Permit Required? Required
Typical Fee Range $76–$250 A $75 base fee + $1 surcharge per unit; applies to furnace or A/C replacements.
Fee Method Flat rate
Apply Online Apply at Houston Permitting Center →

What's Required in Houston

  • A mechanical permit is required for any HVAC unit replacement (A/C, furnace, or boiler).
  • Proper secondary drain pan and safety float switches must be installed for attic units.
  • Manual J load calculations required for new system sizing to ensure energy efficiency.
  • Condenser units must be anchored to a level pad and meet property line setbacks.
  • Replacement of identical gas lines or ductwork alterations also require mechanical permits.
  • Must be performed by a State of Texas licensed Mechanical/AC contractor.

How to Get a HVAC Permit in Houston

1

Step 1: Contractor Check

Verify the contractor's 2026 license and city registration.

2

Step 2: iPermits Filing

Submit a 'Mechanical Permit' application via the online portal.

3

Step 3: Fee Payment

Pay the $76 base fee per unit plus the $33.56 administrative fee.

4

Step 4: Installation

Install the unit ensuring proper drainage and venting to code.

5

Step 5: Inspection

Schedule a final mechanical inspection through the iPermits system.

Frequently Asked Questions

Usually about $110 total including the per-unit fee and administrative charge.
Only if the project valuation exceeds $15,000 for residential equipment.
Only if you are a licensed professional or an owner-occupant with proven technical ability.