CEBC · California Existing Building Code
When can 'like' materials be used vs. new materials required?
If you're repairing an existing element, the California Existing Building Code generally allows you to use “like” materials so long as doing so does not create a hazard. Materials already in place that complied when installed may remain unless the code official declares them unsafe. But when a repair requires new structural members or would introduce hazardous materials prohibited for new construction, the replacement must meet current California Building Code requirements.
Last reviewed: July 6, 2026
What the code requires — plain English
- Use like materials for repairs and alterations when doing so does not create an unsafe condition. This rule is centered on § 302.4 and implemented in the repairs chapter through § 402.3.
- Materials already in place that complied when installed are allowed to remain unless the code official finds them unsafe (see § 302.3 and § 402.2).
Like-for-like repairs are permitted — but only where the replacement does not create or continue an unsafe condition; new structural members generally must meet the current code.
Requirements in detail
Core rules (short)
- Existing materials may remain in use unless declared unsafe by the code official (§ 302.3, referenced by § 402.2).
- Like materials are permitted for repairs and alterations provided they do not create a hazard to life, health or property; otherwise materials permitted for new construction must be used (§ 302.4, referenced by § 402.3).
- New structural members and connections added during repair/alteration must comply with the detailing provisions of the California Building Code for new buildings of similar structure, purpose and location (§ 302.4.1).
Decision table — when “like” is allowed vs. new materials required
| Component / situation | Like materials allowed? | Key condition / limit | Code reference |
|---|---|---|---|
| Non‑structural finishes (e.g., siding, trim) used in a repair | Yes, if no unsafe condition results | Repair must not create a hazard to life, health, property | § 302.4 — see § 402.3 |
| Existing installed materials already compliant when installed | N/A — may remain in use unless unsafe | Code official may require removal if found unsafe | § 302.3 — see § 402.2 |
| Replacement of a load‑bearing / structural member | No — new members must meet current CBC detailing for new buildings | New structural members and connections must comply with current CBC detailing for similar buildings | § 302.4.1 (referenced by § 402.3) |
| Materials that are hazardous (per new-construction code) | No — prohibited where new-construction code would prohibit | Hazardous materials not permitted where new code would not allow | § 302.4 — see § 402.3 |
| Glazing in hazardous locations (safety glazing) | Like glazing allowed only where specifically excepted | Replacement glazing in hazardous locations must meet CBC/CRC safety glazing rules; exception for glass block, louvered windows, jalousies repaired with like materials | § 402.1 and exception; § 402.3 for replacement material rule |
Notes:
- The CEBC's rules for repairs are implemented by Chapter 4; the short directives above are the repair‑specific carry-through of the general rules in Chapter 3. See § 302.3 (existing materials) and § 302.4 (new/replacement materials) as the foundation.
Practical checklist for the permit submittal / field decision
- Verify the component is a repair (not an alteration/addition that triggers other chapters). See Chapter 4 scope.
- Ask: does using the original (or similar) material create a hazard? If yes → use new‑construction materials / methods. See § 302.4.
- For any new or replaced structural member, provide details showing compliance with the California Building Code (CBC) as required by § 302.4.1.
- For glazing in hazardous locations, follow § 402.1 safety glazing requirements or document the specific exception allowed.
Exceptions & special cases
- Glass block, louvered windows and jalousies repaired with like materials are an explicit exception to the glazing replacement rule (§ 402.1).
- Local adoption notes: the CEBC includes agency-specific adoption language (for example HCD commentary) that can affect how § 302.4 is applied to housing—local ordinances may permit retention or replacement of original materials where the building originally complied at time of construction (see the HCD note in § 302.4).
- A single narrow exception in § 302.4: replacement residential garage doors may not be tied to an existing automatic opener without a battery backup if the opener lacks that feature (Health & Safety Code reference called out in the exception). This is a specific statutory prohibition embedded in the CEBC.
Common mistakes
- Treating every repair as “like‑for‑like” without evaluating safety — the code requires that like materials be used only where no unsafe condition will be created (§ 302.4 / § 402.3).
- Using “like” materials for a replacement that, in effect, creates a new structural member or connection — new members must meet CBC detailing for new construction (§ 302.4.1).
- Forgetting hazardous‑materials limits — some older materials that were allowed historically (asbestos, lead finishes, certain coatings) may be prohibited where the new‑construction code would not permit them (§ 302.4).
- Ignoring glazing safety — replacing glass in a hazardous location without meeting CBC/CRC safety glazing rules (unless the specific exception applies) (§ 402.1).
- Not checking local adoption notes (HCD, OSHPD, etc.) — state or local adoption can change applicability. See the adoption notes tied to the sections.
Worked example — concrete scenario
Scenario A (non‑structural repair): A homeowner replaces 20 ft² of rotted wood siding on an exterior wall of a 1950 house with the same wood profile and finish.
- Analysis: This is a repair of a non‑structural finish. Using like materials is permitted provided the replacement does not create an unsafe condition (e.g., increased fire hazard, moisture trapping, deteriorated support). Apply § 302.4; Chapter 4 carries this through at § 402.3. Result: like‑for‑like siding replacement is allowed, document condition and materials for the inspector.
Scenario B (structural member replacement): During the same project the contractor finds a joist with severe rot and proposes to replace it with a new engineered LVL member to match capacity. The joist is part of the floor framing that supports habitable space.
- Analysis: Replacing a load‑bearing member introduces a new structural member. Per § 302.4.1 (referenced by § 402.3), the new member and its connections must comply with the CBC detailing for new buildings of similar structure, purpose and location. Result: submit construction details showing the LVL sizing, connection details and compliance with CBC; do not assume “like” materials relax the detailing requirement.
Related provisions (quick reference)
- § 302.3 — Existing materials may remain in use unless determined unsafe.
- § 302.4 — New and replacement materials; like materials permitted for repairs provided no unsafe condition is created.
- § 302.4.1 — New structural members and connections must comply with California Building Code for new buildings.
