What This API Does

🔧

California Plumber License Verification

Verify master plumber, journeyman, and plumbing contractor licenses regulated by the Contractors State License Board (CSLB) — C-36 Plumbing. Returns license classification, active status, bond and insurance details, and any violations.

Who Uses This API in California

🏗️

General Contractors

Verify plumbing sub-contractor licenses for California projects. Ensure proper credentials before assigning plumbing work.

🏠

Home Service Platforms

Validate plumber credentials in real-time for California service bookings. Build trust by showing verified license status to homeowners.

📊

Insurance Underwriters

Confirm plumbing contractor licensure in California before issuing liability policies. Monitor license expirations across your portfolio.

California Plumber Licensing Authority

Plumber Licenses

Contractors State License Board (CSLB) — C-36 Plumbing

Governs Master Plumber, Journeyman Plumber, Plumbing Contractor licensure in California. Handles initial licensing, renewals, and disciplinary proceedings.

More California License Types

🏥 Nurse & Contractor → 🏠 Real Estate Agent → 🛡️ Insurance Agent → 🔨 General Contractor → ⚡ Electrician → ❄️ HVAC Technician →

API Endpoints

POST /plumber/verify

Verify a plumber license in California

curl -X POST https://license-verify-api-production.up.railway.app/plumber/verify \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: YOUR_API_KEY" \
  -d '{
    "name": "Robert Wilson",
    "state": "CA",
    "license_type": "Master Plumber"
  }'

POST /batch

Verify multiple plumber licenses at once

curl -X POST https://license-verify-api-production.up.railway.app/batch \
  -H "Content-Type: application/json" \
  -H "X-RapidAPI-Key: YOUR_API_KEY" \
  -d '{
    "requests": [
      { "type": "plumber", "name": "Robert Wilson", "state": "CA", "license_type": "Master Plumber" },
      { "type": "plumber", "name": "Alice Brown", "state": "CA", "license_type": "Journeyman Plumber" }
    ]
  }'

Example Response

{
  "status": "found",
  "state": "CA",
  "license": {
    "name": "Robert Wilson",
    "license_number": "CA-PLMB-2024-XXXXX",
    "license_type": "Master Plumber",
    "status": "Active",
    "issue_date": "2020-06-15",
    "expiration_date": "2026-12-31",
    "board": "Contractors State License Board (CSLB) — C-36 Plumbing",
    "disciplinary_actions": []
  }
}

Pricing

Free

$0

50 requests/day

Pro

$9.99

1,000 requests/mo

Ultra

$29.99

5,000 requests/mo

Mega

$99.99

25,000 requests/mo

Subscribe on RapidAPI →

FAQ — California Plumber License Verification

Which California plumber license types can I verify?

Master Plumber, Journeyman Plumber, Apprentice, and Plumbing Contractor licenses regulated by the Contractors State License Board (CSLB) — C-36 Plumbing.

Can I verify plumbing contractor bonds?

Yes — the API returns bond amount and surety details for California plumbing contractors where the state requires bonding.

Can I verify licenses across multiple states?

Yes. The same API works for all 50 states. Use the batch endpoint to verify California plumber licenses alongside any other state in a single request.

Is there a free tier?

Yes — 50 free requests per day. No credit card required. Sign up on RapidAPI to get your key instantly.

Plumber License Verification API
California