Mixed occupancies, incidental uses & change of occupancy

Grounded in the retrieved California Building Code — click a citation to read the verbatim passage:

• CBC § 1001.2.1 High relevance — show source text

  1001.2.1 Change of use. Any work undertaken in connection with a change in use shall conform to the applicable requirements for the work as classified in Chapter 6 and to the requirements of Sections 1002 through 1010.

  1001.2.2 Change of occupancy classification. Where a building undergoes a change of occupancy classification, the provisions of Sections 1002 through 1011 shall apply.

  1001.2.2.1 Partial change of occupancy. Where a portion of an existing building undergoes a change of occupancy classification, Section 1011 shall apply.

  1001.3 Certificate of occupancy required. A certificate of occupancy shall be issued where a change of occupancy occurs that results in a different occupancy classification as determined by the California Building Code .

  SECTION 1002—SPECIAL USE AND OCCUPANCY

  1002.1 Compliance with the building code. Where an existing building or part of an existing building undergoes a change of occupancy to one of the special use or occupancy categories as described in Chapter 4 in the California Building Code, the building shall comply with all of the requirements of Chapter 4 of the California Building Code applicable to the special use or occupancy.

  1002.2 Incidental uses. Where a portion of a building undergoes a change of occupancy to one of the incidental uses listed in Table 509.1 of the California Building Code, the incidental use shall comply with Section 509 of the California Building Code applicable to the incidental use.

  SECTION 1003—BUILDING ELEMENTS AND MATERIALS

  1003.1 General. Building elements and materials in portions of buildings undergoing a change of occupancy classification shall comply with Section 1011.

  SECTION 1004—FIRE PROTECTION

  1004.1 General. Fire protection requirements in Section 1011 shall apply where either of the following occur:

  1. A building or portion thereof undergoes a change of occupancy.
  2. A building or portion thereof undergoes a change of occupancy and there is a different fire protection system threshold requirement in Chapter 9 of the current California Building Code than exists in the current building or portion thereof.

  SECTION 1005—MEANS OF EGRESS

  1005.1 General. Means of egress in portions of buildings undergoing a change of occupancy classification shall comply with Section 1011.

  SECTION 1006—STRUCTURAL

  [BS] 1006.1 Live loads. Structural elements carrying tributary live loads from an area with a change of occupancy shall satisfy the requirements of Section 1607 of the California Building Code . Design live loads for areas of new occupancy shall be based on Section 1607 of the California Building Code . Design live loads for other areas shall be permitted to use previously approved design live loads.

  Exception: Structural elements whose demand-capacity ratio considering the change of occupancy is not more than 5 percent greater than the demand-capacity ratio based on previously approved live loads.

  2025 CALIFORNIA EXISTING BUILDING CODE 10-3

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  �

  CHANGE OF OCCUPANCY

  [BS] 1006.2 Snow and wind loads. Where a change of occupancy results in a structure being assigned to a higher risk category, the structure shall satisfy the requirements of Sections 1608 and 1609 of the California Building Code for the new risk category.

• CBC § 704.7 High relevance — show source text

  Ducts 704.7, 705.11, 706.11, 707.10, 708.9, 709.8, 710.8, 712.1.10.3, 712.1.6, 713.10, 714.1.1, 717 Encroachment, public right-of-way 3202.3.2 Equipment on roof 1511 Equipment platforms 505.3 Fireplaces 2111 Incidental use room Table 509.1

  Motion picture projection room 409.3 Permit required 105.1, 105.2 Roof access 1011.12 Seismic inspection and testing 1704.3.2, 1705.13.7 Smoke control system 909 Systems Chapter 28 Mechanically Laminated Decking 2304.9.3 Medical Care (see Institutional I-2) 407.1 Medical Gas Systems 427 Membrane Roof Coverings 1507.11, 1507.12, 1507.13 Membrane Structures 2702.2, 3102 Mercantile Occupancy (Group M) 309 Accessible Chapter 11B Alarm and detection 907.2.6.3.4

  Area 503, 505, 506, 507, 508 Covered and open mall buildings 402 Hazardous material display and storage 414.2.5 Height 503, 504, 505, 508 Incidental uses 509

