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Chapter 31 — SPECIAL CONSTRUCTION

Section 3113 — RELOCATABLE BUILDINGS

2025 California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-07-29 · California

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

3113.1 General.

The provisions of this section shall apply to relocatable buildings. Relocatable buildings manufactured after the effective date of this code shall comply with the applicable provisions of this code. [DSA-SS and DSA-SS/CC] as enforced by the enforcement agency.

Exception: This section shall not apply to manufactured housing used as dwellings.

[HCD] The provisions of Section 3113 are not applicable to commercial modulars, manufactured homes, mobilehomes, multi-unit manu- factured housing and special purpose commercial modulars as defined in Health and Safety Code Sections 18001.8, 18007, 18008, 18008.7 and 18012.5, respectively. These structures are subject to installation/reinstallation requirements specified in the Mobilehome

31-12 2025 CALIFORNIA BUILDING CODE

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

SPECIAL CONSTRUCTION

Parks Act (Health and Safety Code Section 18200 et seq.) and the California Code of Regulations, Title 25, Division 1, Chapter 2. Manufac- tured homes must meet unit identification (data plate) and certification label requirements as specified in the Code of Federal Regulations, Title 24, Subtitle B, Chapter XX, Part 3280 and Health and Safety Code Section 18032. Commercial modulars and special purpose commercial modulars must meet identification requirements in the California Code of Regulations, Title 25, Division 1, Chapter 3, Subchapter 2.

3113.1.1 Compliance. A newly constructed relocatable building shall comply with the requirements of this code for new construction. [DSA-SS and DSA-SS/CC] as enforced by the enforcement agency. An existing relocatable building that is undergoing alteration, addition, change of occupancy or relocation shall comply with Chapter 14 of the California Existing Building Code .

Exception: [DSA-SS and DSA-SS/CC] An existing relocatable public school building that is undergoing alteration, addition or change of occupancy shall comply with Chapter 3 of the California Existing Building Code.

3113.2 Supplemental information.

Supplemental information specific to a relocatable building shall be submitted to the authority having jurisdiction. It shall, as a minimum, include the following in addition to the information required by Section 105:

Exception: [DSA-SS and DSA-SS/CC] Supplemental information specific to a relocatable building shall be submitted to the enforce- ment agency. It shall, as a minimum, include the following in addition to the information required by Section 1603A:

  1. Manufacturer’s name and address.

  2. Date of manufacture.

  3. Serial number of module.

  4. Manufacturer’s design drawings.

  5. Type of construction in accordance with Section 602.

  6. Design loads including: roof live load, roof snow load, floor live load, wind load and seismic site class, use group and design category.

  7. Additional building planning and structural design data.

  8. Site-built structure or appurtenance attached to the relocatable building.

3113.3 Manufacturer’s data plate.

Each relocatable module shall have a data plate that is permanently attached on or adjacent to the electrical panel, and shall include the following information:

  1. Occupancy group.

  2. Manufacturer’s name and address.

  3. Date of manufacture.

  4. Serial number of module.

  5. Design roof live load, design floor live load, snow load, wind and seismic design.

  6. Approved quality assurance agency or approved inspection agency.

  7. Codes and standards of construction.

  8. Envelope thermal resistance values.

  9. Electrical service size.

  10. Fuel-burning equipment and size.

  11. Special limitations if any.

Exception: [DSA-SS and DSA-SS/CC] Each relocatable module shall have two metal identification labels permanently attached to the structure as enforced by the enforcement agency.

3113.4 Inspection agencies.

The building official is authorized to accept reports of inspections conducted by approved inspection agencies during off-site construction of the relocatable building, and to satisfy the applicable requirements of Sections 110.3 through 110.3.12.1.

Exception: [DSA-SS and DSA-SS/CC] Each relocatable module shall be inspected during construction and installation at the project site by project inspectors acceptable to the enforcement agency in accordance with Part 1, California Administrative Code, Title 24, CCR.

