CHBC · California Historical Building Code

When are fire alarm and automatic sprinkler systems required for historical buildings?

If a qualified historic building can’t meet regular-code construction rules and is judged a distinct hazard, the CHBC lets you provide an automatic sprinkler system (or an approved life-safety/engineering alternative) to be treated as compliance. Fire alarms are still required per the regular code. The CHBC spells which NFPA sprinkler standard applies by building height and size (see **§ 8-410.1** and **§ 8-410.2**) .

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Last reviewed: July 6, 2026

What the code requires — 2–4 sentences

Every qualified historical building must be provided with fire alarm systems as required for the building’s use or occupancy under the regular code (see § 8-409). When a qualified historical building cannot be made to conform to the regular-code construction requirements and constitutes a distinct fire hazard, the building may be brought into compliance by providing an automatic sprinkler system, an approved life‑safety system, or other approved technologies (see § 8-410.1 and the sprinkler standards in § 8-410.2) .

The single most important rule: If a historic building can’t meet regular-code construction requirements and creates a distinct hazard, the CHBC treats providing an approved sprinkler or life‑safety system as an alternate path to compliance (see § 8-410.1) .

Requirements in detail

Short plain-English summary of the three controlling sections

  • § 8-409 — Fire alarm systems: Every qualified historical building must have the fire alarm protection required by the regular code for that occupancy (or an approved alternative) .
  • § 8-410.1 — When sprinklers (or alternatives) satisfy construction nonconformance: If the historic building can’t meet regular-code construction requirements and is a distinct fire hazard, providing an automatic sprinkler system, approved life‑safety system, or other technologies approved by the enforcing agency will be treated as compliance .
  • § 8-410.2 — Which sprinkler standard applies: When the CHBC requires sprinklers, the applicable NFPA standard is specified by building height/type (NFPA 13D, 13R, or 13) and other conditions; see the table below for the mapping .

Decision table — which system / standard applies

Decision factor (what you check) Requirement / Threshold Code Reference
Is the building required to have a fire alarm for its occupancy? Yes — provide fire alarm per the regular code (or approved alternative) § 8-409
Building “cannot be made to conform” to regular-code construction and is a distinct fire hazard Provide automatic sprinkler system, approved life-safety system, or other approved technology to be deemed in compliance § 8-410.1
Sprinkler standard — buildings of four stories or less NFPA 13R (for nonhazardous occupancies) § 8-410.2 (1)
Sprinkler standard — floors above the fourth NFPA 13 § 8-410.2 (2)
Sprinkler standard — buildings with floors above 75 feet NFPA 13 § 8-410.2 (3)
Sprinkler standard — free‑standing building or separated by property line, two floors and ≤ 1,500 ft² per floor NFPA 13D § 8-410.2 (4)
Repeated use of sprinklers to “reach compliance” (three or more occasions) Require upgrade: 13D → 13R or 13R → 13 § 8-410.2 Exception
Can sprinklers replace required exits? No — sprinklers shall not substitute for required exits § 8-410.3
Detention facilities Automatic sprinklers required § 8-410.4

How fire alarms and sprinklers interact with other CHBC options

  • The CHBC allows accepting “other technologies” (fire modeling, smoke control, detection/notification systems, timed egress analysis, etc.) as alternatives to correct nonconformance when approved by the enforcing agency — see § 8-411 .
  • Automatic sprinklers are also used as a method to avoid certain upgrade requirements: e.g., one-hour fire-resistive upgrades and some occupancy-separation upgrades may be reduced or omitted when sprinklers are provided (see § 8-402.2 and § 8-302.3 for occupancy separation exceptions) .

Exceptions & special cases

  • Alternatives to sprinklers: If the enforcing agency approves an equivalent life‑safety system or other technologies, those may be accepted instead of sprinklers to achieve compliance under § 8-410.1 and the technology acceptance language in § 8-411 .
  • Limited buildings (small free‑standing): Where a building is free‑standing (or has property line separation) and is two floors and ≤ 1,500 sq ft per floor, the CHBC permits application of NFPA 13D rather than 13R/13 — see § 8-410.2(4) .
  • “Upgrade count” exception: If sprinklers are repeatedly relied upon to reach compliance on three or more occasions, the CHBC requires stepping up the design standard (13D → 13R or 13R → 13) — see the exception in § 8-410.2 .
  • Sprinklers do not excuse required exits: An automatic sprinkler system cannot be used as an alternate to the required number of exits (see § 8-410.3) .
  • High-rise rules: Qualified historical buildings with occupied floors more than 75 feet above the lowest access must conform to the regular-code high-rise provisions as amended by the CHBC; sprinklers and other high-rise systems are addressed in § 8-412 and § 8-410.2 (NFPA 13 applies for >75 ft) .
  • Detention facilities are explicitly required to have sprinklers per § 8-410.4 .

If you need the text of the regular code (CBC/CFC) triggers for fire alarm thresholds by occupancy (for example, when an assembly occupancy must have a certain type of alarm), that is in the regular code — the CHBC defers to “as required for the use or occupancy by the regular code” in § 8-409; the CHBC text in your files does not reproduce those regular-code thresholds, so consult the regular code (CBC/CFC) or ask me to pull those specific regular-code references for your occupancy type .