- § 402.1 — Replacement glazing in hazardous locations; exception for glass block, louvered windows, jalousies.
- § 402.2 — Existing materials (refer back to § 302.3).
- § 402.3 — New and replacement materials for repairs (refer back to § 302.4).
- Chapter 4 (Repairs) — overall scope and limits on what is a repair vs. an alteration (context for deciding whether “like” materials apply).
Code references
Grounded in the retrieved California Existing Building Code — click a citation to read the verbatim passage:
CEBC § 302.3 High relevance — show source text
302.3 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the code official to be unsafe.
302.4 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided that unsafe conditions are not created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location. [HCD 1] Local ordinances or regulations shall permit the replacement, retention and extension of original materials, and the use of original methods of construction, for any building or accessory structure, provided such building or structure complied with the building code provisions in effect at the time of original construction and the building or accessory structure does not become or continue to be a substandard building. For additional information, see Health and Safety Code Sections 17912, 17920.3, 17922(d), 17922.3, 17958.8 and 17958.9.
Exception: No replacement residential garage door shall be installed to connect the replacement door to an existing residential automatic garage door opener that does not have a battery backup function designed to keep the garage door operational without interruption during an electrical outage. See Health and Safety Code Section 19892.
[BS] 302.4.1 New structural members and connections. New structural members and connections shall comply with the detailing provisions of the California Building Code for new buildings of similar structure, purpose and location.
Exception: Where alternative design criteria are specifically permitted.
302.5 Occupancy and use. Where determining the appropriate application of the referenced sections of this code, the occupancy and use of a building shall be determined in accordance with Chapter 3 of the California Building Code .
SECTION 303—STORM SHELTERS
303.1 General. This section applies to the design and construction of storm shelters for the purpose of providing protection during tornadoes, hurricanes and other severe windstorms.
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PROVISIONS FOR ALL COMPLIANCE METHODS
303.1.1 Construction. Storm shelters shall be constructed in accordance with Section 423 of the California Building Code and ICC 500 and shall be designated as hurricane shelters, tornado shelters or combined hurricane and tornado shelters.
Exception: Storm shelters added to critical emergency operations facilities or Group E occupancies are not required to comply with the travel distance in Section 423.4.2 or 423.5.2 of the California Building Code .
303.2 Addition to a Group E occupancy. Where an addition is added to an existing Group E occupancy located in an area where the shelter design wind speed for tornadoes is 250 mph (402.3 km/h) in accordance with Figure 304.2(1) of ICC 500 and the occupant load in the addition is 50 or more, the addition shall have a storm shelter constructed in accordance with ICC 500.
Exceptions:
- Group E day care facilities.
- Group E occupancies accessory to places of religious worship.
- Additions meeting the requirements for shelter design in ICC 500.
CEBC § 3A-3 High relevance — show source text
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PROVISIONS FOR ALL COMPLIANCE METHODS
302A.3.1 Existing seismic force-resisting systems. Where the existing seismic force-resisting system is a type that can be designated ordinary or is a welded steel moment frame constructed under a permit issued prior to October 25, 1994, values of R, W0 and Cd for the existing seismic force-resisting system shall be those specified by the California Building Code for an ordinary system unless it is demonstrated that the existing system will provide performance equivalent to that of a detailed, intermediate or special system.
302 A .4 New and replacement materials. Except as otherwise required or permitted by this code, materials and equipment permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided no hazard to life, health or property is c reated. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.
302 A .4.1 New structural members and connections. New structural members and connections shall comply with the detailing provisions of the California Building Code for new buildings of similar structure, purpose and location.
Exception: Where alternative design criteria are specifically permitted.
302 A .5 Occupancy and use. Where determining the appropriate application of the referenced sections of this code, the occupancy and use of a building shall be determined in accordance with Chapter 3 of the California Building Code .
302A.6 Maintenance. Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices or safe- guards which are required by this code shall be maintained in conformance with the code edition under which they were installed. The owner or the owner’s designated agent shall be responsible for the maintenance of buildings and structures. To determine compliance with this subsection, the building official shall have the authority to require a building or structure to be re-inspected. The requirements of this chapter shall not provide the basis for removal or abrogation of fire protection and safety systems and devices in existing structures.
302A.7 Construction documents for retrofit or rehabilitation. The design loads and other information pertinent to the structural design required by California Building Code Section 1603A shall be included in the drawings. In addition to the information required by California Building Code Section 1603A.1.5, the drawings shall show the ground motion hazard used for the retrofit or rehabilitation as either a percentage of the California Building Code prescribed ground motion for new hospital buildings, or ASCE 41 seismic hazard designation, or a probability of exceedance in a specified time period, or a return period for exceedance of the specified ground motion.
SECTION 303 A — RESERVED
SECTION 304 A —STRUCTURAL DESIGN LOADS AND EVALUATION AND DESIGN PROCEDURES
CEBC § 301.3.2 High relevance — show source text
301.3.2 Work area compliance method. A lterations, additions and changes of occupancy complying with the applicable requirements of Chapters 6 through 12 of this code shall be considered in compliance with the provisions of this code.
301.3.3 Performance compliance method. Alterations, additions and changes of occupancy complying with Chapter 13 of this code shall be considered in compliance with the provisions of this code.
Note: [HCD 1 & HCD 2] The provisions contained in Chapter 13 are not adopted by HCD, but may be available for adoption by a local ordinance. (See Section 1.1.11.)
301.4 Relocated or moved buildings. Relocated or moved buildings shall comply with the requirements of Chapter 14.
SECTION 302—GENERAL PROVISIONS
302.1 Dangerous conditions. The code official shall have the authority to require the elimination of conditions deemed dangerous.
302.1.1 Dangerous conditions. [BSC] Regardless of the extent of structural or nonstructural damage, the code official shall have the authority to require the elimination of conditions deemed dangerous.