  Interior finishes Table 803.13, 804 Live load Table 1607.1 Means of egress Aisles 1018.3, 1018.4 Stairway, exit access 1019 Travel distance 402.8, 1006.3, 1017.2, 1006.2.1 Mixed occupancies 508.3, 508.4 Accessory 508.2 Live/work units 508.5 Mall buildings 402 Parking below/above 510.2, 510.7, 510.8, 510.9 Special mixed 510.2 Occupancy exceptions 307.1.1 Plumbing fixtures Chapter 29 Sprinkler protection 903.2.7 Standpipes 905.3.3 Unlimited area 507.4, 507.5, 507.13 Merchandise Pad 1018.4

  Metal

  Aluminum Chapter 20 Roof coverings 1504.4.2, 1507.4, 1507.5

  Steel Chapter 22

  INDEX-14 2025 CALIFORNIA BUILDING CODE

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  INDEX

  Pedestrian

  Protection at construction site

  3303.2, 3306 Walkways and tunnels 3104, 3202.3.4 Penalties 114.4 Penetration-Firestop System Fire-rated horizontal assemblies

  714.5.2

  Fire-rated walls 714.4.2 Penetrations 714, 717 Fire-resistant assemblies

  Exterior wall 705.11

  Fire barrier 707.7, 707.10 Fire partition 708.7, 708.9 Fire wall 706.9, 706.11 Horizontal assemblies 714.5

  Installation 714.2

• CBC § 1001.1 High relevance — show source text

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  10 CHANGE OF OCCUPANCY

  User notes:

  About this chapter : The purpose of this chapter is to provide regulations for the circumstances where an existing building is subject to a change of occupancy or a change of occupancy classification. A change of occupancy is not to be confused with a change of occupancy classification. The California Building Code defines different occupancy classifications in Chapter 3 and special occupancy requirements in Chapter 4. Within specific occupancy classifications there can be many different types of actual activities that can take place. For instance, a Group A-3 occupancy classification deals with a wide variation of different types of activities, including bowling alleys and courtrooms, indoor tennis courts and dance halls. When a facility changes use from, for example, a bowling alley to a dance hall, the occupancy classification remains A-3, but the different uses could lead to drastically different code requirements. Therefore, this chapter deals with the special circumstances that are associated with a change in the use of a building within the same occupancy classification as well as a change of occupancy classification.

  SECTION 1001—GENERAL

  1001.1 Scope. The provisions of this chapter shalle a change of occupancy occurs, as defined in Section 202.

  1001.2 Certificate of occupancy. A change of occupancy or a change of occupancy within a space where there is a different fire protection system threshold requirement in Chapter 9 of th apply where current California Building Code than exists in the current building or space shall not be made to any structure without the approval of the code official. A certificate of occupancy shall be issued where it has been determined that the requirements for the change of occupancy have been met.

  1001.2.1 Change of use. Any work undertaken in connection with a change in use shall conform to the applicable requirements for the work as classified in Chapter 6 and to the requirements of Sections 1002 through 1010.

  1001.2.2 Change of occupancy classification. Where a building undergoes a change of occupancy classification, the provisions of Sections 1002 through 1011 shall apply.

  1001.2.2.1 Partial change of occupancy. Where a portion of an existing building undergoes a change of occupancy classification, Section 1011 shall apply.

  1001.3 Certificate of occupancy required. A certificate of occupancy shall be issued where a change of occupancy occurs that results in a different occupancy classification as determined by the California Building Code .

  SECTION 1002—SPECIAL USE AND OCCUPANCY

  1002.1 Compliance with the building code. Where an existing building or part of an existing building undergoes a change of occupancy to one of the special use or occupancy categories as described in Chapter 4 in the California Building Code, the building shall comply with all of the requirements of Chapter 4 of the California Building Code applicable to the special use or occupancy.

  1002.2 Incidental uses. Where a portion of a building undergoes a change of occupancy to one of the incidental uses listed in Table 509.1 of the California Building Code, the incidental use shall comply with Section 509 of the California Building Code applicable to the incidental use.

  SECTION 1003—BUILDING ELEMENTS AND MATERIALS

  1003.1 General. Building elements and materials in portions of buildings undergoing a change of occupancy classification shall comply with Section 1011.

