Quick Answer: Plumbing contracting in North Carolina is regulated by the State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors under NCGS Chapter 87, Article 2 and Title 21, Chapter 50 of the North Carolina Administrative Code (21 NCAC 50). North Carolina does not issue a journeyman plumber licence. The Board issues Plumbing Contractor Class I (all structures), Plumbing Contractor Class II (single-family detached dwellings only), Plumbing Technician Class I and Class II, and the Restricted Limited Plumbing Contractor. Contractor applicants document 4,000 hours of hands-on experience (up to one-half may be academic or technical training), then sit a PSI computer-based, open-book examination: a 4.0-hour technical exam plus a 1.5-hour Business and Law exam. 21 NCAC 50 .0305 requires a grade of 70 on a 100-point maximum. Licence by examination costs $150 ($75 application + $75 examination), the annual licence fee is $150, and all licences expire on 31 December.
Statutory Framework: NCGS Chapter 87, Article 2 & 21 NCAC 50
The practice of plumbing contracting in North Carolina is strictly regulated to protect public health, safety, and sanitation. The regulatory hierarchy consists of statutory law enacted by the General Assembly and administrative rules adopted by the licensing board:
- North Carolina General Statutes (NCGS) Chapter 87, Article 2: The statutory law establishing the State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors, defining licensing powers, qualifications, fees, enforcement mechanisms, and criminal penalties for unlicensed contracting.
- Title 21, North Carolina Administrative Code, Chapter 50 (21 NCAC 50): The administrative regulations governing application procedures, experience credit, passing grade, licence renewal, supervision, permits, and disciplinary procedure.
- North Carolina State Building Code: Plumbing Code (NCPC): The technical standard, based on the International Plumbing Code (IPC) with North Carolina amendments, enforced by local building inspection departments across all 100 North Carolina counties.
Identity Trap — There Is No NC Journeyman Licence. Search results and out-of-state prep material frequently advertise a "North Carolina journeyman plumber" credential. It does not exist. Every plumbing credential in North Carolina is issued by this Board at the contractor or technician level, and a technician may never contract work in their own name (21 NCAC 50 .0403(c)).
North Carolina Plumbing License Classifications
The Board issues distinct classifications based on building occupancy and the licensee's operational role. Understanding the legal boundary of each licence is a heavily tested topic.
| License Classification | Authorized Scope of Work | Experience Requirement | Exam Parts Required |
|---|---|---|---|
| Plumbing Contractor, Class I | Commercial, residential, industrial and institutional buildings — no occupancy restriction. | 4,000 hours | Technical (4.0 h) and Business & Law (1.5 h) |
| Plumbing Contractor, Class II | Single-family detached residential dwellings only. | 4,000 hours | Technical (4.0 h) and Business & Law (1.5 h) |
| Plumbing Technician, Class I | Performs and supervises unrestricted plumbing work as a full-time employee of a Plumbing Contractor. Cannot contract. | 3,000 hours | Class I technical and Board laws and rules parts (4.0 h). No business part. |
| Plumbing Technician, Class II | Performs and supervises single-family detached residential work as a full-time employee of a Plumbing Contractor. Cannot contract. | 2,500 hours | Class II technical and Board laws and rules parts (4.0 h). No business part. |
| Restricted Limited Plumbing Contractor | Exterior building sewer piping, exterior water service two inches and smaller, exterior backflow preventers on that service, and water filtration components (21 NCAC 50 .0518). | 1,500 hours | Technical (2.0 h) and Business & Law (1.5 h) |
| Fuel Piping Contractor | Fuel piping installations requiring a Board licence. | 2,000 hours | Technical (2.0 h) and Business & Law (1.5 h) |
Exam Trap: A Class II Plumbing Contractor is legally restricted to single-family detached dwellings. A Class II licensee cannot pull a permit or install plumbing in a two-family duplex, an attached townhouse, a multi-family building, or a commercial strip mall. Class I covers commercial, residential, industrial and institutional buildings without that restriction.
The Two Ladders Between Technician and Contractor. Under 21 NCAC 50 .0301(h)–(i), a technician licence is earned by passing the technical and Board laws and rules parts. A candidate who then meets the contractor experience requirement may upgrade to the matching contractor licence by passing only the business portion. Conversely, an applicant for a Class I or Class II contractor licence who passes the technical portion but fails the business portion may request the corresponding Technician licence on the strength of the technical pass.
Experience Verification & Eligibility
Experience is documented on Board forms (1-B, 1-C, 1-D), verified by notarised signature of current or former employers, and supported by W-2s, 1099s, a Social Security earnings statement, or firm tax returns for self-verification.
- Contractor — 4,000 hours: Two years of full-time experience in the installation, maintenance, service, or repair of plumbing systems, whether or not a licence was required for the work performed (21 NCAC 50 .0306(b)).
- Technician — 3,000 hours (Class I) or 2,500 hours (Class II): Same qualifying activities, related to the category sought (21 NCAC 50 .0306(i)).