302.2 Additional codes. Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in this code and the California Energy Code, California Fire Code, California Mechanical Code, California Plumbing Code, California Residential Code and California Electrical Code . Where provisions of the other codes conflict with provisions of this code, the provisions of this code shall take precedence.
302.2.1 Additional codes in health care. In existing Group I-2 occupancies, ambulatory health care facilities, outpatient clinics and hyperbaric facilities, alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall also comply with NFPA 99.
302.3 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the code official to be unsafe.
302.4 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided that unsafe conditions are not created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location. [HCD 1] Local ordinances or regulations shall permit the replacement, retention and extension of original materials, and the use of original methods of construction, for any building or accessory structure, provided such building or structure complied with the building code provisions in effect at the time of original construction and the building or accessory structure does not become or continue to be a substandard building. For additional information, see Health and Safety Code Sections 17912, 17920.3, 17922(d), 17922.3, 17958.8 and 17958.9.
Exception: No replacement residential garage door shall be installed to connect the replacement door to an existing residential automatic garage door opener that does not have a battery backup function designed to keep the garage door operational without interruption during an electrical outage. See Health and Safety Code Section 19892.
CEBC § 2.1 Medium relevance — show source text
SECTION 302 A —GENERAL PROVISIONS
302 A .1 Dangerous conditions. The code official shall have the authority to require the elimination of conditions deemed dangerous.
302 A .2 Additional codes. Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and struc- tures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in the California Fire Code, California Mechanical Code, California Plumbing Code and California Electrical Code. Where provisions of the other codes conflict with provisions of this chapter, the provisions of this chapter shall take precedence.
302 A .2.1 Additional codes in health care. In existing Group I-2 occupancies, ambulatory health care facilities, outpatient clinics and hyperbaric facilities, alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall also comply with NFPA 99.
302 A .3 Existing materials and equipment. Materials and equipment already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the code official to be unsafe in accordance with California Building Code Section 116.
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302A.3.1 Existing seismic force-resisting systems. Where the existing seismic force-resisting system is a type that can be designated ordinary or is a welded steel moment frame constructed under a permit issued prior to October 25, 1994, values of R, W0 and Cd for the existing seismic force-resisting system shall be those specified by the California Building Code for an ordinary system unless it is demonstrated that the existing system will provide performance equivalent to that of a detailed, intermediate or special system.
302 A .4 New and replacement materials. Except as otherwise required or permitted by this code, materials and equipment permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided no hazard to life, health or property is c reated. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.
302 A .4.1 New structural members and connections. New structural members and connections shall comply with the detailing provisions of the California Building Code for new buildings of similar structure, purpose and location.
Exception: Where alternative design criteria are specifically permitted.
302 A .5 Occupancy and use. Where determining the appropriate application of the referenced sections of this code, the occupancy and use of a building shall be determined in accordance with Chapter 3 of the California Building Code .
CEBC § 25.4 Medium relevance — show source text
per anchor for three-wythe minimum
walls.
2,700 lbs. for two-wythe walls.| |Shear boltse, f|Anchors embedded not less than 8 inches into unreinforced masonry
walls; anchors should be centered in 21/2-inch-diameter holes with
dry-pack or nonshrink grout around the circumference of the anchor.|The value for plain masonry specified for solid
masonry TMS 402; and no value larger than
those given for3/4-inch bolts should be used.| |Combined tension
and shear anchorsf|Through-anchors—anchors meeting the requirements for shear and
for tension anchors.b, c|Tension—same as for tension anchors.
Shear—same as for shear anchors.| |Combined tension
and shear anchorsf|Embedded anchors—anchors extending to the exterior face of the
wall with a 21/2-inch round plate under the head and drilled at an
angle of 221/2 degrees to the horizontal; installed as specified for
shear anchors.a, b, c|Tension—3,600 lbs. per anchor.
Shear—same as for shear anchors.|2025 CALIFORNIA EXISTING BUILDING CODE APPENDIX A-9
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APPENDIX A—GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING BUILDINGS
[BS] TABLE A108.1(2)—STRENGTH VALUES OF NEW MATERIALS USED IN CONJUNCTION WITH EXISTING CONSTRUCTION—continued Col2 Col3 NEW MATERIALS OR CONFIGURATION OF MATERIALS NEW MATERIALS OR CONFIGURATION OF MATERIALS STRENGTH VALUES Infilled walls Reinforced masonry infilled openings in existing unreinforced
masonry walls; provide keys or dowels to match reinforcing.Same as values specified for unreinforced
masonry walls.Reinforced masonryd Masonry piers and walls reinforced per the current building code. The value specified in the current building
code for strength design.Reinforced concreted Concrete footings, walls and piers reinforced as specified in the
current building code.The value specified in the current building
code for strength design.For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2, 1 pound = 4.4 N, 1 degree = 0.017 rad, 1 pound per foot = 14.43 N/m, 1 foot = 304.8 mm.
a. Embedded anchors to be tested as specified in Section A107.4.
b. Anchors shall be1/2 inch minimum in diameter.
c. Drilling for anchors shall be done with an electric rotary drill; impact tools should not be used for drilling holes or tightening anchors and shear bolt nuts.
d. Load factors or capacity reduction factors shall not be used.
e. Other bolt sizes, values and installation methods may be used, provided that a testing program is conducted in accordance with Section A107.5.3. The strength value shall be
determined by multiplying the calculated allowable value, determined in accordance with Section A107.5.3, by 3.0, and the usable value shall be limited to not greater than
1.5 times the value given in the table.CEBC § 109.3 Medium relevance — show source text
Adopting Agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6 Adopt Entire Chapter Adopt Entire Chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowX X X X X X X X X X X X X X Chapter / Section 109.3 – 109.3.11 X X 109.3.6 X X X X 109.3.7 X 110 X 111 X 113 X 114 X 115 X 116.1 X The state agency does not adopt sections identified with the following symbol : The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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1 ADMINISTRATION
DIVISION I CALIFORNIA ADMINISTRATION
SECTION 1.1—GENERAL
1.1.1 Title. These regulations shall be known as the California Existing Building Code, may be cited as such and will be referred to herein as “this code.” The California Existing Building Code is Part 10 of thirteen parts of the official compilation and publication of the adoption, amendment and repeal of building regulations to the California Code of Regulations, Title 24, also referred to as the California Building Standards Code. This part incorporates by adoption the 2024 International Existing Building Code of the International Code Council with necessary California amendments.
