1102 Heights and Areas — 2025 California Existing Building Code
California Existing Building Code (Title 24, Part 10) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Existing Building Code (Title 24, Part 10) § 1102 · Effective January 1, 2026 · Official source: Building Standards Commission
1102.1 Height limitations.¶
An addition shall not increase the height of an existing building beyond that permitted under the applicable provisions of Chapter 5 of the California Building Code for new buildings.
1102.2 Area limitations.¶
An addition shall not increase the area of an existing building beyond that permitted under the applicable provisions of Chapter 5 of the California Building Code for new buildings unless fire separation as required by the California Building Code is provided.
1102.3 Fire protection systems.¶
Existing fire areas increased by the addition shall comply with Chapter 9 of the California Building Code .
Exception: Nonoccupiable appendages, such as elevator and exit stairway shafts, shall be permitted beyond that permitted by the California Building Code .
1102.4 Systems out of service.¶
Existing fire alarm and detection systems shall be maintained in accordance with Section 901.7 of the California Fire Code. Site fire protection during construction shall be in accordance with Chapter 33 of the California Building and Califor- nia Fire Codes.
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