Orange County combines coastal and inland communities with steady ADU, single-family, and multifamily activity across more than 30 incorporated cities.
Title 24 Reports in Orange County
Much of Orange County is built out, so a large share of Title 24 work here involves existing homes: ADUs added to established lots, garage conversions, room and second-story additions, and window or HVAC replacements. Newer master-planned communities add new single-family and multifamily construction. Each city reviews permits through its own building department, but the energy code, compliance software and forms are the same across the county.
Orange County Climate Zones
Orange County sits between the ocean and the foothills of the Santa Ana Mountains. Coastal neighborhoods stay mild, while inland areas are warmer in summer, which gives cooling equipment, west-facing glass and attic insulation more influence on the model.
- Coastal — Huntington Beach, Costa Mesa and Newport Beach are in Climate Zone 6.
- Central — Santa Ana and Irvine fall in Zones 6 and 8 depending on address.
- North and inland — Anaheim, Fullerton, Buena Park and Tustin are in Climate Zone 8.
Zone lines do not follow city limits exactly, so the report always uses the zone for your project address and ZIP code. The climate zone map shows the full picture.
Common Orange County Projects
- ADUs and JADUs in tract neighborhoods — see Anaheim ADU Title 24 for a city example
- Garage conversions, which bring previously unconditioned space into the energy model — see the garage conversion service
- Additions and second stories on existing homes — see the home addition service
- Window replacements in older coastal and inland homes — see the window replacement service
We also serve Garden Grove, Orange and South County communities such as Mission Viejo and San Clemente. For the wider region, see Southern California Title 24.
Frequently Asked Questions
Is the Title 24 report different in each Orange County city?
The report format is the same statewide. What changes is the climate zone for the address and any local amendments the city has adopted on top of the state code.
Does an Orange County ADU need its own report?
Yes, in most cases. A new ADU or garage conversion is modeled on its own CF1R. See ADU Title 24 reports.
