Townline
Data licensing

The tri-state permit data API

The deepest building-permit coverage in New York, New Jersey, Connecticut, and Philadelphia — collected from town systems directly, daily to same-day, exactly where national providers are thinnest.

1,093,041
permits on file
46
counties
162,014
licensed contractors
Same-day
freshest sources

What a record looks like

{
  "id": "p_…",
  "muni": "Town of Greenwich",
  "regionId": "fairfield-ct",
  "permitType": "Building",
  "description": "Remodel kitchen.",
  "status": "Issued",
  "issuedDate": "2026-07-24",
  "valuation": 75000,
  "contractor": "…",
  "address": "…",
  "latitude": 41.02, "longitude": -73.62,
  "trades": [{ "id": "general-contractor", "name": "General contractor" }],
  "changedAt": "…",
  "statusEvents": [
    { "oldStatus": "Applied", "newStatus": "Issued", "observedAt": "…" }
  ]
}

Each record carries the permit facts and, when we have them, the contractor, valuation, map coordinates and status history.

What you get

Search API
Permits by county, town, trade, status, date, and valuation — the same endpoints that power the Townline app.
Permit feed
A cursor feed of new permits in the order we find them, so each pull returns only what's new since the last.
Change feed
Each later change to a permit, field by field with before and after: a status moving to issued, a new valuation or contractor. Each permit also says when it last changed.
Licence roster
180,000+ active NY/NJ/CT contractor licences, matched to permit activity.
Cost aggregates
Median project costs by county, town, and work type, from real valuations.

Who licenses this

Solar and generator dealers prospecting installs, building-product teams tracking where their category gets installed, home-services groups doing territory diligence, insurers and proptech products that need permit history by address. If your problem is “national data is thin exactly where we operate,” this is the regional fix.