CBC · California Building Code
Scope and application of Chapter 3 (Use and Occupancy)
Chapter 3 tells you how to assign every building or space to an occupancy group (the starting point for all other CBC rules). It requires that multipurpose spaces meet all applicable uses, mixed‑occupancy buildings follow Section 508, and unlisted uses be placed in the occupancy they most nearly resemble; § 301.1 declares the chapter controls classification, and § 302.1 explains the classification principles.
Last reviewed: July 5, 2026
What the code requires — 2-4 sentences
Chapter 3 of the California Building Code sets the rules that determine how every building, structure or portion thereof is formally classified by use and occupancy. The chapter’s provisions control occupancy classification because different occupancy groups carry different levels of hazard and risk, and those classifications drive the rest of the Code’s requirements (§ 301.1).
Requirements in detail
Basic rule: chapter control and purpose
- The provisions of Chapter 3 “shall control the classification of all buildings and structures as to occupancy and use.” That is the primary organizing rule: use-group assignment is the starting point for applying height/area limits, fire‑protection requirements, means of egress, and many other technical provisions (§ 301.1).
What “classification” means in practice
- Occupancy classification is the formal designation of the primary purpose of a building, structure or portion thereof. Structures are placed into one or more occupancy groups based on the nature of hazards and risks generally associated with the intended use (§ 302.1).
- When a space is intended for different uses at different times, it must comply with all requirements applicable to those potential uses (§ 302.1).
Decision dimensions you use when assigning occupancy
Below is a compact decision table showing the key decision dimensions and where to look in the Code.
| Decision dimension | Values / examples | Why it matters | Code reference |
|---|---|---|---|
| Primary purpose of space | Assembly, Business, Educational, Factory, High‑hazard, Institutional, Mercantile, Residential, Storage, Utility, etc. | Determines occupancy group and applicable chapters/limits | § 302.1 — occupancy list and group mapping |
| Multipurpose / time‑shared use | Same space used for different activities at different times | Must meet requirements for all potential uses | § 302.1 — multipurpose compliance |
| Mixed occupancies (multiple groups in one structure) | Any building with more than one occupancy group | Triggers mixed‑occupancy rules and separations / design options | § 302.1 — reference to Section 508 for multi-occupancy compliance |
| Uses not listed | New or unusual uses not explicitly described | Classify in the occupancy it most nearly resembles by hazard/fire safety | § 302.1 — unlisted uses to nearest occupancy |
| Occupiable roofs | Roofs intended for occupancy | Classified in the occupancy group that the roof most nearly resembles | § 302.1 — occupiable roofs; see also § 503.1.4 reference |
How the chapter interacts with the rest of the CBC
- Chapter 3 is the gatekeeper: after you assign an occupancy group using Chapter 3, you apply the technical requirements elsewhere in the CBC (for example, height/area in Chapters 5/6, fire protection in Chapters 7–9, means of egress in Chapter 10, accessibility in Chapter 11, etc.). The occupancy assignment therefore determines which chapters and tables apply (§ 301.1).
Exceptions & special cases
- Multipurpose spaces: a room used differently at different times must comply with all requirements for those uses; you cannot choose a single easier classification to avoid obligations (§ 302.1).
- Unlisted or novel uses: if the proposed purpose is not explicitly listed in Chapter 3, the Code directs classification into the occupancy “it most nearly resembles” based on fire safety and relative hazard (§ 302.1).
- Occupiable roofs are treated by classification to the occupancy they most closely match and must comply with the referenced roof‑occupancy provision (§ 302.1; see reference to § 503.1.4).
- Mixed‑occupancy buildings must follow the mixed‑occupancy provisions (Chapter 3 cross‑references Section 508 for multi‑occupancy rules) (§ 302.1).
If you need the detailed text of the mixed‑occupancy rules in Section 508 or the occupiable‑roof rules in § 503.1.4, those sections are referenced by Chapter 3; they are not reproduced here. (I can retrieve and cite those sections on request.)
Common mistakes
- Treating occupant function as secondary: designers sometimes skip occupancy classification and try to apply generic requirements — but Chapter 3 classification is the legal starting point and must be done first (§ 301.1).
- Misclassifying multipurpose rooms as a single use: if a space will host multiple activities, it must satisfy all applicable requirements for those uses (§ 302.1).
