Do I need a permit for an HVAC or AC replacement in San Francisco, CA?

Yes. Cutting into or replacing pipes carrying gas, hot air or cool air needs a plumbing/mechanical permit, applied for online by a licensed contractor.

What changes the answer

• Licensed contractor

Cost

Fee not extracted; see the DBI fee schedules. Unverified, confirm locally

Fee source: https://www.sf.gov/where-to-apply-for-your-permit

Where to apply

San Francisco Department of Building Inspection (PermitSF portal)

Permitting authority: San Francisco Department of Building Inspection (DBI). City and County of San Francisco. Planning Department review may be needed even when DBI does not require a permit, especially for exterior work. See also: how to apply for a building permit.

Official sources

“Apply online for a permit to cut into or replace pipes that transport water, gas, hot air, or cool air without plans.”

Source: https://www.sf.gov/apply-plumbing-and-mechanical-permit

“Contractors must hold a C4, C16, C20, C36, C54, B, or A license to apply for a plumbing or mechanical permit in general.”

Source: https://www.sf.gov/apply-plumbing-and-mechanical-permit

Verified: 2026-10-19 · Status: verified · Confidence: medium