California Contractor License Classifications (CSLB Guide)
This page explains the different California contractor license classifications issued by the CSLB, including Class A, Class B, and C-classification licenses. Understanding which license type you need is a critical first step before applying, preparing for the exam, or enrolling in a contractor license course.
California Contractor License Classifications (CSLB Guide)
This page explains the different California contractor license classifications issued by the CSLB, including Class A, Class B, and C-classification licenses. Understanding which license type you need is a critical first step before applying, preparing for the exam, or enrolling in a contractor license course.
Who Needs to have a
Contractor License in California?
In California, any individual or business performing construction work valued at $500 or more—including labor and materials—must hold a valid contractor license issued by the CSLB (Contractors State License Board). This requirement applies to independent contractors, self-employed workers, and anyone offering construction services for compensation.
If you plan to advertise, bid, or perform construction work legally in California, obtaining the correct CSLB license classification is required before starting any job.
CSLB California Contractor
License Requirements
According to the Contractors State License Board, applicants must meet the following minimum requirements to qualify for a California contractor license:
- At least 4 years of full-time experience in your specific trade within the last 10 years
- A valid Social Security Number or ITIN
- Must be 18 years of age or older
Meeting these requirements is the first step toward applying for a Class A, Class B, or C-classification contractor license in California.
Who Needs to have a Contractor License in California?
In California, any individual or business performing construction work valued at $500 or more—including labor and materials—must hold a valid contractor license issued by the CSLB (Contractors State License Board). This requirement applies to independent contractors, self-employed workers, and anyone offering construction services for compensation.
If you plan to advertise, bid, or perform construction work legally in California, obtaining the correct CSLB license classification is required before starting any job.
CSLB California Contractor License Requirements
According to the Contractors State License Board, applicants must meet the following minimum requirements to qualify for a California contractor license:
- At least 4 years of full-time experience in your specific trade within the last 10 years
- A valid Social Security Number or ITIN
- Must be 18 years of age or older
Meeting these requirements is the first step toward applying for a Class A, Class B, or C-classification contractor license in California.
List of California Contractor License Classifications
- C-4 – Boiler, Hot Water Heating and Steam Fitting Contractor
- C-5 – Framing and Rough Carpentry Contractor
- C-6 – Cabinet, Millwork and Finish Carpentry Contractor
- C-7 – Low Voltage Systems Contractor
- C-8 – Concrete Contractor
- C-9 – Drywall Contractor
- C-10 – Electrical Contractor
- C-11 – Elevator Contractor
- C-12 – Earthwork and Paving Contractors
- C-13 – Fencing Contractor
- C-15 – Flooring and Floor Covering Contractors
- C-16 – Fire Protection Contractor
- C-17 – Glazing Contractor
- C-20 – Warm-Air Heating, Ventilating and Air-Conditioning Contractor
- C-21 – Building Moving/Demolition Contractor
- C-22 – Asbestos Abatement Contractor
- C-23 – Ornamental Metal Contractor
- C-27 – Landscaping Contractor
- C-28 – Lock and Security Equipment Contractor
- C-29 – Masonry Contractor
- C-31 – Construction Zone Traffic Control Contractor
- C-32 – Parking and Highway Improvement Contractor
- C-33 – Painting and Decorating Contractor
- C-34 – Pipeline Contractor
- C-35 – Lathing and Plastering Contractor
- C-36 – Plumbing Contractor
- C-38 – Refrigeration Contractor
- C-39 – Roofing Contractor
- C-42 – Sanitation System Contractor
- C-43 – Sheet Metal Contractor
- C-45 – Sign Contractor
- C-46 – Solar Contractor
- C-47 – General Manufactured Housing Contractor
- C-50 – Reinforcing Steel Contractor
- C-51 – Structural Steel Contractor
- C-53 – Swimming Pool Contractor
- C-54 – Ceramic and Mosaic Tile Contractor
- C-55 – Water Conditioning Contractor
- C-57 – Well Drilling Contractor