Common mistakes

  • Mistake: “Historic buildings never need sprinklers.” Reality: The CHBC does not waive sprinkler requirements; it offers sprinkler (or approved alternatives) as an accepted path to compliance when the building cannot meet regular-code construction requirements and is a distinct hazard (§ 8-410.1) .
  • Mistake: “Any historic building gets the lightest NFPA standard (13D).” Reality: NFPA 13D only applies in the narrow circumstance of a free‑standing building with two floors and ≤ 1,500 ft² per floor; otherwise 13R or 13 applies by the height/condition rules in § 8-410.2 .
  • Mistake: “A sprinkler system can reduce required exits.” Reality: The code explicitly forbids using sprinklers to substitute for required exits (§ 8-410.3) .
  • Mistake: “If I add sprinklers, I can ignore alarms.” Reality: Fire alarm systems must still be provided as required by the regular code for the occupancy or by an approved alternative (§ 8-409) .
  • Mistake: “Any engineering alternative is automatically accepted.” Reality: The enforcing agency must approve alternatives (life-safety systems, modeling, etc.); acceptance is not automatic — see § 8-410.1 and § 8-411 .

Worked example — step-by-step application

Scenario: You have a qualified historical, 3‑story apartment building (nonhazardous occupancy). The building cannot be made to meet the construction requirements in the regular code (e.g., its original stair and wall construction cannot be modified without destroying historic fabric) and the enforcing agency determines it constitutes a distinct fire hazard.

Step 1 — Fire alarm: Per § 8-409, the building must have fire alarm systems as required by the regular code for that occupancy (or an approved alternative). So confirm the regular code alarm requirement for multi-family dwellings and provide that system or an approved alternative (see § 8-409) .

Step 2 — Sprinkler path to compliance: Because the building “cannot be made to conform” and is a distinct hazard, the owner may provide an automatic sprinkler system (or an approved life‑safety system) to be deemed in compliance under § 8-410.1 .

Step 3 — Which NFPA standard? This is a three‑story building (less than or equal to four stories), so § 8-410.2(1) directs use of NFPA 13R for nonhazardous occupancies. That means design/installation should follow NFPA 13R unless the enforcing agency directs otherwise or the building triggers a different subsection (e.g., >75 ft) .

Step 4 — Check other impacts: Installing a sprinkler system may allow reductions in occupancy separations or avoid one-hour upgrades per § 8-302.3 and § 8-402.2 (for example, some separations may be reduced or omitted when the building is sprinklered throughout) — coordinate with the enforcing agency on the exact benefits and required documentation .

Net result (concrete): Provide the regular-code-required fire alarm, install an NFPA 13R automatic sprinkler system throughout, and document the life-safety equivalency to the enforcing agency; this will be treated as compliance per § 8-410.1 and § 8-410.2 .

Related provisions (CHBC sections to check next)

  • § 8-409 — Fire Alarm Systems (primary fire‑alarm requirement)
  • § 8-410.1 — Automatic sprinkler systems; when used as compliance option for distinct hazards
  • § 8-410.2 — Sprinkler standards and NFPA mapping (13D / 13R / 13)
  • § 8-410.3 — Sprinklers cannot substitute for exits
  • § 8-410.4 — Sprinklers required for detention facilities
  • § 8-411 — Acceptance of other technologies and engineering methods (life-safety alternatives)
  • § 8-402.1 / § 8-402.2 — Fire‑resistive construction exceptions and how sprinklers satisfy exterior wall/opening protection or one‑hour upgrade relief
  • § 8-302.3 / § 8-302.4 — Occupancy separation and maximum floor area exceptions when sprinklers or alarms are provided

If you want, I can extract the specific regular-code (CBC/CFC) alarm triggers for a particular occupancy (assembly, residential, mercantile, etc.) so you know exactly what the CHBC’s § 8-409 phrase “as required for the use or occupancy by the regular code” means in your case.

Code references

Grounded in the retrieved California Historical Building Code — click a citation to read the verbatim passage:

  • CHBC § 8-404 High relevance — show source text

    Exception: When an automatic sprinkler system is provided throughout the building, existing finishes shall be approved.

    SECTION 8-404 — WOOD LATH AND PLASTER

    Wood lath and plaster walls may be considered in accordance with codes, standards and listings published prior to 1943 whereby a wood stud wall assembly with gypsum or lime plaster on hand split or sawn wooden lath obtains a one-half-hour fire-resistive rating. This rating may be increased for interior walls to as much as one hour by filling the wall with mineral fiber or glass fiber.

    SECTION 8-405 — OCCUPANCY SEPARATION

    See Chapter 8-3.

    SECTION 8-406 — MAXIMUM FLOOR AREA

    See Chapter 8-3.

    SECTION 8-407 — VERTICAL SHAFTS

    Vertical shafts need not be enclosed when such shafts are blocked at every floor level by the installation of not less than 2 full inches (51 mm) of solid wood or equivalent construction to prevent the initial passage of smoke and flame. Automatic sprinkler systems or other solutions may be considered on a case-by-case basis, in lieu of enclosure of vertical shafts and stairwells.

