Wayne County, MI Accessory Structures: Garage Conversions (2026)

Converting a garage to habitable living space in Wayne County, Michigan requires a building permit from the local municipality and compliance with the Michigan Residential Code, including proper insulation, egress windows, heating, ventilation, and electrical upgrades. A key obstacle is local zoning: most Wayne County cities impose minimum off-street parking requirements (typically 1 to 2 spaces per dwelling unit), and converting the garage often eliminates required parking. Homeowners must usually add a driveway extension, parking pad, or demonstrate available street parking before the conversion is approved. Detroit, Dearborn, Livonia, and most suburbs require that the exterior appearance be altered to remove the garage door and install residential windows, framing, and siding consistent with the house. Converting a detached garage into a full ADU or coach house is treated under local ADU rules (see ADU entry); many cities permit rec rooms or offices in detached garages without ADU approval as long as no kitchen or sleeping area is added. Tax assessment typically increases after conversion because livable square footage increases.