California CSLB data

California Contractor License API

Name: California Contractor Credential Data
Creator: StateLicense

Add California CSLB license checks to contractor onboarding and compliance workflows without building and maintaining your own source-data pipeline.

Production APILive

curl --request POST "https://api.statelicense.io/v1/search" \
  --header "Authorization: Bearer YOUR_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "state": "CA",
  "business_name": "ACME",
  "page_size": 5
}'

Representative response

{
  "results": [
    {
      "state": "CA",
      "license_number": "LICENSE_NUMBER",
      "business_name": "Example Contractor",
      "status": "active",
      "authority": "California Contractors State License Board",
      "license_type": "Source-specific type",
      "source_updated_at": "2026-09-03T00:00:00Z"
    }
  ],
  "total": 1,
  "page": 1
}

Authority

California Contractors State License Board

Live coverage

Statewide CSLB contractor classifications

Refresh cadence

Daily

Using CSLB data programmatically

CSLB maintains the official California contractor records. StateLicense maps supported CSLB identity, status, classification, date, bond, workers’ compensation, and freshness data into the same normalized response contract used for other authorities.

Businesses use the API to search by business name when a contractor has not supplied a license number or verify a known number during onboarding without turning each check into a manual website search.

Treat a license match as one input to review. Confirm identity, current status, the classification required for the proposed work, and any relevant bond or workers’ compensation details.

Common California verification use cases

California license checks can be added to marketplace enrollment, vendor qualification, pre-hire review, renewal monitoring, and exception queues.

Validate a contractor-provided CSLB number.
Find possible records from a business name.
Route inactive, mismatched, or incomplete records for review.

API fields returned

Information	Availability
License status and expiration	When supplied by the authority
Business and licensee identity	When supplied by the authority
CSLB classifications	When supplied by the authority
Bond information	When supplied by the authority
Workers’ compensation information	When supplied by the authority
Source and record timestamps	When supplied by the authority

Freshness: Daily. Field availability depends on the source record; unavailable values are not inferred.

Coverage limitations

• Field availability depends on the CSLB source record.
• A matching license does not establish identity, insurance sufficiency, or suitability for a project.