Accessory Structures in Harris County, TX (2026)

5 county-level rules, plus city-specific rules for 8 cities in Harris County, Texas.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Harris County. If you live within an incorporated city, that city's own rules apply — see the city list below.

ADU Rules

Harris County has no ADU-specific ordinance for unincorporated areas. Accessory dwelling units are not restricted by county zoning (counties cannot zone). Building permits are required. Deed restrictions and HOA rules commonly prohibit ADUs in subdivisions.

Harris County ADU Rules (Unincorporated)

Few Restrictions

Full ordinance details →Official source ↗

Shed Rules

Detached sheds 200 square feet or less may be exempt from building permits in unincorporated Harris County. Larger structures require permits. Sheds in the floodplain may need floodplain development permits. Sheds cannot be built in utility or HCFCD drainage easements.

Harris County Shed Rules (Unincorporated)

Some Restrictions

Full ordinance details →Official source ↗

Garage Conversions

Garage conversions to living space in unincorporated Harris County require building permits for the change of use. Electrical, plumbing, and HVAC modifications need separate permits. The county has no requirement to replace lost parking spaces. Deed restrictions may prohibit conversions.

Harris County Garage Conversion Rules (Unincorporated)

Some Restrictions

Full ordinance details →Official source ↗

Carport Rules

Unincorporated Harris County has no zoning regulations for carports. Construction must comply with the Harris County fire code based on the 2021 IFC. Carports attached to structures may require a fire code inspection. Subdivision deed restrictions commonly regulate carport placement and materials.

Accessory Structures: Carport Rules

Few Restrictions

Full ordinance details →Official source ↗

Tiny Homes

Unincorporated Harris County has no zoning restrictions on tiny homes. Structures must comply with the Harris County fire code and any applicable building standards. Tiny homes on wheels may be classified as RVs under state law. Subdivision deed restrictions commonly restrict tiny homes.