- Ignoring mixed‑occupancy procedures: putting different occupancies in one building without applying Section 508 can produce noncompliance because separation, fire‑resistance, and occupant‑load rules depend on correct treatment (§ 302.1).
- Assuming “closest fit” is permissive: classifying an unlisted use to the “nearest” occupancy is based on hazard and fire safety — not convenience — and must be justified in the project documentation (§ 302.1).
Worked example — mixed restaurant + apartments (concrete scenario)
Scenario:
- Ground floor: 1,200 sq ft restaurant with fixed seating for about 75 patrons.
- Floors 2–3: three apartments per floor (six apartments total), combined residential area 6,000 sq ft.
How to apply Chapter 3:
Identify primary uses for each portion:
- Ground floor use = Assembly/Restaurant (Group A‑2 as described in Chapter 3 group headings).
- Upper floors = Residential (Group R, commonly R‑2 or R‑3 depending on specifics). These assignments follow the occupancy grouping approach in Chapter 3 (§ 302.1).
Recognize a mixed‑occupancy building:
- Because the structure contains more than one occupancy group, it is a mixed‑occupancy building and must comply with the mixed‑occupancy rules (the Code directs application of Section 508 for buildings with multiple groups) (§ 302.1).
Next steps (what Chapter 3 requires you to do, not detailed technical numbers):
- Apply Section 508 (mixed‑occupancy methods): determine required separations or treat the building under the most restrictive occupancy requirements, or use the allowable area calculations that combine occupancies (text of § 508 provides methods). Chapter 3 tells you to turn to Section 508 for the applicable approach (§ 302.1).
Notes: this example uses sizes and counts for illustration. The determination of exact code features to install (fire separation wall ratings, sprinkler requirements, number of exits, etc.) depends on applying Section 508 and the technical chapters triggered by the occupancy groups; those specifics must be computed using the applicable sections and tables elsewhere in the CBC.
Related provisions
- § 301 — Scope of Chapter 3 (chapter control over occupancy classification)
- § 301.1 — General statement that Chapter 3 controls occupancy classification and recognizes varying hazard levels
- § 302.1 — Occupancy classification definition and requirements for multi‑use, mixed occupancies, unlisted uses, and occupiable roofs (cross‑references Section 508 and § 503.1.4)
- Section 508 — Mixed occupancies (Chapter 3 directs you to apply Section 508 when multiple groups are present; retrieve § 508 text for the specific methods)
- § 503.1.4 — Occupiable roofs referenced by § 302.1 (see Chapter 5/related provisions for rooftop classifications)
Code references
Grounded in the retrieved California Building Code — click a citation to read the verbatim passage:
CBC § 1-33 High relevance — show source text
112 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
113 Means of Appeals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
114 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
115 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
202 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
CHAPTER 3 OCCUPANCY CLASSIFICATION AND USE . . . . .3-1
301 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
302 Occupancy Classification and Use Designation . . . . 3-3
303 Assembly Group A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
304 Business Group B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
305 Educational Group E . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
306 Factory Group F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
307 High-Hazard Group H . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
308 Institutional Group I . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
309 Mercantile Group M. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
310 Residential Group R. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
311 Storage Group S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
312 Utility and Miscellaneous Group U . . . . . . . . . . . . . . 3-18
313 Laboratories Group L [SFM]. . . . . . . . . . . . . . . . . . . . . . .3-19
CBC § 310.2 High relevance — show source text
1|||X|||||||||||||||||||||| |310.2|||X|X||||||||||||||||||||| |310.3|||X|X||||||||||||||||||||| |310.3.1|||X|||||||||||||||||||||| |310.3.2|||X|||||||||||||||||||||| |310.4|||X|X||||||||||||||||||||| |310.4.1|||X|||||||||||||||||||||| |310.4.2|||X|X|X|||||||||||||||||||| |310.5|||X|||||||||||||||||||||| |310.6|||X|||||||||||||||||||||| |313|||X|||||||||||||||||||||| |314|||X||||||||||||||||||||||
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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OCCUPANCY CLASSIFICATION AND USE
User notes:
About this chapter: Chapter 3 provides the criteria by which buildings and structures are classified into use groups and occupancies. Through the balance of the code, occupancy classification is fundamental in the setting of features of construction; occupant safety requirements, especially building limitations; means of egress; fire protection systems; and interior finishes.