- Restricted Limited Plumbing Contractor — 1,500 hours (21 NCAC 50 .0306(j)).
- Education Credit — up to one-half: Coursework through a college, university, community college, or technical institute that is part of a certificate, diploma, or degree programme and directly related to the licence sought. Each approved semester hour earns 66.66 hours of experience credit.
- Criminal record report: Every applicant must obtain a nationwide criminal background report through CastleBranch and submit a printed copy with the application. Answering falsely can be treated as fraud in obtaining a licence under G.S. 87-23 and G.S. 87-25.
- Processing: Application review typically takes four to six weeks; approval triggers an email from PSI with scheduling instructions.
PSI Examination Architecture & Strategy
All Board examinations are computer-based and administered by PSI Services LLC. Testing runs year-round at seven North Carolina centres: Asheville, Charlotte, Fayetteville, Greenville, Raleigh, Wilmington, and Winston-Salem. Out-of-state PSI centres may be approved on request.
Examination Logistics
| Item | Current requirement |
|---|---|
| Format | Computer-based, open-book, multiple choice, one question per screen; answers may be revised until time expires. |
| Plumbing Contractor duration | 4.0 hours technical plus 1.5 hours Business and Law (taken as separate exams). |
| Passing grade | 70 on a maximum obtainable grade of 100 points (21 NCAC 50 .0305). Not a scaled score. |
| Number of questions | Not published by the Board or by PSI. Prepare to the reference books and the time limit, not to a question count. |
| Fee | $150 for licence by examination — a $75 application fee plus a $75 examination fee, nonrefundable (21 NCAC 50 .1101(c)). |
| Scheduling window | The approval letter states a 90-day authorisation period in which the exam must be taken. |
| Rescheduling | Cancel or reschedule with PSI at least two days before the appointment or forfeit the fee. |
| Score reporting | Result is delivered immediately at the test centre as PASS or FAIL; the report can be printed from the PSI account. |
| Retake | The Board requires a 90-day wait after a failure, plus a Re-Examination Application and a new fee. |
| Licence activation | The licence fee must be paid within 45 days of the result notice or the applicant must retest (21 NCAC 50 .1101(c)). |
Business and Law Waiver. The Business and Law exam is not required if the applicant already holds a currently active contractor licence with this Board and passed the Board's Business and Law exam after August 2003. Confirm eligibility with the Board's exam coordinator — the waiver is not automatic.
South Carolina Technical Waiver. North Carolina has no licence reciprocity. It maintains a technical-examination waiver with South Carolina only (for example, SC Residential Plumbing maps to NC Plumbing Class II; SC Commercial Mechanical Plumbing (PB) maps to NC Plumbing Class I). The waiver covers only the technical section; every applicant must still meet NC experience requirements and pass the NC Business and Law exam.
Approved Reference Books — Plumbing Contractor, Class I
The Board publishes a Book Reference List, and only the books listed for the classification you were approved to take may be used in the exam room. For Plumbing Class I these are:
- NC State Building Code: Administration Code and Policies, 2018 edition
- NC State Building Code: Plumbing Code, 2018 edition
- NC State Building Code: Fuel Gas Code, 2018 edition
- NC State Building Code: Residential Code, 2018 edition
- Laws & Rules book issued by the Board (2025 or 2026 edition) — G.S. Chapter 87, Article 2 and 21 NCAC 50
- Business & Project Management for Contractors, 6th or 7th edition, North Carolina Plumbing, Heating and Fire Sprinkler Contractors' edition
Other classifications use a subset: Class II uses items 1, 4, 5 and 6; Restricted Limited Plumbing uses 1, 2, 4, 5 and 6; Plumbing Technician uses 1, 2, 3, 4 and 5 (no business book, because there is no business part).
Code Edition Alert (current as of the Board's 1 June 2026 update). All plumbing, heating, fuel piping and fire sprinkler examinations remain based on the 2018 editions of the North Carolina codes. The 2024 North Carolina State Building Code has been postponed repeatedly; the earliest possible effective date is 1 May 2027, and that date is not set. Do not study from a 2024 code book for this exam.
Reference-Material Rules — Where Candidates Get Turned Away
These rules are enforced at check-in, and violating them costs the exam appointment:
- Allowed: hard-bound, spiral-bound, or ring-bound editions in original published condition; commercially available non-removable index tabs permanently attached to the pages; ICC "Turbo Tabs" are the only approved loose-leaf full-page inserts.
- Highlighting is the only alteration permitted. No printed or written text, notes, formulae, or underlining may be added before or during the exam.
- Prohibited: printed PDF versions of reference books; homemade or DIY tabs; any other tabbed divider pages; books with whited-out markings; any additional paper, loose, taped, stapled, or adhered.
- Some questions test field experience and trade practice, so the exam is not limited to material contained in the listed books. OSHA 29 CFR 1926 is not on the reference list and cannot be brought in, but jobsite safety knowledge is still fair game.
- Personal electronics — phones, smart watches, tablets — must be left in secure storage. Arriving with unauthorised materials means a 90-day wait before rescheduling.
