What's Required in Houston
- Replacement of residential a/c requires a mechanical permit and inspection (HPC Mechanical Inspections)
- Any repair, replacement, alteration or installation of mechanical equipment requires a permit (Top 10 sheet)
- Permit pulled by an A/C contractor with a TDLR Class A or B license registered with the city (form CE-1307); homeowner in some instances
- Complete system: $11.41 per ton + $47.00; alterations 2% of valuation + $47.00; $91.06 minimum; + $33.56 admin
- New wiring needs a separate electrical permit by a registered master electrician; gas piping a gas permit by a registered master plumber
- Replacement equipment and ducts must meet the Texas energy code
- Inspection required; registration must be in good standing to schedule it; inspections completed the next business day
- Alteration permit valid 180 days
Do You Need a Permit to Replace an AC or Furnace in Houston?
Yes, for every replacement. The Houston Permitting Center's mechanical inspections guidance states that replacement of commercial or residential a/c requires a mechanical permit and inspection, and the Building Code Enforcement Top 10 sheet puts the general rule in one sentence: any work done to repair, replace, alter or install mechanical, electrical and plumbing equipment requires a permit, and that work must in general be performed by a licensed person. Houston has no local exemption for a like-for-like condenser or furnace swap. What it does have is a state energy code that the Top 10 sheet says governs air-conditioning equipment and ducts, so the replacement equipment must meet current efficiency requirements.
Houston HVAC Permit Rules by Scenario
| What you are doing | City filing | Rule |
|---|---|---|
| Replacing the condenser, air handler or furnace | Mechanical permit by a registered A/C contractor, with inspection | HPC Mechanical Inspections; Top 10 sheet item 1 |
| New complete system: cooling equipment, air handler and ducts in the same building | Mechanical permit at $11.41 per ton plus $47.00 | 2026 fee schedule, HVAC fees |
| Altering an existing system: adding or removing parts or equipment | Alteration of HVAC permit at 2% of job cost plus $47.00 | HPC Alteration of HVAC (HPWCODE 1019) |
| Window or self-contained unit installed as equipment | Self-contained units are priced at $11.41 per ton plus $47.00 on the mechanical permit | 2026 fee schedule, HVAC fees |
| New circuit or disconnect for the equipment | Separate electrical permit by a registered master electrician | HPC Electrical permits |
| Gas line to a new furnace | Gas permit and inspection by a registered master plumber ($45.53 up to 4 openings) | 2026 fee schedule, plumbing fees |
| Homeowner replacing their own A/C | The guide says a homeowner may obtain the mechanical permit in some instances; confirm with the Mechanical Section | Residential Permitting 101, licensing |
How Much Does an HVAC Permit Cost in Houston?
The 2026 Building Code Enforcement fee schedule sets a $91.06 minimum permit fee for HVAC and prices a complete air-conditioning system, where the cooling equipment, air-handling equipment and duct system are in the same building, at $11.41 per ton plus $47.00. A 3-ton system is $81.23, which rounds up to the minimum, and a 5-ton system is $104.05; add the $33.56 administrative fee and the permit is about $125 to $138. Repairs or alterations to an existing system are 2.0 percent of valuation plus $47.00 with the same minimum, so a $6,000 alteration is $167 plus admin, about $201. Air-handling and duct systems fed from an external source, and cooling equipment located in a different building, are $6.04 per ton plus $47.00. Processing on the alteration permit is listed at up to one hour and the permit is valid for 180 days. The contractor's price for the equipment and the work is separate.
Who Pulls an HVAC Permit in Houston?
An air conditioning contractor holding a Class A or B license from the Texas Department of Licensing and Regulation who has registered that license with the City of Houston, using the Registration Form for State Air Conditioning License (CE-1307) with identification and a certificate of insurance naming the licensee. The registration must be in good standing to schedule an inspection. The Residential Permitting 101 guide adds that in some instances a homeowner may obtain the mechanical permit, without listing the instances; the Mechanical Section at 832-394-8850 is the place to confirm. Houston does not license general contractors, so the mechanical permit is the only license check on a replacement job, apart from the master electrician's permit for any new wiring.
Energy Code and Inspection
Texas' energy code covers air-conditioning equipment and ducts, so replacement equipment is reviewed against current efficiency and duct requirements. The inspection is required and, like all Houston construction inspections, is completed the next business day after the request. For a new home or an addition the city separately requires a residential A/C utility release before the utility energizes the equipment.
How to Get a HVAC Permit in Houston
Hire a registered A/C contractor
TDLR Class A or B license registered with the City of Houston; ask to see the registration.
Contractor pulls the mechanical permit
$11.41 per ton plus $47.00 for a complete system, or 2 percent plus $47.00 for an alteration, $91.06 minimum, plus $33.56 admin.
Pull the related permits
Electrical permit by a registered master electrician for a new circuit; gas permit by a registered master plumber for a new gas line.
Install to the energy code
Equipment and ducts are reviewed against the Texas energy code.
Inspect
Request the inspection; it is completed the next business day. Keep the permit on site.