CEBC § 1.2 Medium relevance — show source text
1.2_|X|||||||||||||||||||||||| |401.2|||X|||||||||||||||||||||| |401.3|X|||||||||||||||||||||||| |402|||X|||||||||||||||||||||| |402.2||||X|X|||||||||||||||||||| |402.3||||X|X|||||||||||||||||||| |403|||X|||||||||||||||||||||| |404|||X|||||||||||||||||||||| |405.2.1 – 405.2.5||||†|†|||||||||||||||||||| |405.2.3.1|||X|||||||||||||||||||||| |405.2.6|X|||||||||||||||||||||||| |406|||X||||||||†|†||†|†|||||||||| |406.1|X|||||||||||||||||||||||| |407.1|X||X|X|X|||||||||||||||||||| |408|||X|||||||||||||||||||||| |408.1|X|X||X|X|||||||||||||||||||| |408.2|X|X||X|X|||||||||||||||||||| |408.3||||†|†||||||||||||||||||||
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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4 REPAIRS
User notes:
About this chapter: Chapter 4 provides requirements for repairs of existing buildings. The provisions define conditions under which repairs may be made using materials and methods like those of the original construction or the extent to which repairs must comply with requirements for new buildings.
SECTION 401—GENERAL
401.1 Scope. R epairs shall comply with the requirements of this chapter. Repairs to historic buildings and structures shall comply with Part 8, Title 24, C.C.R. [OSHPD 1R, 2, 4 & 5] Repairs to historic buildings not adopted by OSHPD. Repairs shall comply with the requirements in the California Building Code, Sections 1224.2, 1225.2, 1226.2, 1227.2 and 1228.2 for functional requirements as applicable.
401.1.1 Bleachers, folding and telescopic seating and grandstands. Repairs to existing bleachers, folding and telescopic seating and grandstands shall comply with ICC 300.
401.1.2 Scope. [BSC] For state-owned buildings, including those owned by the University of California and the California State University and the Judicial Council, the requirements of Sections 405.2.1 and 405.2.3 are replaced by the requirements of Sections 317 through 322.
401.2 Compliance. The work shall not make the building less complying than it was before the repair was undertaken. Work on nondamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to requirements for alterations.
CEBC § 3A-9 Medium relevance — show source text
305A In-Situ Load Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3A-9
306A Accessibility for Existing Buildings . . . . . . . . . . . . . . . .3A-9
307A Smoke Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3A-9
308A Carbon Monoxide Detection . . . . . . . . . . . . . . . . . . . . . .3A-9
309A Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3A-10
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CONTENTS
310A Compliance Alternatives for Services/Systems and Utilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A-10
311A Compliance Alternatives for Means of Egress. . . . . 3A-11
312A Removal of Hospital SPC and Freestanding Buildings from General Acute Care Service. . . 3A-12
313A Earthquake Monitoring Instruments for Existing Buildings . . . . . . . . . . . . . . . . . . . . . . 3A-14
CHAPTER 4 REPAIRS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
401 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
402 Building Elements and Materials . . . . . . . . . . . . . . . . . 4-3
403 Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
404 Means of Egress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
405 Structural . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
406 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
407 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
408 Plumbing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
CEBC § 3.1 Medium relevance — show source text
1| |CBC—10|California Building Code|A202.1| |CBC—13|California Building Code|A202.1| |CBC—16|California Building Code|A202.1| |CBC—19|California Building Code|A202.1| |CBC—22|California Building Code|A202.1| |CBC—25|California Building Code|A102.2, A105.1, A105.4, A202.1,
A203.1, A204.1, A205.1, A205.3,
A205.3.1, A205.4, A301.3, A304.1.1,
A403.1, A405.1, A407.1, A407.2, A407.3| |TMS 402—22|Building Code Requirements and Specification for Masonry Structures|A105.4, Table A108.1(2)| |UBC—97|Uniform Building Code|A202.1|2025 CALIFORNIA EXISTING BUILDING CODE APPENDIX A-53
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APPENDIX A-54 2025 CALIFORNIA EXISTING BUILDING CODE
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CALIFORNIA EXISTING BUILDING CODE – MATRIX ADOPTION TABLE
APPENDIX B
SUPPLEMENTARY ACCESSIBILITY REQUIREMENTS FOR EXISTING BUILDINGS AND FACILITIES
Not adopted by the State of California (May be available for adoption by local ordinance. See Section 1.1.11.)
Adopting Agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC Adopting Agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6 Adopt Entire Chapter Adopt Entire Chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowChapter / Section The state agency does not adopt sections identified with the following symbol: † The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
2025 CALIFORNIA EXISTING BUILDING CODE APPENDIX B-1
CEBC § 2.3. Medium relevance — show source text
TECHNICALLY INFEASIBLE. An alteration of a facility that has little likelihood of being accomplished because the existing structural conditions require the removal or alteration of a load-bearing member that is an essential part of the structural frame, or because other existing physical or site constraints prohibit modification or addition of elements, spaces or features which are in full and strict compliance with the minimum requirements for new construction and which are necessary to provide accessibility.
UNREINFORCED CONCRETE. [OSHPD 1, 1R, 2, 4 & 5] Unreinforced concrete as used in this chapter means plain concrete as defined in ACI 318 Section 2.3.
UNREINFORCED MASONRY. [OSHPD 1, 1R, 2, 4 & 5] Unreinforced masonry as used in this chapter means masonry construction where reinforcements in any direction is less than minimum reinforcement specified in TMS 402 Section 7.3.2.6.
