North Carolina Plumbing Class I Contractor Exam Book Package

Prepare for the North Carolina Plumbing Class I Contractor examination with a complete reference-book package covering plumbing systems, fuel gas requirements, residential construction, code administration, licensing laws, business practices, and project management.

The North Carolina Plumbing Class I license applies to plumbing work in commercial, residential, industrial, and institutional buildings. Candidates preparing for this classification need a working understanding of water-distribution systems, sanitary drainage, venting, fixtures, storm drainage, fuel gas piping, residential code provisions, permits, inspections, contractor regulations, and business responsibilities.

This package includes the six reference books identified for the Plumbing Class I Contractor examination: the 2018 North Carolina Administrative Code and Policies, 2018 North Carolina Plumbing Code, 2018 North Carolina Fuel Gas Code, 2018 North Carolina Residential Code, the Board’s Laws & Rules 2026 Edition, and the seventh edition of the North Carolina contractor business, law, and project management reference.

Each book serves a different purpose during preparation. The Plumbing Code addresses technical requirements for plumbing systems. The Fuel Gas Code supports questions involving gas piping, appliance connections, combustion air, venting, and related safety provisions. The Residential Code contains plumbing and construction requirements for qualifying residential buildings, while the Administrative Code and Policies explains code administration, permits, inspections, approvals, and enforcement procedures.

The Board’s Laws & Rules reference addresses licensing authority, contractor classifications, professional conduct, license requirements, and Board regulations. The business, law, and project management book supports the separate business portion of the contractor examination with material involving contracts, estimating, financial management, project administration, employment practices, safety, and risk management.

Because the North Carolina Plumbing Class I Contractor examination is open book, success depends on more than technical knowledge. Candidates must also know which reference applies to a question, how the books are organized, and where commonly tested requirements can be found. Repeated navigation practice helps turn a large code library into a useful exam-day resource.

This book package is suited for candidates who want the required references together for focused study and examination preparation. It supports both the technical plumbing portion and the contractor business and law portion of the licensing examination.

What You Get

Exam Details

The North Carolina Plumbing Class I Contractor licensing process includes a technical Plumbing Contractor examination and a Business and Law examination. The technical plumbing examination allows four hours. The Business and Law examination allows one and one-half hours.

The Business and Law examination may not be required for an applicant who already holds a currently active contractor license issued by the same Board and passed the Board’s Business and Law examination after August 2003. Candidates seeking an exemption must meet the Board’s applicable requirements.

The technical examination may address plumbing-code administration, water supply and distribution, sanitary drainage, venting, fixtures, fixture fittings, water heaters, indirect waste, special waste, storm drainage, traps, interceptors, separators, testing, inspections, residential plumbing, and fuel gas systems.

Water-supply preparation should include materials, sizing, pressure, distribution piping, valves, backflow protection, cross-connection control, service piping, fixture supply, and protection against contamination. Candidates should understand how code requirements change according to the type of system and installation condition.

Drainage preparation may involve drainage fixture units, pipe sizing, slope, cleanouts, changes in direction, building drains, building sewers, branch piping, stacks, horizontal drainage, sumps, ejectors, and connections to approved disposal systems.

Venting subjects may include individual vents, common vents, wet venting, circuit venting, stack venting, vent stacks, relief vents, air admittance valves, vent sizing, developed length, termination, and protection of the trap seal.

Fixture questions may involve minimum fixture requirements, installation, accessibility, spacing, supports, connections, water closets, lavatories, sinks, showers, bathtubs, drinking fountains, service sinks, food-service fixtures, and specialized plumbing equipment.

Fuel gas preparation may include pipe sizing, approved materials, pressure limitations, shutoff valves, appliance connections, regulators, testing, combustion air, venting systems, chimneys, clearances, equipment installation, and protection of gas piping.

The Class I examination also requires familiarity with administrative and licensing responsibilities. Candidates should understand the roles of contractors, permit holders, code officials, inspectors, property owners, and the licensing Board.

The separate business examination addresses the responsibilities of operating a contracting business. Study areas may include business organization, contracts, bidding, estimating, financial management, project scheduling, employment practices, insurance, safety, recordkeeping, and risk management.

Open Book Test

The North Carolina Plumbing Class I Contractor examination is an open-book test. Candidates are required to bring the approved reference books assigned to their examination classification. Only the publications authorized for the examination may be taken into the testing room.

The six books included in this package correspond to the references identified for the Plumbing Class I Contractor examination. Candidates should use the same books during preparation so they become familiar with chapter organization, indexes, definitions, tables, appendices, and cross-references.

The Board permits original hard-bound, spiral-bound, or ring-bound reference materials. Commercially available, permanently attached index tabs may be used. Highlighting is permitted, but written notes, formulas, underlining, calculations, added text, homemade tabs, unauthorized divider pages, loose paper, and printed PDF copies are not allowed.