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▸ Contents — 2025 California Building Code (Title 24, Part 2)
2025 California Building Code (Title 24, Part 2)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — OCCUPANCY CLASSIFICATION AND USE
  4. Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY A…
  5. Chapter 5 — GENERAL BUILDING HEIGHTS AND AREAS
  6. Chapter 6 — TYPES OF CONSTRUCTION
  7. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  8. Chapter 7A — MATERIALS AND CONSTRUCTION METHODS FOR EXTERIOR W…
  9. Chapter 8 — INTERIOR FINISHES
  10. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  11. Chapter 10 — MEANS OF EGRESS
  12. Chapter 11 — RESERVED
  13. Chapter 11A — HOUSING ACCESSIBILITY
  14. Chapter 11B — ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMM…
  15. Chapter 12 — INTERIOR ENVIRONMENT
  16. Chapter 13 — ENERGY EFFICIENCY
  17. Chapter 14 — EXTERIOR WALLS
  18. Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES
  19. Chapter 16 — STRUCTURAL DESIGN
  20. Chapter 16A — STRUCTURAL DESIGN
  21. Chapter 17 — SPECIAL INSPECTIONS AND TESTS
  22. Chapter 17A — SPECIAL INSPECTIONS AND TESTS
  23. Chapter 18 — SOILS AND FOUNDATIONS
  24. Chapter 18A — SOILS AND FOUNDATIONS
  25. Chapter 19 — CONCRETE
  26. Chapter 19A — CONCRETE
  27. Chapter 20 — ALUMINUM
  28. Chapter 21 — MASONRY
  29. Chapter 21A — MASONRY
  30. Chapter 22 — STEEL
  31. Chapter 22A — STEEL
  32. Chapter 23 — WOOD
  33. Chapter 24 — GLASS AND GLAZING
  34. Chapter 25 — GYPSUM PANEL PRODUCTS AND PLASTER
  35. Chapter 26 — PLASTIC
  36. Chapter 27 — ELECTRICAL
  37. Chapter 28 — MECHANICAL SYSTEMS
  38. Chapter 29 — PLUMBING SYSTEMS
  39. Chapter 30 — ELEVATORS AND CONVEYING SYSTEMS
  40. ▸ Chapter 31 — SPECIAL CONSTRUCTION
    Overview
    1. Section 3101 — GENERAL
    2. Section 3102 — MEMBRANE STRUCTURES
    3. Section 3103 — TEMPORARY STRUCTURES
    4. Section 3104 — PEDESTRIAN WALKWAYS AND TUNNELS
    5. Section 3105 — AWNINGS AND CANOPIES
    6. Section 3106 — MARQUEES
    7. Section 3107 — SIGNS
    8. Section 3108 — TELECOMMUNICATION AND BROADCAST TOWERS
    9. Section 3109 — SWIMMING POOLS, SPAS AND HOT TUBS
    10. Section 3110 — AUTOMATIC VEHICULAR GATES
    11. Section 3111 — SOLAR ENERGY SYSTEMS
    12. Section 3112 — GREENHOUSES
    13. Section 3113 — RELOCATABLE BUILDINGS
    14. Section 3114 — INTERMODAL SHIPPING CONTAINERS
  41. Chapter 31A — SYSTEMS FOR WINDOW CLEANING OR EXTERIOR BUILDING…
  42. Chapter 31B — PUBLIC POOLS
  43. Chapter 31C — RADIATION
  44. Chapter 31D — FOOD ESTABLISHMENTS
  45. Chapter 31F — MARINE OIL TERMINALS
  46. Chapter 32 — ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
  47. Chapter 33 — SAFEGUARDS DURING CONSTRUCTION
  48. Chapter 34 — RESERVED
  49. Chapter 35 — REFERENCED STANDARDS
  50. Appendix A — EMPLOYEE QUALIFICATIONS
  51. Appendix B — BOARD OF APPEALS
  52. Appendix C — GROUP U—AGRICULTURAL BUILDINGS
  53. Appendix D — FIRE DISTRICTS
  54. Appendix E — RESERVED
  55. Appendix F — RODENTPROOFING
  56. Appendix G — FLOOD-RESISTANT CONSTRUCTION
  57. Appendix H — SIGNS
  58. Appendix I — PATIO COVERS
  59. Appendix J — GRADING
  60. Appendix K — GROUP R-3 AND GROUP R-3.1 OCCUPANCIES PROTECTED B…
  61. Appendix L — EARTHQUAKE RECORDING INSTRUMENTATION
  62. Appendix M — TSUNAMI-GENERATED FLOOD HAZARDS
  63. Appendix N — REPLICABLE BUILDINGS
  64. Appendix O — PERFORMANCE-BASED APPLICATION
  65. Appendix P — SLEEPING LOFTS
  66. Appendix Q — EMERGENCY HOUSING

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