Los Angeles Plumber License Requirements (2026)

📋 Your checklist

State

1. CSLB C-36 Plumbing contractor license
   Plumbing contracting needs a CSLB license in the C-36 class.
   ⏰ 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 (Los Angeles / Los Angeles County)

1. City of Los Angeles Business Tax Registration Certificate (BTRC)
   Every person engaged in business in the city needs one, including anyone physically working in the city 7 or more days a year. Businesses in unincorporated LA County may need a county license instead.
   ⏰ Renew by the last day of February each year
   Source: City of Los Angeles Finance: Business tax FAQ · City of Los Angeles Finance: Business tax renewal deadlines