CHBC · California Historical Building Code
Receptacle spacing waivers and outlet modifications
The CHBC allows the local enforcing agency to waive or modify required receptacle spacing if strict compliance would be impracticable for a historic building (see § 8-904.2.5). You must document why compliance harms historic fabric, propose a safety-equivalent alternative, and follow CHBC wiring rules for grounding and GFCI where those still apply.
Last reviewed: July 6, 2026
What the code requires
The California Historical Building Code lets the enforcing authority waive or modify receptacle outlet spacing and related distance requirements when compliance is impracticable for a qualified historical building. The controlling provision is § 8-904.2.5.
When strict compliance with regular electrical spacing rules would harm historic fabric or be impracticable, the enforcing agency may allow a waiver or modify the spacing requirements.
Requirements in detail
High-level rule (what the CHBC says)
- The enforcing agency may waive or modify receptacle outlet spacing and other related distance requirements when it determines compliance is impracticable. See § 8-904.2.5.
- That waiver authority sits alongside CHBC provisions that let the enforcing agency accept alternatives or preserve archaic methods when they do not create a safety hazard (see § 8-904.1.3 and § 8-904.1.4).
Key defined terms and roles (first mention bolded)
- Enforcing agency — the local authority having jurisdiction that reviews and approves waivers or modifications.
- Impracticable — a factual determination made by the enforcing agency; the CHBC text does not supply a numeric test or exhaustive definition in § 8-904.2.5. If a definition is needed, the enforcing agency’s interpretation and its documentation control.
- Receptacle outlet — electrical convenience outlet; CHBC defers to the regular electrical code for technical definitions and numeric spacing rules unless waived.
Decision-relevant checklist (what the enforcing agency will typically consider)
- Is strict compliance physically or materially destructive to historic fabric (e.g., damaging original plaster, millwork, historic trim, or finishes)?
- Are reasonable alternative solutions available that provide comparable functionality and safety (for example, surface-mounted historic-style raceways, consolidated outlets, or alternate locations that preserve character)?
- Do alternatives achieve an equivalent level of electrical safety (grounding/GFCI, connection to grounding electrode system where practicable)? See related wiring provisions § 8-904.2.1 – § 8-904.2.4 for grounding and GFCI limits.
- Is the waiver or modification documented in the project file, including the rationale and any conditions the enforcing agency imposes (e.g., required GFCI protection, labels, or future retrofit requirement)?
Decision-relevant values and references
| Issue / dimension | Typical decision point | What to provide to the enforcing agency | Code Reference |
|---|---|---|---|
| Authority to waive spacing | Whether compliance is impracticable | Narrative and photographs showing damage or infeasibility; proposed alternative | § 8-904.2.5 |
| Acceptance of alternatives | Equivalent safety vs. strict compliance | Engineering or safety rationale for the alternative | § 8-904.1.3 |
| Retention of archaic methods | Whether an archaic method constitutes a safety hazard | Description of existing method and justification for retention/extension | § 8-904.1.4 |
| Grounding / nongrounding outlets | When grounding conductor impracticable | Use of nongrounding receptacles or GFCI protection as allowed | § 8-904.2.1, § 8-904.2.2, § 8-904.2.3 |
| Extensions without equipment grounding | Conditions for supplying grounding-type devices on extensions | New extension’s equipment grounding conductor must be grounded to accessible point on grounding electrode system | § 8-904.2.4 |
Note: The CHBC statement in § 8-904.2.5 is procedural (waiver/modify if impracticable) rather than numeric — the CHBC intentionally defers numeric spacing dimensions to the regular codes unless a waiver is granted.
How waivers typically interact with other electrical requirements
- Waiver of spacing is not an automatic removal of safety requirements. If the regular code requires GFCI protection or grounding when replacing an outlet, the CHBC still addresses grounding/GFCI exceptions and alternatives (see § 8-904.2.1–§ 8-904.2.4).
- The enforcing agency may require that alternate solutions achieve “equivalent safety,” per § 8-904.1.3. Documentation of equivalent safety is typically required.
Exceptions & special cases
- Where existing branch circuits have no equipment grounding conductor and connecting one is impracticable, receptacle convenience outlets may remain the nongrounding type (see § 8-904.2.1). This is a specific CHBC allowance distinct from the spacing waiver.
- When replacing receptacles where the regular code would require GFCI protection, the CHBC requires installation of GFCI-protected receptacles on replacements (see § 8-904.2.2). The CHBC also addresses grounding of metallic faceplates in these situations.
- Grounding-type receptacles shall not be used without a grounding means unless they are GFCI protected; existing nongrounding receptacles may be replaced with nongrounding or grounding-type receptacles when supplied through a GFCI (see § 8-904.2.3).
