Specialty (C) Contractor Classifications Guide
Specialty (C) classifications cover individual trades like electrical, plumbing, HVAC, and landscaping. Here is how they work.
Last reviewed July 22, 2026
What specialty classifications cover
Each C classification authorizes a specific trade. Examples include C-10 Electrical, C-36 Plumbing, C-20 HVAC, and C-27 Landscaping.
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Can I hold more than one classification?
Yes, contractors can add classifications by meeting the requirements for each. Confirm the process with CSLB.