Permit Required?
Required
Typical Fee Range
$250–$500
A Mechanical Permit is required for system replacements; fees include a base amount plus a technology surcharge.
Fee Method
Valuation-based
What's Required in San Francisco
- Permit required for replacement or installation of any HVAC unit, furnace, or heat pump
- Proper venting and gas line safety checks are mandatory for replacements
- Manual J sizing calculations and Title 24 energy compliance forms may be requested
- Secondary drain pans and safety switches required for attic installations
- Contractors must have a valid CA license and SF business tax certificate to pull permits online
- Final mechanical inspection mandatory upon installation to verify safe operation
How to Get a HVAC Permit in San Francisco
1
Step 1: Portal Filing
Registered contractors apply for a 'Mechanical Permit' via PermitSF.
2
Step 2: Equipment Details
Enter the model number, BTU rating, and efficiency specs of the new unit.
3
Step 3: Fee Payment
Pay the valuation-based permit fee (typically $250–$500) online.
4
Step 4: Installation
Complete the installation per the California Mechanical Code.
5
Step 5: Inspection
Schedule a final mechanical inspection through the DBI online system.
Frequently Asked Questions
Yes, a mechanical permit is mandatory for any AC system replacement.
Standard residential HVAC permits typically cost $250–$500.
Yes, for their primary residence if they perform the work themselves, though technical skills are required for compliance.