San Diego HVAC License Requirements (2026)

📋 Your checklist

State

1. CSLB C-20 HVAC contractor license
   Heating, ventilating and air-conditioning contracting needs a CSLB C-20 license (C-38 for refrigeration).
   ⏰ Active licenses expire every two years (verify your date on CSLB)
   Source: California CSLB: License classifications · California CSLB: Who needs a contractor license · California CSLB: General renewal information
2. Secretary of State and Franchise Tax Board filings
   LLCs and corporations file a Statement of Information ($20 or $25) and most businesses pay at least $800 a year in Franchise Tax. A business name other than your own is filed with your county.
   ⏰ Statement of Information: frequency depends on entity type (verify). Franchise tax: yearly
   Source: California Secretary of State: Business entities FAQs

Local (San Diego / San Diego County)

1. City of San Diego Business Tax Certificate
   Required for all businesses, including home-based, self-employed and independent contractors; some also need a Police Permit. By mail: $38 ($34 tax + $4 state fee) plus $1.47 per employee Minimum Wage Enforcement Fee. Late fees if you apply more than 15 days after starting.
   ⏰ Annual; verify your renewal date on your certificate
   Source: City of San Diego Treasurer: Business Tax · City of San Diego Treasurer: How to apply for a Business Tax Certificate