Los Angeles County is California’s largest and most diverse construction market, spanning dense urban infill, hillside homes, ADUs, and low-rise multifamily development.
Title 24 Across Los Angeles County
Almost every permitted ADU, new home, addition and many alterations in the county need a Title 24 energy report, whether the project is in the City of Los Angeles or one of the county's many smaller cities. Each city runs its own building department, but the energy code and compliance forms are the same statewide. For most homes and ADUs the report is a CF1R; small apartment buildings use a multifamily report.
Coastal Basin vs Inland Valleys
The county's climate changes quickly as you move away from the ocean, and that changes the energy model. Communities near the coast see mild summers, while the San Fernando and San Gabriel valleys get noticeably hotter, so cooling, window orientation and attic insulation carry more weight there.
- Coastal — Santa Monica is in Climate Zone 6, while Long Beach and Torrance fall in Zones 6 and 8 depending on address.
- Inland valleys — much of Los Angeles, along with Pasadena, Glendale and Burbank, is in Climate Zone 9.
Zone boundaries do not follow city limits exactly — the project address and ZIP code set the zone used in the report. See Climate Zone 8 or the full climate zone map.
Common Projects in Los Angeles County
- ADUs and garage conversions on single-family lots — see Los Angeles ADU Title 24
- Hillside homes and additions, where large view windows and orientation shape the result
- Small multifamily infill such as duplexes and fourplexes
- HVAC changeouts to heat pumps in older homes — see the HVAC replacement service
We also prepare reports in cities such as Pomona and Downey, and for Ventura County projects such as nearby Oxnard, which sits in coastal Climate Zone 6. For the wider region, see Southern California Title 24.
Frequently Asked Questions
Which climate zone is my Los Angeles County project in?
Most of the county falls in Zone 6, 8 or 9, depending on distance from the coast, but the exact zone depends on your address. We confirm it when we prepare the report.
Do LA County cities have extra energy rules?
Some cities adopt local amendments on top of the state code. Tell us if your building department has given you a local checklist, and see Title 24 requirements for the statewide baseline.
