Alteration of HVAC (Commercial/Residential)

Plan Review
Not Required
2% of total job cost plus $45.03
Admin fee
Valid Period
180 days
Processing Time
up to 1 hour
Houston Public Works

1002 Washington Ave., 4th Floor
Houston, TX 77002

8 am to 4:30 pm


Applicants who wish to modify or alter an existing HVAC system by adding/removing parts or equipment must obtain a mechanical permit. 

Conditions & Exceptions

Plan review may be required depending on the scope of work.

What You Need

Licensed contractors seeking a permit to alter an existing HVAC system must register their license with the City of Houston and should be prepared to provide a completed copy of the iPermits Acknowledgement Form if they are a first-time user of the iPermits system.  

Apply Online

To apply for a mechanical permit online:

  1. Log in or register for an iPermits account,
  2. Complete a mechanical permit application in the iPermits portal,
  3. Pay any applicable fees associated with the application, and
  4. Print the permit. 

NOTE: If the mechanical permit is associated with a dangerous building or habitability project, a Mechanical Permit Application must be completed and submitted via email at [email protected]

Apply by Email

Only Available to Advance Pay Account holders

To apply for a mechanical permit by fax, please have your registered mechanical contractor send a completed copy of the CE-1017 Mechanical Building Permit Application to 832.395.9601.

What You Need

NOTE: The submittal, review and approval of plans may be required for some types of projects. Please contact the Mechanical Section at 832.394.8850 or [email protected] for more information.  

Submit Plans Online

All plans must be submitted electronically. To submit your plans for review, follow these steps:

1. Log in or register for an iPermits account.

2. Complete a permit application in the iPermits portal.

3. Pay any applicable fees associated with the application.

4. After permit fees have been paid, you will receive an invitation to upload plans into ProjectDox.

5. Upload all required documents and drawings to ProjectDox. 

6. Mark the assigned task "complete" to finalize your plan submission.

For a complete and detailed list of steps, please refer to the EPR User Guides at

Additional Resources
What You Need

Please keep a copy of the permit and the approved copy of the plans (if applicable) on-site for inspection. If corrections are required, you will need to reschedule the inspection. 


Schedule Online

To schedule an inspection online:

1. Access our scheduling website through the link below.

2. Enter the appropriate project number into the field and click the Submit button.

3. Select the appropriate permit type from the drop-down box and click the Submit button.

4. Click on the "Request" link.

5. Select the type of inspection(s) that you wish to schedule by clicking on the text box besides it/them.

6. Enter your license number (digits only) and scheduling PIN number and click the Submit button.

Schedule by Phone

To schedule an inspection using our Interactive Response System, please call 713.222.9922 and follow the prompts. To save time, please have you project number and scheduling PIN available.

Conditions & Exceptions

In order to schedule an inspection, the mechanical contractor's license registration must be in good standing.

Prior to scheduling an inspection, please make sure that the permit is not inactive and that all holds (if any) have been approved.

Please note that inspections that repeatedly fail may be charged a re-inspection fee in addition to an admin fee.