Baltimore building & ADU permits
Recent permit activity, updated continuously.
Baltimore is Maryland's largest city, regulating ADUs locally in a state with no statewide mandate. Igni reads Baltimore permits from the Open Baltimore portal under a license that explicitly permits commercial use; the feed carries no ZIP, so each record is reverse-geocoded from its location.
Igni is tracking 8,595 residential and building permits in Baltimore, MD — including 2 classified accessory-dwelling-unit (ADU) filings. The most active ZIP is 21230. The most recent filing Igni tracked was Sep 30, 2026. All records come from Open Baltimore — DHCD (ArcGIS), an official government open-data feed, and are refreshed continuously.
8595
Permits tracked
2
ADU permits
24
Distinct ZIP codes
Sep 30, 2026
Newest permit
Recent permits
A sample of the freshest permits in this jurisdiction — ZIP and city only (no street addresses).
| ZIP | Permit type | ADU type | Valuation | Applied |
|---|---|---|---|---|
| 21214 | Residential | — | — | Sep 29, 2026 |
| 21217 | Residential | — | $4,000 | Sep 29, 2026 |
| 21217 | Residential | — | $15,000 | Sep 29, 2026 |
| 21224 | Residential | — | $140 | Sep 29, 2026 |
| 21230 | Residential | — | $8,000 | Sep 29, 2026 |
| 21226 | Residential | — | $14,300 | Sep 29, 2026 |
| 21211 | Other | — | $160,000 | Sep 29, 2026 |
| 21216 | Residential | — | $140 | Sep 29, 2026 |
| 21223 | Residential | — | $140 | Sep 29, 2026 |
| 21231 | Residential | — | $20,000 | Sep 29, 2026 |
| 21223 | Residential | — | $15,000 | Sep 29, 2026 |
| 21224 | Residential | — | $140 | Sep 29, 2026 |
| 21230 | Residential | — | $75,000 | Sep 29, 2026 |
| 21231 | Residential | — | $140 | Sep 29, 2026 |
| 21218 | Residential | — | $140 | Sep 29, 2026 |
| 21214 | Residential | — | $140 | Sep 29, 2026 |
| 21230 | Residential | — | $140 | Sep 29, 2026 |
| 21218 | Residential | — | $0 | Sep 29, 2026 |
| 21201 | Residential | — | $136,137 | Sep 29, 2026 |
| 21201 | Residential | — | $136,137 | Sep 29, 2026 |
Top ZIP codes by recent activity
Housing law — Maryland
Accessory dwelling units in Maryland are regulated locally; there is no statewide ADU mandate, so rules vary by city and county.
Maryland has no statewide upzoning law; residential density is set by local zoning, with several counties pursuing their own reforms.
Data source
Sourced from Open Baltimore — DHCD (ArcGIS). Open Baltimore license (commercial use permitted).
Nearby cities — Maryland
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Baltimore permit records into leads.
Baltimore permit data — FAQ
Where does Igni get Baltimore permit data?
How fresh is Baltimore permit data?
Does Baltimore allow accessory dwelling units (ADUs)?
Get permit leads — Baltimore
Fresh, filterable residential and ADU permit leads from Baltimore — delivered before your competitors even know.
Informational only, not legal advice. Headline counts reflect all permits Igni has tracked for this jurisdiction; the table shows recent activity. Housing law changes — verify current statutes before relying on this.