Accessory Structures in Houston, TX: What Residents Actually Need to Know

If you live in Houston or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Houston has 2 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Rules

Houston has no zoning, so it does not regulate accessory dwelling units citywide by right, setback, or unit cap; a garage apartment outside a historic district needs only a building permit under Chapter 10 and the building lines Chapter 42 sets in platting. Inside one of the city's protected historic districts, § 33-241.1(c)(5)a lets planning staff approve a freestanding garage apartment of 600 square feet or less at the rear of the lot without a full historic commission hearing.

Key details: Governing section: § 33-241.1(c)(5)a, Historic Preservation Ordinance. Size cap: 600 sq ft footprint, rear of lot only. Approval path: Administrative, no HAHC hearing required. Applies only in: City-designated historic districts, not citywide. Penalty: $50-$500 per day, § 33-203(c).

Building a garage apartment or other accessory structure in a historic district without the required certificate of appropriateness is a misdemeanor under § 33-203(c): a fine of $50.00 to $500.00 for each violation, with every day the unauthorized structure stands counting as a separate offense. The building official is also barred from issuing any building permit for the site until the work is brought into compliance or the commission issues a certificate of remediation under § 33-203(e).

Shed & Carport Rules

Houston has no zoning code, so there is no shed size cap or district setback. Chapter 42's building-line rule instead bars any structure needing a building permit from sitting inside the platted line, and Chapter 10 requires sheds and garages be kept structurally sound.

Key details: Local street building line: 20 feet, single-family (§42-150 chart). Major thoroughfare building line: 25 feet minimum. Shed size cap: None set citywide: no zoning. Maintenance duty: Structurally sound, good repair (§10-363). Deed restrictions: Can require a bigger setback.

Building a shed inside the required building line, or letting one fall into disrepair, can draw a Chapter 10 property-maintenance citation and, where a permit was required, a stop-work order from the city's permitting office.

The Bottom Line

Houston's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Houston is broadly strict or permissive.

Keep in mind that Houston can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.