- Extensions of existing circuits without grounding conductors may supply grounding-type devices only when the new extension’s grounding conductor is properly connected to the grounding electrode system (see § 8-904.2.4).
If your project triggers accessibility or other agency-specific rules (ADA, local accessible design standards), the CHBC indicates that documentation and coordinating opinions may be required; those processes are handled in other CHBC sections and by the enforcing agency. The CHBC text we retrieved does not fully lay out procedural templates for waiver documentation — check with your local enforcing agency for their submittal requirements.
Common mistakes
- Assuming a waiver is automatic: CHBC allows waiver only when the enforcing agency determines compliance is impracticable — you must get approval. See § 8-904.2.5.
- Failing to document impracticability: reviewers expect photos, measured drawings, and a clear statement of why standard routing or outlet placement would damage historic materials. The CHBC requires agency determination but not a specific form; follow local submittal rules.
- Ignoring grounding/GFCI rules: waiving spacing does not automatically waive grounding or GFCI protections required under other CHBC wiring provisions (see § 8-904.2.1–§ 8-904.2.4).
- Proposing alternatives without an equivalency argument: the enforcing agency may accept alternatives only if they “achieve equivalent safety” per § 8-904.1.3. Provide a safety rationale.
Worked example (process-focused, CHBC-grounded)
Scenario: A 1910 historic parlor has original plaster walls and decorative moldings. The regular electrical code would require additional wall receptacles to meet modern spacing, but cutting channels and installing new in-wall boxes would destroy historic fabric.
Step 1 — Document the condition
- Take photos of plaster and moldings, document existing receptacle locations and wall construction, and explain why in-wall work would be destructive.
Step 2 — Propose alternatives
- Propose consolidating power needs at an existing location, using historically sympathetic surface-mounted raceway or baseboard-mounted outlets, or adding a single discreet outlet in a less-significant area. Include how the alternative will meet occupant needs.
Step 3 — Address safety and grounding
- Explain how safety is preserved: e.g., provide GFCI protection where required; if adding an extension, show how the grounding conductor will be bonded (refer to § 8-904.2.2 and § 8-904.2.4).
Step 4 — Submit to enforcing agency
- Submit the documentation and proposed alternative with a request for waiver or modification under § 8-904.2.5, citing the impracticability and the measures taken to achieve equivalent safety (per § 8-904.1.3).
Outcome (example of likely agency actions)
- The enforcing agency may approve the proposed surface-mounted solution subject to conditions (e.g., GFCI protection, labeling, or a requirement to retrofit to full compliance if/when larger alterations occur). The approval is an application of § 8-904.2.5 and § 8-904.1.3.
Note: numeric spacing requirements from the regular electrical code are not reproduced in the CHBC text we retrieved; the CHBC provides waiver authority rather than new numeric spacing values. For the exact numeric spacing you must consult the California Electrical Code (regular code) and then seek a waiver under § 8-904.2.5 if needed.
Related provisions (CHBC)
- § 8-901.1 — Purpose/intent of CHBC (scope for mechanical/plumbing/electrical)
- § 8-904.1.3 — Authority to approve alternatives that achieve equivalent safety
- § 8-904.1.4 — Archaic methods may remain or be extended if not unsafe
- § 8-904.2.1 — Nongrounding receptacles may remain when grounding conductor impracticable
- § 8-904.2.2 — GFCI requirements for replacements and grounding of metallic faceplates
- § 8-904.2.3 — Conditions for replacing nongrounding receptacles with grounding or nongrounding types (GFCI conditions)
- § 8-904.2.4 — Extensions of circuits without equipment grounding conductors and grounding requirements for new extensions
Code references
Grounded in the retrieved California Historical Building Code — click a citation to read the verbatim passage:
CHBC § 8-904.1.3 High relevance — show source text
8-904.1.3 The enforcing agency may approve any alternative to the CHBC which achieves equivalent safety.
8-904.1.4 Archaic methods that do not appear in present codes may remain and may be extended if, in the opinion of the enforcing agency, they constitute a safe installation.
8-904.2 Wiring methods.
8-904.2.1 Where existing branch circuits do not include an equipment grounding conductor and, in the opinion of the enforcing agency, it is impracticable to connect an equipment grounding conductor to the grounding electrode system, receptacle convenience outlets may remain the nongrounding type.
8-904.2.2 Ground fault circuit interrupter (GFCI) protected receptacles shall be installed where replacements are made at receptacle outlets that are required to be so protected by the regular code in effect at the time of replacement. Metallic face plates shall either be grounded to the grounded metal outlet box or be grounded to the grounding-type device when used with devices supplied by branch circuits without equipment grounding conductors.
