How many insulation & acoustical contractors are licensed in California?

California has 1,216 contractors with a C-2 (Insulation & Acoustical) license from the Contractors State License Board. 1,180 (97%) hold active licenses. SiteVetter checks each against SAM.gov, OSHA, DOL, and EPA databases.

What does a C-2 license cover in California?

A California C-2 license covers insulation and acoustical contractors for thermal and sound insulation. Any contractor performing insulation & acoustical work valued at $500 or more must hold this license. The CSLB issues and regulates all contractor licenses in the state.

What percentage of insulation & acoustical contractors have federal violations?

12.6% of California insulation & acoustical contractors (153 out of 1,216) have at least one record in federal databases. These include SAM.gov debarments, DOL wage violations, OSHA safety citations, and EPA environmental violations.

Verify Insulation & Acoustical Contractors (C-2) - Page 21 | CSLB + Federal Check

How to Verify a Insulation & Acoustical Contractor (C-2) in California

California requires all contractors performing insulation & acoustical work valued at $500+ to hold a valid CSLB C-2 license. Of the 1,216 licensed insulation & acoustical contractors in the state, 97% currently hold active licenses and 12.6% have at least one federal compliance record.

Manual vetting takes 45+ minutes per contractor and routinely misses violations in databases most people don't know to check. SiteVetter runs CSLB status, SAM.gov debarment, DOL wage violations, OSHA safety citations, and EPA environmental records in seconds—creating a timestamped compliance artifact.

Verification Checklist for Insulation & Acoustical 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 Verification Matters for Insulation & Acoustical Work

Under California's "Controlling Employer" doctrine, general contractors face liability for subcontractor safety violations. For insulation & acoustical work specifically, 12.6% of licensed contractors have federal records that a standard CSLB license check wouldn't reveal. SiteVetter's 5-database check catches what a single-source verification misses.

Insulation & Acoustical Contractor Verification - Page 21

About C-2 License

Insulation & Acoustical Contractors

How to Verify a Insulation & Acoustical Contractor (C-2) in California

Verification Checklist for Insulation & Acoustical Contractors

Why Verification Matters for Insulation & Acoustical Work