Marana, AZ Accessory Structures: Garage Conversions (2026)

The Marana Land Development Code establishes minimum off-street parking requirements for residential uses, typically two spaces per single-family dwelling. Converting an attached garage to habitable space eliminates those covered parking spaces, so the property owner must demonstrate that the minimum parking requirement can still be met through driveway spaces or other on-site parking. A building permit is required for any garage conversion because the work involves changes to the building envelope, potentially new egress windows, electrical upgrades, and HVAC modifications. The conversion must meet the International Residential Code standards adopted by Marana for habitable rooms, including minimum ceiling height, ventilation, natural light, and emergency egress. The converted space must also meet energy code insulation requirements. HOAs in master-planned communities may prohibit garage conversions or require architectural review approval. The town does not have a specific ADU or guest house conversion ordinance that facilitates garage-to-dwelling conversions separately from the standard building permit process.