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Chapter 3 — PROVISIONS FOR ALL COMPLIANCE METHODS

Section 318 — [BSC, DSA-SS & DSA-SS/CC]—DEFINITIONS

2025 California Existing Building Code (Title 24, Part 10) · 2025 edition · updated 2026-07-29 · California

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

318.1 In addition to the definitions given in Section 202, for the purposes of Sections…

follows:

[DSA-SS & DSA-SS/CC] For the purposes of Section 317 through 323, definitions of terms given in Section 4-207 or 4-314 of the California Administrative Code govern over those in Section 202.

ADDITION [BSC] means any work that increases the floor or roof area or the volume of enclosed space of an existing building, and is structurally attached to the existing building by connections that are required for transmitting vertical or horizontal loads between the addition and the existing structure.

ALTERATION [BSC] means any change within or to an existing building, which does not increase and may decrease the floor or roof area or the volume of enclosed space.

BSE-C RESPONSE ACCELERATION PARAMETERS [BSC] are the parameters (S XS and S X1 ) taken from 5-percent/50-year maximum direction spectral response acceleration curves or by a Site Specific Response Spectrum developed in accordance with ASCE 41, Section 2.3.3.

BSE-R RESPONSE ACCELERATION PARAMETERS [BSC] are the parameters (S XS and S X1 ) taken from 20-percent /50-year maximum direction spectral response acceleration curves or by a Site Specific Response Spectrum developed in accordance with ASCE 41, Section 2.3.3.

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▸ Contents — 2025 California Existing Building Code (Title 24, Part 10)
2025 California Existing Building Code (Title 24, Part 10)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. ▸ Chapter 3 — PROVISIONS FOR ALL COMPLIANCE METHODS
    Overview
    1. Section 301 — ADMINISTRATION
    2. Section 302 — GENERAL PROVISIONS
    3. Section 303 — STORM SHELTERS
    4. Section 304 — STRUCTURAL DESIGN LOADS AND EVALUATION AND DESIG…
    5. Section 305 — IN-SITU LOAD TESTS
    6. Section 306 — ACCESSIBILITY FOR EXISTING BUILDINGS
    7. Section 307 — SMOKE ALARMS
    8. Section 308 — CARBON MONOXIDE DETECTION
    9. Section 309 — ADDITIONS AND REPLACEMENTS OF EXTERIOR WALL COVE…
    10. Section 310 — [OSHPD 1R, 2 AND 5]—SERVICES/SYSTEMS AND UTILITIES
    11. Section 311 — [OSHPD 1R, 2 AND 5]—MEANS OF EGRESS
    12. Section 312 — [OSHPD 1R]—HOSPITAL SPC AND FREESTANDING BUILDIN…
    13. Section 313 — [SFM]—EXISTING GROUP R-1 AND GROUP R-2 OCCUPANCIES
    14. Section 314 — [SFM]—EXISTING HIGH-RISE BUILDINGS
    15. Section 315 — [SFM]—EXISTING GROUP I OCCUPANCIES
    16. Section 316 — [SFM]—EXISTING GROUP L OCCUPANCIES
    17. Section 317 — [BSC, DSA-SS & DSA-SS/CC]—EARTHQUAKE EVALUATION …
    18. Section 318 — [BSC, DSA-SS & DSA-SS/CC]—DEFINITIONS
    19. Section 319 — [BSC, DSA-SS & DSA-SS/CC]—SEISMIC CRITERIA SELEC…
    20. Section 320 — [BSC, DSA-SS & DSA-SS/CC]—METHOD A
    21. Section 321 — [BSC, DSA-SS & DSA-SS/CC]—METHOD B
    22. Section 322 — [BSC, DSA-SS & DSA-SS/CC]—PEER REVIEW REQUIREMENTS
    23. Section 323 — [DSA-SS, DSA-SS/CC]—ADDITIONAL REQUIREMENTS FOR …
  4. Chapter 3A — PROVISIONS FOR ALL COMPLIANCE METHODS
  5. Chapter 4 — REPAIRS
  6. Chapter 4A — REPAIRS
  7. Chapter 5 — PRESCRIPTIVE COMPLIANCE METHOD
  8. Chapter 5A — PRESCRIPTIVE COMPLIANCE METHOD
  9. Chapter 6 — CLASSIFICATION OF WORK
  10. Chapter 7 — ALTERATIONS—LEVEL 1
  11. Chapter 8 — ALTERATIONS—LEVEL 2
  12. Chapter 9 — ALTERATIONS—LEVEL 3
  13. Chapter 10 — CHANGE OF OCCUPANCY
  14. Chapter 11 — ADDITIONS
  15. Chapter 12 — HISTORIC BUILDINGS
  16. Chapter 13 — PERFORMANCE COMPLIANCE METHODS
  17. Chapter 14 — RELOCATED OR MOVED BUILDINGS
  18. Chapter 15 — CONSTRUCTION SAFEGUARDS
  19. Chapter 16 — REFERENCED STANDARDS
  20. Appendix A — GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING B…
  21. Appendix B — SUPPLEMENTARY ACCESSIBILITY REQUIREMENTS FOR EXIS…
  22. Appendix C — GUIDELINES FOR THE WIND RETROFIT OF EXISTING BUIL…
  23. Appendix D — BOARD OF APPEALS
  24. Appendix E — TEMPORARY EMERGENCY USES
  25. Appendix A — GUIDELINES ON FIRE RATINGS OF ARCHAIC MATERIALS A…

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