CHBC · California Historical Building Code

When can alternative accessibility provisions be used?

If making a historic home’s entrance meet the regular accessibility rules would destroy its historic features, the CHBC lets the official approve limited, documented alternatives (like a nearby accessible entrance, prioritized smaller door openings, power‑assist doors, short steep ramps, or programmatic/virtual access). These alternatives are allowed element‑by‑element, must follow the options listed in Section 8-603 (and the alternative standards in § 8-603.1), and require written documentation kept on file per **§ 8-602.2** .

Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

The CHBC allows using alternative accessibility provisions when strict compliance with the regular accessibility code would threaten or destroy the historical significance or character-defining features of a qualified historical building or property — § 8-602.2 . Those alternatives must be applied item‑by‑item or case‑by‑case and supported by retained documentation explaining the reasons for the alternative — § 8-602.2 . The alternatives available are the specific options listed in Chapter 8-6 (Section 8-603) and the alternative minimum standards referenced in § 8-603.1 .

The single most important rule: if following the regular accessibility code would harm the building’s historic character, you may use CHBC alternatives — but only for that specific element, only after documenting why, and only as listed in Section 8-603 (and its related provisions). § 8-602.2


Requirements in detail

When alternatives are permitted (high level)

  • Alternatives are permitted only where strict compliance with the regular code threatens or destroys the building’s historical significance or character‑defining features§ 8-602.1 and § 8-602.2 .
  • Alternatives must be applied item‑by‑item or case‑by‑case; you cannot broadly exempt an entire project without separate determinations for each element — § 8-602.2 .
  • The CHBC’s alternative minimum standards for alterations reference Section 202.5 of the 2010 ADA Standards (as adopted in 28 CFR Pt. 36) — § 8-603.1 .

Required documentation and recordkeeping

  • The enforcing agency’s permanent file must contain documentation (such as meeting minutes or letters) stating the reasons the alternative is applied and showing that it was considered on an item‑by‑item basis — § 8-602.2 .
  • Equivalent facilitation (use of other designs/technologies when even the Section 8-603 alternatives would threaten historic features) also requires documentation, including opinions from accessibility officials and representative groups of people with disabilities — § 8-604 .

Decision‑relevant dimensions (quick reference table)

Decision dimension Typical allowed value / option Code Reference
When to use alternatives Where strict compliance would threaten or destroy historical significance or character‑defining features § 8-602.2
Application scope Item‑by‑item or case‑by‑case only § 8-602.2
Alternative minimum standards As referenced in Section 202.5, 2010 ADA Standards (28 CFR Pt. 36) § 8-603.1
Accessible entrance distance Accessible entrance must be within 200 ft (60,960 mm) of primary entrance when required § 8-603.2
Door clear width alternatives Priority list: 30 in (762 mm) clear single leaf, 29½ in (749 mm) single leaf, double leaf with one leaf 29½ in (749 mm), or double doors with power assist to achieve 29½ in § 8-603.3
Power‑assisted doors May substitute for level landings, strikeside clearance and opening forces required by regular code § 8-603.4
Ramp / lift alternatives Lift or ramp slope up to 1:10 for horizontal distances ≤ 5 ft (1525 mm); ramps 1:6 for horizontal distance ≤ 13 in (330 mm) § 8-603.6
Toilet rooms May provide accessible unisex toilet in lieu of separate‑gender rooms § 8-603.5
Equivalent facilitation (tech alternatives) Maps, plans, videos, VR, or other means if 8-603 alternatives would also threaten historic features; must provide substantially equivalent or greater accessibility § 8-604

Priority and order of alternatives

  • Section 8-603 lists specific alternatives (e.g., entrance options, door clearances, ramps/lifts) and, in some cases, orders them by priority (e.g., door options in § 8-603.3) — use the listed order when selecting the least‑impact alternative first — § 8-603.3 .
  • Power‑assisted doors are explicitly recognized as an equivalent alternative to some regular‑code requirements when used appropriately — § 8-603.4 .

Exceptions & special cases

  • The CHBC alternatives are limited to qualified historical buildings or properties; they do not apply to new construction or reconstructions/replicas — see § 8-601.3 (scope) for applicability limitations. The CHBC solutions are election‑based (owner/agency) and tied to buildings qualified under local or state designation processes — § 8-601 .
  • An explicit exception in the alternatives for doors states that the listed alternatives do not apply to alteration of commercial facilities and places of public accommodation (Title III entities) where noted — see § 8-603.3 (Exception) . (Always confirm the Table of Applicability for Title II/III status in the CHBC.)
  • If the Section 8-603 alternatives themselves would threaten or destroy historic character, the enforcing official may consider equivalent facilitation (e.g., virtual or service‑based access) under § 8-604, but this also requires documentation and stakeholder input — § 8-604 .
  • Use of CHBC alternatives does not automatically produce federal ADA waivers or federal certification; certain federal certification consequences are noted in § 8-604 (e.g., application as a waiver of an ADA requirement may affect DOJ certification) — § 8-604 .