  SECTION 1004—FIRE PROTECTION

• CBC § 101.4.7 High relevance — show source text

  Existing 101.4.7 Fire walls 706.1 Height (see Height, Building) 502.1, 503, 504, 505, 508, 510 Occupancy classification Chapter 3 Party walls 706.1.1 Relocatable 3113

  Replicable Appendix N Building, Existing 202 Building Department 103 Building Official Duties and powers 103, 104 Qualifications Appendix A Records 104.7

  Termination A101.4 Building-Integrated Photovoltaic (BIPV) (see Photovoltaic) Built-Up Roof 1507.10 Business Occupancy (Group B) 303.1.1, 303.1.2, 304 Alarms and detection 907.2.2 Ambulatory care facilities 304, 422 Area 503, 505, 506, 507, 508 Height 503, 504, 505, 508, 510 Higher education laboratories 428, 2702.2

  Incidental uses 509 Interior finishes Table 803.13, 804 Live load Table 1607.1 Means of egress Aisles 1018.3

  Stairway, exit access 1019 Travel distance 1006.3, 1017.2,

  1006.2.1

  Mixed occupancies 508.2, 508.3, 508.4 Accessory 303.1.2, 508.2 Ambulatory care facilities 422 Assembly 303.1.2

  Assembly spaces 1030 Exit signs 1013.1 Guards 1015.2, 1030.17 Main exit 1030.3

  Open air 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Panic hardware 1010.2.8, 1010.4.1 Smoke-protected 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Travel distance 1006.2.1, 1006.3, 1017.2, 1030.7 Mixed occupancies 508.3, 508.4 Accessory 508.2 Education 303.1.3

• CBC § 2202.2 High relevance — show source text

  Seismic provisions 2202.2, 2204.2, 2206.1.1, 2207.1.1, 2209.2, 2210.2 Special inspections 1705.3 Stainless Steel 1705.2.2, 2203, 2205 Stairs, ladders and guarding for steel storage racks and industrial steel work platforms 2213 Storage racks 2209, 2213 Structural steel 2202

  Stone Masonry 2103.1, 2113.11.2.1 Stone Veneer 1404.8 Slab-type 1404.9 Stop Work Orders 115 Storage Occupancy (Group S) 311 Accessibility Chapter 11B Accessory 311.1.1 Area 406.5.4, 406.5.5, 406.6.1, 503, 505, 506, 507, 508 Equipment platforms 505.2 Group provisions Hazard storage, low, Group S-2 311.3 Hazard storage, moderate, Group S-1 311.2 Hazardous material display and storage 414.2.5 Height 406.5.4, 406.6.1, 503, 504, 505, 508, 510 Incidental uses 509

  Interior finishes Table 803.13, 804 Live loads Table 1607.1 Means of egress Aisles 1018.5

  Stairway, exit access 1019 Travel distance 1006.3, 1017.2, 1017.2.2, 1006.2.1 Mixed occupancies 508.3, 508.4 Accessory 311.1.1, 508.2 Parking above/below 510.3, 510.4, 510.7, 510.8, 510.9 Special mixed 510.2

  Occupancy exception 311.1.1 Plumbing fixtures Chapter 29 Self-service storage 311.2 Special provisions Aircraft related occupancies 412 High-piled combustible 413 Parking garages 406, 510 Sprinkler protection 903.2.10 Unlimited area 507.3, 507.4, 507.5 Storage Racks, Steel 2209 Storm Shelter 423

  Education 423.5 Emergency operation facilities 423.4 Refuge area (see Refuge Area) Risk category 1604.5.1 Strength Design requirements 1604.2 Strength Design 1604.1 Factored load 202

  Limit state 202

  Load combinations 1605

  Load factor 202

  Masonry 2108 Structural Composite Lumber 2303.1.10, Table 2304.11 Structural Design Chapter 16, 107.2.7, Chapter 16A Aluminum Chapter 20 Concrete Chapters 19 and 19A Foundations Chapters 18 and 18A Masonry Chapters 21 and 21A Steel Chapters 22 and 22A Wood Chapter 23 Structural Glued-Laminated

  Timber 2303.1, Table 2306.1 Structural Observation 1704.6

  Stucco 2512

• CBC § 803.13 High relevance — show source text

  Incidental uses 509 Interior finishes Table 803.13, 804 Live load Table 1607.1 Means of egress Aisles 1018.3

  Stairway, exit access 1019 Travel distance 1006.3, 1017.2,

  1006.2.1

  Mixed occupancies 508.2, 508.3, 508.4 Accessory 303.1.2, 508.2 Ambulatory care facilities 422 Assembly 303.1.2