Supervisory Duties, Active Employment & Prohibited Practices
North Carolina law imposes strict supervisory requirements on licensed contractors.
General Supervision & Bona Fide Employment
Under 21 NCAC 50 .0505, the licensee whose qualification the licence is based on must exercise general supervision and meet the Board's standard of competence over all work falling within that qualification. Under 21 NCAC 50 .0406(a), the licensed contractor is responsible for all proposals, bids, contracts, supervision, code compliance, and for making sure permits and inspections are obtained.
The 1,500-Hour Active Employment Rule (21 NCAC 50 .0404)
Every business location, branch, or facility from which licensed work is solicited, proposed, negotiated, dispatched, or carried out must have on duty — for the lesser of 1,500 hours annually or all hours during which those activities occur — at least one individual who:
- holds a contractor licence in the classification required for the work,
- has that licence listed in the name of that firm at that location,
- is engaged in the firm's work at the location or at its job sites, and
- has authority to make, modify, terminate, and set the terms of contracts.
Evidence of compliance is required as a condition of renewal, and falsification is treated as fraud in obtaining a licence. If a qualifier holds employment elsewhere, the firm may not perform licensed work during the hours that qualifier is committed to the other employer (.0404(b)).
License "Renting" or "Lending" Prohibition
21 NCAC 50 .0403(a) is blunt: a licensed contractor or technician shall not permit the use of his licence by any other person. Under .0402(b) a contractor may not allow a permit to be pulled, or the licence number to appear on a permit, except for work the licensee or the licensee's employees perform under general supervision, under an executed contract, and for which the licensee receives all contractual payments. Violations are prosecuted as fraud, gross negligence, or misconduct under G.S. 87-23, and unlicensed practice by the borrower is a Class 2 misdemeanor under G.S. 87-25.
Multiple Licences (21 NCAC 50 .0405)
A licensee may qualify only the business location from which the majority of his or her work is carried out, and may be listed on only one contractor licence at a time, whether that licence is in the individual's name or a firm's name. Limited exceptions exist for the Fire Sprinkler Maintenance Technician, Private Educational Institution Technician, and State and local government technician qualifications.
Annual License Maintenance & Business Identification
1. Annual Renewal Deadline
Under G.S. 87-22, all licences expire on the last day of December in each year following issuance or renewal. The annual licence fee for plumbing, heating, and fuel piping contractor licences is $150 (21 NCAC 50 .1102(a)); it drops to $75 for a qualifier listed as the second or subsequent individual on a firm licence, and technicians listed under a licensed contractor pay $75. An expired licence may be reinstated within three years on written request and payment of the current fee plus the unpaid prior years and the G.S. 87-22 processing fee (21 NCAC 50 .0409). Failure to renew within three years after expiration triggers re-examination.
2. No Continuing Education Requirement
North Carolina's mandatory continuing-education rule for this Board — 21 NCAC 50 .1401 — was repealed effective 31 December 2012, and the Board confirms that the mandatory CE requirement was eliminated on that date. The Board still encourages licensees to pursue education voluntarily, but CE hours are not a condition of renewal for a plumbing contractor or technician licence. Beware of prep material that recites an annual CE hour count for this Board; it is describing another state or another North Carolina board.
3. Licence Number Display (21 NCAC 50 .0406(c))
There is no vehicle-lettering rule in 21 NCAC 50 — the rule frequently misquoted for that purpose, .0512, actually defines which employees are exempted from licensure. What the rule does require is that the contractor licence number and the qualification of the firm be displayed on firm contracts, proposals, permit applications, and telephone yellow-page advertising. Some municipalities impose their own signage or registration conditions; those are local requirements, not Board rules.
4. Notification Duties
- Address, telephone, or location change: notify the Board within 30 days of the change from what appears on the last renewal invoice (21 NCAC 50 .0408(c)).
- Qualifier leaving a firm: if a licensee terminates the association, both the firm and the licensee must notify the Board within 30 days on the Board form (21 NCAC 50 .0407(c)). The licensee may then reinstate the personal licence or move the qualification to another firm on compliance with G.S. 87-26.
- Contract assumption: a contract and the supervision duty may be assumed by another licensed contractor only on written notice to, and approval by, the property owner and the local inspection department (21 NCAC 50 .0406(b)).
Which statement correctly describes continuing education and licence-number display for a North Carolina plumbing contractor licensed by the State Board of Examiners of Plumbing, Heating & Fire Sprinkler Contractors?
A plumbing contractor holding a valid Class II Plumbing Contractor (P-II) license in North Carolina is legally authorized to pull permits and perform plumbing work on which of the following projects?
An applicant applying to sit for the North Carolina Plumbing Contractor Class I examination has completed an accredited two-year associate degree in plumbing technology. What is the maximum educational credit the Board may apply toward the 4,000-hour experience requirement?
A candidate approved for the North Carolina Plumbing Contractor Class I examination is packing reference books for the PSI test centre. Which set of materials complies with the Board's reference-material rules?