Common mistakes

  • Treating the CHBC as a blanket exemption. The code requires a showing that strict compliance would threaten or destroy historic character and requires item‑by‑item documentation — § 8-602.2 .
  • Failing to document the decision or to retain meeting minutes/letters in the enforcing agency’s permanent file — documentation is mandatory for applying alternatives — § 8-602.2 .
  • Selecting an alternative that the CHBC does not list (or using the wrong order of priority) without SHBSB review or enforcing agency approval — Section 8-603 lists the acceptable alternatives and priorities — § 8-603 .
  • Assuming alternatives apply to new construction, reconstructions, or non‑qualified buildings — CHBC is limited to qualified historical buildings or properties and does not apply to new construction — § 8-601.3 .
  • Overlooking Title II/III distinctions (public entities vs. private places of public accommodation); some alternatives are limited for Title III alterations — see applicability notes and the exception in § 8-603.3 .

Worked example — storefront with historic threshold

Scenario: A downtown historic shop is a qualified historical building. The primary street entrance features an original carved stone threshold that would be destroyed by installing a flush level landing required by regular accessibility standards.

Step 1 — Establish that strict compliance threatens historic fabric: The owner documents that cutting and replacing the stone threshold would destroy a character‑defining feature. That documentation is kept in the enforcing agency file — § 8-602.2 .

Step 2 — Check CHBC alternatives applicable to entry and doors:

  • If the primary entrance cannot be made accessible without harm, provide access to an entrance used by the public that is within 200 ft (60,960 mm) of the primary entrance and provide directional signs and a notification system — § 8-603.2 .
  • If modifying the door is an option, use the prioritized door alternatives: try to achieve a 30 in (762 mm) clear single leaf first; if not feasible, consider 29½ in (749 mm) or power‑assisted double doors to meet the 29½ in clear opening — § 8-603.3 and § 8-603.4 .

Step 3 — Select and document a least‑impact alternative:

  • Suppose an accessible side entrance exists 120 ft away and can be signed, with a call/notification panel at the primary entrance for remote assistance. The owner documents the decision, stakeholders are consulted, and the enforcing agency files the record — this meets the CHBC alternative path for entry access — § 8-603.2 and § 8-602.2 .

If no physical alternative listed in § 8-603 provides acceptable access without historic harm, consider equivalent facilitation (e.g., virtual tours, staffed assistance) under § 8-604, again documenting the rationale and stakeholder input — § 8-604 .


Related provisions

  • § 8-602.1 — Regular code applies unless it threatens historic significance; tied to the trigger for alternatives .
  • § 8-603.1 — Alternative minimum standards reference Section 202.5 of the 2010 ADA Standards (28 CFR Pt. 36) .
  • § 8-603.2 — Entry access rules, 200 ft limit, notification system requirement .
  • § 8-603.3 — Door clear opening priority list and exception language .
  • § 8-603.4 — Use of power‑assisted doors as an equivalent alternative .
  • § 8-603.5 — Unisex accessible toilet option .
  • § 8-603.6 — Exterior/interior ramp and lift slope alternatives (1:10, 1:6 options and distance limits) .
  • § 8-604 — Equivalent facilitation: use of other designs/technologies and required documentation & stakeholder input .
  • § 8-601.3 — Scope: CHBC applies only to qualified historical buildings/properties and not to new construction .

Code references

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

  • CHBC § 8-604 High relevance — show source text

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    ACCESSIBILITY

    SECTION 8-604 EQUIVALENT FACILITATION

    Use of other designs and technologies, or deviation from particular technical and scoping requirements, are permitted if the application of the alternative provisions contained in Section 8-603 would threaten or destroy the historical significance or characterdefining features of the historical building or property.

    1. Such alternatives shall be applied only on an item-by- item or a case-by-case basis.
    2. Access provided by experiences, services, functions, materials and resources through methods including, but not limited to, maps, plans, videos, virtual reality and related equipment, at accessible levels. The alternative design and/or technologies used will provide substantially equivalent or greater accessibility to, and usability of, the facility.
    3. The official charged with the enforcement of the standards shall document the reasons for the application of the design and/or technologies and their effect on the historical significance or character-defining features. 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.

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    8-7 STRUCTURAL REGULATIONS

    SECTION 8-701 PURPOSE, INTENT AND SCOPE

    8-701.1 Purpose. The purpose of the CHBC is to provide alternative regulations to the regular code for the structural safety of buildings designated as 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.