  Assembly spaces 1030 Exit signs 1013.1 Guards 1015.2, 1030.17 Main exit 1030.3

  Open air 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Panic hardware 1010.2.8, 1010.4.1 Smoke-protected 1005.3.1, 1005.3.2, 1006.3, 1009.6.4, 1019.3, 1027, 1030.6.2 Travel distance 1006.2.1, 1006.3, 1017.2, 1030.7 Mixed occupancies 508.3, 508.4 Accessory 508.2 Education 303.1.3

  Live/work units 508.5 Mall buildings 402 Other occupancies 303.1.1, 303.1.2, 303.1.3 Parking below/above 510.7, 510.9 Religious facilities 303.1.4 Special mixed 510.2 Motion picture theaters 409, 507.12 Occupancy exceptions 303.1.1, 303.1.2, 303.1.3, 303.1.4, 305.1.1, 305.2.1 Plumbing fixtures Chapter 29 Risk category Table 1604.5 Seating, fixed (see Seating, Fixed) Seating, open-air assembly seating 1030.6.3 Seating, smoke-protected 1030.6.2 Sprinkler protection 410, 504.3, 506.2, 507.12, 507.4, 507.6, 507.7, 903.2.1 Stages and platforms 410 Standpipes 905.3.2, 905.5.1 Unlimited area 507.12, 507.4, 507.4.1, 507.6, 507.7 Assisted Living (see Group I-1 and Group R-4) 308.2, 310.5, 420 Atmospheric Ice Loads 1614 Atrium 404

  Alarms and detection 404.4, 907.2.15 Enclosure 404.6, 707.3.6 Interior finish 404.8 Means of egress 404.9, 404.10, 404.11, 1006.3.2, 1017.3, 1019.3, 1023.2,

  1028.2

  Smoke control 404.5, 909 Sprinkler protection 404.3 Standby power 404.7 Travel distance 404.9, 1006.2.1, 1006.3, 1017.2

  Use 404.2

  Attic 202

• CBC § 105.6 High relevance — show source text

  INDEX

  Unlimited Area Buildings 507 Unsafe Structures and Equipment (see Structures, Unsafe) 116 Appeals 113, Appendix B Revocation of permit 105.6 Stop work orders 115 Utilities disconnection 112.3

  Unstable Materials 307.3, Table 414.2.5.1, Table 414.5.1, Table 415.6.5, 415.7.1, 415.9 Unusable Space 711.2.6 Use and Occupancy Chapter 3 Accessory 508.2 Classification 302.1

  Detailed requirements based on occupancy and use Chapter 4 Incidental uses 509, Table 509.1 Mixed 508.3, 508.4 Use designation 302.2 Utilities 112

  Service connection 112.1

  Service disconnection 112.3

  Temporary connection 112.2 Utility and Miscellaneous Occupancy (Group U) 312 Accessibility Chapters 11A and 11B Agricultural buildings Appendix C Area 503, 505, 506, 507, 508 Flood provisions Appendix G Height 503, 504, 508 Incidental uses 509

  Live loads Table 1607.1 Means of egress Exit signs 1013.1 Stairway, exit access 1019 Mixed occupancies 508.3, 508.4 Special provisions Private garages and carports 406.3 Residential aircraft hangars 412.4 Sprinkler protection 903.2.11 Travel distance 1006.2.1, 1006.3,

  1017.1 UV Germicidal Irradiation Systems

  1211

  Valuation or Value (see Fees, Permit) 109.3 Vapor Diffusion Port 202 Vapor Retarders 1202.3, 1404.3, 1404.3.2 Vegetative Artificial decorative 419, 419.1 Vegetative roofs 1505.10, 1507.15 Vehicle Barrier 1607.11 Vehicle Barrier Systems 406.4.2, 1607.11 Vehicle Show Rooms 304 Vehicular Fueling 406.7 Vehicular Gates 3110 Vehicular Repair 406.8

  Veneer Cement plaster 1404.16, 1411 Fastening 1404.5 Fiber-cement siding 1404.17, 1411 Glazing 1404.13, 1411 Masonry, adhered 1404.11, 2101.2.1, 2103.2.4 Masonry, anchored 1404.7, 1411, 2101.2.1

  Metal 1404.12

  Plastic 1411, 2605 Slab-type 1404.9, 1411

  Testing Automatic fire-extinguishing systems 904.4

  Automatic water mist systems 904.11.3 Building official required 104.2.3.6 Carbon dioxide systems 904.8 Clean agent system 904.10 Dry chemical systems 904.6 Emergency and standby power 2702.4 Fire alarm systems 907.7, 907.8 Fire pumps 913.5 Fire-resistant materials 703.2

• CBC § 508.5 High relevance — show source text

  Structures with multiple occupancies or uses shall comply with Section 508 of the California Building Code. Where a struc-_ ture is proposed for a purpose that is not specifically provided for in this code, such structure shall be classified in the group that the occupancy most nearly resembles, according to the fire safety and relative hazard involved in accordance with this code or the Cali- fornia Building Code.

