ADU rules in Harford County, MD — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
Harford County permits a single accessory dwelling unit on a lot in the AG, RR, R1, R2, R3, R4, RO, and VR districts. The unit must be physically attached to or located within the single-family detached dwelling, and its purpose is to let a relative live within a family member's principal home. A zoning certificate for the unit is not grounds for a hardship variance. On the many Harford lots served by septic, the county Health Department must confirm the on-site sewage system can handle the added occupancy before a permit issues, under COMAR 26.04.02.03.
Building a detached second dwelling, or adding an unpermitted apartment, violates the zoning code and draws enforcement. Overloading a septic system without Health Department approval is a separate violation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Harford County's adu rules rules stack up against other locations.
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