Open-book testing rewards preparation and familiarity. Candidates should not expect to read entire chapters during the examination. A better approach is to recognize the subject, select the proper book, locate the governing section, and confirm the answer by reading the surrounding language.

For example, a question about drainage pipe sizing belongs in the Plumbing Code, while a question about gas-pipe sizing belongs in the Fuel Gas Code. A permit or inspection question may require the Administrative Code and Policies. A licensing or professional-conduct question should direct the candidate to the Board’s Laws & Rules.

Questions about contracts, estimating, project supervision, financial controls, or business organization may require the business, law, and project management reference. Residential plumbing questions may require the Residential Code rather than the general Plumbing Code.

Before test day, candidates should inspect every reference and confirm that it complies with the current examination rules. A book that contains prohibited markings, loose material, unauthorized tabs, or copied pages may not be accepted in the testing room.

Licensing Steps

1. Confirm the Plumbing Class I classification. Class I applies to plumbing work in commercial, residential, industrial, and institutional buildings.
2. Obtain the required reference books. Applicants must have the current books listed for the examination when submitting the application and should be prepared to test using those references.
3. Document the required experience. Plumbing Class I Contractor applicants must provide verified documentation of qualifying hands-on plumbing experience.
4. Complete the examination application. Submit the required forms and identify Plumbing Class I as the classification sought.
5. Obtain the required background report. Follow the Board’s current instructions for submitting the nationwide criminal background record report.
6. Submit experience verification. Provide the applicable employer or experience forms documenting installation, maintenance, service, or repair work.
7. Submit the completed application package. Include all required forms, supporting records, signatures, and applicable examination fees.
8. Receive examination approval. The Board reviews the application, experience, background information, and supporting documentation before authorizing the candidate to test.
9. Schedule the examinations. Approved candidates receive instructions for scheduling with the Board’s third-party examination provider.
10. Prepare the approved books. Organize the references according to current rules for binding, highlighting, and permanent commercial tabs.
11. Complete the technical and business examinations. Candidates must satisfy the required examination components unless a valid exemption or technical waiver applies.
12. Complete license issuance requirements. Examination passage is one part of licensing. The applicant must satisfy all Board requirements before the license is issued.

State Requirements

The North Carolina State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors administers Plumbing Class I contractor licensing. The Board reviews applications, verifies experience, conducts examinations through its testing provider, issues licenses, and enforces the laws and rules governing licensed contractors.

Applicants for Plumbing Class I or Class II contractor licensing must document 4,000 hours of qualifying hands-on experience in the installation, maintenance, service, or repair of plumbing systems. The experience must be supported by the documentation required in the application process.

Approved education may account for up to 50 percent of the experience requirement. Qualifying education must be directly related to the license sought and completed through a college, university, community college, or technical institute as part of a certificate, diploma, or degree program.

Class I is the broader plumbing classification. It applies to commercial, residential, industrial, and institutional buildings. Class II is limited to plumbing work involving single-family detached residential dwellings. Candidates should apply for the classification that matches their experience and intended scope of work.

The application must be reviewed and approved before an applicant may sit for the examination. Current application requirements include experience verification, a nationwide criminal background report, required signatures, supporting documentation, and the applicable examination fee.

Applicants must possess the necessary current North Carolina codebooks, the Board-issued Laws & Rules book, and the approved business and project management reference when applying. Submitting the application indicates that the candidate has the required books and is prepared to test.

North Carolina does not offer general license reciprocity for this classification. A limited technical-examination waiver may be available when an applicant holds an eligible South Carolina commercial mechanical plumbing license, has passed the applicable South Carolina technical examination, meets North Carolina’s experience requirements, and completes the full North Carolina application process.

A technical-examination waiver does not remove the North Carolina business-examination requirement. The applicant must still satisfy the applicable business portion unless another Board-approved exemption applies.

Reference Books

• North Carolina Administrative Code and Policies, 2018 Edition
  This reference explains administrative provisions for the North Carolina State Building Code, including permits, inspections, approvals, code enforcement, duties, responsibilities, alternative materials, and construction-document requirements.
• North Carolina Plumbing Code, 2018 Edition
  This is the primary technical plumbing reference. It addresses fixtures, water supply, sanitary drainage, venting, traps, interceptors, water heaters, indirect waste, special piping, storm drainage, materials, testing, and system installation.
• North Carolina Fuel Gas Code, 2018 Edition
  This reference covers fuel gas piping, sizing, materials, pressure regulation, shutoff valves, appliance connections, combustion air, venting, chimneys, equipment installation, testing, and safety requirements.
• North Carolina Residential Code, 2018 Edition
  This reference contains residential construction and plumbing requirements applicable to qualifying one- and two-family dwellings and townhouses, including plumbing systems, fixtures, water distribution, drainage, venting, and fuel gas provisions.
• NC Board’s Laws & Rules, 2026 Edition
  This Board-issued reference contains North Carolina statutes and administrative rules governing plumbing, heating, and fire sprinkler contractors, including license classifications, examinations, professional conduct, enforcement, and contractor responsibilities.
• NASCLA Business, Law, and Project Management, North Carolina Edition, 7th Edition
  This reference supports preparation for the contractor business examination with material involving business organization, contracts, estimating, financial management, project management, employment practices, safety, insurance, and risk control.

