Title 24 Reports in Santa Ana
Santa Ana is climate zone 8 throughout, while Costa Mesa and Fountain Valley on its western side are zone 6. Most work here is alteration to older housing rather than new build.
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Zone 8, with zone 6 on the western edge
All of Santa Ana carries zone 8. Costa Mesa and Fountain Valley, immediately west, carry zone 6; Tustin and Garden Grove carry zone 8 like Santa Ana. The line between the coastal and inland zones runs down the western side of the city.
What makes Santa Ana projects different from its neighbours'
Not the zone but the building stock. Santa Ana is the Orange County seat and one of the densest cities in California, with a large share of housing built well before the energy code existed and a great deal of small multi-family — duplexes, fourplexes and older apartment courts — mixed into single-family blocks.
That changes which standards apply, and it is a distinction worth getting right. A duplex is Group R-3 and documented under the single-family standards. Three units or more crosses into the multifamily standards and a different form family entirely. On a street with both, two projects that look alike take different routes.
Alterations rather than new construction
With little vacant land, the common Santa Ana project is an addition, a garage conversion, an ADU or a remodel of an older house — which means the existing construction usually has to be established or assumed from the vintage of the building. Where it can be established, the design is assessed on real conditions rather than on conservative defaults. Permits are issued by the city rather than by Orange County.
Common Title 24 Questions in Santa Ana
- Which climate zone applies to a Santa Ana project?
- Why is Santa Ana a different zone from Costa Mesa?
- Does a duplex in Santa Ana use single-family standards?
- Does a Santa Ana garage conversion need an energy report?
- Does the city or Orange County issue my permit?
Santa Ana projects fall in California climate zone 8. The zone drives the envelope and equipment requirements a report has to meet, and a single city can span more than one, so it is confirmed per address.