Garage conversion rules in Galveston County, TX — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
The county cannot zone conversions. In the City of Galveston, an accessory building may not be occupied as living space unless it was constructed and approved for residential use, so a garage-to-living-space conversion needs city permits and inspection.
Because Texas counties lack zoning authority, unincorporated Galveston County has no garage-conversion ordinance; building-code, septic, and floodplain review still apply. In the City of Galveston, LDR Sec. 2.401.F prohibits residential occupancy of accessory buildings not built and approved for it, so converting a detached garage or carport into a dwelling requires a building permit, and it may count as an ADU under Sec. 2.303 (one per lot, subordinate to the main home). League City and Texas City have parallel city rules.
Occupying an unpermitted converted garage is a city code violation; enforcement includes required removal of unapproved living space and daily fines set by the municipality.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Galveston County's garage conversions rules stack up against other locations.
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