Garage conversion rules in Montgomery County, TX — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage into living space in unincorporated Montgomery County requires a development permit. The county has adopted the 2024 IFC and applicable IBC standards. Subdivision deed restrictions may prohibit garage conversions that change property character.
Any modification converting a garage to living space or habitable area in unincorporated Montgomery County requires a development permit from Environmental Health / Permitting. Montgomery County adopted the 2024 International Fire Code, and construction must comply with applicable International Building Code standards. Conversions may also require HVAC, electrical, and plumbing permits. Subdivision deed restrictions may prohibit garage conversions that would eliminate required covered parking or change the property's character. Contact the permitting office at 936-539-7839.
Unpermitted conversion: building code enforcement. Must bring to code or restore. Safety violations: immediate correction.
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