  Note: Live/work units complying with the requirements of Section 508.5 of the California Building Code are classified as a Group R-2 occupancy and are permitted to be constructed as one- and two-family dwellings or townhouses in accordance with this code.

  1.1.3.1.1 Utility and Miscellaneous Group U. Buildings and structures of an accessory character and miscellaneous structures not classified in any specific occupancy shall be constructed, equipped and maintained to conform to the requirements of this code commensurate with the fire and life hazard incidental to their occupancy. Group U shall include, but not be limited to, the following:

  Agricultural buildings

  Aircraft hangars, accessory to a one- or two-family residence (see Section 412.5 of the California Building Code)

  Barns

  Carports

  Fences more than 7 feet (2134 mm) high

  Grain silos, accessory to a residential occupancy

  Greenhouses

  Livestock shelters

  Private garages

  Retaining walls

  Sheds

  2025 CALIFORNIA RESIDENTIAL CODE 1-3

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  DIVISION I CALIFORNIA ADMINISTRATION

  Stables

  Tanks

  Towers

  1.1.3.2 Regulated buildings, structures and applications. The model code, state amendments to the model code and/or state amendments where there are no relevant model code provisions shall apply to detached one- and two-family dwellings, lodging houses, live/work units, townhouses and structures accessory thereto. State agencies with regulatory authority as specified in Sections 1.2 through 1.14, except where modified by local ordinance pursuant to Section 1.1.8. When adopted by a state agency, the provisions of this code shall be enforced by the appropriate enforcing agency, but only to the extent of authority granted to such agency by the state legislature.

  Note: See “How to Distinguish Between Model Code Language and California Amendments” following the Preface. 1. One- and two-family dwellings, townhouses, employee housing, factory-built housing and other types of dwellings contain- ing sleeping accommodations with common toilets or cooking facilities. See Section 1.8.2.1.1. 2. Permanent buildings and permanent accessory buildings or structures constructed within mobilehome parks and special occupancy parks regulated by the Department of Housing and Community Development. See Section 1.8.2.1.3. 3. Applications regulated by the Office of the State Fire Marshal include, but are not limited to, the following in accordance with Section 1.11:

• CBC § 2103.4 High relevance — show source text

  Reinforcement

  Masonry 2103.4 Shotcrete 1908 Religious Worship, Places of Accessibility Chapter 11B Alarms and detection 907.2.1 Balcony 1030.5 Classification 303.1.4, 303.4, 305.1.1, 305.2.1, 308.5.2 Door operations 1010.2.9 Egress 1030 Interior finishes Table 803.13, 804 Unlimited area 507.6, 507.7 Relocating, Building 101.4.7, 107.2.8, 3113 Compliance 3113.1.1 Inspection agencies 3113.4 Manufacturer’s data plate 3113.3 Supplemental information 3113.2 Repairs, Building 101.4.7, 202 Flood 1612.1

  Minor 105.2.2

  Permit required 105.1 Roof, Reroofing 1509, 1512 Residential Hotels (mail receptacles) 420.13.1 Residential Occupancy (Group R) 310 Accessibility Chapter 11A, 11B Alarm and detection 907.2.8, 907.2.9, 907.2.11, 907.2.12, 907.5.2.3.2,

  907.5.2.3.3

  Area 503, 505, 506, 508, 510 Carbon monoxide alarms 915 Cooking 420.10, 420.11 Draftstopping 708.4.3, 718.4 Group provisions Group R-1 (transient) 310.2 Group R-2 (apartment) 310.3 Group R-3 (two dwellings per building) 310.4 Group R-4 (group homes) 310.5 Electric vehicle charging 420.14 Height 503, 504, 505, 508, 510 Incidental uses 509

