Public permit data

Maryland building permits, by the numbers.

Permits from Anne Arundel, Baltimore, Baltimore City, Carroll, Frederick, Howard, Prince George's, and Washington DC counties, sorted by trade, zip code, and project type. Refreshed every Monday.

1517415
Total permits indexed
8
Counties covered
14
Trade categories
10
Top zip codes by activity
Geographic coverage
Permits by county
All permits in the database, grouped by county.
Trade breakdown
Permits by trade
Counts across every permit on file. Trades include solar, electrical, HVAC, pool, deck and outdoor, landscaping, renovations, new construction, and general contracting. One permit can carry more than one trade, so these totals run higher than the permit count above.
Geographic activity
Most active zip codes
Top 10 zip codes over the last 52 weeks, among permits with a linked parcel. Zip codes come from the parcel record, so permits without a matched parcel are left out.
All counties Washington DC Baltimore City Baltimore County Howard County Frederick County Carroll County Anne Arundel County Prince George's County
# Zip code County Permits
1 20011 Washington DC
5362
2 20002 Washington DC
5274
3 20020 Washington DC
3505
4 20001 Washington DC
3409
5 20019 Washington DC
3093
6 21230 Baltimore City
2750
7 21042 Howard County
2721
8 20016 Washington DC
2663
9 21122 Anne Arundel County
2586
10 21215 Baltimore City
2545
Weekly permit activity
Permits by county, by week
Plumbing permits across all counties, 52-week rolling view.
County All Washington DC Baltimore City Baltimore Howard Frederick Carroll Anne Arundel Prince George's
Trade All Plumbing Electrical Gas HVAC Interior Structural Solar Exterior Accessory Structure Fire Protection Pool and Spa Sign Site
Data freshness
Permit date range by county
Oldest and newest permit on record for each county.
County Oldest permit Newest permit Span
Anne Arundel County Dec 11, 2025 Sep 6, 2026 8 months, 3 weeks
Baltimore City Jan 1, 2019 Sep 5, 2026 7 years, 8 months
Baltimore County Jan 4, 2021 Sep 5, 2026 5 years, 8 months
Carroll County Apr 23, 2021 Sep 5, 2026 5 years, 4 months
Frederick County Aug 1, 2021 Sep 5, 2026 5 years, 1 month
Howard County Aug 1, 2021 Sep 6, 2026 5 years, 1 month
Prince George's County Aug 25, 2026 Sep 6, 2026 1 week, 5 days
Washington DC Jan 1, 2009 Aug 30, 2026 17 years, 7 months

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