Standard coverage · Baltimore
Baltimore, MD permit history & home risk data
Baltimore 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 Baltimore addresses.
What Tarn covers in Baltimore
Source: City of Baltimore DHCD Open Baltimore Datasets (ArcGIS FeatureServer), queried live
| System | Records since |
|---|---|
| Building and construction-related permits | confirmed live with current-year data |
- Pulled live from the city's ArcGIS open data service on every search, not a static extract — coverage reflects whatever the city has published as of your search.
- Fields are auto-detected from the live schema rather than hardcoded, so this stays working if the city renames or reorders columns.
- Matched by house number plus the first word of the street name; results may occasionally include unrelated records that happen to share both.
Baltimore frequently asked questions
How deep is Baltimore, MD permit data on Tarn?
Baltimore is covered by a live query against the city's public building permits dataset, matched by address as you search.
Where does Tarn's Baltimore permit data come from?
Tarn's Baltimore permit data comes from City of Baltimore DHCD Open Baltimore Datasets (ArcGIS FeatureServer), queried live.
How far back does Tarn's Baltimore coverage go?
Coverage varies by system in Baltimore: Building and construction-related permits (confirmed live with current-year data).
Does Tarn check code-era risks like lead paint or old wiring in Baltimore?
Yes. When you search a Baltimore 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 Baltimore?
Yes — Tarn is free while we're building it. In exchange, we ask what wasn't useful.
Look up a specific Baltimore address
Free while we're building. Tell us what's missing and you keep full access.