Title 24 Reports in Los Angeles

Los Angeles is one of the few California cities large enough to cross several climate zones, which means two projects inside the same city can face different energy requirements. A report has to be prepared for the zone the site actually falls in.

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Why Los Angeles is not one climate zone

The California Energy Commission assigns a climate zone by ZIP code, and the City of Los Angeles covers 4 of them — zones 6, 8, 9 and 16. The coast and the harbour sit in zone 6, South Los Angeles in zone 8, and the central city in zone 9 — which, perhaps surprisingly, includes the whole San Fernando Valley. Sunland-Tujunga, up against the San Gabriel foothills, is zone 16. That difference is not cosmetic: it changes the insulation, glazing performance and equipment efficiency a design has to hit before it complies.

It is also why a report prepared for one Los Angeles address cannot be reused at another. The Energy Commission notes that where a single ZIP contains more than one climate region, the local jurisdiction may designate one zone for that whole ZIP, so we confirm the zone against the project address rather than the city name.

Los Angeles climate zones by area

These are the zones the Energy Commission's ZIP-code table gives for the main parts of the city. Neighbourhood names are only a guide, because the ZIP decides; check any ZIP with the climate zone lookup, and we confirm it from the project address when you order.

  • Zone 6, the coast and the harbour: Pacific Palisades (90272), Brentwood (90049), West Los Angeles (90025), Venice (90291), Mar Vista (90066), Playa del Rey (90293), Westchester (90045), San Pedro (90731, 90732) and Wilmington (90744).
  • Zone 8, South Los Angeles: South Los Angeles (90001, 90003, 90011, 90037, 90044, 90047).
  • Zone 9, downtown, the central city and the whole San Fernando Valley: Downtown (90012, 90013, 90014, 90015, 90017, 90071), Hollywood (90028, 90038, 90046, 90068), Silver Lake and Echo Park (90026, 90039), Koreatown and Mid-Wilshire (90005, 90006, 90010, 90020, 90036), Westwood (90024), Eagle Rock and Highland Park (90041, 90042, 90065), Van Nuys and Sherman Oaks (91401, 91403, 91405, 91406, 91411, 91423), Studio City and North Hollywood (91601, 91602, 91604, 91605, 91606), Encino and Tarzana (91316, 91356, 91436), Woodland Hills and Canoga Park (91303, 91304, 91364, 91367), Northridge, Reseda and Chatsworth (91311, 91324, 91325, 91335) and Granada Hills, Sylmar and Pacoima (91331, 91342, 91344).
  • Zone 16, the foothills: Sunland-Tujunga (91040, 91042).

The line between zone 6 and zone 9 runs through the Westside: Brentwood and West Los Angeles are zone 6, while Westwood next door is zone 9, so two neighbouring projects can be modelled against different targets.

Permitting through LADBS

Most work in the city is permitted through the Los Angeles Department of Building and Safety, and the energy documents are reviewed as part of plan check alongside the architectural set. A correction notice referencing Title 24 usually means the compliance forms do not match what the drawings show — a window schedule that changed after the calculations were run is the common cause.

Work that typically triggers a report

Los Angeles has a high volume of accessory dwelling units, garage conversions and single-storey additions, and all three normally require compliance documentation because they add conditioned floor area or alter the building envelope. Replacing windows, re-roofing with a change in assembly, or installing new heating, cooling or water-heating equipment can trigger it on their own, without any addition at all.

Commercial and tenant-improvement work in the city follows the nonresidential forms, where lighting and mechanical scope usually determine how much documentation is required.

Common Title 24 Questions in Los Angeles

  1. Do I need a Title 24 report for a project in Los Angeles?
  2. How much does a Title 24 report cost in Los Angeles?
  3. How long does a Los Angeles Title 24 report take?
  4. What plans does LADBS need with a Title 24 report?
  5. Do Los Angeles ADUs need Title 24?
  6. Does a Los Angeles garage conversion need Title 24?
  7. Do home additions in Los Angeles require Title 24?
  8. Do Los Angeles commercial tenant improvements require Title 24?
  9. Which climate zone applies to my Los Angeles project?
  10. What happens if LADBS plan check requests Title 24 corrections?

Los Angeles projects fall in California climate zones 6, 8, 9 and 16. 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.

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Title 24 in Los Angeles County

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