- C-60 – Welding Contractor
- D03 – Awnings
- D04 – Central Vacuum Systems
- D06 – Concrete Related Services
- D09 – Drilling, Blasting and Oil Field Work
- D10 – Elevated Floors
- D12 – Synthetic Products
- D16 – Hardware, Locks and Safes
- D21 – Machinery and Pumps
- D24 – Metal Products
- D28 – Doors, Gates and Activating Devices
- D29 – Paperhanging
- D30 – Pile Driving and Pressure Foundation Jacking
- D31 – Pole Installation and Maintenance
- D34 – Prefabricated Equipment
- D35 – Pool and Spa Maintenance
- D38 – Sand and Water Blasting
- D39 – Scaffolding
- D40 – Service Station Equipment and Maintenance
- D41 – Siding and Decking
- D42 – Sign Installation
- D49 – Tree Service
- D50 – Suspended Ceilings
- D52 – Window Coverings
- D53 – Wood Tanks
- D56 – Trenching Only
- D59 – Hydroseed Spraying
- D62 – Air and Water Balancing
- D63 – Construction Clean-up
- D64 – Non-specialized
- D65 – Weatherization and Energy Conservation
List of California Contractor License Classifications
- C-4 – Boiler, Hot Water Heating and Steam Fitting Contractor
- C-5 – Framing and Rough Carpentry Contractor
- C-6 – Cabinet, Millwork and Finish Carpentry Contractor
- C-7 – Low Voltage Systems Contractor
- C-8 – Concrete Contractor
- C-9 – Drywall Contractor
- C-10 – Electrical Contractor
- C-11 – Elevator Contractor
- C-12 – Earthwork and Paving Contractors
- C-13 – Fencing Contractor
- C-15 – Flooring and Floor Covering Contractors
- C-16 – Fire Protection Contractor
- C-17 – Glazing Contractor
- C-20 – Warm-Air Heating, Ventilating and Air-Conditioning Contractor
- C-21 – Building Moving/Demolition Contractor
- C-22 – Asbestos Abatement Contractor
- C-23 – Ornamental Metal Contractor
- C-27 – Landscaping Contractor
- C-28 – Lock and Security Equipment Contractor
- C-29 – Masonry Contractor
- C-31 – Construction Zone Traffic Control Contractor
- C-32 – Parking and Highway Improvement Contractor
- C-33 – Painting and Decorating Contractor
- C-34 – Pipeline Contractor
- C-35 – Lathing and Plastering Contractor
- C-36 – Plumbing Contractor
- C-38 – Refrigeration Contractor
- C-39 – Roofing Contractor
- C-42 – Sanitation System Contractor
- C-43 – Sheet Metal Contractor
- C-45 – Sign Contractor
- C-46 – Solar Contractor
- C-47 – General Manufactured Housing Contractor
- C-50 – Reinforcing Steel Contractor
- C-51 – Structural Steel Contractor
- C-53 – Swimming Pool Contractor
- C-54 – Ceramic and Mosaic Tile Contractor
- C-55 – Water Conditioning Contractor
- C-57 – Well Drilling Contractor
- C-60 – Welding Contractor
- D03 – Awnings
- D04 – Central Vacuum Systems
- D06 – Concrete Related Services
- D09 – Drilling, Blasting and Oil Field Work
- D10 – Elevated Floors
- D12 – Synthetic Products
- D16 – Hardware, Locks and Safes
- D21 – Machinery and Pumps
- D24 – Metal Products
- D28 – Doors, Gates and Activating Devices
- D29 – Paperhanging
- D30 – Pile Driving and Pressure Foundation Jacking
- D31 – Pole Installation and Maintenance
- D34 – Prefabricated Equipment
- D35 – Pool and Spa Maintenance
- D38 – Sand and Water Blasting
- D39 – Scaffolding
- D40 – Service Station Equipment and Maintenance
- D41 – Siding and Decking
- D42 – Sign Installation
- D49 – Tree Service
- D50 – Suspended Ceilings
- D52 – Window Coverings
- D53 – Wood Tanks
- D56 – Trenching Only
- D59 – Hydroseed Spraying
- D62 – Air and Water Balancing
- D63 – Construction Clean-up
- D64 – Non-specialized
- D65 – Weatherization and Energy Conservation
Ready to Start Your Contractor License Preparation?
Not sure which license or course option is right for you? Choose one of our flexible preparation packages below to get started today, or contact our team for guidance. We’ll help you select the correct CSLB license classification and course package based on your experience, goals, and timeline.
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with Tools Designed for Real Results
Our programs prepare you for every major CSLB license classification. Each course includes comprehensive study materials, application assistance, and online access within minutes of purchase.
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Learn from anywhere, on any device. Your progress syncs automatically so you can switch between desktop, tablet, and phone without missing a step.
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Reinforce your knowledge with two chapter-specific quizzes that mirror real CSLB exam questions, helping you learn faster and retain more.