8-904.2.3 Grounding-type receptacles shall not be used without a grounding means in an existing receptacle outlet unless GFCI protected. Existing nongrounding receptacles shall be permitted to be replaced with nongrounding or grounding-type receptacles where supplied through a ground fault circuit interrupter.
8-904.2.4 Extensions of existing branch circuits without equipment-grounding conductors shall be permitted to supply grounding-type devices only when the equipment grounding conductor of the new extension is grounded to any accessible point on the grounding electrode system.
8-904.2.5 Receptacle outlet spacing and other related distance requirements shall be waived or modified if determined to be impracticable by the enforcing agency.
8-904.2.6 For the replacement of lighting fixtures on an existing nongrounding lighting outlet, or when extending an existing nongrounding lighting outlet, the following shall apply:
- The exposed conductive parts of lighting fixtures shall be connected to any acceptable point on the grounding electrode system, or
- The lighting fixtures shall be made of insulating material and shall have no exposed conductive parts. Exception: Lighting fixtures mounted on electrically nonconductive ceilings or walls where located not less than either 8 feet (2438 mm) vertically or 5 feet (1524 mm) horizontally from grounded surfaces.
8-904.2.7 Lighting load calculations for services and feeders may be based on actual loads as installed in lieu of the “watts per square foot” method.
8-904.2.8 Determination of existing loads may be based on maximum demand recordings in lieu of calculations, provided all of the following are met:
- Recordings are provided by the serving agency.
- The maximum demand data is available for a one-year period. Exception: If maximum demand data for a one-year period is not available, the maximum demand data shall be permitted to be based on the actual amperes continuously recorded over a minimum 30-day period by a recording ammeter connected to the highest loaded phase of the feeder or service. The recording should reflect the maximum demand when the building or space is occupied and include the measured or calculated load at the peak time of the year, including the larger of the heating or cooling equipment load.
- There has been no change in occupancy or character of load during the previous 12 months.
- The anticipated load will not change, or the existing demand load at 125 percent plus the new load does not exceed the ampacity of the feeder or rating of the service.
CHBC § 8-903.9 High relevance — show source text
8-903.9 Building sewers and private sewage disposal systems. New building sewers and new private sewage disposal systems shall comply with applicable requirements of the regular code.
20 2025 CALIFORNIA HISTORICAL BUILDING CODE
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MECHANICAL, PLUMBING AND ELECTRICAL REQUIREMENTS
8-903.10 Fuel-gas piping. Fuel-gas piping shall comply with the regular code requirements except that the enforcing agency shall accept solutions which do not increase the safety hazard.
SECTION 8-904 — ELECTRICAL
8-904.1 General. Electrical systems shall comply with the regular code unless otherwise permitted by this code, or approved by the authority having jurisdiction.
8-904.1.1 The provisions of the CHBC shall apply to the acceptance, location, installation, alteration, repair, relocation, replacement or addition of any electrical system or portion thereof, the premise wiring, or equipment fixed in place as related to restoration within or attached to a qualified historical building or property.
8-904.1.2 Existing systems, wiring methods and electrical equipment which do not, in the opinion of the enforcing agency, constitute a safety hazard may remain in use.
8-904.1.3 The enforcing agency may approve any alternative to the CHBC which achieves equivalent safety.
8-904.1.4 Archaic methods that do not appear in present codes may remain and may be extended if, in the opinion of the enforcing agency, they constitute a safe installation.
8-904.2 Wiring methods.
8-904.2.1 Where existing branch circuits do not include an equipment grounding conductor and, in the opinion of the enforcing agency, it is impracticable to connect an equipment grounding conductor to the grounding electrode system, receptacle convenience outlets may remain the nongrounding type.
8-904.2.2 Ground fault circuit interrupter (GFCI) protected receptacles shall be installed where replacements are made at receptacle outlets that are required to be so protected by the regular code in effect at the time of replacement. Metallic face plates shall either be grounded to the grounded metal outlet box or be grounded to the grounding-type device when used with devices supplied by branch circuits without equipment grounding conductors.
8-904.2.3 Grounding-type receptacles shall not be used without a grounding means in an existing receptacle outlet unless GFCI protected. Existing nongrounding receptacles shall be permitted to be replaced with nongrounding or grounding-type receptacles where supplied through a ground fault circuit interrupter.
8-904.2.4 Extensions of existing branch circuits without equipment-grounding conductors shall be permitted to supply grounding-type devices only when the equipment grounding conductor of the new extension is grounded to any accessible point on the grounding electrode system.
