There are presently 17 Baltimore County Historic Districts. Under County law, the agreement by the owners of 75 percent of the property within a proposed district’s boundary is required to form a local historic district. Details about the process for enacting a district are provided in the Historic District FAQ.
As with Landmarks List structures, any exterior modification or addition to a structure in a district, or any excavation, building, or demolition permit, is subject to approval by the Landmarks Preservation Commission. Significantly, the Commission’s authority within a County historic district includes the site surrounding and adjoining the individual structures, which may be important in maintaining the sense of historic character.