Fremont furnaces, done to the code the city adopted

Here is the Fremont rule in plain words, and a Fremont attic furnace we have been in.

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City permit rule

Fremont Municipal Code 15.15.020

What Fremont requires

Fremont adopted the 2025 Edition of the California Mechanical Code as its mechanical code, with the city's own amendments.

The 2025 Edition of the California Energy Code is adopted without amendments.
Start permit work without the permit and Fremont charges double the normal permit fee.

Checked in Fremont's municipal code, November 2026.

Fremont

Mon to Fri, 8 AM to 5 PM

CSLB license 1162030, class C20, active.

Fremont Municipal Code 15.10

A furnace swap done without a permit can cost you twice on the fee alone, before anyone looks at the work. Do it right the first time.

Fremont Municipal Code 15.10, Section 109.4
Checked November 2026
Bay Area Air District

Fremont is in Alameda County, inside the Bay Area Air District.

Bay Area Air District, Building Appliances Rule Implementation Checked November 2026
California Energy Commission

Statewide, a Fremont permit applied for on or after January 1, 2026, is held to the 2025 Energy Code.

California Energy Commission Checked November 2026