Public permit data

Maryland building permits, by the numbers.

Permits from Carroll, Howard, and Frederick counties, sorted by trade, zip code, and project type. Refreshed every Monday.

38760
Total permits indexed
4
Counties covered
13
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 among permits with a linked parcel in Carroll County. Zip codes come from the parcel record, so permits without a matched parcel are left out.
All counties Baltimore County Howard County Frederick County Carroll County
# Zip code Permits
1 21784
478
2 21157
454
3 21158
195
4 21771
154
5 21074
128
6 21048
117
7 21787
98
8 21102
97
9 21776
46
10 21797
44
Weekly permit activity
Permits by county, by week
HVAC permits in Carroll County, 52-week rolling view.
County All Baltimore Howard Frederick Carroll
Trade All Electrical Plumbing HVAC Structural Gas Interior Accessory Structure Solar Fire Protection Pool and Spa Site Sign
Data freshness
Permit date range by county
Oldest and newest permit on record for each county.
County Oldest permit Newest permit Span
Baltimore County Jan 2, 2026 Jul 18, 2026 6 months, 2 weeks
Carroll County Jan 1, 2026 Jul 19, 2026 6 months, 2 weeks
Frederick County Mar 31, 2026 Jul 19, 2026 3 months, 2 weeks
Howard County Mar 1, 2026 Jul 19, 2026 4 months, 2 weeks

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