Garage conversion rules in Harford County, MD — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
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 garage conversion changes the space to habitable room, so Harford County requires a building permit under its adopted building code. The inspector verifies an egress window for any new bedroom, minimum ceiling height, insulation to the energy code, and interconnected smoke and carbon monoxide alarms. New wiring, heat, or plumbing draw separate electrical and mechanical permits. If the conversion creates a second independent unit, it becomes an accessory dwelling unit under the zoning code, which requires the unit to stay attached to the principal dwelling and, on septic lots, Health Department confirmation of capacity.
Converting a garage to a bedroom without a permit is illegal habitable construction and draws a stop-work order, fines, and a retroactive permit. Missing egress or alarms fails inspection.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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