Garage conversion rules in Houston, TX — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Houston allows garage conversions to living space or ADUs with a building permit. Converting to an ADU requires 3 total off-street parking spaces. Over-garage ADUs that preserve parking below are a popular alternative.
Garage conversions to living space or ADUs are permitted in Houston with a building permit from the Houston Permitting Center. If converting to an ADU, the property must still provide the required off-street parking: two spaces for the primary residence plus one for the ADU (three total). Since the garage spaces are lost in a conversion, alternative parking must be provided on improved surfaces. Over-garage ADUs (building a second story above an existing garage) are a popular alternative that preserves the parking spaces below. The garage structure must be reinforced to support the weight of a second story. Conversions must meet current building code including egress, fire safety, and electrical and plumbing requirements. Properties in historic districts require a Certificate of Appropriateness. Deed restrictions may prohibit conversions.
Conversion without permit: stop-work order. Insufficient parking: code violation. Deed restriction violations: civil enforcement.
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Side-by-side rule comparisons with other cities in Harris County.
See how other cities in Harris County handle garage conversions.
See how Houston's garage conversions rules stack up against other locations.
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