    SECTION 8-408 — ROOF COVERING

    Existing or original roofing materials may be repaired or reconstructed subject to the following requirements:

    1. The original or historical roofing system shall be detailed or modified as necessary in order to be capable of providing shelter while preserving the historical materials and appearance of the roof.

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    FIRE PROTECTION

    1. Wooden roof materials may be utilized where fire resistance is required, provided they are treated with fire-retardant treatments to achieve a Class “B” roof covering rating. Wood roofing in state designated Urban Wildland and High Fire Zones shall be permitted when installed in Class “A” assemblies.
    2. Jurisdictions that prohibit wood roofing materials for application as roof coverings and roof assemblies shall submit documentation for the adoption. Express Terms, statement of reasons and minutes of the action by the adopting authority Health and Safety Code, Section 18959(f).

    SECTION 8-409 — FIRE ALARM SYSTEMS

    Every qualified historical building or property shall be provided with fire alarm systems as required for the use or occupancy by the regular code or other approved alternative.

    SECTION 8-410 — AUTOMATIC SPRINKLER SYSTEMS

    8-410.1 Every qualified historical building or property which cannot be made to conform to the construction requirements specified in the regular code for the occupancy or use, and which constitutes a distinct fire hazard (for definition of “Distinct Hazard,” see Chapter 8-2), shall be deemed to be in compliance if provided with an automatic sprinkler system or a life safety system or other technologies as approved by the enforcing agency. (“Automatic” is defined in the regular code. “Sprinkler System” is defined in this section.)

    8-410.2 When required by the CHBC, an automatic sprinkler system is defined by the following standards as adopted by the State Fire Marshal (for nonhazardous occupancies).

    1. Buildings of four stories or less: NFPA 13R.
    2. For floors above the fourth, NFPA 13.
  • CHBC § 8-409 High relevance — show source text

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    FIRE PROTECTION

    1. Wooden roof materials may be utilized where fire resistance is required, provided they are treated with fire-retardant treatments to achieve a Class “B” roof covering rating. Wood roofing in state designated Urban Wildland and High Fire Zones shall be permitted when installed in Class “A” assemblies.
    2. Jurisdictions that prohibit wood roofing materials for application as roof coverings and roof assemblies shall submit documentation for the adoption. Express Terms, statement of reasons and minutes of the action by the adopting authority Health and Safety Code, Section 18959(f).

    SECTION 8-409 — FIRE ALARM SYSTEMS

    Every qualified historical building or property shall be provided with fire alarm systems as required for the use or occupancy by the regular code or other approved alternative.

    SECTION 8-410 — AUTOMATIC SPRINKLER SYSTEMS

    8-410.1 Every qualified historical building or property which cannot be made to conform to the construction requirements specified in the regular code for the occupancy or use, and which constitutes a distinct fire hazard (for definition of “Distinct Hazard,” see Chapter 8-2), shall be deemed to be in compliance if provided with an automatic sprinkler system or a life safety system or other technologies as approved by the enforcing agency. (“Automatic” is defined in the regular code. “Sprinkler System” is defined in this section.)

    8-410.2 When required by the CHBC, an automatic sprinkler system is defined by the following standards as adopted by the State Fire Marshal (for nonhazardous occupancies).

    1. Buildings of four stories or less: NFPA 13R.

    2. For floors above the fourth, NFPA 13.

    3. Buildings with floors above 75 feet, NFPA 13.

    4. When the building is free standing or with property line separation, two floors and 1500 square feet per floor or less, NFPA 13D.

    5. For exterior wall and opening protection. As required by this chapter.

    Exception: When the automatic sprinkler systems are used to reach compliance using this code, in three or more occasions, NFPA 13D standard shall be increased to NFPA 13R standard, or NFPA 13R standard shall be increased to a NFPA 13 standard.

    8-410.3 Automatic sprinkler systems shall not be used to substitute for or act as an alternate to the required number of exits from any facility. (See Chapter 8-5 for exiting requirements.)

    8-410.4 An automatic sprinkler system shall be provided in all detention facilities.

    SECTION 8-411 — OTHER TECHNOLOGIES

    Fire alarm systems, smoke and heat detection systems, occupant notification and annunciation systems, smoke control systems and fire modeling, timed egress analysis and modeling, as well as other engineering methods and technologies may be accepted by the enforcing agency to address areas of nonconformance.

    SECTION 8-412 — HIGH-RISE BUILDINGS

    Qualified historical buildings having floors for human occupancy located more than 75 feet above the lowest floor level having building access shall conform to the provisions of the regular code for existing high-rise buildings as amended by the CHBC.

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    8-5 MEANS OF EGRESS

  • CHBC § 8-3 High relevance — show source text

    TREATMENT. An act of work to carry out preservation, restoration, stabilization, rehabilitation or reconstruction.

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    8-3 USE AND OCCUPANCY

    SECTION 8-301 — PURPOSE AND SCOPE

    8-301.1 Purpose. The purpose of the CHBC is to provide regulations for the determination of occupancy classifications and conditions of use for qualified historical buildings or properties.

    8-301.2 Scope. Every qualified historical building or property for which a permit or approval has been requested shall be classified prior to permit issuance according to its use or the character of its occupancy in accordance with the regular code and applicable provisions of this chapter.