Exam Room Approved Books

• North Carolina Administrative Code and Policies, 2018 Edition
  Used for code administration, permits, inspections, approvals, and enforcement questions.
• North Carolina Plumbing Code, 2018 Edition
  Used for technical plumbing-system, fixture, water-supply, drainage, venting, and installation questions.
• North Carolina Fuel Gas Code, 2018 Edition
  Used for fuel gas piping, appliance installation, combustion air, venting, and testing questions.
• North Carolina Residential Code, 2018 Edition
  Used for plumbing and related construction requirements in qualifying residential buildings.
• NC Board’s Laws & Rules, 2026 Edition
  Used for licensing law, Board rules, classifications, conduct, and contractor-responsibility questions.
• NASCLA Business, Law, and Project Management, North Carolina Edition, 7th Edition
  Used for the Business and Law examination covering business operations and project-management responsibilities.

Test Information and Study Materials

Build a study schedule that separates technical plumbing preparation from business and law preparation. For the technical examination, rotate among water distribution, drainage, venting, fixtures, fuel gas, residential requirements, and administration.

Practice calculations and table lookups using the Plumbing Code and Fuel Gas Code. Work on identifying fixture units, pipe sizes, developed lengths, slopes, vent requirements, gas demand, and other values that require accurate use of code tables.

Create timed lookup exercises. Choose a topic, locate the index entry, identify the correct chapter, read the governing section, and confirm whether related exceptions or definitions apply. This develops the navigation habits needed for an open-book examination.

Study definitions carefully. Plumbing, fuel gas, administrative, residential, and licensing terms may have specific meanings that differ from ordinary jobsite language. Understanding the defined term can quickly narrow the answer choices.

For the business examination, review contracts, bidding, estimating, financial statements, project scheduling, employment responsibilities, insurance, safety programs, recordkeeping, and risk management. Learn how legal and business responsibilities affect daily contractor operations.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps North Carolina Plumbing Class I Contractor candidates organize the required references into a practical preparation system.

Trade-focused study guidance connects code requirements with real plumbing work, including water distribution, drainage, venting, fixtures, gas piping, inspections, and system testing.

Practice-oriented preparation helps candidates determine which book applies to a question, locate the appropriate provision, review connected requirements, and select an answer based on the code language.

Reference-navigation practice builds familiarity with indexes, tables, definitions, chapters, and administrative provisions. This structured approach helps candidates use their open-book references more efficiently.

Business and law preparation supports the contractor portion of the licensing process by organizing subjects such as contracts, estimating, project management, financial controls, safety, employment practices, and risk management.

No book package can guarantee examination passage or license approval. Results depend on the applicant’s qualifications, experience, preparation, understanding of the references, and performance during the examinations.

Frequently Asked Questions

What books are included in this package?

The package includes the 2018 Administrative Code and Policies, Plumbing Code, Fuel Gas Code, Residential Code, the Board’s Laws & Rules 2026 Edition, and the seventh edition of the North Carolina business, law, and project management reference.

Is the North Carolina Plumbing Class I examination open book?

Yes. Candidates must bring the approved reference books assigned to the examination and ensure that the materials comply with current testing rules.

Are all six books allowed in the examination room?

Yes. The six listed references are identified for the Plumbing Class I Contractor technical and business examinations.

What work does Plumbing Class I cover?

Plumbing Class I applies to commercial, residential, industrial, and institutional buildings.

How much experience is required?

Plumbing Class I Contractor applicants must document 4,000 hours of qualifying hands-on plumbing experience. Approved education may account for up to half of the experience requirement.

How long is the technical examination?

The Plumbing Contractor technical examination allows four hours.

Is there a separate Business and Law examination?

Yes. The Business and Law examination allows one and one-half hours unless the applicant qualifies for an applicable Board exemption.

Can I write notes in the exam books?

No. Written notes, formulas, calculations, underlining, and added text are prohibited. Highlighting and approved permanently attached commercial tabs are permitted under the Board’s examination rules.

Are printed PDF codebooks accepted?

No. Printed PDF versions of the reference materials are not permitted in the examination room.

Does passing the examination automatically issue the license?

No. Examination passage is one part of the licensing process. The applicant must satisfy the Board’s experience, application, background, documentation, and license-issuance requirements.