UNSAFE. Buildings, structures or equipment that are unsanitary, or that are deficient due to inadequate means of egress facilities, inadequate light and ventilation, or that constitute a fire hazard, or in which the structure or individual structural members meet the definition of “Dangerous,” or that are otherwise dangerous to human life or the public welfare, or that involve illegal or improper occupancy or inadequate maintenance shall be deemed unsafe. A vacant structure that is not secured against entry shall be deemed unsafe.
[HCD 1 & HCD 2] An unsafe building, as defined in this chapter, shall be considered substandard.
VOLUNTARY STRUCTURAL IMPROVEMENTS (VSIs). [OSHPD 1, 1R, 2, 4 & 5] Voluntary structural improvements are any alterations of existing structural element(s) or addition of new structural elements which are not necessary for vertical or lateral support of other work and is initiated by the applicant primarily for the purpose of increasing the vertical or lateral load-carrying strength or stiffness of an existing building.
WORK AREA. That portion or portions of a building consisting of all reconfigured spaces as indicated on the construction documents. Work area excludes other portions of the building where incidental work entailed by the intended work must be performed and portions of the building where work not initially intended by the owner is specifically required by this code.
2025 CALIFORNIA EXISTING BUILDING CODE 2-7
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
2-8 2025 CALIFORNIA EXISTING BUILDING CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
CALIFORNIA EXISTING BUILDING CODE – MATRIX ADOPTION TABLE
CHAPTER 3 – PROVISIONS FOR ALL COMPLIANCE METHODS
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
CEBC § 2.3.9 Medium relevance — show source text
Σ W d = Total dead load of all the diaphragms at and above the level under consideration, pounds (N).
2025 CALIFORNIA EXISTING BUILDING CODE APPENDIX A-5
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX A—GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING BUILDINGS
SECTION A105—GENERAL REQUIREMENTS
[BS] A105.1 General. The seismic force-resisting system specified in this chapter shall comply with the California Building Code and referenced standards, except as modified herein.
[BS] A105.2 Alterations and repairs. Alterations and repairs required to meet the provisions of this chapter shall comply with applicable structural requirements of the building code unless specifically provided for in this chapter.
[BS] A105.3 Requirements for plans. The following construction information shall be included in the plans required by this chapter:
- Dimensioned floor and roof plans showing existing walls and the size and spacing of floor and roof-framing members and sheathing materials. The plans shall indicate all existing URM walls, and new crosswalls and shear walls, and their materials of construction. The location of these walls and their openings shall be fully dimensioned and drawn to scale on the plans.
- Dimensioned URM wall elevations showing openings, piers, wall classes as defined in Section A106.2.3.9, thickness, heights, wall shear test locations, cracks or damaged portions requiring repairs, the general condition of the mortar joints, and if and where pointing is required. Where the exterior face is veneer, the type of veneer, its thickness and its bonding and/or ties to the structural wall masonry shall be noted.
- The type of interior wall and ceiling materials, and framing.
- The extent and type of existing wall anchorage to floors and roof where used in the design.
- The extent and type of parapet corrections that were previously performed, if any.
- Repair details, if any, of cracked or damaged unreinforced masonry walls required to resist forces specified in this chapter.
- All other plans, sections and details necessary to delineate required retrofit construction.
- The design procedure used shall be stated on both the plans and the permit application.
- Details of the anchor prequalification program required by Section A107.5.3, if used, including location and results of all tests.
- Quality assurance requirements of special inspection for all new construction materials and for retrofit construction including: anchor tests, pointing or repointing of mortar joints, installation of adhesive or mechanical anchors, and other elements as deemed necessary to ensure compliance with this chapter.
[BS] A105.4 Structural observation, testing and inspection. Structural observation, in accordance with Section 1704.6 of the Cali- fornia Building Code, shall be required for all structures in which seismic retrofit is being performed in accordance with this chapter. Structural observation shall include visual observation of work for compliance with the approved construction documents and confirmation of existing conditions assumed during design. Structural testing and inspection for new and existing construction materials shall be in accordance with the building code, except as modified by this chapter. Special inspection as described in Section A105.3, Item 10, shall be provided equivalent to Level 3 as prescribed in TMS 402, Table 3.1(2).
SECTION A106—MATERIALS REQUIREMENTS
CEBC § 2.1 High relevance — show source text
SECTION BO104—REPAIRS
BO104.1 General. Repairs shall comply with the applicable provisions of this code for new construction or as permitted by this appendix.
BO104.2 Materials. Materials used during repairs shall comply with this section.
BO104.2.1 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by this code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided that unsafe conditions are not created. Hazardous materials shall not be used where this code would not permit their use in buildings of similar occupancy, purpose and location.
BO104.2.2 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the building official to be unsafe.
BO104.2.3 Plumbing materials and supplies. The following plumbing materials and supplies shall not be used:
- All-purpose solvent cement, unless listed for the specific application.
- Flexible traps and tailpieces, unless listed for the specific application.
- Solder having more than 0.2-percent lead in the repair of potable water systems.
BO104.3 Water closets. Where any water closet is replaced with a newly manufactured water closet, the replacement water closet shall comply with the requirements of Section P2903.2.
BO104.4 Electrical. Repair or replacement of existing electrical wiring and equipment shall comply with Chapters 34 through 43.
BO104.5 Structural. Repaired structural elements and systems shall comply with Section R102.6.1 and the structural provisions of this appendix.
SECTION BO105—ALTERATIONS
BO105.1 General. Alterations to existing buildings shall comply with the provisions of this code for new construction, except as permitted by Sections BO105.2 through BO105.8. Engineered design in accordance with Section R301.1.3 shall be permitted to meet the requirements of this section. Alterations shall not cause the existing building to become less compliant with the provisions of this code for new construction than the existing building was prior to the work.
BO105.2 Newly constructed elements. Newly constructed elements, components and systems shall comply with the requirements of this code.