    SECTION 8-302 — GENERAL

    8-302.1 Existing use. The use or character of occupancy of a qualified historical building or property, or portion thereof, shall be permitted to continue in use regardless of any period of time in which it may have remained unoccupied or in other uses, provided such building or property otherwise conforms to all applicable requirements of the CHBC.

    8-302.2 Change in occupancy. The use or character of the occupancy of a qualified historical building or property may be changed from or returned to its historical use or character, provided the qualified historical building or property conforms to the requirements applicable to the new use or character of occupancy as set forth in the CHBC. Such change in occupancy shall not mandate conformance with new construction requirements as set forth in regular code.

    8-302.3 Occupancy separations. Required occupancy separations of more than one hour may be reduced to one-hour fire-resistive construction with all openings protected by not less than three-fourths-hour fire-resistive assemblies of the self-closing or automatic-closing type when the building is provided with an automatic sprinkler system throughout the entire building in accordance with Section 8-410.2. Doors equipped with automatic-closing devices shall be of a type which will function upon activation of a device which responds to products of combustion other than heat.

    Required occupancy separations of one hour may be omitted when the building is provided with an automatic sprinkler system throughout.

    8-302.4 Maximum floor area. Regardless of the use or character of occupancy, the area of a one-story qualified historical building or property may have, but shall not exceed, a floor area of 15,000 square feet (1393.5 m [2] ) unless such an increase is otherwise permitted in regular code. Multistory qualified historical buildings (including basements and cellars) shall be in accordance with regular code requirements.

    Exception: Historical buildings may be unlimited in floor area without fire-resistive area separation walls:

    1. When provided with an automatic sprinkler, or
    2. Residential occupancies of two stories or less when provided with a complete fire alarm and annunciation system and where the exiting system conforms to regular code.

    8-302.5 Maximum height. The maximum height and number of stories of a qualified historical building or property shall not be limited because of construction type, provided such height or number of stories does not exceed that of its historical design.

  • CHBC § 8-302.3 High relevance — show source text

    8-302.3 Occupancy separations. Required occupancy separations of more than one hour may be reduced to one-hour fire-resistive construction with all openings protected by not less than three-fourths-hour fire-resistive assemblies of the self-closing or automatic-closing type when the building is provided with an automatic sprinkler system throughout the entire building in accordance with Section 8-410.2. Doors equipped with automatic-closing devices shall be of a type which will function upon activation of a device which responds to products of combustion other than heat.

    Required occupancy separations of one hour may be omitted when the building is provided with an automatic sprinkler system throughout.

    8-302.4 Maximum floor area. Regardless of the use or character of occupancy, the area of a one-story qualified historical building or property may have, but shall not exceed, a floor area of 15,000 square feet (1393.5 m [2] ) unless such an increase is otherwise permitted in regular code. Multistory qualified historical buildings (including basements and cellars) shall be in accordance with regular code requirements.

    Exception: Historical buildings may be unlimited in floor area without fire-resistive area separation walls:

    1. When provided with an automatic sprinkler, or
    2. Residential occupancies of two stories or less when provided with a complete fire alarm and annunciation system and where the exiting system conforms to regular code.

    8-302.5 Maximum height. The maximum height and number of stories of a qualified historical building or property shall not be limited because of construction type, provided such height or number of stories does not exceed that of its historical design.

    8-302.5.1 High-rise buildings. Occupancies B, F-1, F-2 or S in high-rise buildings with floors located more than 75 feet above the lowest floor level having building access may be permitted with only the stories over 75 feet provided with an automatic fire sprinkler system if:

    1. The building construction type and the exits conform to regular code, and
    2. A complete building fire alarm and annunciation system is installed, and
    3. A fire barrier is provided between the sprinklered and nonsprinklered floors.

    8-302.6 Fire-resistive construction. See Chapter 8-4.

    8-302.7 Light and ventilation. Existing provisions for light and ventilation which do not, in the opinion of the enforcing agency, constitute a safety hazard may remain. See Section 8-303.6 for residential requirements. See Section 8-503 for Escape or Rescue Windows and Doors.

    SECTION 8-303 — RESIDENTIAL OCCUPANCIES

    8-303.1 Purpose. The purpose of this section is to provide regulations for those buildings designated as qualified historical buildings or properties and classified as residential occupancies. The CHBC requires enforcing agencies to accept any reasonably equivalent alternative to the regular code when dealing with qualified historical buildings and properties.

    8-303.2 Intent. The intent of the CHBC is to preserve the integrity of qualified historical buildings and properties while maintaining a reasonable degree of protection of life, health and safety for the occupants.

    8-303.3 Application and scope. The provisions of this section shall apply to all qualified historical buildings used for human habitation. Those dwelling units intended only for display, or public use with no residential use involved, need not comply with the requirements of this section.

    8-303.4 Fire escapes. See Chapter 8-5.

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  • CHBC § 8-402 High relevance — show source text

    SECTION 8-402 — FIRE-RESISTIVE CONSTRUCTION

    8-402.1 Exterior wall construction. The fire-resistance requirement for existing exterior walls and existing opening protection may be satisfied when an automatic sprinkler system designed for exposure protection is installed per the CHBC. The automatic sprinklers may be installed on the exterior with at least one sprinkler located over each opening required to be protected. Additional sprinklers shall also be distributed along combustible walls under the roof lines that do not meet the fire-resistive requirement due to relationship to property lines as required by regular code. Such sprinkler systems may be connected to the domestic water supply on the supply-main side of the building shut-off valve. A shut-off valve may be installed for the sprinkler system, provided it is locked in an open position.