ICC code development note: Code change proposals to sections preceded by the designation [F] will be considered by the IFC code development committee meeting during the 2024 (Group A) Code Development Cycle. All other code change proposals will be considered by a code development committee meeting during the 2025 (Group B) Code Development Cycle.
SECTION 301—SCOPE
301.1 General. The provisions of this chapter shall control the classification of all buildings and structures as to occupancy and use. Different classifications of occupancy and use represent varying levels of hazard and risk to building occupants and adjacent properties.
SECTION 302—OCCUPANCY CLASSIFICATION AND USE DESIGNATION
302.1 Occupancy classification. Occupancy classification is the formal designation of the primary purpose of the building, structure or portion thereof. Structures shall be classified into one or more of the occupancy groups specified in this section based on the nature of the hazards and risks to building occupants generally associated with the intended purpose of the building or structure. An area, room or space that is intended to be occupied at different times for different purposes shall comply with all applicable requirements associated with such potential multipurpose. Structures containing multiple occupancy groups shall comply with Section 508. Where a structure is proposed for a purpose that is not specified in this section, such structure shall be classified in the occupancy it most nearly resembles based on the fire safety and relative hazard. Occupiable roofs shall be classified in the group that the occupancy most nearly resembles, according to the fire safety and relative hazard, and shall comply with Section 503.1.4.
- Assembly (see Section 303): Groups A-1, A-2, A-3, A-4 and A-5.
- Business (see Section 304): Group B.
CBC § 1.11. High relevance — show source text
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
2025 CALIFORNIA EXISTING BUILDING CODE 3A-1
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3A-2 2025 CALIFORNIA EXISTING BUILDING CODE
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3 A PROVISIONS FOR ALL COMPLIANCE METHODS
User notes:
About this chapter: Chapter 3A controls the compliance options for alteration, repair, addition, evaluation and change of occupancy of existing structures regulated by the Department of Health Care Access and Information/Office of Statewide Hospital Planning and Development, which include hospitals and correctional treatment centers [applications listed in Section 1.10.1 (OSHPD 1)].
SECTION 301 A —ADMINISTRATION
301 A .1 Applicability. The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing structures for applications listed in Sections 1.10.1 [OSHPD 1] regulated by the Department of Health Care Access and Information/Office of Statewide Hospital Planning and Development (OSHPD).
California Energy Commission, State Fire Marshal and DSA-AC requirements for existing structures shall be enforced by the Department of Health Care Access and Information/Office of Statewide Hospital Planning and Development (OSHPD).
301 A .1.1 Bleachers, grandstands and folding and telescopic seating. Existing bleachers, grandstands and folding and telescopic seating shall comply with ICC 300.
301 A .2 Repairs. Repairs shall comply with the requirements of Chapter 4 A .
301 A .3 Alteration, addition or change of occupancy. The alteration, addition or change of occupancy of all existing buildings or structures shall comply with one of the methods or categories listed in Section 301 A .3.1, 301 A .3.2 or 301 A .3.3. Section 304A.3.2 applies to all methods or categories. Sections 301 A .3.1 through 301 A .3.3 shall not be applied in combination with each other , except when permitted by the enforcement agency.
Exception: Subject to the approval of the enforcement agency, alterations complying with the laws in existence at the time the building or the affected portion of the building was built shall be considered in compliance with the provisions of this code. New structural members added as part of the alteration shall comply with the California Building Code .
301 A .3.1 Prescriptive compliance method. Alterations, additions and changes of occupancy complying with Chapter 5 A of this code for existing buildings or structures shall be considered in compliance with the provisions of this code.
