5 rules for unincorporated Harford County, Maryland.
Verified from official government sources
Maryland has no statewide ADU mandate, so Harford County zoning controls. One accessory dwelling unit is allowed in the AG, RR, R1 through R4, RO, and VR districts, but it must be attached to or inside the principal house.
COMAR 26.04.02.03
A person may not construct or attempt to construct an on-site sewage disposal system without first receiving a permit from the Approving Authority.
Harford County is stricter than most: a building permit is required for every residential accessory structure, including sheds, before construction starts. A prefabricated shed under 200 square feet skips only the construction plans, not the permit.
Harford County Shed/Detached Garage Permit Requirements
Building permits must be secured for all residential accessory structures prior to starting construction. Prefabricated sheds require permits prior to placement on the property.
Turning a garage into living space in Harford County is a change of use that needs a building permit. The Division of Building Services checks egress, ceiling height, insulation, and interconnected smoke and carbon monoxide alarms before signing off.
A carport is a roofed accessory structure, so Harford County requires a building permit before construction. The Division of Building Services reviews it, and zoning setbacks control how close it can sit to the lot lines.
Harford County Shed/Detached Garage Permit Requirements
Building permits must be secured for all residential accessory structures prior to starting construction. Prefabricated sheds require permits prior to placement on the property.
A tiny home's fate in Harford County turns on its foundation. On a permanent foundation it is a dwelling under the building code and, on septic, needs a Health Department sewage permit; on wheels it is an RV, not a permanent home.
COMAR 26.04.02.03
A person may not construct or attempt to construct an on-site sewage disposal system without first receiving a permit from the Approving Authority.
See every category we cover for Harford County — parking, noise, fences, fires, animals, pools, and more.
Harford County Ordinance Hub →