A Complete Guide to the C20 License for HVAC Contractors in California

The C20 License is a critical credential for HVAC contractors in California, allowing professionals to legally install, repair, and maintain heating, ventilation, and air conditioning systems. Whether you’re an aspiring HVAC contractor or looking to expand your contracting business, understanding the ins and outs of this license is essential for success. In this guide, we’ll […]
Contractors Board Enforcement Essential
What You Need to Know About Enforcement Actions by the Contractors State License Board By Garret Murai, April 13, 2015 I questioned whether to even write this post. Because, of course, YOU would never find yourself hightailing it out of town with the California Contractor’s State License Board (“CSLB”) sniffing down your tail pipes. Then again, mistaken identities […]
Contractors State License Board Profiling
Is the Contractors State License Board profiling out of State applicants? UPDATE: Turns out the application was for a “critical classification” so the CSLB was true to form in asking for additional documentation. The applicant was able to prove his experience and his exam date has been scheduled! It seems they are. Case in point: […]
CSLB Application Processing in Action
CSLB Application Processing Action: What It Means & What to Do Next If your California contractor license application shows a status of “Application Processing Action”, it can feel confusing or even concerning. This status does not automatically mean there is a problem, but it does indicate that the California Contractors State License Board (CSLB) requires […]
Email from a License Guru Blog Reader
Below is an email from a License Guru Blog reader describing her CSLB experience review nightmare. “I have been following the license guru blog for about 7 months now which is just 3 months short of the full year my husband has been getting the run around from the investigator assigned to his file. On […]
CSLB Application Denials and the Appeals Process

Let’s take a minute to discuss CSLB Application Denials and the Appeals Process. It’s a boring subject I know, but it’s good information to have if you find yourself stuck in the AIU vortex. If your application is denied by the Application Investigation Unit, Section 485 kicks in. § 485. Procedure upon denial Upon denial […]
How to get a California Contractors License Part 3
In this series of posts, I’ll tell you how to get a California Contractors License. On to part 3. 12) What happens if I fail the exams? The Law and Trade exams are scored separately, and you can take either exam as many times as necessary for 18 months (at $50 per retake). If you don’t pass within […]
Start a Construction Business
Below are some tips on how you can Start a Construction Business from the Governor’s Office of Business and Economic Development. It’s a beginning point to get you started with some basic information. In bullet point number 8 is a link to CalGOLD. Enter your type of business (construction) into the database and it will provide you […]