CBC § 3.14 High relevance — show source text
Title 19, Division 1]||||X|||||||||||||||||||| |Chapter / Section|||||||||||||||||||||||| |301|||X||||||||||||||||||||| |[T-19 §3.14]||||X|||||||||||||||||||| |[T-19 §3.19 (a-g)]||||X|||||||||||||||||||| |302|||X||||||||||||||||||||| |304|||X||||||||||||||||||||| |[T-19 §3.07(a)]||||X|||||||||||||||||||| |[T-19 §3.07(b)]||||X|||||||||||||||||||| |[T-19 §3.19 (b)(c)]||||X|||||||||||||||||||| |308.1.1|||X||||||||||||||||||||| |[T-19 §3.25 (a)(b)]||||X|||||||||||||||||||| |308.5|||X||||||||||||||||||||| |310.2|||X||||||||||||||||||||| |[T-19 §3.32 (a)(b)]||||X|||||||||||||||||||| |[T-19 §3.32 (d)]||||X|||||||||||||||||||| |310.3|||X||||||||||||||||||||| |[T-19 §3.32 (c)]||||X|||||||||||||||||||| |312 - 316|||X||||||||||||||||||||| |[T-19 §3.05 (b)]||||X|||||||||||||||||||| |317|||X||||||||||||||||||||| |319 - 322|||X||||||||||||||||||||| |323|||X|||||||||||||||||||||- The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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PART II— GENERAL SAFETY PROVISIONS
3 GENERAL REQUIREMENTS
User notes:
About this chapter: Chapter 3 provides general requirements for asphalt kettles, combustible waste material, ignition sources, motion picture projection rooms and film, open burning, recreational fires, portable outdoor fireplaces, open flames, powered industrial trucks and equipment, smoking, vacant premises, vehicle impact protection, fueled equipment, indoor displays, general storage, outdoor pallet storage, hazards to firefighters, landscaped roofs, laundry carts, mobile food preparation vehicles, additive manufacturing (3D printing) and artificial combustible vegetation. These are intended to improve premises safety for everyone, including construction workers, tenants, operations and maintenance personnel, and emergency response personnel.
SECTION 301—GENERAL
301.1 Scope. The provisions of this chapter shall govern the occupancy and maintenance of all structures and premises for precautions against fire and the spread of fire and general requirements of fire safety.
CBC § 309.2.1 High relevance — show source text
2||||X|X|||||||||||||||||||| |309.2.1|||X|||||||||||||||||||||| |310 – 311|||||||||||X|X|||X|||||||||| |312|||||||||||X|||||||||||||| |313 – 316|||X|||||||||||||||||||||| |317 – 322|X|||||||X|X|||||||||||||||| |323||||||||X|X||||||||||||||||
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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3 PROVISIONS FOR ALL COMPLIANCE METHODS
User notes:
About this chapter: Chapter 3 explains the three compliance options for alterations and additions available in the code. In addition, this chapter also lays out the methods to be used for seismic design and evaluation throughout this code. Finally, this chapter clarifies that provisions in other I-Codes related to repairs, alterations, additions, relocation and changes of occupancy must also be addressed unless they conflict with this code. In that case, this code takes precedence.
SECTION 301—ADMINISTRATION
301.1 Applicability. The repair, alteration, change of occupancy, addition or relocation of all existing buildings shall comply with Section 301.2, 301.3 or 301.4. The provisions of Sections 302 through 309 shall apply to all alterations, repairs, additions, relocation of structures and changes of occupancy regardless of compliance method. [OSHPD 1R, 2, 4 and 5] Section 301.4 not permitted by OSHPD.
Exceptions: 1. Existing state-owned structures. [BSC] The repair, alteration, change of occupancy, addition or relocation of all existing buildings shall comply with the provisions of Sections 317 through 322 as the minimum standards for earthquake evaluation and design for retrofit of existing state-owned structures, including buildings owned by the University of California, the California State University or the Judicial Council. The provisions of Sections 317 through 322 may be adopted by a local jurisdiction for earthquake evaluation and design for retrofit of existing buildings. 2. Public school buildings [DSA-SS] The provisions of Sections 317 through 323 establish minimum standards for earthquake evaluation and design for the rehabilitation of existing buildings for use as public school buildings under the jurisdiction of the Division of the State Architect—Structural Safety (DSA-SS, refer to Section 1.9.2.1) where required by Sections 4-307 and 4-309(c) of the California Administrative Code. The provisions of Sections 317 through 323 also establish minimum standards for earthquake evaluation and design for rehabilitation of existing public school buildings currently under the jurisdiction of DSA-SS. 3. _**Community college buildings.
