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CSLB exam preparation
C-36 Plumbing Contractor Exam Prep
Practice plumbing estimating, rough and underground systems, finish installations, service, repair, and safety.
About this exam
CXP's C-36 bank contains 199 practice questions. Take a free diagnostic to see a sample of plumbing topics and use the result to guide further study.
The C-36 guide applies to exams scheduled on or after March 1, 2025, and lists approximate section percentages. CSLB's Examination FAQ lists a 3.5-hour exam duration but no per-trade question count. CXP's 115-question mock is not an official exam length.
- Practice bank size: 199 questions
- Mock exam size: 115 questions
Official CSLB study-guide topics
- Planning and Estimating — Approximate exam percentage: 22%
- Underground and Rough Systems — Approximate exam percentage: 22%
- Finish Plumbing Installations — Approximate exam percentage: 20%
- Service, Repair, and Remodel Plumbing Systems — Approximate exam percentage: 19%
- Safety — Approximate exam percentage: 17%
Exam topics and approximate weights: CSLB study guide.
Sample question
What type of wall fitting is legally required under the California Plumbing Code to structurally support and connect a wall-mounted water closet?
- An approved closet flange
- An approved carrier fitting
- A listed hubless closet ring
- A listed wall-hung spud fitting
Show answer and explanation
Correct answer: An approved carrier fitting
Explanation: California Plumbing Code (CPC) §402.5 requires a wall-mounted water closet to be supported by an approved concealed carrier and connected with the carrier’s approved fixture fitting. The logic is: wall-mounted bowl → concealed structural support → approved carrier fitting; therefore, the carrier fitting is the required wall fitting. A hubless closet ring and a closet flange are generally floor-outlet components, while a spud fitting connects the bowl but does not provide the required structural support by itself. Thus, only an approved carrier fitting satisfies both the support and connection requirements under CPC §402.5.
The CXP prep module
Trade exam preparation for C-36 plumbing work.
- A practice question bank and timed mock exam for this module.
- A Readiness Score to track progress by topic.
- Questions and explanations available in English and Spanish.
Law & Business + one trade
$249
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Start with a free diagnostic
Use the free diagnostic to find your starting point before choosing what to study.