Exceptions:
- Added openable windows are not required to comply with the light and ventilation requirements of Section R325.
- Newly installed electrical equipment shall comply with the requirements of Section BO105.5.
BO105.3 Nonconformities. The work shall not increase the extent of noncompliance or create nonconformity to those requirements that did not previously exist.
BO105.4 Structural. Altered structural elements and systems shall comply with Section R102.6.1 and the structural provisions of this appendix.
BO105.4.1 Decreased structural capacity. Where an alteration causes a decrease in capacity in any structural component, that structural component shall be shown to comply or shall be altered to comply with the applicable provisions of Chapters 3, 4, 5, 6 and 8.
BO105.4.2 Increased design loads. Where an alteration causes an increase in loads as described in this section, the existing structural components that support the increased load, including the foundation, shall be shown to comply or shall be altered to comply with the applicable provisions of Chapters 3, 4, 5, 6 and 8. Existing structural components that do not provide support for the increased loads shall not be required to comply with this section.
CEBC § 2.1 High relevance — show source text
BO102.8 Equivalent alternatives. Work performed in accordance with the California Existing Building Code shall be deemed to comply with the provisions of this appendix. These provisions are not intended to prevent the use of any alternative material, alternative design or alternative method of construction not specifically prescribed herein, provided that any alternative has been deemed to be equivalent and its use authorized by the building official.
BO102.9 More restrictive requirements. Buildings or systems in compliance with the requirements of this code for new construction shall not be required to comply with any more restrictive requirement of these provisions.
SECTION BO103—DEFINITIONS
BO103.1 General. The terms used in this appendix, and not provided in Chapter 2, are defined as follows:
DANGEROUS. Any building, structure or portion thereof that meets any of the conditions described below shall be deemed dangerous:
- The building or structure has collapsed, has partially collapsed, has moved off its foundation or lacks the necessary support of the ground.
- There exists a significant risk of collapse, detachment or dislodgement of any portion, member, appurtenance or ornamentation of the building or structure under permanent, routine or frequent loads; under actual loads already in effect; or under snow, wind, rain, flood, earthquake aftershock or other environmental loads when such loads are imminent.
2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BO-3
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
APPENDIX BO — EXISTING BUILDINGS AND STRUCTURES
SECTION BO104—REPAIRS
BO104.1 General. Repairs shall comply with the applicable provisions of this code for new construction or as permitted by this appendix.
BO104.2 Materials. Materials used during repairs shall comply with this section.
BO104.2.1 New and replacement materials. Except as otherwise required or permitted by this code, materials permitted by this code for new construction shall be used. Like materials shall be permitted for repairs and alterations, provided that unsafe conditions are not created. Hazardous materials shall not be used where this code would not permit their use in buildings of similar occupancy, purpose and location.
BO104.2.2 Existing materials. Materials already in use in a building in compliance with requirements or approvals in effect at the time of their erection or installation shall be permitted to remain in use unless determined by the building official to be unsafe.
BO104.2.3 Plumbing materials and supplies. The following plumbing materials and supplies shall not be used:
- All-purpose solvent cement, unless listed for the specific application.
- Flexible traps and tailpieces, unless listed for the specific application.
- Solder having more than 0.2-percent lead in the repair of potable water systems.
BO104.3 Water closets. Where any water closet is replaced with a newly manufactured water closet, the replacement water closet shall comply with the requirements of Section P2903.2.
BO104.4 Electrical. Repair or replacement of existing electrical wiring and equipment shall comply with Chapters 34 through 43.
BO104.5 Structural. Repaired structural elements and systems shall comply with Section R102.6.1 and the structural provisions of this appendix.
SECTION BO105—ALTERATIONS
CEBC § 1.16.2. Medium relevance — show source text
Numbered Document 063927, “Methods and Requirements for Installing Residential Underground Electric Services 0−600 V to Customer-Owned Facilities”
1.16.2. Replacing Electric Facilities with Like-for-Like
Replacing service termination and metering equipment with new equipment of the exact same ampacity (e.g., 100 amps to 100 amps; 1,200 amps to 1,200 amps) and in the exact same location is considered a “like-for-like” replacement and typically is not considered an upgrade.
N OTE : Replacing a main or load breaker in an existing panel is not considered a panel replacement.
The following requirements apply to like-for-like panel replacements.
A. All new meter panels and their locations must meet Greenbook requirements and be approved by PG&E.
B. If the existing electric meter panel is fed from an overhead service and has an isolated cable termination compartment, separate from the meter socket compartment, the new meter panel must also have an isolated
cable termination compartment. For example, see Section 6, Figure 6 6,“ Typical Service Termination Enclosure, Combination Meter Socket
- Panel for a Class 320 Meter (Residential, 120/240 Volt, 226 Amp - ”Through 320 Amp Service), on Page 6-10.
1-21 2022 – 2023
Section 1, General
1.16.2. (continued)
C. If the existing electric meter panel is fed from an overhead service and does not have a cable termination compartment, then the panel may be replaced with a new panel that does not have an isolated cable termination compartment. See Section 6, Figure 6-5, “Combination Meter Socket Load Center,” on Page 6-9, for specific notes and requirements, and an allowed meter panel that does not have an isolated cable termination compartment. This type of panel may be replaced with one that has an isolated termination compartment.
