1.4 Permits, Plan Review, Required Inspections & Code-Mandated Tests

1.4 Permits, Plan Review, Required Inspections & Code-Mandated Tests

Quick Answer: Under 21 NCAC 50 .0402(a) the licensed contractor — not the owner, not the general contractor — must ensure a permit is obtained from the local code enforcement official before commencing any work requiring a Board licence, and must ensure a request for final inspection is made within 10 days of the earlier of the system being made operational or placed in service. A plumbing permit is not required to replace a water heater in a one- or two-family dwelling under the circumstances in G.S. 153A-357 and G.S. 160A-417. Rough DWV piping is tested with a 10-foot head of water or 5 psi of air held 15 minutes with no more than a 1-inch mercury drop; water distribution piping is tested at not less than the working pressure of the system (NCPC 312.5); the building sewer is tested with a 10-foot head of water held 15 minutes.

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Who Owns the Permit Obligation in North Carolina

Permit responsibility is a licence obligation, not merely a code obligation. That distinction is why this material appears on both the technical exam and the Business and Law exam.

21 NCAC 50 .0402 states the duty in four parts:

1. (a) Permit before work. The licensed contractor shall ensure a permit is obtained from the local code enforcement official before commencing any work for which a Board licence is required. The same paragraph requires that a request for final inspection be made — by the licensee, the general contractor, or the owner — within 10 days of the earlier of the system being made operational or placed in service, absent agreement with the owner and the local code enforcement official. Absent such agreement, the licensee is not relieved of responsibility to arrange inspection until a certificate of compliance (or equivalent) is obtained, or until the licensee has clear and convincing evidence of the effort to obtain one.
2. (b) No permit lending. A licensed contractor shall not allow a permit to be obtained, or the licence number to appear on a permit, except for work the licensee or the licensee's employees perform, over which the licensee or a properly licensed technician provides general supervision until completion, under an executed contract with the licensed general contractor or property owner, and for which the licensee receives all contractual payments.
3. (c) Water heater exemption. A plumbing permit is not required for replacement of a water heater in a one- or two-family dwelling under the circumstances set out in G.S. 153A-357 (counties) or G.S. 160A-417 (cities).
4. (d) Discipline. Failure to comply with the permit and inspection obligations of the rule is considered by the Board as evidence of incompetence or misconduct in the use of the licence.

Exam Trap — "Water heaters always need a permit." That statement is false in North Carolina for one- and two-family dwellings within the statutory circumstances. Note the limits, though: the exemption is for a replacement water heater in a one- or two-family dwelling, and the statutory conditions include limits on the amount of water distribution piping installed to reconnect the heater. A new heater in a commercial building, an added heater, or a repipe is not exempt.

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Plan Review, Design Documents & the Administration Code

The NC State Building Code: Administration Code and Policies (2018 edition — reference book "A" on the Board's list) governs permits, plan review, inspections, certificates of compliance, and appeals for every trade.

• Construction documents. Plumbing permit applications for anything beyond small residential work are submitted with plans, riser or isometric diagrams, fixture schedules, and equipment cut sheets. Where a design professional is required by G.S. 83A or G.S. 89C, the drawings carry that professional's seal.
• Approved plans on site. One set of approved documents, stamped by the plan reviewer, must remain on the job site and available to the inspector. Field changes that deviate from approved plans require a revision or an amended permit.
• Permit expiration. A permit generally becomes invalid if work is not commenced within six months of issuance or if work is suspended or abandoned for six months. Local jurisdictions may set additional conditions — always read the permit card.
• Alternative materials and methods. Where a proposed material, design, or method is not specifically prescribed, the code official may approve it on evidence that it is at least equivalent in quality, strength, effectiveness, fire resistance, durability, and safety. Record that approval in writing; a verbal "the inspector said it was fine" is worthless at final.

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The Inspection Sequence for a Plumbing Installation

North Carolina inspection departments schedule plumbing work in a predictable order. Terminology varies slightly between jurisdictions — some combine "rough-in" and "top-out," some list them separately — so read the local permit card rather than assuming a fixed national list.

graph TD
    A["Open Trench / Underground<br/>Building sewer, water service, under-slab DWV<br/>Inspected in the open trench before backfill or pour"] --> B["Rough-In / Top-Out<br/>DWV and water piping in framing, stacks through roof<br/>Before insulation, wallboard, or concealment"]
    B --> C["Final Inspection<br/>Fixtures set and trimmed, water heater operating,<br/>backflow devices installed and tested"]
    C --> D["Certificate of Compliance<br/>Issued by the local code enforcement official"]

1. Open trench / underground. Inspected after the full length and depth of the trench is opened and the piping is placed, before backfill or a concrete pour. All joints stay exposed. This is where slope, bedding, pipe material, separation from the water service, and sleeve details are verified.
2. Rough-in / top-out. Inspected after DWV and water distribution piping is installed in the framing and vent stacks penetrate the roof, but before insulation, wallboard, plaster, or any concealment. The system must be under test when the inspector arrives — an untested rough is a failed rough.
3. Final. Inspected after fixtures, faucets, appliances, water heaters, and backflow preventers are set, connected, trimmed, and operational. The inspector verifies T&P discharge piping, fixture clearances, trap seals, backflow device installation and testing, cleanout access, and operation under running water.
4. Re-inspection. A failed inspection generates a correction notice and, in most jurisdictions, a re-inspection fee. Concealing work that failed or was never inspected is a licence-level problem, not just a code problem.

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Code-Mandated Tests: The Numbers You Must Recall

The test values below come from NCPC Chapter 3, Section 312 and are among the most frequently examined numbers in the entire code because they are short, precise, and easy to write questions about.

Exam Trap — Two Different 10-Foot Rules. The 10-foot head in the DWV water test is a test pressure. The instruction to exclude the topmost 10 feet of the system is a scoping rule — that upper portion is proved when the section below is tested from a higher point. Questions often present both in the same stem to see whether the candidate conflates them.

Exam Trap — Air Test Units. Five psi and ten inches of mercury are alternative expressions of the same acceptance threshold in the DWV air test. A distractor that offers "5 inches of mercury" or "10 psi" is testing whether you memorised the pairing rather than a single number.

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Practical Consequences for the Licensee

• Schedule the final within 10 days. The .0402(a) clock starts when the system is made operational or placed in service, whichever comes first — not when the customer pays, and not when the general contractor gets around to calling.
• Document your effort. If the owner or general contractor blocks access and the inspection cannot be arranged, the rule preserves the licensee's position only where there is clear and convincing evidence of the effort. Keep dated emails, voicemails, and inspection-request confirmations.
• Never pull a permit for work you are not performing and not being paid for. That single act supplies the Board with a complete .0402(b) violation on the face of the permit record.
• A certificate of compliance closes the loop. Until it is issued, the licensee remains responsible for arranging the inspection.