    8-701.2 Intent. The intent of this chapter is to encourage the preservation of qualified historical buildings or structures while providing standards for a minimum level of building performance with the objective of preventing partial or total structural collapse such that the overall risk of life-threatening injury as a result of structural collapse is low.

    8-701.3 Application. The alternative structural regulations provided by Section 8-705 are to be applied in conjunction with the regular code whenever a structural upgrade or reconstruction is undertaken for qualified historical buildings or properties.

    SECTION 8-702 GENERAL

    8-702.1 The CHBC shall not be construed to allow the enforcing agency to approve or permit a lower level of safety of structural design and construction than that which is reasonably equivalent to the regular code provisions in occupancies which are critical to the safety and welfare of the public at large, including, but not limited to, public and private schools, hospitals, municipal police and fire stations and essential services facilities.

    8-702.2 Nothing in these regulations shall prevent voluntary and partial seismic upgrades when it is demonstrated that such upgrades will improve life safety and when a full upgrade would not otherwise be required.

  • CHBC § 8-602 High relevance — show source text

    ** The provisions in the CHBC apply to local, state and federal
    governments (Title II entities); alteration of commercial facilities and places of public
    accommodation (Title III entities); and barrier removal in commercial facilities and places of
    public accommodation (Title III entities). Except as noted in this chapter.|Applies|Applies|Applies| |SECTION 8-602 — BASIC PROVISIONS
    8-602.1 Regular code. The regular code for access for people with disabilities (Title 24, Part
    2, Vol.1, Chapter 11B) shall be applied to qualified historical buildings or properties unless
    strict compliance with the regular code will threaten or destroy the historical significance or
    character-defining features of the building or property.
    **8-602.2 Alternative provisions.**If the historical significance or character-defining features
    are threatened, alternative provisions for access may be applied pursuant to this chapter,
    provided the following conditions are met:
    1.These provisions shall be applied only on an item-by-item or case-by-case basis.
    2.Documentation is provided, including meeting minutes or letters, stating the reasons
    for the application of the alternative provisions. Such documentation shall be retained
    in the permanent file of the enforcing agency.|Applies|Applies|Applies| |Section 8-603 — ALTERNATIVES
    **8-603.1 Alternative minimum standards.**The alternative minimum standards for alter-
    ations of qualified historical buildings or facilities are referenced in Section 202.5 of the_ 2010_
    ADA Standards for Accessible Design, as incorporated and set forth in federal regulation 28
    CFR Pt. 36.
    **8-603.2 Entry.**These alternatives do not allow exceptions for the requirement of level land-
    ings in front of doors, except as provided in Section 8-603.4.
    1.Access to any entrance used by the general public and no further than 200 feet (60 960
    mm) from the primary entrance.
    2.Access at any entrance not used by general public but open and unlocked with
    directional signs at the primary entrance and as close as possible to, but no further than
    200 feet (60 960 mm) from, the primary entrance.
    3.The accessible entrance shall have a notification system. Where security is a problem,
    remote monitoring may be used.|Applies|Applies|Applies| |**8-603.3 Doors.**Alternatives listed in order of priority are:
    1.Single-leaf door which provides a minimum 30 inches (762 mm) of clear opening.
    2.Single-leaf door which provides a minimum 291/2 inches (749 mm) clear opening.
    3.Double door, one leaf of which provides a minimum 291/2 inches (749 mm) clear
    opening.
    4.Double doors operable with a power-assist device to provide a minimum 291/2 inches
    (749 mm) clear opening when both doors are in the open position.
    **Exception:**Alternatives in this section do not apply to alteration of commercial facilities
    and places of public accommodation (Title III entities).|Does not
    apply|Does not
    apply|Applies|

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    APPENDIX A

  • CHBC § 8-503 High relevance — show source text

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    MEANS OF EGRESS

    SECTION 8-503 ESCAPE OR RESCUE WINDOWS AND DOORS

    Basements in dwelling units and every sleeping room below the fourth floor shall have at least one openable window or door approved for emergency escape which shall open directly into a public street, public way, yard or exit court. Escape or rescue windows or doors shall have a minimum clear area of 3.3 square feet (0.31 m [2] ) and a minimum width or height dimension of 18 inches (457 mm) and be operable from the inside to provide a full, clear opening without the use of special tools.

    SECTION 8-504 RAILINGS AND GUARDRAILS

    The height of railings and guard railings and the spacing of balusters may continue in their historical height and spacing unless a distinct hazard has been identified or created by a change in use or occupancy.

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    8-6 ACCESSIBILITY

    SECTION 8-601 PURPOSE, INTENT AND SCOPE

    8-601.1 Purpose. The purpose of the CHBC is to provide alternative regulations to facilitate access and use by persons with disabilities to and throughout facilities designated as qualified historical buildings or properties. These regulations require enforcing agencies to accept alternatives to regular code when dealing with qualified historical buildings or properties.

