Title 24 Reports in Sacramento County
Sacramento County is entirely one climate zone. The line that matters is just outside it, along the Placer County boundary.
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Uniform inside, different immediately outside
From the central grid of the city out through Natomas, Elk Grove, Rancho Cordova, Citrus Heights, Folsom, Galt and the Delta communities, the assignment does not change. Nor does it in the unincorporated areas — Arden-Arcade, Rosemont, North Highlands, Antelope, Orangevale, Fair Oaks.
The zone the county sits in is the largest in the state by ZIP count, and it extends well beyond the county: west into Yolo and Solano, and south down the valley through San Joaquin and Stanislaus.
Where projects get caught
At the north-eastern edge. Roseville, Rocklin, Granite Bay, Lincoln and Auburn are in Placer County and in a different zone. So are Marysville, Yuba City and Chico further north. A contractor running comparable houses in Natomas and in west Roseville is working to two different sets of figures despite the sites being twenty minutes apart.
Inside the county, then, the zone needs no investigation. The moment a job crosses the line it does.
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 Sacramento County
Sacramento County contains California climate zone 12. 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.