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Jurisdiction directory

Maryland home project permits by county

Many Maryland households live outside city limits, where the county building department — not a city — issues the permit. 9 Maryland counties, covering the state's largest jurisdictions, are inventoried here.

Model reviewed August 2026

Counties covered

9

largest jurisdictions first

Municipalities tracked

12

in Maryland

Population covered

5.1M

residents in listed counties

Code basis

Statewide

Maryland Building Performance Standards, based on the IRC

Featured counties

The largest and most active permit jurisdictions in the state.

Montgomery County1,052,000 residents · seat RockvillePrince George's County946,000 residents · seat Upper MarlboroBaltimore County County849,000 residents · seat TowsonAnne Arundel County590,000 residents · seat AnnapolisBaltimore City County565,239 residents · seat BaltimoreHoward County334,000 residents · seat Ellicott CityFrederick County285,000 residents · seat FrederickHarford County262,000 residents · seat Bel AirCarroll County173,000 residents · seat Westminster

All Maryland counties we cover

9 counties, largest first.

Montgomery CountySeat: Rockville · 1,052,000 residentsPrince George's CountySeat: Upper Marlboro · 946,000 residentsBaltimore County CountySeat: Towson · 849,000 residentsAnne Arundel CountySeat: Annapolis · 590,000 residentsBaltimore City CountySeat: Baltimore · 565,239 residentsHoward CountySeat: Ellicott City · 334,000 residentsFrederick CountySeat: Frederick · 285,000 residentsHarford CountySeat: Bel Air · 262,000 residentsCarroll CountySeat: Westminster · 173,000 residents

Sources

Sources & verification

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.