CBC § 1.5.2 High relevance — show source text
1.5.2_||||X|||||||||||||||||||| |R109.1.5.3||||X|||||||||||||||||||| |R109.1.6|||X|X|||||||||||||||||||| |R109.1.6.1||||X|||||||||||||||||||| |R109.1.6.2||||X|||||||||||||||||||| |R109.2 - R109.4|||X||||||||||||||||||||| |R110 - R110.4|||X||||||||||||||||||||| |R111 - R111.3|||X||||||||||||||||||||| |R113.1 - R113.2|||X||||||||||||||||||||| |R114.1 - R114.4|||X|||||||||||||||||||||
The state agency does not adopt sections identified with the following symbol: †
1-2 2025 CALIFORNIA RESIDENTIAL CODE
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PART I—ADMINISTRATIVE
1 ADMINISTRATION
DIVISION I CALIFORNIA ADMINISTRATION
SECTION 1.1—GENERAL
1.1.1 Title. These regulations shall be known as the California Residential Code, may be cited as such and will be referred to herein as “this code.” The California Residential Code is Part 2.5 of thirteen parts of the official compilation and publication of the adoption, amendment and repeal of building regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 International Residential Code of the International Code Council with necessary California amendments.
1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation and energy conservation; safety to life and property from fire and other hazards attributed to the built environment; and to provide safety to fire fighters and emergency responders during emergency operations.
1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replacement, repair, equip- ment, use and occupancy, location, maintenance, removal and demolition of every detached one- and two-family dwelling and townhouse not more than three stories above grade plane in height with a separate means of egress and structures accessory thereto throughout the State of California.
Exceptions: 1. Live/work units complying with the requirements of Section 508.5 of the California Building Code shall be permitted to be constructed as one- and two-family dwellings or townhouses in accordance with this code, as applicable. Fire suppression required by Section 508.5.7 of the California Building Code when constructed under the California Residential Code for one- and two-family dwellings shall conform to Section 903.3.1.3 of the California Building Code. 2. Owner-occupied lodging houses with five or fewer guestrooms shall be permitted to be constructed in accordance with the California Residential Code for one- and two-family dwellings when equipped with a fire sprinkler system in accordance with Section R309.
1.1.3.1 Classification. Structures or portions of structures shall be classified with respect to occupancy in one or more of the groups _listed in Chapter 3 of the California Building Code.
CBC § 301.1 Medium relevance — show source text
ICC code development note: Code change proposals to sections preceded by the designation [F] will be considered by the IFC code development committee meeting during the 2024 (Group A) Code Development Cycle. All other code change proposals will be considered by a code development committee meeting during the 2025 (Group B) Code Development Cycle.
SECTION 301—SCOPE
301.1 General. The provisions of this chapter shall control the classification of all buildings and structures as to occupancy and use. Different classifications of occupancy and use represent varying levels of hazard and risk to building occupants and adjacent properties.
SECTION 302—OCCUPANCY CLASSIFICATION AND USE DESIGNATION
302.1 Occupancy classification. Occupancy classification is the formal designation of the primary purpose of the building, structure or portion thereof. Structures shall be classified into one or more of the occupancy groups specified in this section based on the nature of the hazards and risks to building occupants generally associated with the intended purpose of the building or structure. An area, room or space that is intended to be occupied at different times for different purposes shall comply with all applicable requirements associated with such potential multipurpose. Structures containing multiple occupancy groups shall comply with Section 508. Where a structure is proposed for a purpose that is not specified in this section, such structure shall be classified in the occupancy it most nearly resembles based on the fire safety and relative hazard. Occupiable roofs shall be classified in the group that the occupancy most nearly resembles, according to the fire safety and relative hazard, and shall comply with Section 503.1.4.
- Assembly (see Section 303): Groups A-1, A-2, A-3, A-4 and A-5.
- Business (see Section 304): Group B. 3. [SFM] Organized Camps (see Section 450): Group C. 4. Educational (see Section 305): Group E. 5. Factory and Industrial (see Section 306): Groups F-1 and F-2. 6. High Hazard (see Section 307): Groups H-1, H-2, H-3, H-4 and H-5. 7. Institutional (see Section 308): Groups I-2, I-3 and I-4. 8. [SFM] Laboratory (see Section 202): Group B, unless classified as Group L (see Section 453) or Group H (see Section 307). 9. [SFM] Laboratory Suites (see Section 453): Group L. 10. Mercantile (see Section 309): Group M. 11 . Residential (see Section 310): Groups R-1, R-2, R-2.1, R-3, R-3.1 and R-4. 12 . Storage (see Section 311): Groups S-1 and S-2. 13 . Utility and Miscellaneous (see Section 312): Group U. 14. [SFM] Existing buildings housing existing protective social care homes or facilities established prior to 1972 (see California Fire Code Chapter 11 and California Existing Building Code).
