NC Building Exam Study Guide (2026)
Everything the North Carolina Building Contractor Exam tests, topic by topic: what each section covers, the facts that come up most, and how to study it. Pair it with the free 15-question practice test.
The exam at a glance
| Questions | 90 trade questions + 40-question Business & Law section |
|---|---|
| Time | 200 minutes (trade) + 90 minutes (Business & Law) |
| Passing score | 70% on each part |
| Format | Open book (approved references) |
| Licensing body | NC Licensing Board for General Contractors (NCLBGC) |
| Test provider | PSI |
Mind map: the whole exam on one screen
1. NC Licensing Law and Limits
This topic covers who needs a North Carolina general contractor license, the three license limitations and the penalties for working without one. It is the core of the Business & Law section, so expect several questions on dollar thresholds and exemptions.
Key facts
- A general contractor license is required when the cost of the undertaking is $40,000 or more (G.S. 87-1(a)).
- Limited license: single projects up to $750,000. Intermediate: up to $1,500,000. Unlimited: no cap. Values exclude land and ancillary land costs (G.S. 87-10(a1)).
- The Building classification covers private, public, commercial, industrial and residential buildings of all types (G.S. 87-10(b)(1)).
- Owner exemption: an owner building solely for their own occupancy is presumed not to qualify if they do not occupy it for at least 12 months after completion (G.S. 87-1(b)(2)).
- If the qualifier leaves, the license stays in effect 90 days, but the company may not bid on or take new contracts until reinstated (G.S. 87-10(c1)).
- Licenses expire January 1 after issuance or renewal and become invalid 60 days later unless renewed (G.S. 87-10(e)).
- Unlicensed contracting, using an expired or revoked license, or an architect or engineer recommending an unlicensed contractor is a Class 2 misdemeanor (G.S. 87-13).
Flashcards
Exam tip: Project limits are per single project and exclude land costs, so read whether the question's dollar figure includes the land before picking a license level.
2. Board Rules and Continuing Ed
This topic covers the Board's financial requirements for each license limitation and the annual continuing education rules. Questions test exact dollar figures for working capital, net worth and surety bonds, and CE hours and deadlines.
Key facts
- Limited: working capital of at least $17,000 or net worth of at least $80,000 (21 NCAC 12A .0204(b)).
- Intermediate: working capital of at least $75,000, shown by an agreed-upon procedures report or audited financial statement (21 NCAC 12A .0204(c)).
- Unlimited: working capital of at least $150,000, shown by an agreed-upon procedures report or audited financial statement (21 NCAC 12A .0204(d)).
- Surety bond in lieu of financials: $175,000 Limited, $500,000 Intermediate, $1,000,000 Unlimited, with the State of North Carolina as obligee (21 NCAC 12A .0204(e)).
- Building, Residential and Unclassified qualifiers need 8 hours of CE each year: a 2-hour mandatory Board course plus 6 elective hours (G.S. 87-10.2(a)-(b)).
- Up to 4 elective hours may carry forward to the next year (G.S. 87-10.2(b)).
- CE runs January 1 to November 30, followed by a 90-day grace period. Returning from inactive status takes 8 hours within 2 years or 16 hours after 2 years (G.S. 87-10.2(g)-(h)).
Flashcards
Exam tip: Only the Limited license offers a net worth option ($80,000); Intermediate and Unlimited must show working capital or post a bond.
3. Mechanics Liens and Lien Agents
This topic covers how contractors, subs and suppliers secure payment with a claim of lien on real property in North Carolina. NC deadlines and the lien agent system are unique, so they are frequent exam questions.
Key facts
- A claim of lien on real property must be filed no later than 120 days after the last furnishing of labor or materials (G.S. 44A-12(b)).
- Claims of lien are filed with the clerk of superior court in each county where the property is located (G.S. 44A-12(a)).
- A suit to enforce the lien must be started no later than 180 days after the last furnishing (G.S. 44A-13(a)).
- A claim of lien may not be amended. It may be cancelled and a new one substituted within the original filing time (G.S. 44A-12(d)).
- A waiver of lien rights given in exchange for the award of a contract is against public policy and unenforceable (G.S. 44A-12(f)).
- The owner must designate a lien agent for improvements costing $40,000 or more, except for an owner-occupied existing single-family home (G.S. 44A-11.1(a)).
- A potential lien claimant should serve a Notice to Lien Agent no later than 15 days after first furnishing to protect full rights (G.S. 44A-11.2).
