California Title 24 Locations

We prepare Title 24 energy compliance reports for projects throughout California. Requirements are set by the state Energy Code, so the standards are the same statewide — what changes locally is the climate zone your project sits in and how each building department handles submittals.

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Why location matters

California is divided into sixteen climate zones. The zone a project falls in determines the insulation, glazing and equipment performance a report has to demonstrate, so two identical houses in different parts of the state can need different specifications to comply. A city can span more than one zone, which is why the zone is confirmed per project address rather than assumed from the city name.

Local building departments also differ in how they want compliance documents submitted, and some jurisdictions add their own reach-code requirements on top of the state standards.

Regional guides

Eight regional guides organise the county and city pages below. Each county belongs to exactly one of them, so a project has one obvious guide, and each guide explains how its zones change what a report has to show, which local rules apply and how it overlaps its neighbours. The regional boundaries are our own grouping, not official ones; the county pages and the climate zone guide remain the place to confirm a specific address.

The city lists under Cities by region keep an older, finer grouping. There, Los Angeles Area, Orange County and San Diego County are separate groups that together make up the Southern California guide, and a few cities, such as Oxnard and Fairfield, sit in a different group from their guide.

Title 24 in Southern California 5 counties
Title 24 in Northern California 23 counties
Title 24 in the Bay Area 5 counties
Title 24 in the Inland Empire 2 counties
Title 24 in the Central Valley 8 counties
Title 24 in the Central Coast 5 counties
Title 24 in Greater Sacramento 6 counties
Title 24 in the North Bay 4 counties

Cities by region

Los Angeles Area

Climate zones 6, 8, 9, 14 and 16

Orange County

Climate zones 6 and 8

San Diego County

Climate zones 7 and 10

Inland Empire & Desert

Climate zones 10, 14, 15 and 16

Bay Area

Climate zones 3, 4 and 12

Sacramento Region

Climate zones 11 and 12

Central Valley

Climate zones 12 and 13

Central Coast

Climate zones 3, 5, 6 and 9

North Bay & North State

Climate zones 2 and 11

Counties

Browse all California counties we cover — county-by-county permit notes and the climate zones each one spans.

Climate zones

Find the California climate zone that applies to your project — all sixteen zones, and what each one changes about a report.