Los Angeles County enforces 2025 CBC, T24 Pt 2 based on 2024 IBC with 3 local amendments on top. The amendments are the part that gets sets corrected. The state edition is only the floor.
Current edition
2025 Title 24
Prior edition
2022 Title 24
Code authority
LA County Dept. of Public Works: Building & Safety
Edition changeover: Projects with a complete application on or before 2025-12-31 may still be reviewed under the 2022 Title 24.
Adopted code and local amendments by discipline
Adopted code editions and local amendments by discipline
Discipline
Adopted code
Local amendment
Building
2025 CBC, T24 Pt 2 based on 2024 IBC
LA County Building Code: County Code Title 26
Residential
2025 CRC, T24 Pt 2.5 based on 2024 IRC
n/a
Existing buildings
2025 CEBC, T24 Pt 10 based on 2024 IEBC
n/a
Fire
2025 CFC, T24 Pt 9 based on 2024 IFC
LA County Fire Code: County Code Title 32
Electrical
2025 CEC, T24 Pt 3 based on 2023 NEC
n/a
Mechanical
2025 CMC, T24 Pt 4 based on 2024 UMC
n/a
Plumbing
2025 CPC, T24 Pt 5 based on 2024 UPC
n/a
Energy
2025 Energy Code, T24 Pt 6
n/a
Green / sustainability
2025 CALGreen, T24 Pt 11
n/a
Accessibility
2025 CBC Ch 11A/11B, T24 Pt 2
n/a
Wildland-urban interface
2025 CA-WUIC, T24 Pt 7 based on 2024 IWUIC
n/a
Historical buildings
2025 CHBC, T24 Pt 8
n/a
Administrative
2025 CAC, T24 Pt 1
n/a
Zoning
No state-adopted code
LA County Zoning Code: County Code Title 22Local text supersedes the state code
Unincorporated communities Los Angeles County reviews
These communities have no city building department of their own. The county is the authority having jurisdiction, so this page's code stack is the one that applies.
Altadena · East Los Angeles · Marina del Rey · Topanga · Agoura · Old Agoura · La Crescenta-Montrose · Hacienda Heights · Rowland Heights · Stevenson Ranch · Castaic · Val Verde · Quartz Hill · Willowbrook · Ladera Heights · View Park-Windsor Hills · West Athens · Westmont · Florence-Graham · Walnut Park · East Rancho Dominguez · Lennox · Del Aire · Alondra Park · West Whittier-Los Nietos · South Whittier · West Puente Valley · Avocado Heights · Charter Oak · Citrus · East San Gabriel · South San Gabriel · Whittier Narrows · Universal City · Kagel Canyon · Lake Los Angeles · Littlerock · Sun Village · Acton · Agua Dulce · Leona Valley · Green Valley · Lake Hughes · Elizabeth Lake · Juniper Hills · Pearblossom · Llano · Valyermo · Antelope Acres · Del Sur · Neenach · Gorman · Three Points · West Rancho Dominguez · Rancho Dominguez · East Compton · Athens · Firestone Park · Bandini Islands · City Terrace · East Pasadena · San Pasqual · Kinneloa Mesa · Sierra Madre Villa
What Los Angeles County actually amended
Quoted from the adopted ordinance. These are the provisions that differ from the state code, which is where most correction lists come from. Excerpts, not the whole ordinance. Follow the source link for the full text.
707.18.8 · 707.18.8
UL 3703-2015
Solar Trackers (with revisions through April 7, 2020)
Electrical
Table 802.2.1
UL 3730-2014
Photovoltaic Junction Boxes (with revisions through
June 11, 2021)
Electrical
Table 802.2.1
HOA.103795022.3
79
UL 3741-2020
Photovoltaic Hazard Control
Electrical
Table 802.2.1
UL 4703-2014
Photovoltaic Wire (with revisions through August 11,
2020)
Electrical
Table 802.2.1
UL 6703-2014
Connectors for Use in Photovoltaic Systems (with
revisions through June 10, 2021)
Electrical
Table 802.2.1
UL 7103-2019
Outline of Investigation for Building-Integrated
Photovoltaic Roof Coverings
Electrical
Table 802.2.1
UL 8703-2011
Outline of Investigation for Concentrator Photovoltaic
Mod- ules and… […]
3114.8.5.3 · 3114.8.5.3
Climatic,
Geologic
The greater Los Angeles/Long Beach region is situated
over a vast array of earthquake fault systems capable
of producing major earthquakes, including, but not
limited to, the recent 1994 Northridge Earthquake. The
region is further impacted by construction of buildings
and structures utilizing traditional construction materials
that impact the amount of energy, air quality,
greenhouse gas emission and construction waste in the
area. […]
SECTION J103 · SECTION J103
PERMITS REQUIRED
J103.1
Permits required.
Except as exempted in Section J103.2, grading shall not be performed without
first having obtained a permit therefor from the bBuilding oOfficial. A grading permit
does not include the construction of retaining walls or other structures. A separate
permit shall be obtained for each site and may cover both excavations and fills. Any
engineered grading as described in Section J104.2.3 shall be performed by a contractor
licensed by the State of California to perform the work described hereon. […]
SECTION J105 · SECTION J105
INSPECTIONS
J105.1
General.
Grading Iinspections shall be governed by Section 110, Chapter 1, Division II of
this code108 and as indicated herein. Grading operations for which a permit is required
shall be subject to inspection by the Building Official. In addition, professional
inspection of grading operations shall be performed by the Field Engineer, the
Geotechnical Engineer, and the Engineering Geologist retained to provide such
services in accordance with this Section for engineered grading and as required by the
Building Official for regular grading.