    8-402.2 One-hour construction. Upgrading an existing qualified historical building or property to one-hour fire-resistive construction and one-hour fire-resistive corridors shall not be required regardless of construction or occupancy when one of the following is provided:

    1. An automatic sprinkler system throughout. See Section 8-410 for automatic sprinkler systems.
    2. An approved life safety evaluation.
    3. Other alternative measures as approved by the enforcing agency.

    8-402.3 Openings in fire-rated systems. Historical glazing materials and solid wood unrated doors in interior walls required to have one-hour fire rating may be approved when operable windows and doors are provided with appropriate smoke seals and when the area affected is provided with an automatic sprinkler system. See Section 8-410 for automatic sprinkler systems.

    SECTION 8-403 — INTERIOR FINISH MATERIALS

    New non-historical interior wall and ceiling finishes shall conform to the provisions of the regular code. Existing non-conforming materials used in interior walls and finishes may be surfaced with an approved fire-retardant to increase the rating of the natural finish to within reasonable proximity of the required rating. For wood lath and plaster walls, see Section 8-404.

    Exception: When an automatic sprinkler system is provided throughout the building, existing finishes shall be approved.

    SECTION 8-404 — WOOD LATH AND PLASTER

    Wood lath and plaster walls may be considered in accordance with codes, standards and listings published prior to 1943 whereby a wood stud wall assembly with gypsum or lime plaster on hand split or sawn wooden lath obtains a one-half-hour fire-resistive rating. This rating may be increased for interior walls to as much as one hour by filling the wall with mineral fiber or glass fiber.

    SECTION 8-405 — OCCUPANCY SEPARATION

    See Chapter 8-3.

    SECTION 8-406 — MAXIMUM FLOOR AREA

    See Chapter 8-3.

    SECTION 8-407 — VERTICAL SHAFTS

    Vertical shafts need not be enclosed when such shafts are blocked at every floor level by the installation of not less than 2 full inches (51 mm) of solid wood or equivalent construction to prevent the initial passage of smoke and flame. Automatic sprinkler systems or other solutions may be considered on a case-by-case basis, in lieu of enclosure of vertical shafts and stairwells.

    SECTION 8-408 — ROOF COVERING

    Existing or original roofing materials may be repaired or reconstructed subject to the following requirements:

    1. The original or historical roofing system shall be detailed or modified as necessary in order to be capable of providing shelter while preserving the historical materials and appearance of the roof.
  • CHBC § 903.4.2 High relevance — show source text
    1. Underground key or hub gate valves in roadway boxes.

    903.4.2 Monitoring. Alarm, supervisory and trouble signals shall be distinctly different and shall be automatically transmitted to an approved supervising station or, where approved by the fire code official, shall sound an audible signal at a constantly attended location.

    903.4.3 Alarms. An approved audible and visual sprinkler waterflow alarm device, located on the exterior of the building in an approved location, shall be connected to each automatic sprinkler system. Such sprinkler waterflow alarm devices shall be activated by water flow equivalent to the flow of a single sprinkler of the smallest orifice size installed in the system. Where a waterflow switch is required by Section 903.4.1 to be electrically supervised, such sprinkler waterflow alarm devices shall be powered by a fire alarm control unit or, where provided, a fire alarm system. Where a fire alarm system is provided, actuation of the automatic sprinkler system shall actuate the building fire alarm system.

    Exception: Automatic sprinkler systems protecting one- and two-family dwellings.

    903.5 Inspection, testing and maintenance. Automatic sprinkler systems shall be inspected, tested and maintained in accordance with Section 901.

    903.6 Where required in existing buildings and structures. An automatic sprinkler system shall be provided in existing buildings and structures where required in Chapter 11.

    SECTION 904—ALTERNATIVE AUTOMATIC FIRE-EXTINGUISHING SYSTEMS

    904.1 General. Automatic fire-extinguishing systems, other than automatic sprinkler systems, shall be designed, installed, inspected, tested and maintained in accordance with the provisions of this section and the applicable referenced standards.

    [California Code of Regulations, Title 19, Division 1, §904(a)(2)] Required Inspection, Testing and Maintenance Frequencies.

    (2) Engineered and pre-engineered fixed extinguishing systems shall be inspected, tested and maintained at least semi-annually, and immediately after a system activation.

    [California Code of Regulations, Title 19, Division 1, §904(c)] Required Inspection, Testing and Maintenance Frequencies.

    (c) Engineered and pre-engineered fixed extinguishing systems, regardless of installation date, shall be inspected, tested and main- tained within the time periods specified in California Code of Regulations, Title 19, Division 1, Section 904(a)(2) above.

    [California Code of Regulations, Title 19, Division 1, §904.7(a) through (c)] Inspection, Testing and Maintenance Requirements for Engineered and Pre-engineered Fixed Extinguishing Systems.

