How do I verify a General Contractor license in Washington?

Call TradesAPI's GET /verify with state=WA, the license number, and trade=general to get a normalized result — valid/invalid, status, expiration, and any disciplinary actions — in one request. You can also search the official Washington board portal by hand.

What comes back for a Washington general contractor license?

The normalized /verify result: whether the license is valid, its current status and expiration date, and any disciplinary actions the Washington board publishes — the same schema as every other state and trade.

Is Washington general contractor license data free to check?

The Washington board's public portal is free to search manually. TradesAPI adds a single normalized API across all 50 states plus DC — every new API key includes 50 free verifications.

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Washington · General Contractor license lookup

How to verify general contractor licenses in Washington

Check any Washington general contractor license — status, expiration, and disciplinary history — through one normalized API, or look it up by hand on the state board portal.

Washington coverage: Operational · live status

What you can verify

Trade: General Contractor

Data source: Washington open data portal (daily)

Coverage: General Contractor, Electrical, Plumbing — bond + insurance + principal

Looking for a different Washington trade, or the same trade in another state? See the full Washington license guide or the national General Contractor lookup by state.

One call. The whole picture.

The /verify response is identical in shape across every state and trade, so your integration code never changes per jurisdiction:

GET /verify?state=WA&license=SAMPLE-12345&trade=general

{
  "valid": true,
  "name": "SAMPLE CONTRACTING LLC",
  "license_number": "SAMPLE-12345",
  "trade": "general",
  "expiration": "05/12/2027",
  "status": "Active",
  "state": "WA",
  "disciplinary_actions": [],
  "source_url": "https://secure.lni.wa.gov/verify/",
  "cached": false,
  "checked_at": "2026-07-06T16:00:00Z"
}

Example response showing the normalized schema. Wire it up against deterministic fixtures in the sandbox — no credit cost.

Verify Washington general contractor licenses programmatically

# Verify a Washington general contractor license with one API call
curl -H "X-API-Key: YOUR_KEY" \
  "https://www.tradesapi.com/verify?state=WA&license=SAMPLE-12345&trade=general"

The official Washington board portal is at https://secure.lni.wa.gov/verify/ — free to search general contractor licenses by hand. TradesAPI wraps it (and every other state) in one API so you don't maintain 51 different scrapers.

Start verifying in minutes

Every new API key includes 50 free verifications across all 50 states + DC, plus hosted MCP access for Claude, Cursor, and any MCP-speaking agent. No credit card to start.

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Frequently asked questions

How do I verify a General Contractor license in Washington?: Call TradesAPI's GET /verify with state=WA, the license number, and trade=general to get a normalized result — valid/invalid, status, expiration, and any disciplinary actions — in one request. You can also search the official Washington board portal by hand.
What comes back for a Washington general contractor license?: The normalized /verify result: whether the license is valid, its current status and expiration date, and any disciplinary actions the Washington board publishes — the same schema as every other state and trade.
Is Washington general contractor license data free to check?: The Washington board's public portal is free to search manually. TradesAPI adds a single normalized API across all 50 states plus DC — every new API key includes 50 free verifications.