8-904.2.5 Receptacle outlet spacing and other related distance requirements shall be waived or modified if determined to be impracticable by the enforcing agency.
CHBC § 1136A.1 High relevance — show source text
1136A.1 Receptacle heights. Electrical receptacle outlets on branch circuits of 30 amperes or less and communication system recepta- cles shall be located no more than 48 inches (1219 mm) measured from the top of the receptacle outlet box nor less than 15 inches (381 mm) measured from the bottom of the receptacle outlet box to the level of the finished floor or working platform. If the reach is over a physical barrier or an obstruction (for example, a kitchen base cabinet), receptacles shall be located within the reach ranges specified in Section 1138A.3. Physical barriers and obstructions shall not extend more than 25 inches (635 mm) from the wall beneath the receptacle.
Cabinets shall be allowed to extend 24 inches from the wall beneath a control or switch with an additional countertop extension of 1 [1] / 2 inches for a maximum dimension of 25 [ 1] / 2 i nches (647.7 mm) in depth.
Receptacle outlets that do not satisfy these specifications are acceptable provided that comparable receptacle outlets, that perform the same functions, are provided within the same area and are accessible.
Exceptions: 1. Receptacle outlets installed as part of permanently installed baseboard heaters are exempt. 2. Required receptacle outlets shall be permitted in floors when adjacent to sliding panels or walls. 3. Baseboard electrical outlets used in relocatable partitions, window walls or other electrical convenience floor outlets are not subject to the minimum height requirements. 4. This section shall not apply to existing buildings when the enforcing agency determines that compliance with these stan- dards would create an unreasonable hardship.
1136A.2 Switch and control heights. Controls or switches intended to be used by the occupant of the room or area to control lighting and receptacle outlets, appliances, alarms or cooling, heating and ventilating equipment shall be located no more than 48 inches (1219 mm) measured from the top of the outlet box nor less than 15 inches (381 mm) measured from the bottom of the outlet box to the level of the finished floor or working platform. If the reach is over a physical barrier or an obstruction (for example, a kitchen base cabinet) switches and controls shall be located within the reach ranges specified in Section 1138A.3. Physical barriers or obstructions shall not extend more than 25 inches (635 mm) from the wall beneath a control or switch.
Cabinets shall be allowed to extend 24 inches from the wall beneath a control or switch with an additional countertop extension of 1 [1] / 2 inches for a maximum dimension of 25 [ 1] / 2 inches (647.7 mm) in depth.
Switches and controls that do not satisfy these specifications are acceptable provided that comparable controls or outlets, that perform the same functions, are provided within the same area and are accessible.
Exception: Appliances (e.g., kitchen stoves, dishwashers, range hoods, microwave ovens and similar appliances) which have controls located on the appliance.
2025 CALIFORNIA BUILDING CODE 11A-37
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HOUSING ACCESSIBILITY
DIVISION V – FEATURES COMMON TO EXTERIOR AND INTERIOR OF BUILDINGS
DIVISION V Table of Contents
CHBC § 5.4.7 High relevance — show source text
Where the bar used is Grade 60 and the size specified in the table, the actual spacing in the wall shall not exceed a whole-
number multiple of 12 inches such as, 12, 24, 36 and 48, that is less than or equal to the tabulated spacing. Vertical reinforcement with a yield strength of less than 60,000 psi
or bars of a different size than specified in the table are permitted in accordance with Section R608.5.4.7 and Table R608.5.4(2).
h. See Table R608.3 for minimum core dimensions and maximum spacing of horizontal and vertical cores.
i. “Top” means gravity load from roof or floor construction bears on top of wall. “Side” means gravity load from floor construction is transferred to wall from a wood ledger or
cold-formed steel track bolted to side of wall. For nonload-bearing wall and where floor framing members span parallel to the wall, use of the “Top” bearing condition is
permitted.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound per square inch = 6.895 kPa, 1 square foot = 0.0929 m2.
a. Table is based on ASCE 7 components and cladding wind pressures for an enclosed building using a mean roof height of 35 feet, interior wall area 4, an effective wind area of
10 square feet, topographic factor,Kzt, equal to 1.0, and Risk Category II.
b. Table is based on concrete with a minimum specified compressive strength of 2,500 psi.
c. See Section R608.6.5 for location of reinforcement in wall.
d. Deflection criterion is_L_/240, where_L_ is the unsupported height of the wall in inches.
e. Interpolation is not permitted.
f. Where No. 4 reinforcing bars at a spacing of 48 inches are specified in the table as indicated by shaded cells, use of bars with a minimum yield strength of 40,000 psi or 60,000
psi is permitted.
