Arlington, TX Accessory Structures: Garage Conversions (2026)

Arlington permits garage conversions to habitable space but treats them as substantial remodels requiring full permit review and inspection. Applicants must submit plans showing new floor framing and insulation, ceiling height of 7 feet minimum in habitable rooms, proper egress (bedrooms need a window at least 5.7 square feet meeting IRC sizing), HVAC extension from the main system or a separate unit, GFCI and AFCI electrical compliance, smoke and carbon monoxide detectors, and proper moisture and thermal envelope upgrades where the garage door opening is filled in. Arlington zoning typically requires a minimum number of enclosed or covered off-street parking spaces per dwelling, so converting the garage means the required parking must be replaced elsewhere on the lot, usually through construction of a new carport or relocation of driveway. If the conversion creates a separate dwelling unit with its own kitchen and entrance, it becomes an ADU subject to the UDC's ADU rules, which may require a Specific Use Permit. HOA deed restrictions commonly prohibit garage conversions because they alter exterior character and reduce apparent home value; many Arlington HOAs require architectural committee review and may deny conversions outright. Unpermitted conversions discovered during resale create significant problems for appraisals and inspections and may need to be reverted or retroactively permitted. Building without permits risks stop-work orders, fines, and forced removal of unapproved work.