What Building Codes Apply in California in 2026?
For building permit applications submitted on or after January 1, 2026, California uses the 2025 California Building Standards Code, California Code of Regulations, Title 24. The 2025 edition was published in 2025 but became the statewide code for new permit applications in 2026.
If a building permit application was received on or before December 31, 2025, the 2022 California Building Standards Code generally remains applicable to that application. The local enforcing agency determines the permit application date and handles project-specific code questions.
California Building Code vs. California Building Standards Code
These names are often used as if they mean the same thing, but technically they are different.
| Term | What it means | Where it is found |
|---|---|---|
| California Building Code (CBC) | The code covering building construction, occupancy, structural, accessibility, fire-life-safety and related requirements for applicable buildings. | Title 24, Part 2, Volumes 1 and 2 |
| California Building Standards Code | The complete collection of California building standards, including building, residential, electrical, mechanical, plumbing, energy, fire, green building and other codes. | California Code of Regulations, Title 24 |
So, if a contractor says a project must meet “Title 24,” the project may involve much more than the California Building Code alone. Electrical, plumbing, energy, fire, accessibility and green-building standards can all apply at the same time.
2026 California Title 24: All Adopted Code Parts
The 2025 edition of Title 24 is the code set used for qualifying 2026 permit applications. Several parts are based on national model codes with California amendments, while others are California-specific standards.
| Part | California code | 2025 edition basis / purpose |
|---|---|---|
| Part 1 | California Administrative Code | Administrative provisions used by California building-standards agencies. |
| Part 2 | California Building Code | Based on the 2024 International Building Code, with California amendments. |
| Part 2.5 | California Residential Code | Based on the 2024 International Residential Code, with California amendments. |
| Part 3 | California Electrical Code | Based on the 2023 National Electrical Code. |
| Part 4 | California Mechanical Code | Based on the 2024 Uniform Mechanical Code. |
| Part 5 | California Plumbing Code | Based on the 2024 Uniform Plumbing Code. |
| Part 6 | California Energy Code | California energy-efficiency requirements for residential and nonresidential buildings. |
| Part 7 | California Wildland-Urban Interface Code | Based on the 2024 International Wildland-Urban Interface Code, with California provisions. |
| Part 8 | California Historical Building Code | Alternative provisions addressing qualified historical buildings and structures. |
| Part 9 | California Fire Code | Based on the 2024 International Fire Code, with California amendments. |
| Part 10 | California Existing Building Code | Based on the 2024 International Existing Building Code. |
| Part 11 | California Green Building Standards Code (CALGreen) | California green-building requirements for applicable construction. |
| Part 12 | California Referenced Standards Code | Referenced technical standards used with other Title 24 provisions. |
How to Determine Which California Code Applies to Your Project
Applications submitted on or after January 1, 2026 are subject to the 2025 California Building Standards Code. Applications received on or before December 31, 2025 generally remain under the 2022 code cycle.
Determine whether the property is inside an incorporated city or in an unincorporated county area. The responsible city or county building department usually administers permits and local amendments.
A new house can involve the Residential, Electrical, Mechanical, Plumbing, Energy, Fire and CALGreen codes. A commercial project generally relies heavily on the Building Code plus applicable trade and specialty codes.
Do not stop at the statewide code. California cities and counties can adopt qualifying local amendments, so requirements may differ between jurisdictions.
Planning, zoning, grading, fire, public works, flood-zone, coastal, wildfire, historic-resource or utility requirements can affect a project even when they are not contained entirely within the basic building code.
California Cities and Counties Can Have Local Code Amendments
The statewide California Building Standards Code is the starting point, not always the final rule for a particular address. Local governments may adopt amendments when permitted by California law and must follow applicable findings and filing requirements.
- The current statewide Title 24 edition.
- The city or county’s adopted building-code ordinance and amendments.
- Project-specific zoning, fire, planning, engineering and other agency requirements.
The California Building Standards Commission maintains an official database of filed local amendments. Use the 2025 local ordinances directory and search by city or county name.
For practical examples of how the statewide 2025 codes are applied with local rules, see these USBuilding.org guides:
Which California Code Covers Common Construction Projects?
| Project or work | Codes commonly involved | What to verify locally |
|---|---|---|
| New single-family home | Residential, Electrical, Mechanical, Plumbing, Energy, CALGreen, Fire and applicable WUI provisions | Zoning, setbacks, grading, fire access, utilities and local amendments |
| Home addition or remodel | Residential or Building Code plus trade, Energy and CALGreen requirements as applicable | Structural scope, energy documentation, existing conditions and permit exemptions |
| Commercial building | Building, Electrical, Mechanical, Plumbing, Energy, CALGreen, Fire and accessibility provisions | Occupancy, construction type, egress, accessibility, fire systems and planning approvals |
| Tenant improvement | Building, Existing Building, accessibility and affected trade codes | Change of occupancy/use, accessibility upgrades and fire/life-safety impacts |
| Electrical panel or wiring | California Electrical Code | Utility requirements, service size and local permit procedures |
| HVAC replacement | Mechanical Code and Energy Code | Equipment efficiency, sizing, duct requirements and energy forms |
| Plumbing or water heater | California Plumbing Code plus applicable energy requirements | Seismic restraints, venting, combustion air and local permit rules |
| Existing building alteration | Existing Building Code plus applicable provisions of other Title 24 parts | Scope, structural impact, accessibility and existing nonconforming conditions |
A permit exemption from one code does not automatically exempt a project from zoning, electrical, plumbing, fire, grading or other laws. Always evaluate the complete scope of work.
