Houston permits ADUs (locally called garage apartments or quarters) through the Houston Permitting Center. With no zoning ordinance, ADUs are regulated by Chapter 42 development code, building code, and deed restrictions. Building permits are required for all habitable accessory structures.
Houston is the largest US city without zoning, so ADU regulation works differently than in California or Oregon. ADUs are reviewed under Chapter 42 of the Code of Ordinances and the Houston Amendments to the IRC. Houston has a long tradition of garage apartments in older neighborhoods like the Heights and Montrose. Applicants file through the Houston Permitting Center online portal. Required submissions include site plan, floor plans, structural drawings sealed by a Texas-licensed design professional for two-story units, and Harris County deed restriction verification. Setbacks: typically 3 feet side and rear under Chapter 42 Article III. Flood zones need a separate floodplain permit. Plan review takes 14-21 business days.
Building an ADU without permits results in stop-work orders, doubled permit fees, and fines up to $2,000 per day under Chapter 10. Deed restriction violations are enforced civilly through the Houston Legal Department or by HOAs.
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