Standard coverage · Chicago
Chicago, IL permit history & home risk data
Chicago is covered by a live query against the city's public Building Permits dataset, matched by address as you search.
Year built is optional, but it's what unlocks the code-era risk exam for Chicago addresses.
What Tarn covers in Chicago
Source: City of Chicago Building Permits (Socrata dataset ydr8-5enu), queried live
| System | Records since |
|---|---|
| Building permits | 2006 |
- Pulled live from the City of Chicago's public permit system on every search, not a static extract — coverage reflects whatever the city has published as of your search.
- Matched by house number and street name, with the leading direction (N/S/E/W) parsed out of the searched street separately, since Chicago stores it as its own field rather than part of the street name.
Chicago frequently asked questions
How deep is Chicago, IL permit data on Tarn?
Chicago is covered by a live query against the city's public Building Permits dataset, matched by address as you search.
Where does Tarn's Chicago permit data come from?
Tarn's Chicago permit data comes from City of Chicago Building Permits (Socrata dataset ydr8-5enu), queried live.
How far back does Tarn's Chicago coverage go?
Coverage varies by system in Chicago: Building permits (since 2006).
Does Tarn check code-era risks like lead paint or old wiring in Chicago?
Yes. When you search a Chicago address and enter the year it was built, Tarn checks it against national code-era risk factors — lead paint, electrical panel age and wiring type, plumbing material, and more.
Is Tarn free to use in Chicago?
Yes — Tarn is free while we're building it. In exchange, we ask what wasn't useful.
Look up a specific Chicago address
Free while we're building. Tell us what's missing and you keep full access.