g. Other than for No. 4 bars spaced at 48 inches on center, table values are based on reinforcing bars with a minimum yield strength of 60,000 psi. Maximum spacings shown are
the values calculated for the specified bar size. Where the bar used is Grade 60 and the size specified in the table, the actual spacing in the wall shall not exceed a whole-
number multiple of 12 inches such as, 12, 24, 36 and 48, that is less than or equal to the tabulated spacing. Vertical reinforcement with a yield strength of less than 60,000 psi
or bars of a different size than specified in the table are permitted in accordance with Section R608.5.4.7 and Table R608.5.4(2).
h. See Table R608.3 for minimum core dimensions and maximum spacing of horizontal and vertical cores.
i. “Top” means gravity load from roof or floor construction bears on top of wall. “Side” means gravity load from floor construction is transferred to wall from a wood ledger or
cold-formed steel track bolted to side of wall. For nonload-bearing wall and where floor framing members span parallel to the wall, use of the “Top” bearing condition is
permitted.|2025 CALIFORNIA RESIDENTIAL CODE 6-121
CHBC § 1215.5 High relevance — show source text
(6) Size each section of branch piping not previously sized by measuring the distance from the gas meter location to the most remote outlet in that branch and follow the procedures of steps 2, 3, 4, and 5 above. Size branch piping in the order of their distance from the meter location, beginning with the most distant outlet not previously sized.
1215.5 Engineering Methods. For conditions other than those covered by Section 1215.1, such as longer runs or greater gas demands, the size of each gas piping system shall be determined by standard engineering methods acceptable to the Authority Having Jurisdiction, and each such system shall be so designed that the total pressure drop between the meter or another point of supply and an outlet where full demand is being supplied to all outlets, shall be in accordance with the requirements of Section 1208.4. 1215.6 Variable Gas Pressure. Where the supply gas pressure exceeds 5 psi (34.6 kPa) for natural gas and 10 psi (69 kPa) for undiluted propane or is less than 6 inches (1.5 kPa) of water column, or where diversity demand factors are used, the design, pipe, sizing, materials, location, and use of such systems first shall be approved by the Authority Having Jurisdiction. Piping systems designed for pressures exceeding the serving gas supplier’s standard delivery pressure shall have prior verification from the gas supplier of the availability of the design pressure.
2025 CALIFORNIA PLUMBING CODE 235
), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
FUEL GAS PIPING
FIGURE 1215.1.1
EXAMPLE ILLUSTRATING USE OF TABLE 1208.3.1 AND TABLE 1215.2(1)
Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 1215.1.1. Gas to be used has a specific gravity of 0.60 and 1100 British thermal units (Btu) per cubic foot (0.0114 kW•h/L), delivered at 8 inch water column (2.0 kPa) pressure.
For SI units: 1 foot = 304.8 mm, 1 gallon = 3.785 L, 1000 British thermal units per hour = 0.293 kW, 1 cubic foot per hour = 0.0283 m [3] /h
Solution:
(1) Maximum gas demand of Outlet A — 32 cubic feet per hour (0.91 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet B — 3 cubic feet per hour (0.08 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet C — 59 cubic feet per hour (1.67 m [3] /h) (from Table 1208.3.1).
Maximum gas demand of Outlet D — 136 cubic feet per hour (3.85 m [3] /h) [150 000 Btu/hour (44 kW) divided by 1100 Btu per cubic foot (0.0114 kW•h/L)].
(2) The length of pipe from the gas meter to the most remote outlet (Outlet A) is 60 feet (18 288 mm).
CHBC § 22.2 Medium relevance — show source text
6. Plumbing protection. Water supply and drain pipes under lavatories shall be insulated or otherwise covered to protect against contact. There shall be no sharp or abrasive surfaces under lavatories.
7. Lavatory faucet controls. Faucet controls and operation mechanisms shall be operable with one hand and shall not require tight grasping, pinching or twisting of the wrist. The force required to activate controls shall be no greater than 5 pounds (22.2 N). Lever operated, push-type and electroni- cally controlled mechanisms are examples of acceptable designs. Self-closing valves are allowed if the faucet remains open for at least 10 seconds.
8. Mirrors and towel fixtures. Where mirrors or towel fixtures are provided they shall be mounted with the bottom edge no higher than 40 inches (1016 mm) from the floor.
SECTION 1135A —LAUNDRY ROOMS
1135A.1 General. If clothes washing machines and clothes dryers are provided in covered multifamily dwelling units, one of each type of appliance shall be provided. Where front-loading clothes washers are not provided, management shall provide assistive devices, on request of the occupant, to permit the use of top-loading clothes washers.