J105.2
Special and supplemental inspections. […]
SECTION J104 · SECTION J104
PERMIT APPLICATION AND SUBMITTALS
J104.1
Submittal requirements.
In addition to the provisions of Section 105.3 and 1.8.4, as applicable106.4, the
applicant shall state the estimated quantities of excavation and fillfollowing:
1.
The estimated quantities of excavation, fill, borrow, removal, or
combination thereof.
2.
The proposed land use for the site on which the grading is to be
performed.
HOA.103781425.2
89
J104.2
Site plan requirements. […]
SECTION J110 · SECTION J110
SLOPE PLANTING AND EROSION CONTROL
HOA.103781425.2
115
J110.1
General.
The faces of cut and fill slopes shall be prepared and maintained to control
erosion. This control shall be permitted to consist of effective planting, erosion control
blankets, soil stabilizers, or other means as approved by the Building Official.
Exception: Erosion control measures need not be provided on cut slopes not
subject to erosion due to the erosion-resistant character of the materials, as approved
by the Project Consultants to the satisfaction of the Building Official.
. . .
J110.3
Planting. […]
SECTION J107 · SECTION J107
FILLS
HOA.103781425.2
104
J107.1
General.
Unless otherwise recommended in the geotechnical report, fills shall comply with
the provisions of this sSection.
Exception: The Building Official may permit a deviation from the provisions of this
Appendix for minor fills not intended to support structures, where no geotechnical report
has been prepared.
J107.2
Surface Preparation.
Fill slopes shall not be constructed on natural slopes steeper than 2 units
horizontal to 1 unit vertical (50 percent slope). […]
SECTION J109 · SECTION J109
DRAINAGE AND TERRACING
J109.1
General.
Unless otherwise recommended by a registered design professionallicensed Civil
Engineer and approved by the Building Official, drainage facilities and terracing shall be
provided in accordance with the requirements of this sSection J109.2 for all cut and fill
slopes 3 units horizontal to 1 unit vertical (33-percent slope) and steeper.
HOA.103781425.2
111
EXCEPTION: Drainage facilities and terracing need not be provided where the
ground slope is not steeper than one unit vertical in three units horizontal (33-percent
slope). […]
SECTION 28. · SECTION 28
Appendix S is hereby added to read as follows:
APPENDIX S
SOLAR THERMAL ENERGY SYSTEMS
S 1.0
General.
In addition to the requirements of this Appendix, the provisions of this Code and
Title 29 – Mechanical Code – of the Los Angeles County Code shall apply to the
erection, installation, alteration, relocation, replacement, addition to, use, maintenance
and repair of solar thermal energy systems, including, but not limited to, equipment and
appliances intended to utilize solar thermal energy for water heating and swimming pool
heating.
S 2.0
Definitions.
For the purpose of this Appendix, certain terms, words, phrases, and their
derivatives shall be construed as set forth in this Section. […]
SECTION 58. · SECTION 58
Section J102.1 is hereby amended to read as follows:
J102.1
Definitions.
The following words and terms shall, for the purposes of this appendix, have the
meanings shown herein. Refer to Chapter 2 of this code for general definitionsFor the
purposes of this Appendix, the terms, phrases, and words listed in this Section and their
derivatives shall have the indicated meanings.
APPROVAL. When the proposed work or completed work conforms to this
Appendix, as determined by and to the satisfaction of the Building Official.
AS-BUILT. See Section J105.12.
BEDROCK. […]
Mapped hazard and district overlays stack on top of the adopted code. These are the overlays recorded for Los Angeles County. They apply by parcel, not jurisdiction-wide, so confirm the parcel before assuming one is in play. Check CAL FIRE's fire hazard severity viewer and FEMA's flood map service.
Very High Fire Hazard Severity Zone
Hillside / slope overlay
Methane hazard zone
Liquefaction hazard zone
California Coastal Zone
FEMA mapped flood hazard area
State law that overrides local zoning here
When one of these applies, the state statute governs over a conflicting local standard. This is the most common reason a local rule someone quotes you turns out not to be enforceable against a project.
Gov. Code 66310 et seq.
State ADU law preempts local zoning that would preclude a conforming ADU/JADU.
Applies when: project includes an ADU or JADU
Gov. Code 65915
State Density Bonus Law concessions/waivers override local development standards.
Applies when: project requests a density bonus
Gov. Code 65852.21 / 66411.7
SB 9 urban lot split / two-unit ministerial approval preempts conflicting local standards.
Applies when: project is an SB 9 lot split or two-unit development
Los Angeles County enforces 2025 CBC, T24 Pt 2 based on 2024 IBC, the edition adopted statewide in California, amended locally in 3 disciplines.
Does Los Angeles County amend the California code?
Yes: building, fire, zoning.
Where do I confirm the code edition for a Los Angeles County permit?
With the county building department that will review the permit. Adoption ordinances are amended on a local schedule, and a set submitted days apart can fall under different editions during a changeover.
Knowing the adopted edition is the easy half. Architechtura reads your drawings, resolves which of these provisions actually apply to the project, and returns the corrections a plan checker would write up, each one cited to the section it came from.
Compiled from published state and municipal adoption ordinances. Local governments amend their codes on their own schedule, and a pending ordinance can change what applies to your permit. Confirm the governing edition with the building department before you submit. This page is reference information, not a code determination.