How many C-4 boiler, hot water & steam contractors are licensed in California?

California has 721 contractors with a C-4 (Boiler, Hot Water & Steam) license from the Contractors State License Board. 698 (97%) hold active licenses. SiteVetter's C-4 license lookup checks each against SAM.gov, OSHA, DOL, and EPA databases.

What does a C-4 license cover in California?

A California C-4 license covers boiler, hot water heating, and steam fitting contractors. Any contractor performing boiler, hot water & steam work valued at $500 or more must hold this license. The CSLB issues and regulates all contractor licenses in the state.

What percentage of boiler, hot water & steam contractors have federal violations?

13.6% of California boiler, hot water & steam contractors (98 out of 721) have at least one record in federal databases. These include SAM.gov debarments, DOL wage violations, OSHA safety citations, and EPA environmental violations.

C-4 Boiler, Hot Water & Steam Contractors in California - Page 2 | CSLB License Lookup

C-4 Boiler, Hot Water & Steam Contractor License Lookup

Use this page when you need a California C-4 license lookup, a list of licensed boiler, hot water & steam contractors, or a quick screen before assigning boiler, hot water & steam work to a sub. Each row links to a contractor profile with CSLB status, workers' comp, bond, federal records, and permit checks.

California has 721 CSLB C-4 license records for boiler, hot water & steam contractors. 97% currently hold active licenses and 13.6% have at least one federal compliance record. SiteVetter checks CSLB status, SAM.gov debarment, DOL wage violations, OSHA safety citations, EPA environmental records, and building permits in seconds.

What to Check for C-4 Boiler, Hot Water & Steam Contractors

Verify the contractor license is active and in good standing
Request proof of insurance and bonding
Get at least 3 written quotes before selecting a contractor
Check federal databases: SAM.gov, OSHA, DOL, and EPA records
Confirm bond: California requires $25,000+ contractor bond (SB 607)

Why Federal Records Matter for Boiler, Hot Water & Steam Work

For boiler, hot water & steam work, 13.6% of licensed contractors have federal records that a standard CSLB license check would not reveal. SiteVetter's 6-source lookup gives GCs a faster way to compare subs before bid award, onboarding, or renewal review.

C-4 Boiler, Hot Water & Steam Contractors in California - Page 2

CSLB C-4 License Scope

C-4 Boiler, Hot Water & Steam Contractor License Records

C-4 Boiler, Hot Water & Steam Contractor License Lookup

What to Check for C-4 Boiler, Hot Water & Steam Contractors

Why Federal Records Matter for Boiler, Hot Water & Steam Work