Washington L&I contractor data

Washington Contractor License API

Use the Washington L&I contractor API coverage in StateLicense to search or verify statewide construction, electrical, plumbing, and elevator records.

Get Free API Key View API Docs

Production APILive

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

Representative response

{
  "results": [
    {
      "state": "WA",
      "license_number": "LICENSE_NUMBER",
      "business_name": "Example Contractor",
      "status": "active",
      "authority": "Washington Department of Labor & Industries",
      "license_type": "Source-specific type",
      "source_updated_at": "2026-09-03T00:00:00Z"
    }
  ],
  "total": 1,
  "page": 1
}

Authority

Washington State Department of Labor & Industries (L&I)

Live coverage

Statewide construction, electrical, plumbing, and elevator contractor records

Refresh cadence

Daily

Washington L&I datasets in one response model

Search statewide records across four L&I contractor datasets while keeping source-specific license types and specialties available for review.

Construction contractor registrations and specialties.
Electrical and plumbing contractor licenses.
Elevator contractor records.

Designed for repeatable verification

Add Washington checks to onboarding, monitoring, internal operations, and exception-review workflows while retaining source and freshness context.

API fields returned

Information	Availability
License number and status	When supplied by the authority
Business and principal identity	When supplied by the authority
License type and specialty	When supplied by the authority
Issue, expiration, and suspension dates	When supplied by the authority
Phone and mailing location	When supplied by the authority
Authority and freshness timestamps	When supplied by the authority

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

Coverage limitations

• Field availability differs across construction, electrical, plumbing, and elevator sources.
• A matching record does not establish identity, insurance sufficiency, or suitability for a project.