First confirm the building is a qualified historical building and that the documentation of its status is in the permit set, because the CHBC applies only to qualified historical buildings, structures, and properties. Then check that the code analysis names the regular code baseline and lists each CHBC alternative used, and that the egress, fire protection, accessibility, structural, and MEP sheets each follow the alternative the analysis claims. AI can flag conflicts; the design professional, the local building official, and the State Historical Building Safety Board decide.
What does the California Historical Building Code cover?
The California Historical Building Code is Part 8 of Title 24 and is California-only, with no model code behind it. Its chapters cover administration, definitions, use and occupancy, fire protection, means of egress, accessibility, structural regulations, archaic materials and methods of construction, and mechanical, plumbing, and electrical requirements. The State Historical Building Safety Board says the CHBC is not a stand-alone code and relies on a regularly adopted code, such as the California Building Code, as the baseline for its alternatives.
The California Building Standards Commission lists the 2025 Title 24, published July 1, 2025 and effective January 1, 2026, and links the Part 8 digital text. The Board’s initial statement of reasons for the cycle says it carries the 2022 CHBC forward without further amendment, and the commission’s 2025 change summary lists no changes to Part 8. Checked October 19, 2026.
The State Historical Building Safety Board, within the Division of the State Architect, decides whether an alternative is reasonably equivalent through consultation, review, and appeal. Its information manual says the local building official administers the code and the Board is the final administrative authority, that regular code triggers do not apply, and that local seismic ordinances still apply. See the CEBC guide for non-historic existing buildings and the historic preservation project page.
Gather the historic status record and the work drawings
Collect the documentation of the building’s qualified historical status, the historic structure report or character-defining features list if there is one, the code analysis with the regular code baseline and the CHBC alternatives used, existing conditions and demolition plans, new work plans, egress and life safety plans, fire protection drawings, accessibility plans, structural evaluation and retrofit drawings, and the MEP drawings for the altered areas.
Add any Board correspondence or prior determinations, because an alternative already accepted for this building should match what the drawings now show.
Trace CHBC decisions through the set
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Qualified historical status | Status documentation, cover sheet, code analysis | Confirm the building’s status is documented and that the code analysis relies on it. |
| Baseline and alternatives | Code analysis, general notes | Record the regular code baseline and each CHBC alternative claimed, chapter by chapter. |
| Means of egress and fire protection | Life safety plans, fire protection drawings, existing stair and door details | Check that each egress or fire protection alternative in the analysis matches what the life safety and fire sheets show. |
| Accessibility | Accessibility plans, entrance details, code analysis | Record which accessibility alternative is used and where it is drawn, including the entrance and route. |
| Structural and archaic materials | Structural evaluation, retrofit drawings, existing conditions, specifications | Confirm the structural approach is stated, local seismic ordinances are addressed, and archaic materials are identified where the alternatives rely on them. |
| Character-defining features | Historic structure report, demolition plans, elevations | Find demolition or new work that affects a listed feature the analysis says is preserved. |
Seismic evaluations continue in the ASCE 41 guide, existing building methods in the IEBC guide, and new construction in the California Building Code guide.
Example: an egress alternative the life safety plan does not show
Hypothetical example. A listed 1920s theater in Pasadena is being converted into an event venue. The code analysis claims a CHBC egress alternative to keep the original open stair, but the life safety plan shows the stair as a new enclosed exit stair, the fire protection drawings add sprinklers only on the main floor, and the analysis does not name the regular code baseline.
The code analysis claims a CHBC egress alternative for the original open stair, but the life safety plan shows a new enclosed exit stair, the sprinkler layout covers only the main floor, and the analysis does not state the regular code baseline. Confirm the egress approach and baseline, and coordinate the analysis, life safety plan, and fire protection drawings.
The architect confirms the approach with the building official and coordinates the sheets. The finding is a document conflict; the building official and the Board decide equivalency.
Review historical building work with Groundbook
Upload the current drawings and specifications to Groundbook, and state the edition, amendments, and review scope in your instructions. Add the California Historical Building Code edition the project uses from a copy you are licensed to use, where the license permits uploading it, and the jurisdiction’s published amendments. See how Groundbook works with local and licensed codes.
Compare the historic status documentation, historic structure report, code analysis, existing conditions and demolition plans, new work plans, life safety plans, fire protection, accessibility, structural, and MEP drawings, and any Board correspondence. Flag missing qualified historical status, no regular code baseline, CHBC alternatives the drawings do not follow, accessibility or structural approaches that differ between sheets, unaddressed local seismic ordinances, and work affecting a character-defining feature the analysis says is preserved. Use the supplied CHBC and cite both sources.
Groundbook links each potential finding to the sheets and documents involved. It does not determine historic status or whether an alternative is equivalent.
Document review does not certify compliance or decide equivalency. Those remain with the design professional, the local building official, and the State Historical Building Safety Board.