Building permits in Maryland
1 jurisdictions, each with the department that issues, its portal and its phone number. Cities issue their own permits; counties cover unincorporated areas, which is the distinction that sends most contractors to the wrong office.
1 checked against the department's own page
Licensing
An MHIC contractor license is required for anyone performing home improvement (alteration, remodeling, repair, or replacement) on a residence; salespersons and subcontractors also need MHIC credentials.
Maryland Home Improvement Commission (MHIC) — Maryland Dept. of Labor