D. If the existing electric meter panel is fed from an underground service, the new meter panel must have an isolated cable termination compartment that is separated from the meter socket compartment. - “ For example, see Section 6, Figure 6 1, Typical Underground Service-Termination Enclosure, Combination Meter-Socket Panel
CEBC § 1-12 Medium relevance — show source text
1.9 Division of the State Architect . . . . . . . . . . . . . . . . . . . . 1-12
1.10 Department of Health Care Access and Information/Office of Statewide Hospital Planning and Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
1.11 Office of the State Fire Marshal . . . . . . . . . . . . . . . . . . . 1-15
1.12 State Librarian. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
1.13 Department of Water Resources . . . . . . . . . . . . . . . . . . 1-20
1.14 California State Lands Commission . . . . . . . . . . . . . . . 1-20
DIVISION II – SCOPE AND ADMINISTRATION . . . . . . . . . . . . . . . . . 1-21
PART 1—SCOPE AND APPLICATION. . . . . . . . . . . . . . . . . . . . . . . 1-21
101 Scope and General Requirements. . . . . . . . . . . . . . . 1-21
102 Applicability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
PART 2—ADMINISTRATION AND ENFORCEMENT . . . . . . . . . . . 1-22
103 Code Compliance Agency . . . . . . . . . . . . . . . . . . . . . . 1-22
104 Duties and Powers of Code Official. . . . . . . . . . . . . . 1-22
105 Permits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
106 Construction Documents . . . . . . . . . . . . . . . . . . . . . . 1-26
107 Temporary Uses, Equipment and Systems. . . . . . . 1-28
108 Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
109 Inspections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
110 Certificate of Occupancy. . . . . . . . . . . . . . . . . . . . . . . 1-30
111 Service Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
112 Means of Appeals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
California Existing Building Code Medium relevance — show source text
; 2′ C.R.S. with 1″ cover on
both top and bottom flanges; 13′1″ span
restrained.|60 psf|2 hrs|||7|1, 3|2| |F/C-6-RC-34|61/4″|61/4″ thick; 43/4″ (5120 psi) concrete core;
1″ T&G board flooring;1/2″ plaster under-
coat; 4″ × 3″ × 10 lbs R.S.J.; 3′ C.R.S. flush
with top surface concrete; 12′ span simply
supported; 2″ × 1′3″ clinker concrete
insert.|100 psf|4 hrs|||7|1, 7|4| |F/C-6-RC-35|61/4″|43/4″ (3600 psi) concrete core; 1″ T&G
board flooring;1/2″ plaster undercoat; 4″ ×
3″ × 10 lbs R.S.J.; 3′ C.R.S. flush with top
surface concrete; 12′ span simply
supported; 2″ × 1′3″ clinker concrete
insert.|100 psf|2 hrs
30 min|||7|1, 5|21/2| |F/C-6-RC-36|61/4″|43/4″ (2800 psi) concrete core; 1″ T&G
board flooring;1/2″ plaster undercoat; 4″ ×
3″ × 10 lbs R.S.J.; 3′ C.R.S. flush with top
surface concrete; 12″ span simply
supported; 2″ × 1′3″ clinker concrete
insert.|80 psf|4 hrs|||7|1, 7|4| |F/C-7-RC-37|7″|(3640 psi) concrete deck;1/4″ reinforce-
ment bars at 6″ pitch with 11/2″ cover;1/4″
reinforcement bars at 5″ pitch perpendic-
ular with 11/2″ cover; 13′1″ span
restrained.|169 psf|6 hrs|||7|1, 14|6| |F/C-7-RC-38|7″|(4060 psi) concrete deck; 4″ × 3″ × 10 lbs
R.S.J.; 2′6″ C.R.S. with 11/2″ cover on both
top and bottom flanges; 4″ × 6″ × 13 SWG
mesh reinforcement 11/2″ from bottom of
slab; 13′1″ span restrained.|175 psf|6 hrs|||7|1, 14|6| |F/C-7-RC-39|71/4″|53/4″ (4010 psi) concrete core; 1″ T&G
board flooring;1/2″ plaster undercoat;
4″ × 3″ × 10 lbs R.S.J.; 2′6″ C.R.S.CEBC § 71.4 Medium relevance — show source text
reinforcement: verti-
cal, four5/8″ rebars; horizontal,3/8″ ties at
7″ pitch; cover: 11/2″.|71.4
tons|2 hrs|||7|2, 7|2| |C-11-RC-20|11″|11″ square columns; gravel concrete (4530
psi); reinforcement: vertical, four5/8″
rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″ with1/2″ plaster.|58.8
tons|2 hrs|||7|2, 3, 9|2| |C-11-RC-21|11″|11″ square columns; gravel concrete (3520
psi); reinforcement: vertical, four5/8″
rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″.|Vari-
able|1 hr
24 min|||7|1, 8|11/4| |C-11-RC-22|11″|11″ square columns; aggregate concrete
(3710 psi); reinforcement: vertical, four5/8″
rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″.|58.8
tons|2 hrs|||7|2, 3,
10|2| |C-11-RC-23|11″|11″ square columns; aggregate concrete
(3190 psi); reinforcement: vertical, four5/8″
rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″.|58.8
tons|2 hrs|||7|2, 3,
10|2| |C-11-RC-24|11″|11″ square columns; aggregate concrete
(4860 psi); reinforcement: vertical, four
5/8″ rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″.|86.1
tons|1 hr
20 min|||7|1|11/3| |C-11-RC-25|11″|11″ square columns; aggregate concrete
(4850 psi); reinforcement: vertical, four 5/8″
rebars; horizontal,3/8″ ties at 7″ pitch;
cover: 11/2″.|58.8
tons|1 hr
59 min|||7|1|13/4| |C-11-RC-26|11″|11″ square columns; aggregate concrete
(3834 psi); reinforcement: vertical, four 5/8″
rebars; horizontal,5/16″ ties at 41/2″ pitch;
cover: 11/2″.|71.4
tons|53 min|||7|1|3/4|For SI: 1 inch = 25.4 mm, 1 pound per square inch = 0.00689 MPa, 1 ton = 8.896 kN.
CEBC § 2.4.2. Medium relevance — show source text
“Gas Services,” Subsection 2.4.2.E., “Panel Replacements and Conduit Connections to Existing Electric Panels, 400 Amps and Less, Within the Gas Clearance Area,” on Page 2-36, for gas meter set clearance requirements from any type of electrical equipment and materials. Also see Figure 2-22, “Clearance Requirements for an Existing Electric Meter/Panel,” also in Section 2.4.2.E.