2026 California Energy Code and CALGreen Requirements
The 2025 California Energy Code, Title 24 Part 6, applies to qualifying building permit applications submitted on or after January 1, 2026. It covers energy performance for residential and nonresidential construction, additions and applicable alterations.
The California Energy Commission identifies major themes in the 2025 update including expanded use of efficient heat-pump technology in new residential construction, electric-readiness, ventilation improvements and updated energy-efficiency requirements.
For energy-code forms, compliance manuals, reference appendices and approved tools, use the California Energy Commission’s 2025 Building Energy Efficiency Standards page.
CALGreen, Title 24 Part 11, works alongside the Energy Code and other building standards. Applicable provisions can address items such as resource efficiency, water, construction waste, indoor environmental quality and other green-building requirements.
Wildfire and Wildland-Urban Interface Requirements in 2026
California’s 2025 Title 24 includes a dedicated Part 7, California Wildland-Urban Interface Code. This is especially important for projects in locations exposed to wildfire hazards.
Do not determine wildfire construction requirements only from the city name or ZIP code. The exact parcel, designated hazard area, local fire authority, building type and project scope can change the requirements.
Who Enforces the California Building Code?
California does not use one single statewide permit office for ordinary construction. In most communities, the local city or county building department reviews plans, issues permits and performs inspections.
State agencies also have authority over specific occupancies or construction types. Depending on the project, agencies such as the California Department of Housing and Community Development, Division of the State Architect, Department of Health Care Access and Information, State Fire Marshal or other agencies may have a role.
Practical permit workflow
- Confirm whether the property is in a city or unincorporated county area.
- Find the responsible building department.
- Check the permit-application date and applicable code cycle.
- Review the local code-adoption ordinance.
- Check zoning and planning requirements before completing construction drawings.
- Prepare structural, architectural and trade documents required for the project.
- Complete required Title 24 energy and CALGreen documentation.
- Submit the permit application through the local agency’s portal or approved process.
- Respond to plan-check corrections and obtain permit issuance.
- Schedule required inspections before covering regulated work.
Official California Building Code Resources
| Official resource | Use it for |
|---|---|
| California Building Standards Commission — Codes | Official access links for the current Title 24 parts, errata and code publishers. |
| 2025 Title 24 Code Changes | State summaries of important California amendments and changes in the 2025 edition. |
| 2025 Local Ordinances | Find city and county amendments filed with the California Building Standards Commission. |
| 2025 California Energy Code | Energy standards, compliance materials, reference appendices and supporting documents. |
| California HCD Approved Building Standards | Housing-related building standards and code-adoption-cycle information. |
How to use the official code library
- Open the California Building Standards Commission Codes page.
- Select the 2025 Triennial Edition of Title 24.
- Choose the required code part, such as Part 2 for the Building Code or Part 2.5 for the Residential Code.
- Open the current published version and check any listed errata.
- Return to the CBSC local ordinances page and search the city or county where the property is located.
- Confirm the final project requirements with the responsible building department before submitting plans or beginning regulated work.
California Building Code 2026 FAQs
1. What California Building Code is in effect in 2026?
The 2025 California Building Standards Code, Title 24, is the current statewide code cycle for building permit applications submitted on or after January 1, 2026.
2. Why is the 2025 California Building Code called the current code in 2026?
California names the code by its publication edition. The 2025 edition was published in 2025 and became effective statewide on January 1, 2026.
3. Does the 2025 code apply to permits submitted in 2025?
Generally no. The California Building Standards Commission states that applications received on or before December 31, 2025 remain subject to the 2022 code cycle, while applications submitted on or after January 1, 2026 are subject to the 2025 code. Confirm the application date with the enforcing agency.
4. Is the California Building Code the same as Title 24?
Not exactly. The California Building Code is Part 2 of Title 24. Title 24 is the complete California Building Standards Code and also includes residential, electrical, mechanical, plumbing, energy, fire, existing-building, CALGreen and other standards.
5. What model code is the 2025 California Building Code based on?
Part 2 of the 2025 California Building Code is based on the 2024 International Building Code, with California amendments and agency-specific adoption provisions.
6. Can California cities have stricter building requirements?
Local jurisdictions may adopt qualifying amendments under California law. Always check the applicable city or county ordinance in addition to the statewide Title 24 code.
7. Where can I read the California Building Code online?
Start with the California Building Standards Commission’s official Codes page. It provides links to the publishers and available online versions of the Title 24 parts.
8. Does the California Energy Code apply in 2026?
Yes. The 2025 California Energy Code, Title 24 Part 6, applies to qualifying permit applications submitted on or after January 1, 2026.
9. Does California have a Wildland-Urban Interface Code in 2026?
Yes. The 2025 Title 24 includes Part 7, the California Wildland-Urban Interface Code. Project-specific applicability depends on the property, hazard conditions, jurisdiction and scope of work.
10. Who should I contact if I am unsure which code applies?
Contact the building department or enforcing agency responsible for the property’s jurisdiction. Provide the property address, project description and permit-application history so staff can identify the applicable code cycle and local amendments.
Before You Start a California Construction Project
For a new 2026 permit application, begin with the 2025 California Building Standards Code, then check the local city or county amendments and project-specific planning, fire, energy and other requirements. The safest sequence is to confirm the jurisdiction first, identify the applicable Title 24 parts, prepare the required documents and use the local building department only for the final project-specific determination and permit action.
Information updated for the 2026 California code cycle. USBuilding.org is an independent informational resource and is not a California government agency. Building officials and other authorized agencies make final code interpretations and permit decisions.