CSLB Trade-Specific Regulations 1 — Questions and Answers
Question 1: Which California license classification is required to install heating, air conditioning, and ventilation (HVAC) systems?
- C-4
- C-20 (Correct answer)
- C-36
- C-10
Correct answer: C-20
The C-20 Warm-Air Heating, Ventilating and Air-Conditioning Contractor classification is required for HVAC installation and service work in California.
Question 2: What California license classification is required for plumbing work, including installation of water supply and drain systems?
- C-34
- C-36 (Correct answer)
- C-42
- C-16
Correct answer: C-36
The C-36 Plumbing Contractor classification covers installation, alteration, and repair of plumbing systems including water, gas, and drain lines.
Question 3: Under California's Title 24 Energy Code, what is required when replacing an existing HVAC system in a residential building?
- No energy compliance required for replacements
- A permit and compliance with current energy efficiency standards including HERS verification (Correct answer)
- Only a CSLB license verification
- Owner consent only
Correct answer: A permit and compliance with current energy efficiency standards including HERS verification
California Title 24 requires permits and energy compliance verification, including HERS (Home Energy Rating System) testing, for HVAC replacements.
Question 4: Which California agency sets the state plumbing code that contractors must follow on all plumbing installations?
- CSLB
- California Department of Housing and Community Development
- California Building Standards Commission (Correct answer)
- California Department of Water Resources
Correct answer: California Building Standards Commission
The California Building Standards Commission adopts and publishes the California Plumbing Code (Title 24, Part 5) applicable to all construction.
Question 5: What is required before a licensed electrical contractor can energize new electrical service in a California building?
- Only the contractor's signature on a completion form
- Final inspection approval from the local building department (Authority Having Jurisdiction) (Correct answer)
- CSLB confirmation of licensure
- Utility company pre-approval only
Correct answer: Final inspection approval from the local building department (Authority Having Jurisdiction)
New electrical service must receive final inspection approval from the Authority Having Jurisdiction (AHJ) — typically the local building or electrical department — before energization.
Question 6: Under California law, which license classification covers roofing work including the application of waterproofing membranes and roof coverings?
- C-17
- C-29
- C-39 (Correct answer)
- C-43
Correct answer: C-39
The C-39 Roofing Contractor classification covers the installation and repair of roof systems, including waterproofing and all types of roofing materials.
CSLB Trade-Specific Regulations 1
Which California license classification is required to install heating, air conditioning, and ventilation (HVAC) systems?