Baltimore County building & ADU permits
Recent permit activity, updated continuously.
Baltimore County nearly surrounds Baltimore City, which is a separate jurisdiction, and has no incorporated municipalities of its own, so the county itself permits communities such as Towson, Catonsville and Dundalk. Igni reads the county’s issued permits from its own GIS server and reverse-geocodes the few records that arrive without a ZIP.
Igni is tracking 1,466 residential and building permits in Baltimore County, MD. The most active ZIP is 21220. The most recent filing Igni tracked was Nov 11, 2026. All records come from Baltimore County GIS — Cityworks permits (ArcGIS), an official government open-data feed, and are refreshed continuously.
1466
Permits tracked
0
ADU permits
39
Distinct ZIP codes
Nov 11, 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 |
|---|---|---|---|---|
| 21207 | Commercial | — | $20,000 | Mar 22, 2026 |
| 21220 | Commercial | — | $1,570,610 | Sep 28, 2026 |
| 21228 | Commercial | — | $56,000 | Jul 16, 2026 |
| 21219 | Commercial | — | $1,200,000 | Oct 20, 2026 |
| 21222 | Residential | — | $35,000 | Apr 2, 2026 |
| 21153 | Residential | — | $250,000 | Oct 1, 2026 |
| 21133 | Residential | — | $75,000 | Oct 13, 2026 |
| 21030 | Residential | — | $5,000 | Sep 24, 2026 |
| 21043 | Residential | — | $95,000 | Apr 10, 2026 |
| 21087 | Residential | — | $8,000 | Sep 22, 2026 |
| 21220 | Residential | — | $39,606 | Sep 4, 2026 |
| 21221 | Residential | — | $45,510 | Sep 21, 2026 |
| 21120 | Residential | — | $500 | Sep 24, 2026 |
| 21131 | Residential | — | $29,000 | Sep 21, 2026 |
| 21220 | Residential | — | $37,000 | Nov 3, 2025 |
| 21221 | Residential | — | $5,000 | Jan 26, 2026 |
| 21221 | Residential | — | $50,000 | Jun 8, 2026 |
| 21219 | Residential | — | $5,000 | Jun 23, 2026 |
| 21220 | Residential | — | $10,000 | Jul 14, 2026 |
| 21222 | Residential | — | $50,000 | Sep 3, 2026 |
Top ZIP codes by recent activity
Permit activity in Baltimore County
Igni counted 10,052 permits issued in Baltimore County over the last 12 months (Nov 2025 – Oct 2026) — down 4.5% on the 10,526 in the 12 months before. The forecast expects about 5,028 over the next 6 months.
The source's volume stepped up around March 2023 (×1.5) — likely a change in what the city publishes, so we don't compare year over year across it.
Forecast: trailing mean, typical error ±8% in backtests one to six months ahead. How we forecast
| Permit type | Last 12 months | Year over year | Forecast, next 6 months |
|---|---|---|---|
| All permits | 10,052 | Down 4.5% | ≈ 5,028 |
| Residential building | 5,804 | Flat (+0.5%) | ≈ 2,904 |
| Commercial building | 1,779 | Up 7.2% | ≈ 888 |
| Trade (electrical, plumbing, mechanical) | 2,469 | Down 20.1% | ≈ 1,236 |
| ADU | 9 | —* | — |
* No year-over-year figure: the source's volume for this permit type stepped up within the last two years — likely a change in what the city publishes — so the two 12-month windows are not comparable.
Monthly figures
| Month | Permits | 10th–90th percentile |
|---|---|---|
| Nov 2023 | 722 | — |
| Dec 2023 | 721 | — |
| Jan 2024 | 568 | — |
| Feb 2024 | 639 | — |
| Mar 2024 | 682 | — |
| Apr 2024 | 804 | — |
| May 2024 | 872 | — |
| Jun 2024 | 808 | — |
| Jul 2024 | 1,072 | — |
| Aug 2024 | 894 | — |
| Sep 2024 | 733 | — |
| Oct 2024 | 998 | — |
| Nov 2024 | 799 | — |
| Dec 2024 | 765 | — |
| Jan 2025 | 583 | — |
| Feb 2025 | 617 | — |
| Mar 2025 | 669 | — |
| Apr 2025 | 860 | — |
| May 2025 | 1,027 | — |
| Jun 2025 | 897 | — |
| Jul 2025 | 1,055 | — |
| Aug 2025 | 1,011 | — |
| Sep 2025 | 986 | — |
| Oct 2025 | 1,257 | — |
| Nov 2025 | 862 | — |
| Dec 2025 | 791 | — |
| Jan 2026 | 651 | — |
| Feb 2026 | 712 | — |
| Mar 2026 | 846 | — |
| Apr 2026 | 881 | — |
| May 2026 | 913 | — |
| Jun 2026 | 930 | — |
| Jul 2026 | 793 | — |
| Aug 2026 | 955 | — |
| Sep 2026 | 827 | — |
| Oct 2026 | 891 | — |
| Nov 2026 (forecast) | ≈ 838 | 638–873 |
| Dec 2026 (forecast) | ≈ 838 | 641–873 |
| Jan 2027 (forecast) | ≈ 838 | 674–874 |
| Feb 2027 (forecast) | ≈ 838 | 679–875 |
| Mar 2027 (forecast) | ≈ 838 | 734–878 |
| Apr 2027 (forecast) | ≈ 838 | 744–885 |
Counts are permits issued per calendar month as Baltimore County publishes them to its open-data feed — not a complete census; a change in what the city publishes moves them too. The current month is left out, and the most recent months are provisional. A forecast is a statistical estimate with a range, not a prediction for any project. Informational only.
How long do permits take in Baltimore County?
Based on 27,117 Baltimore County permits applied for between Nov 2023 and Aug 2026, the typical (median) permit was issued 31 days after application, and the middle half of permits took 20–66 days. One in ten took longer than 189 days.
| Permit type | Median | Typical range | Permits |
|---|---|---|---|
| All permits | 31 days | 20–66 days | 27,117 |
| Residential building | 31 days | 20–76 days | 15,293 |
| Commercial building | 64 days | 34–149 days | 4,403 |
| Trade (electrical, plumbing, mechanical) | 24 days | 15–35 days | 7,421 |
| ADU | 83 days | 34–200 days | 32 |
Typical, not guaranteed: individual permits vary with project scope, application completeness and plan-review workload. Days are calendar days from application to issuance; applications still pending are counted as not-yet-issued rather than dropped. Informational only, not legal advice. How we calculate approval times.
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 Baltimore County GIS — Cityworks permits (ArcGIS). Public records (MD PIA).
Nearby cities — Maryland
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Baltimore County permit records into leads.
Baltimore County permit data — FAQ
Where does Igni get Baltimore County permit data?
How fresh is Baltimore County permit data?
How long does it take to get a building permit in Baltimore County?
Is construction activity growing in Baltimore County?
Does Baltimore County allow accessory dwelling units (ADUs)?
Get permit leads — Baltimore County
Fresh, filterable residential and ADU permit leads from Baltimore County — 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.