Washington building permits, one API call away.

Amalgament indexes 1,385,673 building permits for Washington from 18 public sources, normalized into one schema and joined to the businesses and parcels behind them. Query them through one REST API and one MCP server, or scope any call to Washington with a single parameter.

Coverage in Washington

1,385,673 building permits from 18 public sources.

Most recent record dated 2026-08-11. The /freshness endpoint reports every source's last pull.

Sources

• Seattle, Washington
• Seattle, WA
• Washington (state)
• Washington

One call, scoped to WA

curl -H "X-API-Key: $OPENFOLIO_KEY" \
  "https://api.amalgament.com/search?q=roofing&dataset_type=building_permit&jurisdiction=WA"

Common questions

How many building permits does Amalgament have for Washington?

1,385,673 building permits from 18 public sources in Washington, normalized into one schema and queryable in a single API call or MCP tool call.

Can I filter Amalgament to just Washington?

Yes. Pass jurisdiction=WA to the /search endpoint, or ask your MCP-connected agent for Washington, and results are scoped to Washington building permits.

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