    Inspection, Testing and Maintenance shall be performed in accordance with:

    (a) California Code of Regulations, Title 19, Division 1, Section 904(a)(2),

    (b) the manufacturer’s written instructions, which are approved and on file with the Office of the State Fire Marshal; and

    (c) the applicable standards adopted in California Code of Regulations, Title 24, Part 9, (California Fire Code).

    904.1.1 Certification of service personnel for fire-extinguishing equipment. Service personnel providing or conducting maintenance on automatic fire-extinguishing systems, other than automatic sprinkler systems, shall possess a valid certificate issued by an approved governmental agency, or other approved organization for the type of system and work performed.

    904.2 Where permitted. Automatic fire-extinguishing systems installed as an alternative to the required automatic sprinkler systems of Section 903 shall be approved by the fire code official.

  • CHBC § 8-303.6 High relevance — show source text

    8-303.6 Light and ventilation. Windows in habitable rooms shall have an area of 6 percent of the floor area, or 6 square feet (0.56 m [2] ), whichever is greater. Windows in sleeping rooms shall be openable (see Section 8-503). Residential occupancies need not be provided with electrical lighting.

    8-303.7 Alteration and repair. The alteration and repair of qualified historical buildings or properties may permit the replacement, retention and extension of original materials and the continued use of original methods of construction, provided a life safety hazard is not created or continued. Alterations and repairs shall be consistent with the CHBC.

    The amount of alterations and repairs is not limited, provided there is no nonhistorical increase in floor area, volume or size of the building or property.

    8-303.8 Exiting. See Chapter 8-5.

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    8-4 FIRE PROTECTION

    SECTION 8-401 — PURPOSE, INTENT AND SCOPE

    8-401.1 Purpose. The purpose of this chapter is to provide regulations for fire protection of qualified historical buildings or properties. The CHBC requires enforcing agencies to accept any reasonably equivalent alternatives to the regular code when dealing with qualified historical buildings or properties.

    8-401.2 Intent. The intent of the CHBC is to preserve the integrity of qualified historical buildings or properties while maintaining a reasonable degree of fire protection based primarily on the life safety of the occupants and firefighting personnel.

    8-401.3 Scope. This chapter shall apply when required by the provisions of Section 8-102.

    SECTION 8-402 — FIRE-RESISTIVE CONSTRUCTION

    8-402.1 Exterior wall construction. The fire-resistance requirement for existing exterior walls and existing opening protection may be satisfied when an automatic sprinkler system designed for exposure protection is installed per the CHBC. The automatic sprinklers may be installed on the exterior with at least one sprinkler located over each opening required to be protected. Additional sprinklers shall also be distributed along combustible walls under the roof lines that do not meet the fire-resistive requirement due to relationship to property lines as required by regular code. Such sprinkler systems may be connected to the domestic water supply on the supply-main side of the building shut-off valve. A shut-off valve may be installed for the sprinkler system, provided it is locked in an open position.

    8-402.2 One-hour construction. Upgrading an existing qualified historical building or property to one-hour fire-resistive construction and one-hour fire-resistive corridors shall not be required regardless of construction or occupancy when one of the following is provided:

    1. An automatic sprinkler system throughout. See Section 8-410 for automatic sprinkler systems.
    2. An approved life safety evaluation.
    3. Other alternative measures as approved by the enforcing agency.

    8-402.3 Openings in fire-rated systems. Historical glazing materials and solid wood unrated doors in interior walls required to have one-hour fire rating may be approved when operable windows and doors are provided with appropriate smoke seals and when the area affected is provided with an automatic sprinkler system. See Section 8-410 for automatic sprinkler systems.

    SECTION 8-403 — INTERIOR FINISH MATERIALS

  • CHBC § 914.3.1.2.1 High relevance — show source text

    914.3.1.2.1 Fire pumps. Redundant fire pump systems shall be required for high-rise buildings having an occupied floor more than 200 feet above the lowest level of fire department vehicle access. Each fire pump system shall be capable of automatically supplying the required demand for the automatic sprinkler and standpipe systems.

    914.3.2 Secondary water supply. An automatic secondary on-site water supply having a usable capacity not less than the hydraulically calculated sprinkler demand, including the hose stream requirement, shall be provided for high-rise buildings and Group I-2 occupancies having occupied floors located more than 75 ft above the lowest level of fire department vehicle access assigned to Seismic Design Category C, D, E or F as determined by the California Building Code . An additional fire pump shall not be required for the secondary water supply unless needed to provide the minimum design intake pressure at the suction side of the fire pump supplying the automatic sprinkler system. The secondary water supply shall have a useable capacity of not less than the hydraulically calculated sprinkler demand plus 100 GPM for the inside hose stream, allowance for a duration of not less than 30 minutes as determined by the occupancy hazard classification in accordance with NFPA 13 , whichever is greater. The Class I stand- pipe system demand shall not be required to be included in the secondary on-site water supply calculations. In no case shall the secondary on-site water supply be less than 15,000 gallons.

    914.3.3 Fire alarm system. A fire alarm system shall be provided in accordance with Section 907.2.13.

    914.3.4 Automatic smoke detection. Smoke detection shall be provided in accordance with Section 907.2.13.1.

    914.3.5 Emergency voice/alarm communication system. An emergency voice/alarm communication system shall be provided in accordance with Section 907.5.2.2.