11A-36 2025 CALIFORNIA BUILDING CODE
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HOUSING ACCESSIBILITY
SECTION 1136A —ELECTRICAL RECEPTACLE, SWITCH AND CONTROL HEIGHTS
1136A.1 Receptacle heights. Electrical receptacle outlets on branch circuits of 30 amperes or less and communication system recepta- cles shall be located no more than 48 inches (1219 mm) measured from the top of the receptacle outlet box nor less than 15 inches (381 mm) measured from the bottom of the receptacle outlet box to the level of the finished floor or working platform. If the reach is over a physical barrier or an obstruction (for example, a kitchen base cabinet), receptacles shall be located within the reach ranges specified in Section 1138A.3. Physical barriers and obstructions shall not extend more than 25 inches (635 mm) from the wall beneath the receptacle.
Cabinets shall be allowed to extend 24 inches from the wall beneath a control or switch with an additional countertop extension of 1 [1] / 2 inches for a maximum dimension of 25 [ 1] / 2 i nches (647.7 mm) in depth.
Receptacle outlets that do not satisfy these specifications are acceptable provided that comparable receptacle outlets, that perform the same functions, are provided within the same area and are accessible.
Exceptions: 1. Receptacle outlets installed as part of permanently installed baseboard heaters are exempt. 2. Required receptacle outlets shall be permitted in floors when adjacent to sliding panels or walls. 3. Baseboard electrical outlets used in relocatable partitions, window walls or other electrical convenience floor outlets are not subject to the minimum height requirements. 4. This section shall not apply to existing buildings when the enforcing agency determines that compliance with these stan- dards would create an unreasonable hardship.
CHBC § 0.63 Medium relevance — show source text
For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
g. For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c. Framing at adjoining panel edges shall be 3 inches nominal or wider.
d. Staples shall have a minimum crown width of7/16 inch and shall be installed with their crowns parallel to the long dimension of the framing members.
e. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
f. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
g. For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c. Framing at adjoining panel edges shall be 3 inches nominal or wider.
d. Staples shall have a minimum crown width of7/16 inch and shall be installed with their crowns parallel to the long dimension of the framing members.
e. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
f. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
g. For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c.CHBC § 2306.2 Medium relevance — show source text
For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c. Framing at adjoining panel edges shall be 3 inches nominal or wider.
d. Staples shall have a minimum crown width of7/16 inch and shall be installed with their crowns parallel to the long dimension of the framing members.
e. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
f. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
g. For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c. Framing at adjoining panel edges shall be 3 inches nominal or wider.
d. Staples shall have a minimum crown width of7/16 inch and shall be installed with their crowns parallel to the long dimension of the framing members.
e. The minimum nominal width of framing members not located at boundaries or adjoining panel edges shall be 2 inches.
f. For shear loads of normal or permanent load duration as defined by the ANSI/AWC NDS, the values in the table shall be multiplied by 0.63 or 0.56, respectively.
g. For Case 1 through 6 descriptions see Figure 2306.2(1).|For SI: 1 inch = 25.4 mm, 1 pound per foot = 14.5939 N/m.
a. For framing of other species: (1) Find specific gravity for species of lumber in ANSI/AWC NDS. (2) For staples find shear value from table for Structural I panels (regardless of
actual grade) and multiply value by 0.82 for species with specific gravity of 0.42 or greater, or 0.65 for all other species.
b. Space fasteners maximum 12 inches on center along intermediate framing members (6 inches on center where supports are spaced 48 inches on center).
c. Framing at adjoining panel edges shall be 3 inches nominal or wider.
d.CHBC § 8-8 Medium relevance — show source text
CHAPTER 8-8 ARCHAIC MATERIALS AND METHODS OF
CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . 15
Section
8-801 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . 15 8-802 General Engineering Approaches. . . . . . . . . . . . . . . . . 15 8-803 Nonstructural Archaic Materials. . . . . . . . . . . . . . . . . . 15
8-804 Allowable Conditions for Specific Materials . . . . . . . 15 8-805 Masonry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8-806 Adobe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8-807 Wood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8-808 Concrete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8-809 Steel and Iron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8-810 Hollow Clay Tile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8-811 Veneers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8-812 Glass and Glazing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CHAPTER 8-9 MECHANICAL, PLUMBING AND ELECTRICAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . 19
Section
8-901 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . 19 8-902 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8-903 Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8-904 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CHAPTER 8-10 QUALIFIED HISTORICAL DISTRICTS,
SITES AND OPEN SPACES . . . . . . . . . . . . . . . 23
Section
CHBC § 1310.9 Medium relevance — show source text
1310.9 Drips and Sediment Traps. For other than dry gas conditions, a drip shall be provided at any point in the line of pipe where condensate could collect. Where required by the Authority Having Jurisdiction or the serving gas supplier, a drip shall also be provided at the outlet of the meter. This drip shall be installed so as to constitute a trap wherein an accumulation of condensate shuts off the flow of gas before it runs back into the meter. [NFPA 54:7.6.1]
1310.9.1 Location of Drips. All drips shall be installed only in such locations that they are readily accessible to permit cleaning or emptying. A drip shall not be located where the condensate is likely to freeze.
