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Chapter 1 — ADMINISTRATION

Section 1.8.2 — AUTHORITY AND ABBREVIATIONS

2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-07-29 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

1.8.2.1 General. The Department of Housing and Community Development is authorized by law to promulgate and adopt building stan- dards and regulations for several types of building applications. The applications under the authority of the Department of Housing and Community Development are listed in Sections 1.8.2.1.1 through 1.8.2.1.3.

1.8.2.1.1 Housing construction.

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

DIVISION I CALIFORNIA ADMINISTRATION

Application— Hotels, motels, lodging houses, apartments, dwellings, dormitories, condominiums, shelters for homeless persons, congregate residences, employee housing, factory-built housing and other types of dwellings containing sleeping accommodations with or without common toilet or cooking facilities including accessory buildings, facilities and uses thereto. Sections of this code which pertain to applications listed in this section are identified using the abbreviation “HCD 1.”

Enforcing agency— Local building department or the Department of Housing and Community Development.

Authority cited— Health and Safety Code Sections 17040, 17920.9, 17921, 17921.5, 17921.6, 17921.10, 17922, 17922.6, 17922.12, 17922.14, 17926, 17927, 17928, 17958.12, 18938.3, 18944.11 and 19990; and Government Code Section 12955.1.

Reference— Business and Professions Code, Division 5; Health and Safety Code Sections 17000 through 17062.5, 17910 through 17995.5, 18200 through 18700, 18860 through 18874, 18938.6, 18941, 19890, 19891, 19892 and 19960 through 19997; Civil Code Sections 832, 1101.4, 1101.5, 1954.201, 1954.202 and 5551; Government Code Sections 8698.4, 12955.1 and 12955.1.1; and California Code of Regulations, Title 20, Sections 1605.1, 1605.3 and 1607.

1.8.2.1.2 Housing accessibility.

Application— Covered multifamily dwellings as defined in Chapter 2 of the California Building Code including, but not limited to, lodg- ing houses, dormitories, timeshares, condominiums, shelters for homeless persons, congregate residences, apartments, dwellings, employee housing, factory-built housing and other types of dwellings containing sleeping accommodations with or without common toilet or cooking facilities.

amily dwellings as defined in Chapter 2 of the California Building Code including, but not limited to, lodg-_ ing houses, dormitories, timeshares, condominiums, shelters for homeless persons, congregate residences, apartments, dwellings, employee housing, factory-built housing and other types of dwellings containing sleeping accommodations with or without common toilet or cooking facilities.

Sections of this code identified by the abbreviation “HCD 1-AC” require specific accommodations for persons with disabilities as defined in Chapter 2 of the California Building Code. The application of such provisions shall be in conjunction with other require- ments of the Building Standards Code and apply only to newly constructed covered multifamily dwellings as defined in Chapter 2 of the California Building Code. “HCD 1-AC” applications include, but are not limited to, the following: 1. All newly constructed covered multifamily dwellings as defined in Chapter 2 of the California Building Code. 2. New common use areas as defined in Chapter 2 of the California Building Code serving existing covered multifamily dwellings. 3. Additions to existing buildings, where the addition alone meets the definition of covered multifamily dwellings as defined in Chapter 2 of the California Building Code. 4. New common use areas serving new covered multifamily dwellings. 5. Where any portion of a building’s exterior is preserved, but the interior of the building is removed, including all structural portions of floors and ceilings, the building is considered a new building for determining the application of California Build- ing Code, Chapter 11A.

“HCD 1-AC” building standards generally do not apply to public use areas or public accommodations such as hotels and motels and public housing. Public use areas, public accommodations and public housing, as defined in Chapter 2 of the California Build- ing Code, are subject to the Division of the State Architect (DSA-AC) in Chapter 11B and are referenced in California Building Code Section 1.9.1.

Enforcing agency— Local building department or the Department of Housing and Community Development.

Authority cited— Health and Safety Code Sections 17040, 17920.9, 17921, 17921.5, 17921.6, 17921.10, 17922, 17922.6, 17922.12, 17922.14, 17926, 17927, 17928, 17958.12, 18938.3, 18944.11 and 19990; and Government Code Sections 12955.1 and 12955.1.1.

Reference— Health and Safety Code Sections 17000 through 17062.5, 17910 through 17995.5, 18200 through 18700, 18860 through 18874, 18938.6, 18941, 19890, 19891, 19892 and 19960 through 19997; Civil Code Sections 1101.4, 1101.5, 1954.201 and 1954.202; Government Code Sections 12955.1 and 12955.1.1; and California Code of Regulations, Title 20, Sections 1605.1, 1605.3 and 1607.

1.8.2.1.3 Permanent buildings in mobilehome parks and special occupancy parks.

Application— Permanent buildings, and permanent accessory buildings or structures, constructed within mobilehome parks and special occupancy parks that are under the control and ownership of the park operator. Sections of this code which pertain to applications listed in this section are identified using the abbreviation “HCD 2.”

Enforcing agency— The Department of Housing and Community Development, local building department or other local agency that has assumed responsibility for the enforcement of Health and Safety Code, Division 13, Part 2.1, commencing with Section 18200 for mobilehome parks and Health and Safety Code, Division 13, Part 2.3, commencing with Section 18860 for special occu- pancy parks.