  Interior finishes Table 803.13, 804 Live load Table 1607.1

  Live/work units 508.5 Means of egress Aisles 1018.5

  Corridors 1020.2, 1020.3

  Doors 1010.1.1 Emergency escape and rescue 1031.2

  Exit signs 1013.1, 1013.2 Single exits 1006.3 Stairway, exit access 1019 Travel distance 1006.3.3, 1017.2,

  1006.2.1

  Mixed occupancies 508.3, 508.4 Accessory 508.2, G112.1 Live/work units 508.5 Parking, private 406.2.8, 406.3 Parking below/above 510.4, 510.7, 510.9

  Special mixed 510.2

  INDEX-16 2025 CALIFORNIA BUILDING CODE

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  INDEX

  Means of egress 3310 Protection of pedestrians 3306 Sanitary facilities 3305 Site work 3304

• CBC § 508.5.8 Medium relevance — show source text

  508.5.8 Structural. Floors within a live/work unit shall be designed for the live loads in Table 1607.1, based on the function within the space.

  Exception: Residential areas of live/work units constructed in accordance with the California Residential Code shall not be required to comply with Table 1607.1.

  [BE] 508.5.9 Accessibility. Accessibility shall be designed in accordance with Chapter 11A and/or 11B, when applicable, for the function served.

  508.5.10 Ventilation. The applicable ventilation requirements of the California Mechanical Code shall apply to each area within the live/work unit for the function within that space.

  508.5.11 Plumbing facilities. The nonresidential area of the live/work unit shall be provided with minimum plumbing facilities as specified by the California Plumbing Code, based on the function of the nonresidential area. Where the nonresidential area of the live/work unit is required to be accessible, the plumbing fixtures specified by the California Plumbing Code shall be accessible.

  SECTION 509—INCIDENTAL USES

  509.1 General Incidental uses located within single occupancy or mixed occupancy buildings shall comply with the provisions of this section. Incidental uses are ancillary functions associated with a given occupancy that generally pose a greater level of risk to that occupancy and are limited to those uses specified in Table 509.1.

  Exception: Incidental uses within and serving a dwelling unit are not required to comply with this section.

  �

  [F] TABLE 509.1—INCIDENTAL USES	Col2
  ROOM OR AREA	SEPARATION AND/OR PROTECTION
  Furnace room where any piece of equipment is over 400,000 Btu per hour input	1 hour or provide automatic sprinkler system
  Rooms with boilers where the largest piece of equipment is over 15 psi and 10 horsepower	1 hour or provide automatic sprinkler system
  Refrigerant machinery room	1 hour or provide automatic sprinkler system
  Hydrogen fuel gas rooms, not classified as Group H	1 hour in Group B, F, M, S and U occupancies; 2 hours in Group A, E, I and R occupancies.
  Incinerator rooms	2 hours and provide automatic sprinkler system
  Paint shops, not classified as Group H, located in occupancies other than Group F	2 hours; or 1 hour and provide automatic sprinkler system
  In Group E occupancies, laboratories and vocational shops not classi- fied as Group H	1 hour or provide automatic sprinkler system
  [SFM]Rooms or areas with special hazards such as laboratories, voca- tional shops and other such areas not classified as Group H, located in Group E occupancies where hazardous materials in quantities not exceeding the maximum allowable quantity are used or stored.	1 hour
  In Group I-2 occupancies, laboratories not classified as Group H	1 hour_a_
  In ambulatory care facilities, laboratories not classified as Group H	1 hour or provide automatic sprinkler system
  Laundry rooms over 100 square feet	1 hour or provide automatic sprinkler system
  In Group I-2, laundry rooms over 100 square feet	1 hour and provide automatic sprinkler system_a_
  Group I-3 cells and Group I-2 patient rooms equipped with padded surfaces	1 hour and provide automatic sprinkler system_a_
  In Group I-2,

• CBC § 1.1 Medium relevance — show source text

  Exception: The building need not be made to comply with Chapter 16 A of the California Building Code unless required by Section 506 A .5.

  506 A .1.1 Change in function . A change in function shall require compliance with all the functional requirements for new construc- tion in the California Building Code, including requirements in California Building Code Section 1224. Compliance shall be only as necessary to meet the specific provisions and is not intended to require the entire building be brought into compliance.

  Exception: Minimum room clearances, areas and dimensions may meet the requirements of the 2001 California Building Code for existing rooms re-used for a similar purpose, subject to the approval of OSHPD.