[NFPA 54:7.6.2]
1310.9.2 Sediment Traps. The installation of sediment traps shall be in accordance with Section 1312.9.
[NFPA 54:7.6.3]
1310.10 Outlets. Outlets shall be located and installed in accordance with the following requirements:
(1) The outlet fittings or piping shall be securely fastened in place.
(2) Outlets shall not be located behind doors.
(3) Outlets shall be located far enough from floors, walls, patios, slabs, and ceilings to permit the use of wrenches without straining, bending, or damaging the piping.
(4) The unthreaded portion of gas piping outlets shall extend not less than 1 inch (25.4 mm) through finished ceilings or indoor or outdoor walls.
(5) The unthreaded portion of gas piping outlets shall extend not less than 2 inches (51 mm) above the surface of floors or outdoor patios or slabs.
(6) The provisions of Section 1310.10(4) and Section 1310.10(5) shall not apply to listed quick-disconnect devices of the flush-mounted type or listed gas convenience outlets. Such devices shall be installed in accor dance with the manufacturer’s installation instructions.
[NFPA 54:7.7.1.1 – 7.7.1.6] 1310.10.1 Cap Outlets. Each outlet, including a valve, shall be closed gastight with a threaded plug or cap immediately after installation and shall be left closed until the appliance or equipment is connected thereto. When an appliance or equipment is disconnected from an outlet and the outlet is not to be used again immediately, it shall be capped or plugged gastight.
Exceptions:
(1) Laboratory appliances installed in accordance with Section 1312.3.1 shall be permitted.
(2) The use of a listed quick-disconnect device with integral shutoff or listed gas convenience outlet shall be permitted. [NFPA 54:7.7.2.1] 1310.10.1.1 Appliance Shutoff Valves. Appliance shutoff valves installed in fireplaces shall be removed and the piping capped gastight where the fireplace is used for solid fuel burning. [NFPA 54:7.7.2.2] 1310.11 Manual Gas Shutoff Valves. An accessible gas shutoff valve shall be provided upstream of each gas pressure regulator. Where two gas pressure regulators are installed in series in a single gas line, a manual valve shall not be required at the second regulator.
CHBC § 8-602.2 Medium relevance — show source text
Such documentation shall be in accordance
with Section 8-602.2, Item 2, and shall include the opinion and comments of state or
local accessibility officials, and the opinion and comments of representative local
groups of people with disabilities. Such documentation shall be retained in the
permanent file of the enforcing agency. Copies of the required documentation should
be available at the facility upon request.
** Note:**For commercial facilities and places of public accommodation
(Title III entities).
Equivalent facilitation for an element of a building or property when applied as a waiver
of an ADA accessibility requirement will not be entitled to the Federal Department of
Justice certification of this code as rebuttable evidence of compliance for that element.|Applies|Waivers
If a builder
applies for a
waiver of an ADA
accessibility
requirement for
an element of a
building, he or
she will not be
entitled to
certification’s
rebuttable
evidence of
compliance for
that element. This
limitation on the
certification
determination
should be noted
in any publication
of Chapter 8-6 if
certification is
granted.|Applies| |**Notes:**The regular code for Chapter 8-6 is contained in Title 24, Part 2, Vol.1, Chapter 11B, which contain standards for new construction.
Provisions of this chapter may be used in conjunction with all other provisions of the regular code and ADA regulations.|**Notes:**The regular code for Chapter 8-6 is contained in Title 24, Part 2, Vol.1, Chapter 11B, which contain standards for new construction.
Provisions of this chapter may be used in conjunction with all other provisions of the regular code and ADA regulations.|**Notes:**The regular code for Chapter 8-6 is contained in Title 24, Part 2, Vol.1, Chapter 11B, which contain standards for new construction.
Provisions of this chapter may be used in conjunction with all other provisions of the regular code and ADA regulations.|**Notes:**The regular code for Chapter 8-6 is contained in Title 24, Part 2, Vol.1, Chapter 11B, which contain standards for new construction.
