The Board clarified what work requires the C-47 Manufactured Housing classification.
Only when you are installing a manufactured home or preparing the structure for moving do you need the C-47 classification. Contractors performing a single trade after the structure has already been installed only need the appropriate C specialty trade classification e.g. if installing/replacing/servicing an HVAC system in a manufactured home (or any structure), you need the C-20 classification, not both the C-20 and C-47.
You can read the CSLB Industry Bulletin here: https://www.cslb.ca.gov/Resources/IndustryBulletins/2024/24-03%20-%20Manufactured%20Homes.pdf
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