    914.3.6 Emergency responder communication coverage. In-building, two-way emergency responder communication coverage shall be provided in accordance with Section 510.

    914.3.7 Fire command. A fire command center complying with Section 508 shall be provided in a location approved by the fire department.

    914.3.8 Smoke control.

    914.3.8.1 Smoke control system. All portions of high-rise buildings shall be provided with a smoke control system in accordance with California Building Code, Section 909.

    914.3.8.2 Smokeproof exit enclosures. Every exit enclosure in high-rise buildings shall comply with California Building Code, Sections 909.20 and 1023.12. Every required stairway in Group I-2 occupancies serving floors more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access shall comply with Sections 909.20 and 1023.12 of the California Building Code.

    Exception: In high-rise buildings, exit enclosures serving three or less adjacent floors where one of the adjacent floors is the level of exit discharge.

    914.4 Atriums. Atriums shall comply with Sections 914.4.1 and 914.4.2.

    914.4.1 Automatic sprinkler system. An approved automatic sprinkler system shall be installed throughout the entire building.

  • CHBC § 8-408 High relevance — show source text

    8-408 Roof Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8-409 Fire Alarm Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8-410 Automatic Sprinkler Systems. . . . . . . . . . . . . . . . . . . . . 8 8-411 Other Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8-412 High-rise Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    CHAPTER 8-5 MEANS OF EGRESS . . . . . . . . . . . . . . . . . . . . . . 9

    Section

    8-501 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . . 9 8-502 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

    8-503 Escape or Rescue Windows and Doors. . . . . . . . . . . . 10 8-504 Railings and Guardrails . . . . . . . . . . . . . . . . . . . . . . . . . 10

    CHAPTER 8-6 ACCESSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . 11

    Section

    8-601 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . 11

    8-602 Basic Provisions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

    8-603 Alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

    8-604 Equivalent Facilitation. . . . . . . . . . . . . . . . . . . . . . . . . . 12

    CHAPTER 8-7 STRUCTURAL REGULATIONS. . . . . . . . . . . . . 13

    Section

    8-701 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . 13 8-702 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

    8-703 Structural Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8-704 Nonhistorical Additions and

    Nonhistorical Alterations . . . . . . . . . . . . . . . . . . . . . . . 13

  • CHBC § 8-410.3 High relevance — show source text

    1. Buildings with floors above 75 feet, NFPA 13.

    2. When the building is free standing or with property line separation, two floors and 1500 square feet per floor or less, NFPA 13D.

    3. For exterior wall and opening protection. As required by this chapter.

    Exception: When the automatic sprinkler systems are used to reach compliance using this code, in three or more occasions, NFPA 13D standard shall be increased to NFPA 13R standard, or NFPA 13R standard shall be increased to a NFPA 13 standard.

    8-410.3 Automatic sprinkler systems shall not be used to substitute for or act as an alternate to the required number of exits from any facility. (See Chapter 8-5 for exiting requirements.)

    8-410.4 An automatic sprinkler system shall be provided in all detention facilities.

    SECTION 8-411 — OTHER TECHNOLOGIES

    Fire alarm systems, smoke and heat detection systems, occupant notification and annunciation systems, smoke control systems and fire modeling, timed egress analysis and modeling, as well as other engineering methods and technologies may be accepted by the enforcing agency to address areas of nonconformance.

    SECTION 8-412 — HIGH-RISE BUILDINGS

    Qualified historical buildings having floors for human occupancy located more than 75 feet above the lowest floor level having building access shall conform to the provisions of the regular code for existing high-rise buildings as amended by the CHBC.

    8 2025 CALIFORNIA HISTORICAL BUILDING CODE

    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

    8-5 MEANS OF EGRESS

    SECTION 8-501 — PURPOSE, INTENT AND SCOPE

    8-501.1 Purpose. The purpose of this chapter is to establish minimum means of egress regulations for qualified historical buildings or properties. The CHBC requires enforcing agencies to accept reasonably equivalent alternatives to the means of egress requirements in the regular code.

    8-501.2 Intent. The intent of these regulations is to provide an adequate means of egress.

    8-501.3 Scope. Every qualified historical building or portion thereof shall be provided with exits as required by the CHBC when required by the provisions of Section 8-102.

    SECTION 8-502 — GENERAL

    8-502.1 General. The enforcing agency shall grant reasonable exceptions to the specific provisions of applicable egress regulations where such exceptions will not adversely affect life safety.

    8-502.2. Existing door openings and corridor widths of less than dimensions required by regular code shall be permitted where there is sufficient width and height for the occupants to pass through the opening or traverse the exit.

    8-502.3 Stairs. Existing stairs having risers and treads or width at variance with the regular code are allowed if determined by the enforcing agency to not constitute a distinct hazard. Handrails with nonconforming grip size or extensions are allowed if determined by the enforcing agency to not constitute a distinct hazard.

    8-502.4 Main entry doors. The front or main entry doors need not be rehung to swing in the direction of exit travel, provided other means or conditions of exiting, as necessary to serve the total occupant load, are provided.

