No San Francisco Existing Building Code Amendments. Add the following appendices:

CALIFORNIA EXISTING BUILDING CODE (CEBC) APPENDICES

CALIFORNIA EXISTING BUILDING CODE (CEBC) APPENDICES

(CEBC) APPENDIX A CHAPTER A1 SEISMIC STRENGTHENING PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS

(CEBC) APPENDIX A CHAPTER A1 SEISMIC STRENGTHENING PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS

No San Francisco Existing Building Code Amendments

(CEBC) APPENDIX A CHAPTER A2 EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAMS1

(CEBC) APPENDIX A CHAPTER A2 EARTHQUAKE HAZARD REDUCTION IN EXISTING REINFORCED CONCRETE AND REINFORCED MASONRY WALL BUILDINGS WITH FLEXIBLE DIAPHRAMS¹

No San Francisco Existing Building Code Amendments

(CEBC) APPENDIX A CHAPTER A3 PRESCRIPTIVE PROVISIONS FOR SEISMIC STRENGTHENING OF CRIPPLE WALLS AND SILL PLATE ANCHORAGE OF LIGHT, WOOD-FRAME RESIDENTIAL BUILDINGS

(CEBC) APPENDIX A CHAPTER A3 PRESCRIPTIVE PROVISIONS FOR SEISMIC STRENGTHENING OF CRIPPLE WALLS AND SILL PLATE ANCHORAGE OF LIGHT, WOOD-FRAME RESIDENTIAL BUILDINGS

No San Francisco Existing Building Code Amendments

(CEBC) APPENDIX A CHAPTER A4 EARTHQUAKE RISK REDUCTION IN WOODFRAME RESIDENTIAL BUILDINGS WITH SOFT, WEAK OR OPEN FRONT WALLS

(CEBC) APPENDIX A CHAPTER A4 EARTHQUAKE RISK REDUCTION IN WOOD-FRAME RESIDENTIAL BUILDINGS WITH SOFT, WEAK OR OPEN FRONT WALLS

No San Francisco Existing Building Code Amendments

(CEBC) APPENDIX A CHAPTER A5 REFERENCED STANDARDS

(CEBC) APPENDIX A CHAPTER A5 REFERENCED STANDARDS

No San Francisco Existing Building Code Amendments

[APPENDIX A CHAPTER A6 SEISMIC RETROFIT PROVISIONS FOR CONCRETE BUILDINGS]1

[APPENDIX A CHAPTER A6 SEISMIC RETROFIT PROVISIONS FOR CONCRETE

BUILDINGS]¹

CODIFICATION NOTE

1. Ord. 70-25 did not mark the Chapter A6 heading for addition. The heading has been included here for reference, with square brackets indicating that it is unofficial.

A6.1 Intent. This Chapter A6 establishes seismic retrofit provisions intended to reduce the collapse risk of the most vulnerable Concrete Buildings (CB), as defined in Chapter 5G.

A6.2 Definitions

In addition to the definitions in San Francisco Building Code Chapter 2 and San Francisco Existing Building Code Chapter 2, the following shall apply for purposes of this Chapter A6:

Wall pier. A vertical wall segment within a structural wall, bounded horizontally by two openings or by an opening and an edge, with ratio of horizontal length to wall thickness less than or equal to 6.0, and ratio of clear height to horizontal length greater than 2.0.

A6.3 Design Professionals. All evaluations and design intended to comply with this Chapter shall be performed by or under the supervision of appropriately licensed individuals, and all documents submitted for compliance shall be sealed by a California licensed civil or structural engineer.

A6.4 Structural engineering criteria

A6.4.1 Engineering criteria. For a Concrete Building to comply with this Chapter, the building shall satisfy one of the Engineering Criteria Options per Table A6.4-1, by seismic evaluation or seismic retrofit.

Table A6.4-1: Engineering Criteria Options

Table A6.4-2: Seismic deficiencies to be addressed by Engineering Criteria Option (a)

Weak story: The structure includes one or more stories having lateral strength less than the story above.

Lateral-force-resisting-element irregularity: The lateral force-resisting system includes one or more concrete walls or frames that are not continuous to the foundation.

Non-ductile moment frame: The main lateral-force-resisting-system includes concrete moment frames that do not satisfy strongcolumn-weak-beam requirements or that have shear-governed columns or beams. Shear-governed concrete column or wall pier: The structure includes one or more concrete columns or wall piers that are sheargoverned and susceptible to failure resulting in loss of gravity load support. Punching shear in concrete slab: One or more concrete floor or roof slabs are supported by one or more columns without beams framing into the column and is susceptible to loss of gravity load support following punching shear failure. Weak connection of concrete wall to flexible diaphragm: The structure includes one or more concrete walls connected to one or more flexible diaphragms, where the wall is not adequately anchored to the diaphragm. Inadequate length of bearing connection: One or more concrete beams or slabs are supported by a bearing connection with short bearing length.