2022 – 2023 1-20
Section 1, General
1.16.1. Upgrading Electric Facilities
An increase in the ampacity rating (e.g., 100 amps to 125 amps; 1,200 amps to 1,600 amps) of the equipment where PG&E terminates its service is typically defined as an upgrade. The ampacity rating also may be known as the service-entrance capacity. For example, when an applicant replaces an existing electric meter panel, switchboard, or termination enclosure with one that has a greater ampacity rating (i.e., upgrade), the applicant must meet all Greenbook requirements. Typically, this also includes installing new conduit and service conductors.
When a new meter panel is installed in a new location, the existing meter panel may not be used as a junction box to connect to existing load-side wires. The existing meter panel must be removed and covered by a solid, permanent exterior wall.
See the sections titled “Upgraded Panel” in the numbered documents below for conditions when the conduit or cable may not require upgrading, as determined by PG&E.
- [Numbered Document 063927, “Methods and Requirements for](https://www.pge.com/pge_global/common/pdfs/services/building-and-renovation/greenbook-manual-online/063927.pdf)Installing Residential Underground Electric Services 0−600 V to Customer-Owned Facilities”
- [Numbered Document 063928, “Methods and Requirements for](https://www.pge.com/pge_global/common/pdfs/services/building-and-renovation/greenbook-manual-online/063928.pdf)Installing Non-Residential Underground Electric Services 0−600 Volts to Customer-Owned Facilities”
1.16.2. Replacing Electric Facilities with Like-for-Like
Replacing service termination and metering equipment with new equipment of the exact same ampacity (e.g., 100 amps to 100 amps; 1,200 amps to 1,200 amps) and in the exact same location is considered a “like-for-like” replacement and typically is not considered an upgrade.
N OTE : Replacing a main or load breaker in an existing panel is not considered a panel replacement.
The following requirements apply to like-for-like panel replacements.
A. All new meter panels and their locations must meet Greenbook requirements and be approved by PG&E.
California Existing Building Code Medium relevance — show source text
3/8″
main reinforcement bars at 57/8″ pitch
with7/8″ concrete cover;3/8″ main rein-
forcement bars at 41/2″ pitch
perpendicular with1/2″ concrete cover;
13′1″ span restrained.|195 psf|4 hrs|||7|1, 7|4| |F/C-4-RC-7|4″|4″ (5025 psi) concrete deck;1/4″ reinforce-
ment bars at 71/2″ pitch with3/4″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 2|11/4| |F/C-4-RC-8|4″|4″ thick (4905 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|100 psf|1 hr
23 min|||7|1, 2|11/3| |F/C-4-RC-9|4″|4″ deep (4370 psi);1/4″ reinforcement bars
at 6″ pitch with3/4″ cover;1/4″ main rein-
forcement bars at 4″ pitch perpendicular
with1/2″ cover; 13′1″ span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-10|4″|4″ thick (5140 psi) deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 33/4″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|140 psf|1 hr
16 min|||7|1, 5|11/4| |F/C-4-RC-11|4″|4″ thick (4000 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.; flush
with top surface; 4″ × 6″ x 13 SWG mesh
reinforcement 1″ from bottom of slab; 6′6″
span restrained.|150 psf|2 hrs|||7|1, 3|2| |F/C-4-RC-12|4″|4″ deep (2380 psi) concrete deck;
3″ × 11/2″ × 4 lbs R.S.J.; 2′6″ C.R.S.
Frequently asked questions
Can I always replace one old pipe with “the same” pipe without permitting the work?
No. If the work is a simple repair and the replacement pipe is like‑for‑like and does not create an unsafe condition, like materials are permitted under § 302.4 / § 402.3. If the replacement changes system capacity, routing, creates a hazard, or involves prohibited materials, then new‑construction rules apply and permitting/inspection per the relevant code (plumbing/electrical/mechanical) is required.
Who decides if a “like” repair is unsafe?
The code official (building official/inspector) has the authority to determine that existing or replacement materials are unsafe and require removal or upgrade per § 302.3 and § 302.4. Document your basis (photos, material specs) when applying for permits or inspections.
If I replace a broken window in a hazardous location, can I use the same glass?
Replacement glazing in hazardous locations must meet the safety glazing requirements of the CBC or CRC unless a listed exception applies (for example, glass block or jalousies repaired with like materials). See § 402.1 and § 402.3.
Do “historic” buildings get special treatment for original materials?
Chapter 4 and the CEBC provide for repairs to historic buildings; however, historic repair rules can interact with Part 8 Title 24 and agency adoption (OSHPD/HCD). Always check the CEBC historic building guidance and local adoption rules. See Chapter 4 scope and the note about historic buildings.
If a repair uncovers more damage and I need to replace structural elements, what then?
If new structural members are required, those elements must comply with the CBC detailing provisions for new buildings of similar structure, purpose and location per § 302.4.1; that escalates the work beyond simple “like” repairs.
More in California Existing Building Code
- Administration and Definitions (Scope, enforcement, code official duties, definitions)
- Provisions for All Compliance Methods (general requirements that apply to all compliance options; Chapter 3 / 3A)
- Seismic retrofit and evaluation (Appendix A and seismic provisions/sections for evaluation and retrofit)
- Referenced Standards and Appendices (Chapter 16 and Appendices A–E, Resource A)
- Repairs (Chapter 4 — repair-specific rules for materials, means of egress, structural, MEP, etc.)
- Alterations — Level 1, Level 2, Level 3 (technical requirements for each alteration level; Chapters 7–9)
- Change of Occupancy and Additions (requirements for occupancy changes and additions; Chapters 10–11)
- Compliance Methods — Prescriptive, Work Area, Performance (Chapters 5, 6–11, 13)
- Relocated Buildings (requirements for buildings moved or relocated; Chapter 14)
- Construction Safeguards (site safety, means of egress and life-safety during construction; Chapter 15)
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