The city's Builder's Department often requires signatures from professional contractors holding C-class licenses before issuing construction permits because C-class license contractors possess specialized technical expertise and certification in specific fields, ensuring that projects comply with strict industry standards and safety regulations during design and construction. Especially in technically demanding projects involving electrical, plumbing, HVAC, etc., C-class contractors have the necessary qualifications to perform technical calculations, design, and assessments, ensuring project safety and compliance.

The city government requires C-class license contractor signatures mainly to ensure that technical details during construction comply with regulations, avoiding safety hazards or compliance issues caused by improper design or construction. For example, in electrical system design and construction, only electricians holding a C-10 license can ensure that electrical load calculations, circuit layouts, etc., meet standards, avoiding potential electrical failures or fire risks. Therefore, the city government needs these professional contractors' signatures to verify the project's technical compliance, ensuring safe and smooth project execution.

Even if you just arrived in the United States, you can apply for a contractor license. The US government encourages foreigners to legally establish companies. You can register and operate a company in the US and apply for a contractor license through the company. Especially in California, the Contractors State License Board (CSLB) accepts relevant work experience from other states and abroad, meaning that even if you don't have work experience in the US, as long as your work history meets California's requirements, you can use experience from elsewhere to apply for a license. Additionally, you can legally register a company, meet relevant conditions, pass necessary exams, and apply for the contractor license you need. Therefore, although you cannot directly employ yourself without work authorization, through legal company registration, you can still apply for and obtain a contractor license in the company's name.

You don't necessarily need to register a company first; individuals can also apply directly. The California Contractors State License Board (CSLB) allows individuals to operate as contractors under their own name, as long as they meet the corresponding conditions. You need to have certain work experience (typically 4 to 5 years) and pass relevant exams, proving you have sufficient professional knowledge and skills to undertake construction projects. Additionally, you need to provide legal identification and a tax number (such as SSN or ITIN). If you don't have legal work authorization, you can still apply for a contractor license by establishing a company. In this case, your company will assume the license responsibility, and you can apply for and obtain the license as a company representative. Whether in your personal name or through a company, you can legally apply for a contractor license in the US, as long as you meet California's relevant requirements.

The California contractor license exam consists of two parts: the Law and Business exam and the Trade-Specific Knowledge exam. Each part lasts 210 minutes (3 hours and 30 minutes), and the exam is computer-based. The exam location is at PSI, a third-party testing center authorized by the California Contractors State License Board (CSLB). The Law and Business exam mainly tests legal and business knowledge related to construction business, such as company management, contracts, insurance, taxes, and labor law, with approximately 115 to 120 questions. The Trade-Specific Knowledge exam focuses on your technical abilities in a specific construction field, also with 115 to 120 questions, covering construction techniques, building codes, and material usage. Candidates can review using reference materials provided by the CSLB and exam preparation courses available on the market. After successfully passing both parts of the exam, you will obtain a California contractor license and can legally undertake construction projects.

Currently, the California contractor license exam testing center (PSI) offers exam options in multiple languages, including Spanish, Vietnamese, etc., but there is currently no Chinese exam. If your English proficiency is limited, you can bring a translator to assist you during the exam. According to California Contractors State License Board (CSLB) regulations, the translator must be a non-relative, non-company employee, and can only provide language translation services, not assist in answering exam content. When registering, it's recommended that you confirm in advance the specific language options PSI provides and ensure your translator meets the relevant requirements.

The registration process for FLYBULL contractor license training is very simple and efficient. First, students need to download the FLYBULL contractor license training app and register an account, creating a personal learning profile. Students choose appropriate courses based on their needs; FLYBULL offers various training courses including A, B, and C-class licenses, covering comprehensive construction knowledge. After selecting a course, students sign a service contract and complete payment, with flexible and convenient payment methods. Once payment is completed, students can begin learning. FLYBULL provides textbooks, online courses, online practice questions, and mock exams (optional), helping students fully prepare and familiarize themselves with exam content and format.

During the learning process, FLYBULL will provide exam application and exam scheduling services, ensuring students successfully register and arrange exam times. Through FLYBULL's mock exams, students can become more familiar with CSLB exam question types and difficulty, thereby improving exam pass rates. After passing the exam, students will obtain a California contractor license and officially become qualified construction contractors. The entire process is fully supported by FLYBULL, ensuring students smoothly complete learning, exams, and successfully obtain their contractor license.

• C-2 - 隔墙与天花板（Insulation and Acoustical Contractor）
• C-5 - 木工与粗加工（Framing and Rough Carpentry Contractor）
• C-6 - 瓷砖和马赛克（Cabinet, Millwork and Finish Carpentry Contractor）
• C-7 - 低电压系统（Low Voltage Systems Contractor）
• C-8 - 混凝土工程（Concrete Contractor）
• C-9 - 干墙安装（Drywall Contractor）
• C-10 - 电工（Electrical Contractor）
• C-11 - 电梯安装（Elevator Contractor）
• C-12 - 土地平整和排水（Earthwork and Paving Contractor）
• C-13 - 篱笆安装（Fencing Contractor）
• C-15 - 地板与地毯（Flooring and Floor Covering Contractor）
• C-16 - 消防系统（Fire Protection Contractor）
• C-17 - 玻璃和镜子（Glazing Contractor）
• C-20 - 暖通空调（Warm-Air Heating, Ventilating and Air-Conditioning Contractor）
• C-21 - 建筑搬迁/拆除（Building Moving/Demolition Contractor）

• C-23 - 装饰品和装饰（Ornamental Metal Contractor）
• C-27 - 景观（Landscaping Contractor）
• C-28 - 冷藏库（Lock and Security Equipment Contractor）
• C-29 - 钣金工程（Masonry Contractor）
• C-31 - 水管铺设（Construction Zone Traffic Control Contractor）
• C-32 - 地毯安装（Parking and Highway Improvement Contractor）
• C-33 - 油漆和装饰（Painting and Decorating Contractor）
• C-34 - 管道安装（Pipeline Contractor）
• C-35 - 石膏（Plastering Contractor）
• C-36 - 管道工程（Plumbing Contractor）
• C-37 - 游泳池（Swimming Pool Contractor）
• C-38 - 制冷（Refrigeration Contractor）
• C-39 - 屋顶（Roofing Contractor）

• C-42 - 排水与卫生设备（Sanitation Systems Contractor）
• C-43 - 钣金（Sheet Metal Contractor）
• C-45 - 标牌工程（Sign Contractor）
• C-46 - 太阳能（Solar Contractor）
• C-50 - 钢筋工程（Steel, Reinforcing Contractor）
• C-51 - 结构钢材（Structural Steel Contractor）
• C-53 - 泳池工程（Swimming Pool Contractor）
• C-54 - 瓷砖（Tile Contractor）
• C-55 - 水井钻探（Water Well Drilling Contractor）
• C-57 - 供水（Well Drilling Contractor）
• C-60 - 焊接工程（Welding Contractor）
• C-61 - 附加许可（Limited Specialty Contractor，细分为多种小类）