302.1.1 Reserved
302.1.2 Reserved
302.1.3 Pharmacies; veterinary facilities; barbering, cosmetology or electrolysis establishments; and acupuncture offices. See Chapter 12.
CBC § 1-24 Medium relevance — show source text
102 Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Part 2—Administration and Enforcement . . . . . . . . . . . . . . . . . 1-24
103 Code Compliance Agency . . . . . . . . . . . . . . . . . . . . . . 1-24
104 Duties and Powers of Building Official. . . . . . . . . . . 1-25
105 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
106 Floor and Roof Design Loads . . . . . . . . . . . . . . . . . . . 1-29
107 Construction Documents . . . . . . . . . . . . . . . . . . . . . . 1-29
108 Temporary Structures, Equipment and Systems . . . . . . . . . . . . . . . . . . . . . 1-31
109 Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
110 Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
111 Certificate of Occupancy. . . . . . . . . . . . . . . . . . . . . . . 1-33
112 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
113 Means of Appeals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
114 Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
115 Stop Work Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
CHAPTER 2 DEFINITIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
201 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
202 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
CHAPTER 3 OCCUPANCY CLASSIFICATION AND USE . . . . .3-1
301 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
302 Occupancy Classification and Use Designation . . . . 3-3
CBC § 8-3 Medium relevance — show source text
TREATMENT. An act of work to carry out preservation, restoration, stabilization, rehabilitation or reconstruction.
4 2025 CALIFORNIA HISTORICAL BUILDING CODE
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8-3 USE AND OCCUPANCY
SECTION 8-301 — PURPOSE AND SCOPE
8-301.1 Purpose. The purpose of the CHBC is to provide regulations for the determination of occupancy classifications and conditions of use for qualified historical buildings or properties.
8-301.2 Scope. Every qualified historical building or property for which a permit or approval has been requested shall be classified prior to permit issuance according to its use or the character of its occupancy in accordance with the regular code and applicable provisions of this chapter.
SECTION 8-302 — GENERAL
8-302.1 Existing use. The use or character of occupancy of a qualified historical building or property, or portion thereof, shall be permitted to continue in use regardless of any period of time in which it may have remained unoccupied or in other uses, provided such building or property otherwise conforms to all applicable requirements of the CHBC.
8-302.2 Change in occupancy. The use or character of the occupancy of a qualified historical building or property may be changed from or returned to its historical use or character, provided the qualified historical building or property conforms to the requirements applicable to the new use or character of occupancy as set forth in the CHBC. Such change in occupancy shall not mandate conformance with new construction requirements as set forth in regular code.
8-302.3 Occupancy separations. Required occupancy separations of more than one hour may be reduced to one-hour fire-resistive construction with all openings protected by not less than three-fourths-hour fire-resistive assemblies of the self-closing or automatic-closing type when the building is provided with an automatic sprinkler system throughout the entire building in accordance with Section 8-410.2. Doors equipped with automatic-closing devices shall be of a type which will function upon activation of a device which responds to products of combustion other than heat.
Required occupancy separations of one hour may be omitted when the building is provided with an automatic sprinkler system throughout.
8-302.4 Maximum floor area. Regardless of the use or character of occupancy, the area of a one-story qualified historical building or property may have, but shall not exceed, a floor area of 15,000 square feet (1393.5 m [2] ) unless such an increase is otherwise permitted in regular code. Multistory qualified historical buildings (including basements and cellars) shall be in accordance with regular code requirements.
Exception: Historical buildings may be unlimited in floor area without fire-resistive area separation walls:
- When provided with an automatic sprinkler, or
- Residential occupancies of two stories or less when provided with a complete fire alarm and annunciation system and where the exiting system conforms to regular code.
8-302.5 Maximum height. The maximum height and number of stories of a qualified historical building or property shall not be limited because of construction type, provided such height or number of stories does not exceed that of its historical design.
