Texas permitting has a quirk that surprises contractors moving from a state like California: there is no statewide building permit, and Texas counties largely cannot require one for residential work. That means the answer to “do I need a permit?” is almost entirely a question of which city owns the address — and whether the address is inside a city at all.
Inside Houston, Dallas, Fort Worth, Austin, or San Antonio, you pull a mechanical permit like anywhere else. A few miles away in unincorporated county, the same change-out may need no permit whatsoever. This guide walks through who issues your HVAC permit across the major Texas metros, what the state requires no matter where you file, and where the time actually goes.
First: City, ETJ, or Unincorporated County?
Before anything else, pin down the jurisdiction. If the property is inside an incorporated city, that city issues the permit and enforces its adopted code. If it is in unincorporated county, there is often no building-permit requirement at all — Texas counties generally lack the authority to require one for residential construction. A city’s extraterritorial jurisdiction (ETJ) adds a third possibility that can pull an otherwise-rural address back under a specific city’s rules.
Do You Even Need a Permit?
Inside city limits, yes — nearly every Texas city requires a mechanical permit to install or replace heating and cooling equipment, like-for-like change-outs included. Most Texas cities adopt the International Mechanical, Energy, and Residential codes with local amendments. In unincorporated areas the permit requirement frequently disappears, but that does not change the licensing rule below, and it does not eliminate manufacturer or code requirements for a safe install.
Licensing Applies Statewide
Regardless of the permit question, air conditioning and refrigeration work in Texas is licensed statewide by the Texas Department of Licensing and Regulation (TDLR). You need a licensed ACR contractor whether the job is in downtown Dallas or in unincorporated Bexar County. Cities that do require permits will also expect your TDLR license and company registration to be recognized before they issue.
The Major Metros
Houston
The City of Houston requires a mechanical permit for change-outs and runs its own permitting through the Houston Permitting Center. Unincorporated Harris County generally does not require a residential building permit, so an address just outside city limits can have a very different answer than one a block away.
Dallas
The City of Dallas and the surrounding suburbs each operate their own permitting offices and portals. Most residential change-outs are a straightforward mechanical permit, but the issuing office and process change city to city across the metroplex.
Fort Worth
Fort Worth and Arlington run separate permitting departments from Dallas and from each other. As with Harris County, unincorporated Tarrant County addresses typically fall outside building-permit authority.
Austin
The City of Austin is one of the heavier processes in the state, with its own Development Services Department and portal. Confirm whether the address is inside the city, in an ETJ, or in unincorporated Travis County before you file.
San Antonio
San Antonio Development Services issues mechanical permits for change-outs within city limits through its own online system. Bexar County unincorporated areas generally do not require a building permit.
Suburbs & ETJs
The fast-growing suburbs each run independent permitting. A city’s extraterritorial jurisdiction (ETJ) can also change what applies, so an address that looks suburban may still route to a specific city office.
What Slows Texas Permits Down
- City vs. unincorporated confusion. Assuming a permit is required when it is not — or the reverse — wastes a filing or leaves a city job unpermitted.
- License and registration on file. Cities want your TDLR license and business registration recognized before issuing, which can stall a first filing in a new city.
- Every city portal is different. Houston, Dallas, Austin, and San Antonio each run separate online systems with separate logins and record types.
- Austin’s heavier process. Some cities issue over the counter; others route more work through review. It is worth confirming per city rather than assuming.
How Much and How Long
For a standard residential change-out, most Texas cities issue the mechanical permit same day, either online or over the counter, for a modest flat or valuation-based fee. Jobs that pull in electrical work, a service change, or new construction can move into review and take longer. Because the process varies so much between cities — and disappears entirely in some unincorporated areas — assume nothing and confirm by address.
If You File Across Multiple Cities
The pain in Texas is rarely one hard permit. It is running the same change-out through Houston one day and three suburban portals the next, each with its own login, record type, and inspection process — while keeping track of which addresses need no permit at all. That repetitive, per-city filing is exactly what automation handles well. If you also work other markets, our metro Atlanta guide and South Florida guide cover the same city-vs-county problem elsewhere.
We File HVAC Permits Across Texas
Permitio handles the portals, submissions, and follow-up across Houston, Dallas-Fort Worth, Austin, San Antonio, and the surrounding cities — and flags the addresses that do not need a permit at all — so your team does not have to track which office owns each job.
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