  • CHBC § 8-301 High relevance — show source text

    Section

    8-301 Purpose and Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8-302 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

    8-303 Residential Occupancies. . . . . . . . . . . . . . . . . . . . . . . . . 5

    CHAPTER 8-4 FIRE PROTECTION. . . . . . . . . . . . . . . . . . . . . . . 7

    Section

    8-401 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . . 7

    8-402 Fire-resistive Construction . . . . . . . . . . . . . . . . . . . . . . . 7

    8-403 Interior Finish Materials. . . . . . . . . . . . . . . . . . . . . . . . . . 7

    8-404 Wood Lath and Plaster. . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    8-405 Occupancy Separation . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8-406 Maximum Floor Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    8-407 Vertical Shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

    8-408 Roof Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 8-409 Fire Alarm Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8-410 Automatic Sprinkler Systems. . . . . . . . . . . . . . . . . . . . . 8 8-411 Other Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8-412 High-rise Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    CHAPTER 8-5 MEANS OF EGRESS . . . . . . . . . . . . . . . . . . . . . . 9

    Section

    8-501 Purpose, Intent and Scope . . . . . . . . . . . . . . . . . . . . . . . 9 8-502 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

    8-503 Escape or Rescue Windows and Doors. . . . . . . . . . . . 10 8-504 Railings and Guardrails . . . . . . . . . . . . . . . . . . . . . . . . . 10

  • CHBC § 402.4.2.3 Medium relevance — show source text

    The automatic sprinkler system shall be complete and operative throughout occupied space in the mall building prior to occupancy of any of the tenant spaces. Unoccupied tenant spaces shall be similarly protected unless provided with approved alternative protection. 2. Sprinkler protection for the mall of a covered mall building shall be independent from that provided for tenant spaces or anchor buildings. 3. Sprinkler protection for the tenant spaces of an open mall building shall be independent from that provided for anchor buildings. 4. Sprinkler protection shall be provided beneath exterior circulation balconies located adjacent to an open mall. 5. Where tenant spaces are supplied by the same system, they shall be independently controlled.

    Exception: An automatic sprinkler system shall not be required in spaces or areas of open parking garages separated from the covered or open mall in accordance with Section 402.4.2.3 of the California Building Code and constructed in accordance with Section 406.5 of the California Building Code .

    914.2.2 Standpipe system. The covered and open mall building shall be equipped throughout with a standpipe system as required by Section 905.3.3. 914.2.3 Emergency voice/alarm communication system. Where the total floor area exceeds 50,000 square feet (4645 m [2] ) within either a covered mall building or within the perimeter line of an open mall building, an emergency voice/alarm communication system shall be provided. Access to emergency voice/alarm communication systems serving a mall, required or otherwise, shall be provided for the fire department. The system shall be provided in accordance with Section 907.5.2.2.

    914.2.4 Fire department access to equipment. Rooms or areas containing controls for air-conditioning systems or fire protection systems shall be identified for use by the fire department.

    914.3 High-rise buildings. High-rise buildings and Group I-2 occupancies having occupied floors located more than 75 feet above the lowest level of fire department vehicle access shall comply with Sections 914.3.1 through 914.3.7.

    914.3.1 Automatic sprinkler system. Buildings and structures shall be equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 and a secondary water supply where required by Section 914.3.2. A sprinkler water-flow alarm-initiating device and a control valve with a supervisory signal-initiating device shall be provided at the lateral connection to the riser on each floor.

    Exception: An automatic sprinkler system shall not be required in spaces or areas of telecommunications equipment buildings used exclusively for telecommunications equipment, associated electrical power distribution equipment, batteries and standby engines, provided that those spaces or areas are equipped throughout with an automatic fire detection system in accordance with Section 907.2 and are separated from the remainder of the building by not less than 1-hour fire barriers constructed in accordance with Section 707 of the California Building Code or not less than 2-hour horizontal assemblies constructed in accordance with Section 711 of the California Building Code, or both.

    914.3.1.1 Number of sprinkler system risers and system design. The number of sprinkler risers and design shall comply with Section 914.3.1.1.1 or 914.3.1.1.2 based on building height.

Frequently asked questions

Does the CHBC ever let me use something other than sprinklers to avoid upgrades?

Yes. § 8-410.1 allows an approved life‑safety system or other technologies accepted by the enforcing agency as an alternate to automatic sprinklers to address construction nonconformance; see also § 8-411 for accepted technologies and engineering methods .

If I install sprinklers, do I still need a fire alarm?

Yes. § 8-409 requires fire alarm systems as required by the regular code for the occupancy (or an approved alternative). Sprinklers do not automatically remove alarm requirements .

Which NFPA standard applies for a 5‑story historic hotel?

Per § 8-410.2, floors above the fourth require NFPA 13, so a 5‑story building would use NFPA 13 for sprinkler design (unless another applicable clause/exception applies) .

Can I use NFPA 13D for a small, two‑story historic retail shop?

Possibly — § 8-410.2(4) permits NFPA 13D when the building is free‑standing (or separated), is two floors, and is ≤ 1,500 ft² per floor. Confirm separation and floor-area conditions with the enforcing agency .

If I’ve already used sprinklers to meet code on multiple past projects, does the CHBC require anything different now?

Yes. The exception in § 8-410.2 says that when sprinklers are used to reach compliance on three or more occasions, the design standard must be upgraded (13D → 13R or 13R → 13) .

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