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Join our instructors every week for a live online class where we review a specific chapter, explain key concepts, and answer your questions in real time. It’s the perfect mix of personal support and group motivation to keep you moving toward your license.
The Only Contractor License Courses with Tools Designed for Real Results
At CSLP, we’re proud to offer the most complete contractor license preparation system in California. Our courses combine self-paced learning with live instructor interaction, giving you the flexibility and guidance you need to pass your CSLB exam confidently — on your first try.
Online & Downloadable Note Cards
Study smarter with ready-to-use digital note cards you can access or download anytime ... perfect for quick reviews and memorization on the go.
Easy Online & Mobile App Access
Learn from anywhere, on any device. Your progress syncs automatically so you can switch between desktop, tablet, and phone without missing a step.
Multiple Practice Quizzes per Chapter
Reinforce your knowledge with two chapter-specific quizzes that mirror real CSLB exam questions, helping you learn faster and retain more.
Weekly Live Classes & Q&A Sessions
Join our instructors every week for a live online class where we review a specific chapter, explain key concepts, and answer your questions in real time. It’s the perfect mix of personal support and group motivation to keep you moving toward your license.
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Frequently Asked Questions About California Contractor License Types
Contractor license classifications define the type of construction work a contractor is legally allowed to perform in California. The CSLB issues licenses under Class A (General Engineering), Class B (General Building), and C-classification specialty licenses, each with specific scopes of work.
The license you need depends on the type of work you perform most often. If you manage multiple trades on a project, you may need a Class B license. If you perform a single specialty trade, such as electrical or plumbing, a C-classification license may be required.
Yes. Contractors can hold multiple classifications if they meet the experience requirements and pass the required exams for each license type.
- Class A licenses are for large engineering projects like highways and infrastructure
- Class B licenses are for general building work involving multiple trades
- C licenses are specialty licenses focused on a single trade, such as electrical, plumbing, HVAC, or roofing
If the total cost of the job is $500 or more, including labor and materials, a valid contractor license is required. Working without a license on jobs above this limit can result in fines and penalties.
No. The CSLB does not approve or endorse prep schools. However, reputable schools design their courses specifically around the CSLB exam structure and requirements to help applicants prepare effectively.
Yes. Contractors can add or change classifications by submitting an application and meeting the experience and testing requirements for the new license type.
Yes. Your license classification determines which projects you can legally bid on, advertise for, and perform. Working outside your classification can lead to disciplinary action from the CSLB.
Yes. Most classifications require at least four years of journey-level experience in the specific trade within the last ten years.
If you’re unsure which license applies to your work, a contractor license preparation school can help explain the classifications and guide you toward the correct license path before applying. Contact Us Today!
Yes — you’ll get instant access to your course and study materials within minutes of enrolling.
Frequently Asked Questions About California Contractor License Types
Contractor license classifications define the type of construction work a contractor is legally allowed to perform in California. The CSLB issues licenses under Class A (General Engineering), Class B (General Building), and C-classification specialty licenses, each with specific scopes of work.
The license you need depends on the type of work you perform most often. If you manage multiple trades on a project, you may need a Class B license. If you perform a single specialty trade, such as electrical or plumbing, a C-classification license may be required.
Yes. Contractors can hold multiple classifications if they meet the experience requirements and pass the required exams for each license type.
- Class A licenses are for large engineering projects like highways and infrastructure
- Class B licenses are for general building work involving multiple trades
- C licenses are specialty licenses focused on a single trade, such as electrical, plumbing, HVAC, or roofing
If the total cost of the job is $500 or more, including labor and materials, a valid contractor license is required. Working without a license on jobs above this limit can result in fines and penalties.
No. The CSLB does not approve or endorse prep schools. However, reputable schools design their courses specifically around the CSLB exam structure and requirements to help applicants prepare effectively.
Yes. Contractors can add or change classifications by submitting an application and meeting the experience and testing requirements for the new license type.
Yes. Your license classification determines which projects you can legally bid on, advertise for, and perform. Working outside your classification can lead to disciplinary action from the CSLB.
Yes. Most classifications require at least four years of journey-level experience in the specific trade within the last ten years.
If you’re unsure which license applies to your work, a contractor license preparation school can help explain the classifications and guide you toward the correct license path before applying. Contact Us Today!
Yes — you’ll get instant access to your course and study materials within minutes of enrolling.