Appendix BM — 3D-PRINTED BUILDING CONSTRUCTION
BM104 Building Construction — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Residential Code (Title 24, Part 2.5) § BM104 · Effective January 1, 2026 · Official source: Building Standards Commission
BM104.1 Construction.¶
3D-printed buildings, structures and building elements shall be constructed in accordance with this section.
BM104.2 Construction method.¶
The building construction method, consisting of the manufacturer’s production equipment and fabrication process, shall be in accordance with the UL 3401 report of findings. The unique identifier of the construction method used shall match the identifier in the UL 3401 report of findings.
BM104.3 Additive manufacturing materials.¶
Only the listed additive manufacturing materials identified in the UL 3401 report of findings shall be used to fabricate the building structure or system components. Containers of the additive manufacturing materials shall be labeled.
BM104.4 Depositing of manufacturing materials.¶
Manufacturing materials shall only be deposited where ambient temperature and environmental conditions at the job site are within limits specified in the UL 3401 report of findings. The maximum number of layers permitted, specified curing time and any surface preparation or finishing shall be performed as specified in the UL 3401 report of findings.
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