Texas

Texas Permit Guide for Metal Carports, Garages and Barns

A Texas carport permit comes from the city when your land is inside city limits, because Texas has no single building code that covers the whole state. State law makes the International Residential Code the residential code inside cities, and each city issues its own permits and adds its own amendments. Out in unincorporated county land there is usually no building permit for a carport or garage, but floodplain, septic and, on the coast, windstorm rules can still apply. Where your land sits decides almost everything.

Building code in effect

Under Texas Local Government Code 214.212, the International Residential Code as it existed on May 1, 2012 is the residential building code in every Texas municipality, as amended by House Bill 738 (effective January 1, 2022). Cities may adopt local amendments, including newer IRC editions, but only after a public hearing and by ordinance, so the edition in use differs from city to city. There is no statewide code for detached buildings outside city limits. For new single-family homes and duplexes in certain unincorporated areas, Local Government Code 233.153 points builders to the IRC published as of May 1, 2008 (or the county seat's version), but that law covers houses, not accessory buildings, and does not require county approval before building.

Who issues permits

Inside city limits, the city's building department issues permits. Some cities also enforce their building code in their extraterritorial jurisdiction (ETJ) by ordinance. In unincorporated areas, counties generally do not issue building permits; 233.153 says it may not be read to require prior county approval for new residential construction. Counties still run floodplain development permits, and septic permits come from TCEQ or a local authorized agent, often the county. Zoning, where it exists, is a city matter; most Texas counties have no zoning.

County permit guides

County guides are coming soon.

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When you need a permit

Inside city limits: Expect a building permit for a carport, garage or barn. The IRC exempts one-story detached accessory buildings of 200 square feet or less, but many Texas cities change that number by local amendment, so ask your city.
Unincorporated county land: Usually no county building permit for a carport or garage. You may still need a floodplain development permit if the site is in a mapped flood zone.
Septic and wastewater: If the building has a bathroom or sink tied to a septic system, or sits near an existing system, the on-site sewage facility (OSSF) rules apply. Permits come from TCEQ or the local authorized agent.
Coastal counties: In the 14 first-tier coastal counties and parts of Harris County east of State Highway 146, new structures are built and inspected to TDI windstorm specifications if you want TWIA coverage, with a WPI-8 certificate of compliance.

Farm buildings

Texas has no statewide building code outside cities, so there is no general farm permit to be exempt from in unincorporated areas. Inside city limits, the Texas Right to Farm law was rewritten by House Bill 1750 (effective September 1, 2023). Agriculture Code 251.0055 now limits the 'governmental requirements,' which include license and permit requirements, that a city can place on an agricultural operation, unless the city shows the rule is needed to protect people nearby from specific hazards like flooding or injury. Whether that covers a building permit for a barn is not spelled out, so ask your city. Electrical work and floodplain rules still apply.

Wind and snow

Texas weather runs the full range. The Gulf coast faces hurricanes, North Texas and the Panhandle sit in tornado country with frequent hail, and the Panhandle gets real snow most winters. Coastal buildings in the designated catastrophe area must meet TDI windstorm specifications for TWIA insurance. Ask your city building department, or your county engineer if you are rural, for the design wind speed and ground snow load at your site. Our partnered manufacturers offer certified buildings rated for 140 MPH wind and 35 PSF snow load, and higher ratings can be quoted where required.

Before you order

Check whether your lot is inside city limits, in a city's ETJ, or in unincorporated county land. Each one has different rules.
Look up your site on the county floodplain map. A floodplain permit can apply even where no building permit does.
On the coast, if you want TWIA coverage, line up a TDI-appointed engineer before construction starts so the work can be inspected for a WPI-8.
Ask about deed restrictions or HOA rules. In unincorporated Texas, these are often the only rules on accessory buildings.

Common questions

Do I need a permit for a carport in Texas?
Inside a city, almost always, since cities enforce the IRC and set their own rules for carports. In unincorporated county land there is usually no building permit, but a floodplain permit or coastal windstorm inspection can still apply.

Do I need a permit for a metal garage in Texas?
Inside city limits, yes. Outside cities, Texas counties generally cannot require a building permit, but check for floodplain, septic and deed restriction rules before you build.

Are farm buildings exempt?
Outside cities there is usually no building permit to begin with. Inside cities, Agriculture Code 251.0055 (2023) limits the permit and other requirements a city can put on agricultural operations, so talk to your city about how it applies to a barn.

Do I need a windstorm certificate on the Texas coast?
If you are in one of the 14 first-tier coastal counties or the covered part of Harris County and want TWIA coverage, most new structures need a TDI windstorm certificate of compliance.

Sources

Permit rules change. Always confirm with your local permit office before you build.

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