CBC § 3.8 Medium relevance — show source text
3.8||||X|X|||||X|X|X|X|X|X|X||||||||| |110.3.10 – 110.3.11|||X|X|X|||||X|X|X|X|X|X|X||||||||| |110.3.12 – 110.3.12.1||||X|X|||||||||||||||||||| |110.3.12.2||||X|X|||||||||||||||||||| |110.4 – 110.6|||X|||||||X|X|X|X|X|X|X||||||||| |111 – 112|||X|||||||X|X|X|X|X|X|X||||||||| |113||||||||||X|X|X|X|X|X|X||||||||| |114.1 – 114.2|||X|||||||X|X|X|X|X|X|X||||||||| |114.3||||||||||X|X|X|X|X|X|X||||||||| |115 – 116|||X|||||||X|X|X|X|X|X|X|||||||||
The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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1 ADMINISTRATION
DIVISION I CALIFORNIA ADMINISTRATION
SECTION 1.1—GENERAL
1.1.1 Title. These regulations shall be known as the California Building Code, may be cited as such and will be referred to herein as “this code.” The California Building Code is Part 2 of thirteen parts of the official compilation and publication of the adoption, amendment and repeal of building regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 International Building Code of the International Code Council with necessary Califor- nia amendments.
1.1.2 Purpose. The purpose of this code is to establish the minimum requirements to safeguard the public health, safety and general welfare through structural strength, means of egress facilities, stability, access to persons with disabilities, sanitation, adequate lighting and ventilation and energy conservation; safety to life and property from fire and other hazards attributed to the built environment; and to provide safety to firefighters and emergency responders during emergency operations.
1.1.3 Scope. The provisions of this code shall apply to the construction, alteration, movement, enlargement, replacement, repair, equip- ment, use and occupancy, location, maintenance, removal and demolition of every building or structure or any appurtenances connected or attached to such buildings or structures throughout the State of California.
1.1.3.1 Nonstate-regulated buildings, structures and applications. Except as modified by local ordinance pursuant to Section 1.1.8, the following standards in the California Code of Regulations, Title 24, Parts 2, 2.5, 3, 4, 5, 6, 7, 9, 10 and 11 shall apply to all occupancies and applications not regulated by a state agency.
CBC § 1.10.1 Medium relevance — show source text
CHAPTER TOPICS Col2 CHAPTER SUBJECTS 1, 2 Administrative Requirements and Definitions 3 Provisions for all Compliance Methods 4 Repairs 5 Prescriptive Compliance Method for Existing Buildings 6–11 Work Area Compliance Method for Existing Buildings 13 Performance Compliance Method for Existing Buildings 14 Relocated Buildings 15 Construction Safeguards 16 Referenced Standards Appendix A Guidelines for Seismic Retrofit of Existing Buildings Appendix B Supplementary Accessibility Requirements for Existing Buildings Appendix C Guidelines for Wind Retrofit of Existing Buildings Appendix D Board of Appeals Appendix E Temporary Emergency Uses Resource A Guidelines on Fire Ratings of Archaic Materials and Assemblies CALIFORNIA BUILDING CODE CORRELATED TOPICS
The CEBC requirements for construction safeguards are directly correlated to the requirements of the CBC. The following table shows chapters of the CBC that are correlated with the CEBC:
CEBC/CBC CORRELATED TOPICS Col2 Col3 CEBC CHAPTER/SECTION CBC CHAPTER/SECTION SUBJECT Chapter 15 Chapter 33 Construction safeguards Chapter 1 Scope and Administration.
Chapter 1 establishes the limits of applicability of the code and describes how the code is to be applied and enforced. The provisions of Chapter 1 establish the authority and duties of the code official appointed by the authority having jurisdiction and also establish the rights and privileges of the design professional, contractor and property owner.
Chapter 2 Definitions.
Chapter 2 is the repository of the definitions of terms used in the body of the code. The user of the code should be familiar with and consult this chapter because the definitions are essential to the correct interpretation of the code and because the user may not be aware that a term is defined.
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Chapter 3 Provisions for All Compliance Methods.
Chapter 3 guides the use of the three compliance methods of the CEBC and provides requirements that apply globally. The globally applicable requirement include general requirements related to buildings materials and other applicable codes, storm shelters, structural loads, in-situ load tests, accessibility, smoke alarms, carbon monoxide detection and exterior wall coverings.
Chapter 3A Provisions for All Compliance Methods.
Chapter 3A controls the compliance options for alteration, repair, addition, evaluation and change of occupancy of existing structures regulated by the Department of Health Care Access and Information/Office of Statewide Hospital Planning and Development, which include hospitals and correctional treatment centers (applications listed in Sections 1.10.1 (OSHPD 1).
Chapter 4 Repairs.
