Title 24 Reports in San Francisco County
San Francisco is California's only consolidated city and county. There is no unincorporated territory, no second building department, and one climate zone throughout.
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City and county are the same thing
That removes a question that arises nearly everywhere else in the state. There is no unincorporated San Francisco County sitting outside the city with its own process, so every project in the county answers to the same authority. Anyone used to checking whether a site is inside city limits can skip the step here.
The zone is equally settled: every ZIP in the city and county carries the same assignment, from the waterfront up to the highest points of Twin Peaks.
Where it changes is outside
South down the peninsula the zone holds — Daly City, Brisbane, South San Francisco, San Bruno, Pacifica. North across the Golden Gate it holds through Sausalito, Mill Valley, Tiburon and Corte Madera, and then stops: Larkspur, immediately next to Corte Madera, is a different zone, as are San Rafael, Fairfax and Novato.
What actually shapes projects here
Not the zone but the building stock. The county is effectively built out, so nearly all residential work is alteration or addition to an existing building rather than new construction, and the compliance route follows from that.
City and unincorporated permitting
A project inside a city's limits is permitted by that city. A project on unincorporated land is permitted by the county instead, and the two can run different submittal processes even where the energy requirements are identical. The California Energy Code itself is statewide — what changes locally is the climate zone the site falls in and how the jurisdiction wants the compliance documents presented.
The zone is confirmed from the project address as a matter of course, but in this county the answer does not change from one address to the next.
Climate zone in San Francisco County
San Francisco County contains California climate zone 3. The zone drives the insulation, glazing and equipment performance a report has to demonstrate, and it is confirmed from the project ZIP code against the Energy Commission's published table.