    8-601.2 Intent. The intent of this chapter is to preserve the integrity of qualified historical buildings and properties while providing access to and use by persons with disabilities.

    8-601.3 Scope. The CHBC shall apply to every qualified historical building or property that is required to provide access to persons with disabilities.

    1. Provisions of this chapter do not apply to new construction or reconstruction/replicas of historical buildings.
    2. Where provisions of this chapter apply to alteration of qualified historical buildings or properties, alteration is defined in California Building Code (CBC), Chapter 2.

    8-601.4 General application. The provisions in the CHBC apply to local, state and federal governments (Title II entities); alteration of commercial facilities and places of public accommodation (Title III entities); and barrier removal in commercial facilities and places of public accommodation (Title III entities). Except as noted in this chapter.

    SECTION 8-602 BASIC PROVISIONS

    8-602.1 Regular code. The regular code for access for people with disabilities (Title 24, Part 2, Vol. 1, Chapter 11B) shall be applied to qualified historical buildings or properties unless strict compliance with the regular code will threaten or destroy the historical significance or character-defining features of the building or property.

    8-602.2 Alternative provisions. If the historical significance or character-defining features are threatened, alternative provisions for access may be applied pursuant to this chapter, provided the following conditions are met:

    1. These provisions shall be applied only on an item-by-item or a case-by-case basis.
    2. Documentation is provided, including meeting minutes or letters, stating the reasons for the application of the alternative provisions. Such documentation shall be retained in the permanent file of the enforcing agency.

    SECTION 8-603 ALTERNATIVES

  • CHBC § 8-6 High relevance — show source text

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    APPENDIX A Col2 Col3 Col4
    CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY
    Title II
    Public Entities
    Title III
    Private Entities
    Title III
    Barrier Removal
    SECTION 8-601 PURPOSE, INTENT, SCOPE
    **8-601.1 Purpose.**The purpose of the CHBC is to provide alternative regulations to facilitate
    access and use by persons with disabilities to and throughout facilities designated as quali-
    fied historical buildings or properties. These regulations require enforcing agencies to
    accept alternatives to regular code when dealing with qualified historical buildings or
    properties.
    **8-601.2 Intent.**The intent of this chapter is to preserve the integrity of qualified historical
    buildings and properties while providing access to and use by persons with disabilities.
    **8-601.3 Scope.**The CHBC shall apply to every qualified historical building or property that
    is required to provide access to persons with disabilities.
    1.Provisions of this chapter do not apply to new construction or reconstruction/replicas of
    historical buildings.
    2. Where provisions of this chapter apply to alteration of qualified historical buildings or
    properties, alteration is defined in_ California Building Code_ (CBC), Chapter 2.
    8-601.4 General application. The provisions in the CHBC apply to local, state and federal
    governments (Title II entities); alteration of commercial facilities and places of public
    accommodation (Title III entities); and barrier removal in commercial facilities and places of
    public accommodation (Title III entities). Except as noted in this chapter.
    Applies Applies Applies
    SECTION 8-602 — BASIC PROVISIONS
    8-602.1 Regular code. The regular code for access for people with disabilities (Title 24, Part
    2, Vol.1, Chapter 11B) shall be applied to qualified historical buildings or properties unless
    strict compliance with the regular code will threaten or destroy the historical significance or
    character-defining features of the building or property.
    **8-602.2 Alternative provisions.**If the historical significance or character-defining features
    are threatened, alternative provisions for access may be applied pursuant to this chapter,
    provided the following conditions are met:
    1.These provisions shall be applied only on an item-by-item or case-by-case basis.
    2.Documentation is provided, including meeting minutes or letters, stating the reasons
    for the application of the alternative provisions. Such documentation shall be retained
    in the permanent file of the enforcing agency.
    Applies Applies Applies
    Section 8-603 — ALTERNATIVES
    **8-603.1 Alternative minimum standards.**The alternative minimum standards for alter-
    ations of qualified historical buildings or facilities are referenced in Section 202.5 of the_ 2010_
    ADA Standards for Accessible Design, as incorporated and set forth in federal regulation 28
    CFR Pt. 36.
    **8-603.2 Entry.
  • CHBC § 8-601.3 High relevance — show source text

    8-601.3 Scope. The CHBC shall apply to every qualified historical building or property that is required to provide access to persons with disabilities.

    1. Provisions of this chapter do not apply to new construction or reconstruction/replicas of historical buildings.
    2. Where provisions of this chapter apply to alteration of qualified historical buildings or properties, alteration is defined in California Building Code (CBC), Chapter 2.

    8-601.4 General application. The provisions in the CHBC apply to local, state and federal governments (Title II entities); alteration of commercial facilities and places of public accommodation (Title III entities); and barrier removal in commercial facilities and places of public accommodation (Title III entities). Except as noted in this chapter.