Flashcards
Exam tip: Both lien clocks (120 days to file, 180 days to sue) start from the last furnishing, not the date of the contract or the date payment was due.
Test yourself on these topics
Take the free 15-question NC Building test, then save your results to unlock your Readiness Score and the mistakes bank.
4. Bonds, Retainage and Prompt Pay
This topic covers payment and performance bonds on public projects, retainage limits and the deadlines for paying subcontractors. These rules come from G.S. Chapter 44A, Chapter 22C and G.S. 143-134.1.
Key facts
- Private projects: a contractor must pay its sub within 7 days of receiving each periodic or final payment (G.S. 22C-3).
- Late payments to subs bear interest of 1% per month or fraction, starting on the 8th day (G.S. 22C-5).
Flashcards
Exam tip: Watch for who the owner is: State agencies and UNC use a $500,000 bond trigger, while counties and cities use $300,000.
5. Sedimentation and Erosion Control
This topic covers the NC Sedimentation Pollution Control Act of 1973, which the licensing law requires every candidate to know. Questions focus on the one-acre plan trigger, buffer zones, ground cover timing and penalties.
Key facts
- Land-disturbing activity of more than 1 acre needs an approved erosion and sedimentation control plan (G.S. 113A-57(4)).
- The plan must be filed 30 or more days before starting work and approved before work begins, unless filed under an express permit program (G.S. 113A-57(4)).
Flashcards
Exam tip: The plan trigger is more than one acre, so a disturbance of exactly one acre does not require a plan under the state statute.
6. Underground Damage Prevention (811)
This topic covers North Carolina's Underground Utility Safety and Damage Prevention Act, G.S. 87-115 and following. Expect questions on notice timing, ticket life, premarking, the tolerance zone and what to do after damage.
Key facts
- Give notice to the Notification Center (NC811) at least 3 full working days before excavating or demolishing (G.S. 87-122(a)).
- Near a subaqueous facility, notice must be given 10 to 20 full working days ahead (G.S. 87-122(a)).
Flashcards
Exam tip: Count working days, not calendar days, for the 3-day notice, but count calendar days for the 28-day ticket life.
7. Construction Safety (OSHA)
This topic covers jobsite safety under OSHA's construction standards, 29 CFR 1926, which North Carolina's state OSH plan adopts. Questions focus on fall protection, excavations and ladders, with exact heights and distances.
Key facts
- Fall protection is required at 6 feet or more above a lower level (29 CFR 1926.501(b)(1)).
- Personal fall arrest anchorages must support at least 5,000 pounds per employee attached (29 CFR 1926.502(d)(15)).
Flashcards
Exam tip: Do not mix up the trench numbers: 4 feet triggers egress, 5 feet triggers a protective system, and 20 feet requires an engineer-designed system.
8. Plan Reading and Estimating
This topic covers reading scaled drawings and turning plan dimensions into material quantities. These are math questions with fixed formulas, so they are dependable points if you work carefully.
Key facts
- At 1/4 inch = 1 foot, each inch on the plan equals 4 feet. At 1/8 inch = 1 foot, each inch equals 8 feet.
- Cubic yards = length x width x thickness, all in feet, divided by 27.
Flashcards
Exam tip: Convert inches to feet before multiplying for volume, because mixing units is the most common estimating error.
How to pass
- Licensing rules make up about half of the Business & Law section. Learn the limitations and thresholds first.
- If you already passed NASCLA, you only need the Business & Law section for the Building classification.
- NC lien deadlines (120 and 180 days) differ from most states. Don't mix them up with Florida's or California's.
Frequently asked questions
How long should I study for the NC Building exam?
Most working candidates need 4 to 8 weeks at 45 to 60 minutes a day. Book your exam once your Readiness Score has stayed at 80 or higher for about a week.
Is the NC Building exam open book?
Open book (approved references). Check the current candidate information bulletin from NC Licensing Board for General Contractors (NCLBGC) for the approved reference list and tabbing rules.
What score do I need to pass the NC Building exam?
70% on each part. The exam has 90 trade questions + 40-question business & law section and a time limit of 200 minutes (trade) + 90 minutes (business & law).
What are the most tested topics?
The outline covers nc licensing law and limits, board rules and continuing ed, mechanics liens and lien agents, bonds, retainage and prompt pay, sedimentation and erosion control, underground damage prevention (811), construction safety (osha), plan reading and estimating. Use the free practice test to see which ones you need most.
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Summarized from official candidate information and the statutes, codes and regulations cited, checked October 2026. Confirm current requirements with NC Licensing Board for General Contractors (NCLBGC).