  506 A .2 Certificate of occupancy. A certificate of occupancy shall be issued where it has been determined that the requirements for the new occupancy classification have been met.

  506 A .3 Stairways. An existing stairway shall not be required to comply with the requirements of Section 1011 of the California Build- ing Code where the existing space and construction does not allow a reduction in pitch or slope.

  506 A .4 Existing emergency escape and rescue openings. Where a change of occupancy would require an emergency escape and rescue opening in accordance with Section 1031.1 of the California Building Code, operable windows serving as the emergency escape and rescue opening shall comply with the following:

  1. An existing operable window shall provide a minimum net clear opening of 4 square feet (0.38 m [2] ) with a minimum net clear opening height of 22 inches (559 mm) and a minimum net clear opening width of 20 inches (508 mm).
  2. A replacement window where such window complies with both of the following: 2.1. The replacement window meets the size requirements in Item 1. 2.2. The replacement window is the manufacturer’s largest standard size window that will fit within the existing frame or existing rough opening. The replacement window shall be permitted to be of the same operating style as the existing window or a style that provides for an equal or greater window opening area than the existing window.

  506 A .5 Structural. Any building undergoing a change of occupancy shall satisfy the requirements of this section.

  506 A .5.1 Live loads. Structural elements carrying tributary live loads from an area with a change of occupancy shall satisfy the requirements of Section 1607 A of the California Building Code . Design live loads for areas of new occupancy shall be based on Section 1607 A of the California Building Code . Design live loads for other areas shall be permitted to use previously approved design live loads.

  Exception: Structural elements whose demand-capacity ratio considering the change of occupancy is not more than 5 percent greater than the demand-capacity ratio based on previously approved live loads need not comply with this section.

  506 A .5.2 Snow and wind loads. Where a change of occupancy results in a structure being assigned to a higher risk category, the structure shall satisfy the requirements of Sections 1608 A and 1609 A of the California Building Code for the new risk category.

  Exception: Where the area of the new occupancy is less than 10 percent of the building area, compliance with this section is not required. The cumulative effect of occupancy changes over time shall be considered.

• CBC § 1010.2.3 Medium relevance — show source text

  Hardware 1010.2.3 Toilet facilities for public pools Chapter 29

  Technical Production Areas 410.2.2, 410.5.3 Telephone Exchanges 304 Telescopic Seating (see Bleachers) Temporary Structures 3103 Certificate of occupancy 108.3, 111.3 Conformance 108.2, 3103.1.2 Construction documents 3103.2 Encroachment, public rights-ofway 3202.3 Flood provisions G113 Means of egress 3103.4 Permit 108.1, 3103.1.3 Power, temporary 108.3, 112.2 Structural 3103.6 Termination of approval 108.4 Tenant Separation Covered and open mall building 402.4.2.1, 708.1 Tents (see Temporary Structures) Termites, Protection From 2304.12 Terra Cotta 1404.10, 1411

  INDEX-20 2025 CALIFORNIA BUILDING CODE

  on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  INDEX

  Unlimited Area Buildings 507 Unsafe Structures and Equipment (see Structures, Unsafe) 116 Appeals 113, Appendix B Revocation of permit 105.6 Stop work orders 115 Utilities disconnection 112.3

  Unstable Materials 307.3, Table 414.2.5.1, Table 414.5.1, Table 415.6.5, 415.7.1, 415.9 Unusable Space 711.2.6 Use and Occupancy Chapter 3 Accessory 508.2 Classification 302.1

  Detailed requirements based on occupancy and use Chapter 4 Incidental uses 509, Table 509.1 Mixed 508.3, 508.4 Use designation 302.2 Utilities 112

  Service connection 112.1

  Service disconnection 112.3

  Temporary connection 112.2 Utility and Miscellaneous Occupancy (Group U) 312 Accessibility Chapters 11A and 11B Agricultural buildings Appendix C Area 503, 505, 506, 507, 508 Flood provisions Appendix G Height 503, 504, 508 Incidental uses 509

  Live loads Table 1607.1 Means of egress Exit signs 1013.1 Stairway, exit access 1019 Mixed occupancies 508.3, 508.4 Special provisions Private garages and carports 406.3 Residential aircraft hangars 412.4 Sprinkler protection 903.2.11 Travel distance 1006.2.1, 1006.3,

  1017.1 UV Germicidal Irradiation Systems

  1211