    SECTION 8-602 BASIC PROVISIONS

    8-602.1 Regular code. The regular code for access for people with disabilities (Title 24, Part 2, Vol. 1, Chapter 11B) shall be applied to qualified historical buildings or properties unless strict compliance with the regular code will threaten or destroy the historical significance or character-defining features of the building or property.

    8-602.2 Alternative provisions. If the historical significance or character-defining features are threatened, alternative provisions for access may be applied pursuant to this chapter, provided the following conditions are met:

    1. These provisions shall be applied only on an item-by-item or a case-by-case basis.
    2. Documentation is provided, including meeting minutes or letters, stating the reasons for the application of the alternative provisions. Such documentation shall be retained in the permanent file of the enforcing agency.

    SECTION 8-603 ALTERNATIVES

    8-603.1 Alternative minimum standards. The alternative minimum standards for alterations of qualified historical buildings or facilities are referenced in Section 202.5 of the 2010 ADA Standards for Accessible Design, as incorporated and set forth in federal regulation 28 CFR Pt. 36.

    8-603.2 Entry. These alternatives do not allow exceptions for the requirement of level landings in front of doors, except as provided in Section 8-603.4.

    1. Access to any entrance used by the general public and no further than 200 feet (60 960 mm) from the primary entrance.
    2. Access at any entrance not used by the general public but open and unlocked with directional signs at the primary entrance and as close as possible to, but no further than 200 feet (60 960 mm) from, the primary entrance.
    3. The accessible entrance shall have a notification system. Where security is a problem, remote monitoring may be used.

    8-603.3 Doors. Alternatives listed in order of priority are:

    1. Single-leaf door which provides a minimum 30 inches (762 mm) of clear opening.
    2. Single-leaf door which provides a minimum 29 [1] / 2 inches (749 mm) clear opening
    3. Double door, one leaf of which provides a minimum 29 [1] / 2 inches (749 mm) clear opening.
    4. Double doors operable with a power-assist device to provide a minimum 29 [1] / 2 inches (749 mm) clear opening when both doors are in the open position.

    8-603.4 Power-assisted doors. Power-assisted door or doors may be considered an equivalent alternative to level landings, strikeside clearance and door-opening forces required by the regular code.

    8-603.5 Toilet rooms. In lieu of separate-gender toilet facilities as required in the regular code, an accessible unisex toilet facility may be designated.

  • CHBC § 8-603.5 High relevance — show source text

    **Power-assisted door or doors may be considered an
    equivalent alternative to level landings, strikeside clearance and door-opening forces
    required by regular code.
    8-603.5 Toilet rooms. In lieu of separate-gender toilet facilities as required in the regular
    code, an accessible unisex toilet may be designated.
    **8-603.6 Exterior and interior ramps and lifts.**Alternatives listed in order of priority are:
    1.A lift or a ramp of greater than standard slope but no greater than 1:10, for horizontal
    distances not to exceed 5 feet (1525 mm). Signs shall be posted at upper and lower
    levels to indicate steepness of the slope.
    2.Access by ramps of 1:6 slope for horizontal distance not to exceed 13 inches (330 mm).
    Signs shall be posted at upper and lower levels to indicate steepness of the slope.|Applies|Applies|Applies| |SECTION 8-604 — EQUIVALENT FACILITATION
    Use of other designs and technologies, or deviation from particular technical and scoping
    requirements, are permitted if the application of the alternative provisions contained in
    Section 8-603 would threaten or destroy the historical significance or character-defining
    features of the qualified historical building or property.
    1.Such alternatives shall be applied only on an item-by-item or case-by-case basis.
    2.Access provided by experiences, services, functions, materials and resources through
    methods including, but not limited to, maps, plans, videos, virtual reality and related
    equipment, at accessible levels. The alternative design and/or technologies used will
    provide substantially equivalent or greater accessibility to, and usability of, the
    facility.
    3.The official charged with the enforcement of the standards shall document the reasons
    for the application of the design and/or technologies and their effect on the historical
    significance or character-defining features. 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.

  • CHBC § 323-9843 High relevance — show source text

    State Librarian [SL]

    library.ca.gov csllaw@library.ca.gov (916) 323-9843 Public Library Construction & Renovation

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    HOW TO DETERMINE WHERE CHANGES HAVE BEEN MADE

    Symbols in the margins indicate where changes have been made or language has been deleted.

    This symbol indicates that a change has been made.

    • This symbol indicates deletion of language.