A6.4.2 Building separation. The building separation limitations of Section 7.2.13 of ASCE 41 need not be considered.

A6.4.3 Liquefaction or landslide risk. If the building is located in a zone of high or very high risk of soil liquefaction or landslide, as indicated by the current State of California Seismic Hazard Zones Map for San Francisco, the Owner’s Engineer shall so notify the Owner in writing. Aside from such notification, soil liquefaction, lateral spreading, and landslide are not required to be addressed in the seismic evaluation or retrofit design. This Chapter does not exempt the building from the requirements of the Slope and Seismic Hazard Zone Protection Act (San Francisco Building Code 106A.4.1.4) where applicable.

A6.4.4 Other retrofit triggers. If the project involves a Substantial Structural Alteration as defined in Section 503.11 or Non-structural Alteration as defined in Section 503.11.1, the building shall meet the more restrictive of the provisions of this Chapter or those of Section 304.4 (Minimum lateral force for existing buildings).

A6.4.5 Masonry Infill. For Concrete Buildings with masonry infill, the seismic evaluation and retrofitting shall account for the effect of the infill considering ASCE 41 requirements, and for Tier 2 and Tier 3 evaluations shall take into account:

• The peak strength that the infill can achieve.

• The potential for strength degradation of the infill.

• The potential for a weak story or story concentration of deformation, because of the locations of infill in the building, or because of potential concentrations of damage to infill.

• Plan torsion effects because of the location of infill in the building, or because of potential concentrations of damage to infill.

San Francisco, California

GREEN BUILDING CODE 2025 Edition

PUBLISHER'S NOTE

PUBLISHER'S NOTE

The full 2025 San Francisco Green Building Code consists of the 2025 California Green Building Standards Code, and as further amended by these San Francisco amendments.

The San Francisco Green Building Code amendments contained herein are designed to be used in conjunction with the 2025 California Green Building Standards Code.

The San Francisco Green Building Code amendments contained herein were adopted by the Board of Supervisors of the City and County of San Francisco on November 21, 2025, by Ordinance 229-25, effective December 22, 2025, and operative January 1, 2026.

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2025 San Francisco Amendments
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Note that prior to the 2013 revision of the Building Inspection Commission Codes, material derived from the California Green Building Standards Codes was published as Chapter 13C of the San Francisco Building Code. Supplements to this Code and complete copies of all seven

Building Inspection Commission (BIC) Codes

(Building, Electrical, Existing Building, Green Building, Housing, Mechanical, and Plumbing)

can be ordered from:

AMERICAN LEGAL PUBLISHING CORPORATION

Cincinnati, Ohio 45202

800-445-5588

Fax: 513-763-3562

www.amlegal.com

PREFACE

PREFACE

Text Format:

The text in this publication is formatted to allow the user to quickly and easily determine the source of the included material. Language derived from the 2025 California Code that is unchanged by local amendment is printed in shaded text (see below). Language constituting San Francisco amendments to the California Code is printed in unformatted (or “plain”) text. In either case, bold and/or italic typefaces may be used as appropriate for emphasis, etc. See below for examples.

To further simplify use of the San Francisco amendments with corresponding sections of the 2025 California Code, explanatory remarks appearing in italics are provided (in boxes at the beginning of affected provisions) indicating whether the San Francisco amendment to the California Code is adding, revising, or replacing a section or portion of a section.

To summarize:

Explanatory remarks are boxed and italicized.

Unchanged language from the 2025 California Code is shaded, and may include bold and/or italicized formatting. San Francisco amendments are printed in unformatted ("plain") text, and may include bold and/or italicized formatting.

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The arrow represents the location of language that has been deleted by San Francisco from the applicable California Code.

An arrow represents the location of language that has been deleted by San Francisco from the 2025 California Code. A solid line represents a change from the original published edition of the 2025 San Francisco Green Building Code.

Historical Notations:

Language which has been added, amended, or deleted from the 2025 publication of the San Francisco Green Building Code is indicated with an historical notation, setting forth the ordinance number and date of adoption. Additionally, a table is included below that lists and summarizes all legislation that has affected this Code and the other Building Inspection Commission codes after their initial enactment.