New homes in Climate Zone 12 must meet the full Title 24 energy standards, including the statewide solar PV requirement that applies to most new low-rise residential construction.
What new construction must address
- Full building envelope and air sealing
- High-efficiency HVAC and water heating
- Lighting controls
- Solar photovoltaic (PV) system for most new low-rise homes
Title 24 is a statewide California energy code. Climate Zone 12 does not have its own separate rules — the same statewide standards apply, with the energy budget calibrated to this zone's climate. Your project's exact requirements are determined when your specific address is modeled in CEC-approved compliance software. The required PV size and the compliant design path are calculated from your address and plans.
Related: residential Title 24 service.
More Climate Zone 12 guides: solar & battery requirements · heat pump requirements · insulation requirements · Title 24 requirements.
The same topic in neighbouring zones: Climate Zone 11 and Climate Zone 13. Statewide: new construction Title 24 reports.