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    PART 8 CONTAINS ALTERNATIVE REGULATIONS

    FOR QUALIFIED HISTORICAL BUILDINGS

    The California Historical Building Code (CHBC) is unique among state regulations. The authoring of the original CHBC required state agencies promulgating regulations for building construction to work in harmony with representatives of other design and construction disciplines. The result was a totally new approach to building codes for historical structures, which maintains currently acceptable life safety standards. These regulations are also unique in that they are performance oriented rather than prescriptive. The provisions of the CHBC are to be applied by the enforcing authority of every city, county, city and county, or state agency in permitting repairs, alterations and additions necessary for the preservation, rehabilitation, relocation, related construction, change of use or continued use of a qualified historical building. The authority for use of the CHBC is vested in Sections 18950 through 18961 of the Health and Safety Code. Section 18954 states, “The building department of every city or county or other local agency that has jurisdiction over the enforcement of code within its legal authority shall apply the alternative standards and regulations adopted pursuant to Section 18959.5 in permitting repairs, alterations, and additions necessary for the preservation, restoration, rehabilitation, safety, moving, or continued use of a qualified historical building or structure. A state agency shall apply the alternative regulations adopted pursuant to Section 18959.5 in permitting repairs, alterations, and additions necessary for the preservation, restoration, rehabilitation, safety, moving, or continued use of a qualified historical building or structure.” However, be aware that in order to use the CHBC, the structure under consideration must be qualified by being designated as an historical building or structure. Section 18955 states, “For the purposes of this part, a qualified historical building or structure is any structure or property, collection of structures, and their related sites deemed of importance to the history, architecture, or culture of an area by an appropriate local or state governmental jurisdiction. This shall include historical buildings or structures on existing or future national, state or local historical registers or official inventories, such as the National Register of Historic Places, State Historical Landmarks, State Points of Historical Interest, and city or county registers or inventories of historical or architecturally significant sites, places, historic districts, or landmarks. This shall also include places, locations, or sites identified on these historical registers or official inventories and deemed of importance to the history, architecture, or culture of an area by an appropriate local or state governmental jurisdiction.” The regulations of the CHBC have the same authority as state law and are to be considered as such. Liability is the same as for prevailing law. The intent of the CHBC is to save California’s architectural heritage by recognizing the unique construction problems inherent in historical buildings and by providing a code to deal with these problems.

  • CHBC § 8-603.2 High relevance — show source text

    8-603.2 Entry. These alternatives do not allow exceptions for the requirement of level landings in front of doors, except as provided in Section 8-603.4.

    1. Access to any entrance used by the general public and no further than 200 feet (60 960 mm) from the primary entrance.
    2. Access at any entrance not used by the general public but open and unlocked with directional signs at the primary entrance and as close as possible to, but no further than 200 feet (60 960 mm) from, the primary entrance.
    3. The accessible entrance shall have a notification system. Where security is a problem, remote monitoring may be used.

    8-603.3 Doors. Alternatives listed in order of priority are:

    1. Single-leaf door which provides a minimum 30 inches (762 mm) of clear opening.
    2. Single-leaf door which provides a minimum 29 [1] / 2 inches (749 mm) clear opening
    3. Double door, one leaf of which provides a minimum 29 [1] / 2 inches (749 mm) clear opening.
    4. Double doors operable with a power-assist device to provide a minimum 29 [1] / 2 inches (749 mm) clear opening when both doors are in the open position.

    8-603.4 Power-assisted doors. Power-assisted door or doors may be considered an equivalent alternative to level landings, strikeside clearance and door-opening forces required by the regular code.

    8-603.5 Toilet rooms. In lieu of separate-gender toilet facilities as required in the regular code, an accessible unisex toilet facility may be designated.

    8-603.6 Exterior and interior ramps and lifts. Alternatives listed in order of priority are:

    1. A lift or a ramp of greater than standard slope but no greater than 1:10, for horizontal distances not to exceed 5 feet (1525 mm). Signs shall be posted at upper and lower levels to indicate steepness of the slope.
    2. Access by ramps of 1:6 slope for horizontal distance not to exceed 13 inches (330 mm). Signs shall be posted at upper and lower levels to indicate steepness of the slope.

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    ACCESSIBILITY

    SECTION 8-604 EQUIVALENT FACILITATION

    Use of other designs and technologies, or deviation from particular technical and scoping requirements, are permitted if the application of the alternative provisions contained in Section 8-603 would threaten or destroy the historical significance or characterdefining features of the historical building or property.

    1. Such alternatives shall be applied only on an item-by- item or a case-by-case basis.
    2. Access provided by experiences, services, functions, materials and resources through methods including, but not limited to, maps, plans, videos, virtual reality and related equipment, at accessible levels. The alternative design and/or technologies used will provide substantially equivalent or greater accessibility to, and usability of, the facility.
    3. The official charged with the enforcement of the standards shall document the reasons for the application of the design and/or technologies and their effect on the historical significance or character-defining features. 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.
  • CHBC § 8-1002.1 High relevance — show source text

    8-1002.1 The CHBC shall apply to all sites and districts and their features associated with qualified historical buildings or qualified historical districts as outlined in 8-1001.2 Scope.

