Tiny home rules in Baltimore County, MD — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Baltimore County has no separate tiny-home zoning category. A tiny house on a permanent foundation can qualify only as an accessory apartment in a detached accessory building under BCZR 400.4, capped at 1,200 sq ft (1+ acre) or 800 sq ft (smaller lots), family-occupied, with a Special Hearing.
There is no distinct tiny-home ordinance in Baltimore County. A tiny dwelling would be regulated as an accessory apartment under BCZR Section 400.4 if in a detached accessory building on an owner-occupied lot, subject to a Special Hearing and Use Permit. Its size may not exceed 1,200 square feet on a lot of one acre or more, or 800 square feet on a smaller lot, and it must be clearly smaller than the principal dwelling. Occupancy is limited to family members, separate utility meters are generally prohibited, and the structure must meet Section 400 height, location, size, and setback rules. Movable tiny houses on wheels are treated as trailers/mobile homes and are not permitted as permanent dwellings in most residence
Occupying an unpermitted tiny dwelling or exceeding the size or occupancy limits is a zoning violation subject to PAI enforcement and Use Permit termination.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Baltimore County's tiny homes rules stack up against other locations.
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