CSLB Trade-Specific Regulations

Question 1

Which California license classification is required to install heating, air conditioning, and ventilation (HVAC) systems?

Accepted Answer

C-20

Answer

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?

Accepted Answer

C-36

Answer

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?

Accepted Answer

A permit and compliance with current energy efficiency standards including HERS verification

Answer

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?

Accepted Answer

California Building Standards Commission

Answer

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?

Accepted Answer

Final inspection approval from the local building department (Authority Having Jurisdiction)

Answer

New electrical service must receive final inspection approval from the Authority Having Jurisdiction (AHJ) — typically the local building or electrical department — before energization.

CSLB - Contractors State License Board Practice Test

CSLB - Contractors State License Board Practice Test

CSLB Trade-Specific Regulations