Authority cited— Health and Safety Code Sections 17040, 17920.9, 17921, 17921.5, 17921.6, 17921.10, 17922, 17922.6, 17922.12, 17922.14, 17926, 17927, 17928, 17958.12, 18552, 18554, 18620, 18630, 18640, 18670, 18690, 18691, 18865, 18871.3, 18871.4, 18873, 18873.1 through 18873.5, 18938.3, 18944.11 and 19990; and Government Code Section 12955.1.

Reference— Health and Safety Code Sections 17000 through 17062.5, 17910 through 17995.5, 18200 through 18700, 18860 through 18874, 18941, 19890, 19891, 19892 and 19960 through 19997; Civil Code Sections 1101.4, 1101.5 and 1954.201; Government Code Sections 12955.1 and 12955.1.1; and California Code of Regulations, Title 20, Sections 1605.1, 1605.3 and 1607.

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▸ Contents — 2025 California Residential Code (Title 24, Part 2.5)
2025 California Residential Code (Title 24, Part 2.5)
  1. ▸ Chapter 1 — ADMINISTRATION
    Overview
    1. Section 1.1 — GENERAL
    2. Section 1.2 — RESERVED
    3. Section 1.3 — RESERVED
    4. Section 1.4 — RESERVED
    5. Section 1.5 — RESERVED
    6. Section 1.6 — RESERVED
    7. Section 1.7 — RESERVED
    8. Section 1.8 — DEPARTMENT OF HOUSING AND COMMUNITY DEVELOPMENT …
    9. Section 1.8.2 — AUTHORITY AND ABBREVIATIONS
    10. Section 1.8.3 — LOCAL ENFORCING AGENCY
    11. Section 1.8.4 — PERMITS, FEES, APPLICATIONS AND INSPECTIONS
    12. Section 1.8.5 — RIGHT OF ENTRY FOR ENFORCEMENT
    13. Section 1.8.6 — LOCAL MODIFICATION BY ORDINANCE OR REGULATION
    14. Section 1.8.7 — ALTERNATE MATERIALS, DESIGNS, TESTS AND METHOD…
    15. Section 1.8.8 — APPEALS BOARD
    16. Section 1.8.9 — UNSAFE BUILDINGS OR STRUCTURES
    17. Section 1.8.10 — OTHER BUILDING REGULATIONS
    18. Section 1.9 — RESERVED
    19. Section 1.10 — RESERVED
    20. Section 1.11 — OFFICE OF THE STATE FIRE MARSHAL
    21. Section 1.12 — RESERVED
    22. Section 1.13 — RESERVED
    23. Section 1.14 — RESERVED
    24. Section R101 — SCOPE AND GENERAL REQUIREMENTS
    25. Section R102 — APPLICABILITY
    26. Section R103 — CODE COMPLIANCE AGENCY
    27. Section R104 — DUTIES AND POWERS OF THE BUILDING OFFICIAL
    28. Section R105 — PERMITS
    29. Section R106 — CONSTRUCTION DOCUMENTS
    30. Section R107 — TEMPORARY STRUCTURES AND USES
    31. Section R108 — FEES
    32. Section R109 — INSPECTIONS
    33. Section R110 — CERTIFICATE OF OCCUPANCY
    34. Section R111 — SERVICE UTILITIES
    35. Section R112 — MEANS OF APPEALS
    36. Section R113 — VIOLATIONS
    37. Section R114 — STOP WORK ORDER
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. Chapter 8 — ROOF-CEILING CONSTRUCTION
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix AA — BOARD OF APPEALS
  13. Appendix AB — PERMIT FEES
  14. Appendix AC — RESERVED
  15. Appendix BA — RESERVED
  16. Appendix BB — TINY HOUSES
  17. Appendix BC — RESERVED
  18. Appendix BD — RESERVED
  19. Appendix BE — RADON CONTROL METHODS
  20. Appendix BF — PATIO COVERS
  21. Appendix BG — SOUND TRANSMISSION
  22. Appendix BH — AUTOMATIC VEHICULAR GATES
  23. Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
  24. Appendix BJ — STRAWBALE CONSTRUCTION
  25. Appendix BK — COB CONSTRUCTION (MONOLITHIC ADOBE)
  26. Appendix BL — HEMP-LIME (HEMPCRETE) CONSTRUCTION
  27. Appendix BM — 3D-PRINTED BUILDING CONSTRUCTION
  28. Appendix BN — EXTENDED PLATE WALL CONSTRUCTION
  29. Appendix BO — EXISTING BUILDINGS AND STRUCTURES
  30. Appendix CA — RESERVED
  31. Appendix CB — RESERVED
  32. Appendix CC — RESERVED
  33. Appendix CD — RESERVED
  34. Appendix CE — RESERVED
  35. Appendix CF — RESERVED
  36. Appendix CG — NONSEWERED SANITATION SYSTEMS
  37. Appendix CH — PRIVATE SEWAGE DISPOSAL
  38. Appendix CI — SWIMMING POOL SAFETY ACT
  39. Appendix CJ — EMERGENCY HOUSING
  40. Appendix CK — AREAS PROTECTED BY THE FACILITIES OF THE CENTRAL…

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