Which edition am I designing to? The errata edited the standards chapters

Here's the thing about a referenced standard: the name alone doesn't tell you which rulebook you're bound to. "AISC 370" or "ASCE/SEI 41" names a document — but each of those documents has editions, and only one edition carries legal force in California at a time. Which one? Whatever the code's referenced-standards chapter says. Design to the wrong year and your numbers can be perfectly correct against the wrong book. That's a correction waiting to happen.

The January 2026 errata to the 2025 Title 24 code books reached into several of those chapters at once — restoring a standard that had gone missing, deleting one that's no longer published, adding an edition row to a reference table, and tightening two steel provisions. Most errata is housekeeping, but edits to the referenced-standards chapter are worth a second look: it's the chapter where a bare standard name becomes the edition you're bound to. Here's what changed, book by book.

The referenced-standards chapter is the pin

Every Title 24 book ends with a chapter that lists, for each standard it cites, the promulgating agency, the standard designation, the edition year, the title, and the code sections that invoke it. That chapter — Chapter 35 in the Building Code, Chapter 16 in the Existing Building Code — is where a bare standard name becomes a standard with a year attached. It's the difference between citing a standard and citing the enforceable one.

So when an errata edits that chapter, the controlling edition can shift without a single design provision being rewritten. Three books got exactly that treatment.

Building Code, Chapter 35: one out, one back in

• ICC-ES AC 106-24 was deleted — the Acceptance Criteria for Predrilled Fasteners (Screw Anchors) in Masonry — because that document is no longer published. If it lives in one of your specs, it now points at nothing.
• ICC/NSSA 500-2023 was added. It had been erroneously omitted from the first printing. The ICC/NSSA Standard for the Design and Construction of Storm Shelters is back in the chapter — the document the code's §423 storm-shelter provisions rely on.

Verified against the live CBC Chapter 35 text: ICC/NSSA 500—2023, "ICC/NSSA Standard for the Design and Construction of Storm Shelters," referenced by §§202, 423.1–423.5, 1031.2, 1604.5.1, and 1604.10.

The steel chapter: two narrow but real edits

• Sections 2203.1 / 2203A.1 (structural stainless steel). The word "manufacture" was deleted and replaced with "fabrication." The provision now reads that the design, fabrication and erection of austenitic and duplex structural stainless steel shall be in accordance with AISC 370. "Fabrication" is the term of art that matches how AISC 370 is written and enforced — a one-word fix with real meaning for a detailer.
• Sections 2213.1 / 2213A.1 were clarified so the standard — MHI ANSI/MH 32.1 — applies specifically to material-handling structures: the stairs, ladders, and guarding serving steel storage racks and industrial steel work platforms.

Small words. They decide whether a section lands on your scope or not.

Existing Building Code, Chapter 16: ASCE 41 and the elevator standards

• The Matrix Adoption Table now includes ASCE/SEI 41-2017, sitting alongside the 2013 and 2023 editions already listed. ASCE/SEI 41 is the seismic evaluation and retrofit standard for existing buildings, and the edition your section invokes drives the analysis. The Matrix Adoption Table is nonregulatory — so confirm the controlling edition against the section that actually points to it.
• The referenced-section pointers to ASME A17.1, A17.3, and A18.1 were deleted. Those are the elevator, existing-elevator, and platform-lift safety standards. They still appear in the chapter list, but no Existing Building Code section now points to them.

Find the edition you're actually bound to

When you cite a standard on a plan or in a spec, don't stop at the name:

1. Open the referenced-standards chapter of the exact Title 24 book you're in — Chapter 35 in the CBC, Chapter 16 in the CEBC.
2. Read the edition year printed next to the designation. That's the controlling one.
3. Confirm the section that invokes the standard wasn't renumbered or repointed by the same errata.
4. Remember the edition follows the permit date: applications submitted on or after January 1, 2026 fall under the 2025 code (with this errata); applications received on or before December 31, 2025 stay on the 2022 code.

When the stakes are high, verify the controlling edition with your local jurisdiction before you stamp.

What CrossBeam does with it

CrossBeam tracks the referenced-standards chapter of every Title 24 book, so you can see at a glance which edition of a standard is in force — and know the day an errata changes that answer. When a pin moves, you catch it before a plan checker does.