    8-1002.2 Where the application of regular code may impact the associated features of qualified historical properties beyond their footprints, by work performed secondarily, those impacts shall also be covered by the CHBC.

    8-1002.3 This chapter shall be applied for all issues regarding code compliance or other standard or regulation as they affect the purpose of this chapter.

    8-1002.4 The application of any code or building standard shall not unduly restrict the use of a qualified historical building or property that is otherwise permitted pursuant to Chapter 8-3 and the intent of the State Historical Building Code, Section 18956.

    SECTION 8-1003 SITE RELATIONS

    The relationship between a building or property and its site, or the associated features of a district (including qualified historical landscape), site, objects and their features are critical components that may be one of the criteria for these buildings and properties to be qualified under the CHBC. The CHBC recognizes the importance of these relationships. This chapter shall be used to provide context sensitive solutions for treatment of qualified historical buildings, properties, district or their associated historical features, or when work to be performed secondarily impacts the associated historical features of a qualified historical building or property.

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    APPENDIX A Col2 Col3 Col4
    CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY CHAPTER 8-6—TABLE 1—PROVISION APPLICABILITY
    Title II
    Public Entities
    Title III
    Private Entities
    Title III
    Barrier Removal
    SECTION 8-601 PURPOSE, INTENT, SCOPE
    **8-601.1 Purpose.**The purpose of the CHBC is to provide alternative regulations to facilitate
    access and use by persons with disabilities to and throughout facilities designated as quali-
    fied historical buildings or properties. These regulations require enforcing agencies to
    accept alternatives to regular code when dealing with qualified historical buildings or
    properties.
    **8-601.2 Intent.**The intent of this chapter is to preserve the integrity of qualified historical
    buildings and properties while providing access to and use by persons with disabilities.
    **8-601.3 Scope.**The CHBC shall apply to every qualified historical building or property that
    is required to provide access to persons with disabilities.
    1.Provisions of this chapter do not apply to new construction or reconstruction/replicas of
    historical buildings.
    2. Where provisions of this chapter apply to alteration of qualified historical buildings or
    properties, alteration is defined in_ California Building Code_ (CBC), Chapter 2.
    **8-601.4 General application.
  • CHBC § 8-104.2 Medium relevance — show source text

    8-104.2 SHBSB review. When a proposed design, material or method of construction is being considered by the enforcing agency, the agency chief, the building official or the local board of appeals may file a written request for opinion to the SHBSB for its consideration, advice or findings. In considering such request, the SHBSB may seek the advice of other appropriate private or public boards, individuals, or state or local agencies. The SHBSB shall, after considering all of the facts presented, including any recommendation of other appropriate boards, agencies or other parties, determine if, for the purpose intended, the proposal is reasonably equivalent to that allowed by these regulations in proposed design, material or method of construction, and it shall transmit such findings and its decision to the enforcing agency for its application. The Board may recover the costs of such reviews and shall report the decision in printed form, copied to the California Building Standards Commission.

    8-104.2.1 State agencies. All state agencies with ownership of, or that act on behalf of state agency owners of, qualified historical buildings or properties, shall consult and obtain SHBSB review prior to taking action or making decisions or appeals that affect qualified historical buildings or properties, per Section 18961 of the Health and Safety Code.

    8-104.2.2 Imminent threat. Where an emergency is declared and a qualified historical building or property is declared an imminent threat to life and safety, the state agency assessing such a threat shall consult with the SHBSB before any demolition is undertaken, per Section 18961 of the Health and Safety Code.

    8-104.3 SHBC appeals. If any local agency administering and enforcing the CHBC or any person adversely affected by any regulation, rule, omission, interpretation, decision or practice of the agency enforcing the CHBC wishes to appeal the issue for resolution to the SHBSB, either of these parties may appeal directly to the Board. The Board may accept the appeal only if it determines that issues involved are of statewide significance. The Board may recover the costs of such reviews and shall make available copies of decisions in printed form at cost, copied to the California Building Standards Commission.

    8-104.4 Local agency fees. Local agencies, when actively involved in the appeal, may also charge affected persons reasonable fees not to exceed the cost of obtaining reviews and appeals from the Board.

    SECTION 8-105 CONSTRUCTION METHODS AND MATERIALS

    8-105.1 Repairs. Repairs to any portion of a qualified historical building or property may be made in-kind with historical materials and the use of original or existing historical methods of construction, subject to conditions of the CHBC. (See Chapter 8-8.)