Provisions of this chapter may be used in conjunction with all other provisions of the regular code and ADA regulations.|26 2025 CALIFORNIA HISTORICAL BUILDING CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
HISTORY NOTE APPENDIX
2025 California Historical Building Code California Code of Regulations, Title 24, Part 8
HISTORY:
For prior history, see the History Note Appendix to the California Historical Building Code, 2022 Triennial Edition, effective January 1, 2023.
- Adoption of the 2025 California Historical Building Code, CCR Title 24, Part 8, carrying forward existing amendments from the 2022 edition. Effective on January 1, 2026.
2025 CALIFORNIA HISTORICAL BUILDING CODE 27
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
28 2025 CALIFORNIA HISTORICAL BUILDING CODE
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
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CHBC § 12.7 Medium relevance — show source text
Values are for strength level loads as defined in regular code standards.
2. Values may be adjusted for other fasteners when approved by the enforcing authority.
3. In addition to existing sheathing value.
4. Bolts to be1/2-inch (12.7 mm) minimum diameter.
5. Other bolt sizes, values and installation methods may be used provided a testing program is conducted in accordance with regular code standards. Bolt spacing shall not
exceed 6 feet (1830 mm) on center and shall not be less than 12 inches (305 mm) on center.
6. Other masonry based on tests or other substantiated data.
7. Embedded bolts to be tested as specified in regular code standards.
8. Stresses given may be increased for combinations of loads as specified in the regular code.
9. Adhesives shall be approved by the enforcing agency and installed in accordance with the manufacturer’s recommendations. All drilling dust shall be removed from drilled
holes prior to installation.|1. Values are for strength level loads as defined in regular code standards.
2. Values may be adjusted for other fasteners when approved by the enforcing authority.
3. In addition to existing sheathing value.
4. Bolts to be1/2-inch (12.7 mm) minimum diameter.
5. Other bolt sizes, values and installation methods may be used provided a testing program is conducted in accordance with regular code standards. Bolt spacing shall not
exceed 6 feet (1830 mm) on center and shall not be less than 12 inches (305 mm) on center.
6. Other masonry based on tests or other substantiated data.
7. Embedded bolts to be tested as specified in regular code standards.
8. Stresses given may be increased for combinations of loads as specified in the regular code.
9. Adhesives shall be approved by the enforcing agency and installed in accordance with the manufacturer’s recommendations. All drilling dust shall be removed from drilled
holes prior to installation.|18 2025 CALIFORNIA HISTORICAL BUILDING CODE
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8-9 MECHANICAL, PLUMBING AND ELECTRICAL REQUIREMENTS
SECTION 8-901 — PURPOSE, INTENT AND SCOPE
8-901.1 Purpose. The purpose of the CHBC is to provide regulations for the mechanical, plumbing and electrical systems of buildings designated as qualified historical buildings or properties. The CHBC requires enforcing agencies to accept any reasonable equivalent solutions to the regular code when dealing with qualified historical buildings or properties.
8-901.2 Intent. The intent of the CHBC is to preserve the integrity of qualified historical buildings or properties while providing a reasonable level of protection from fire, health and life safety hazards (hereinafter referred to as safety hazards) for the building occupants.
8-901.3 Scope. The CHBC shall be applied in conjunction with the regular code whenever compliance with the regular code is required for qualified historical buildings or properties.
Frequently asked questions
Can the local building official refuse a spacing waiver?
Yes. The enforcing agency must determine that strict compliance is impracticable before granting a waiver under § 8-904.2.5. If they find the proposed alternative does not preserve safety or is unnecessary, they can require compliance.
If I get a waiver for spacing, do I still need GFCI protection when replacing an outlet?
Yes. The CHBC requires GFCI-protected receptacles where replacements are made at outlets that would be required to have GFCI protection under the regular code (§ 8-904.2.2). A spacing waiver does not automatically waive these wiring-safety provisions.
Does CHBC give numeric spacing limits for receptacles?
No. § 8-904.2.5 provides waiver/modify authority but does not list numeric spacing dimensions. Numeric spacing is in the regular electrical code; use CHBC to request relief when that spacing is impracticable to achieve.
What documentation helps win a waiver?
Photographs, measured drawings, a clear description of the historic materials at risk, an explanation why conventional installation is destructive or impracticable, and a safety/alternative plan showing equivalent protection. The CHBC expects the enforcing agency to make the impracticability determination.
If an outlet extension is added, must the new run be grounded?
If you extend an existing branch circuit that lacks an equipment grounding conductor, the new extension may supply grounding-type devices only when the new extension’s equipment grounding conductor is grounded to an accessible point on the grounding electrode system (§ 8-904.2.4).
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