Chapter 4, a chapter independent of the three compliance methods, governs the repair of existing buildings. The provisions define conditions under which repairs may be made using materials and methods like those of the original construction or the extent to which repairs must comply with requirements for new buildings.
Chapter 4A Repairs.
Chapter 4A governs the repair of existing buildings regulated by the Department of Health Care Access and Information/Office of State- wide Hospital Planning and Development, which include hospitals and correctional treatment centers (applications listed in Sections 1.10.1 (OSHPD 1).
CBC § 1.10.4.3 Medium relevance — show source text
1.10.4.3 Identification of amendments. For applications listed in Section 1.10.4, amendments appear in this code preceded with the acronym [OSHPD 4], unless the entire chapter is applicable.
1.10.4.4 Reference to other chapters. Where reference is made within this code to sections in Chapters 16, 17, 18, 19, 21 and 22, the respective sections in Chapters 16A, 17A, 18A, 19A, 21A and 22A shall apply instead.
Authority— Health and Safety Code Sections 127010, 127015 and 129790.
References— Health and Safety Code Sections 127010, 127015, 1275 and 129675 through 130070.
1.10.5 OSHPD 5. Specific scope of application of the agency responsible for enforcement, enforcement agency and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.
Application— Acute psychiatric hospital buildings.
Enforcing agency— Health Care Access and Information/Office of Statewide Hospital Planning and Development (OSHPD). The office shall also enforce the California Energy Commission—Energy Regulations, the Division of the State Architect—Access Compliance regulations and the regulations of the Office of the State Fire Marshal for the above-stated facility type.
1.10.5.1 Applicable administrative standards. 1. Title 24, Part 1, California Code of Regulations: Chapter 7. 2. Title 24, Part 2, California Code of Regulations: Sections 1.1 and 1.10, Chapter 1, Division I, and as adopted in Chapter I, Division II.
1.10.5.2 Applicable building standards. California Building Standards Code, Title 24, Parts 2, 3, 4, 5, 6, 9, 10 and 11.
The provision of Title 24, Part 2, as adopted and amended by OSHPD, shall apply to the applications listed in Section 1.10.5.
OSHPD 5 adopts the following building standards in Title 24, Part 2:
Chapters 2 through 10, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 30, 31, 32, 33 and 35.
1.10.5.3 Identification of amendments. For applications listed in Section 1.10.5, amendments appear in this code preceded with the acronym [OSHPD 5].
Authority— Health and Safety Code Sections 127010, 127015, 1275 and 129850.
References— Health and Safety Code Sections 127010, 127015, 129680, 1275 and 129675 through 130070.
1.10.6 OSHPD 6. Specific scope of application of the agency responsible for enforcement, enforcement agency and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.
Application —Chemical dependency recovery hospital not within an acute care hospital building or an acute psychiatric facility.
Enforcing agency —Local building department.
Frequently asked questions
Who decides the occupancy classification for an unusual new use not listed in Chapter 3?
The project’s design professional proposes a classification based on the occupancy the use most nearly resembles by hazard and fire safety; the enforcing authority (building official) reviews and accepts or requires a different classification (§ 302.1).
If a community room is used as a daycare three days a week and a meeting room two days a week, which rules apply?
You must comply with all applicable requirements for each intended use — Chapter 3 requires multipurpose spaces to meet requirements for all potential uses (§ 302.1).
Does Chapter 3 decide technical details like sprinkler spacing and fire ratings?
Not directly — Chapter 3 assigns the occupancy group(s). Those group designations then determine which technical chapters and tables (fire protection, means of egress, construction type, etc.) apply. The Chapter 3 assignment is the required first step (§ 301.1).
If a roof will host temporary events, how is it classified?
Chapter 3 requires occupiable roofs to be classified in the occupancy group they most closely resemble and points to the roof provisions (see § 302.1 and reference to § 503.1.4) for specific requirements.
More in California Building Code
- Administration & Permits
- Energy Efficiency
- Existing Buildings
- Occupancy Classification & Use
- Hazardous Materials & Occupancies
- Types of Construction
- Fire-Resistance & Fire Safety
- Interior Finishes
- Means of Egress
- Accessibility
- Exterior Walls
- Roofing & Roof Assemblies
- Structural Design
- Special Inspections & Tests
- Foundations & Soils
- Concrete
- Masonry
- Steel
- Wood
- Elevators & Conveying Systems
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