    8-105.2 Solutions to the California Historical Building Code . Solutions provided in the CHBC, or any other acceptable regulation or methodology of design or construction and used in whole or in part, with the regular code, or with any combination of the regular code and the CHBC, shall be allowed. The CHBC does not preclude the use of any proposed alternative or method of design or construction not specifically prescribed or otherwise allowed by these regulations. Any alternative may be submitted for evaluation to the appropriate enforcing agency for review and acceptance. The enforcing agency may request that sufficient evidence or proof be submitted to substantiate any claims that may be made regarding such solutions. Any alternative offered in lieu of that prescribed or allowed in the CHBC shall be reasonably equivalent in quality, strength, effectiveness, durability and safety to that of the CHBC.

  • CHBC § 8-6 Medium relevance — show source text

    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

    8-705 Structural Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8-706 Lateral Load Regulations. . . . . . . . . . . . . . . . . . . . . . . . 14

    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

  • CHBC § 8-104.4 Medium relevance — show source text

    8-104.4 Local agency fees. Local agencies, when actively involved in the appeal, may also charge affected persons reasonable fees not to exceed the cost of obtaining reviews and appeals from the Board.

    SECTION 8-105 CONSTRUCTION METHODS AND MATERIALS

    8-105.1 Repairs. Repairs to any portion of a qualified historical building or property may be made in-kind with historical materials and the use of original or existing historical methods of construction, subject to conditions of the CHBC. (See Chapter 8-8.)

    8-105.2 Solutions to the California Historical Building Code . Solutions provided in the CHBC, or any other acceptable regulation or methodology of design or construction and used in whole or in part, with the regular code, or with any combination of the regular code and the CHBC, shall be allowed. The CHBC does not preclude the use of any proposed alternative or method of design or construction not specifically prescribed or otherwise allowed by these regulations. Any alternative may be submitted for evaluation to the appropriate enforcing agency for review and acceptance. The enforcing agency may request that sufficient evidence or proof be submitted to substantiate any claims that may be made regarding such solutions. Any alternative offered in lieu of that prescribed or allowed in the CHBC shall be reasonably equivalent in quality, strength, effectiveness, durability and safety to that of the CHBC.

    SECTION 8-106 SHBSB RULINGS

    8-106.1 General. Rulings of the SHBSB (i.e., formal appeals, case decisions, code interpretations and administrative resolutions, etc.) that are issues of statewide application are required to be submitted to the California Building Standards Commission in printed form. These rulings may be used to provide guidance for similar cases or issues.

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    8-2 DEFINITIONS

    SECTION 8-201 DEFINITIONS

    For the purpose of the CHBC, certain terms and phrases, words and their derivatives shall be construed as specified in this chapter. Additional definitions and/or terms may appear in the various other chapters relative to terms or phrases primarily applicable thereto. Any reference to “authority having jurisdiction” does not necessarily preclude the appellate process of Section 8-104.3.

    ADDITION. A nonhistorical extension or increase in floor area or height of a building or property.

    ALTERATION. A modification to a qualified historical building or property that affects the usability of the building or property, or part thereof. Alterations include, but are not limited to, remodeling, renovation, rehabilitation, reconstruction, historical restoration, changes or rearrangement of the structural parts or elements, and changes or rearrangements in the plan configuration of walls and full-height partitions.

    BUILDING STANDARD. Any guideline, regulation or code that may be applied to a qualified historical building or property.

    CHARACTER-DEFINING FEATURE. Those visual aspects and physical elements that comprise the appearance of a historical building or property, and that are significant to its historical, architectural and cultural values, including the overall shape of the historical building or property, its materials, craftsmanship, decorative details, interior spaces and features, as well as the various aspects of its site and environment.

    CULTURAL RESOURCE. Building, site, property, object or district evaluated as having significance in prehistory or history.

Frequently asked questions

Who decides whether strict compliance would “threaten or destroy” historic character?

The enforcing agency (local or state) makes the determination, guided by the CHBC; their decision should be documented and retained per § 8-602.2 .

Must alternatives be applied to an entire building if one element is historic?

No. Alternatives are required to be applied item‑by‑item or case‑by‑case, not blanketly across a project — § 8-602.2 .

If a listed CHBC alternative is used, can we still be in compliance with federal ADA?

CHBC alternatives reference ADA standards, but using CHBC alternatives (or equivalent facilitation) is a state code process; certain federal certification or DOJ certification implications may apply (see § 8-604). Confirm federal ADA obligations separately — § 8-603.1 and § 8-604 .

Are virtual or programmatic access options allowed?

Yes — equivalent facilitation under § 8-604 allows other designs or technologies (maps, videos, VR, staffed services) when 8-603 alternatives would also harm historic character; these must provide substantially equivalent accessibility and be documented .

Do the door alternatives in § 8-603.3 apply to Title III (private commercial) alterations?

There is an exception noted: some alternatives in § 8-603.3 do not apply to Title III alteration of commercial facilities and places of public accommodation; check the CHBC applicability tables and the exception text for Title III cases .

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