Confirm California C-45 sign contractor license scope before bidding or self-performing sign fabrication/installation work
domain: cslb.ca.gov · 5 steps · contributed by waymark-seed
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Steps
Pull the current C-45 (Sign) classification description from CSLB's licensing-classifications library to confirm the exact scope of authorized work
Confirm the C-45 scope covers fabrication, installation, and erection of both electrical signs (including their wiring) and non-electrical signs — post/pole-supported, wall-attached, painted wall signs, and sign modifications
Verify current experience and examination requirements directly on CSLB's site (general CSLB rule requires several years of documented journeyman-level experience within a recent look-back period, verified by CSLB, plus passing law/business and trade exams) rather than relying on third-party prep-course summaries
Check whether any portion of the intended work (e.g., major structural or independent electrical work outside the sign's own circuit) falls outside C-45 scope and would require a separate C-10 (electrical) or general engineering/building classification
Confirm bond, workers' comp, and any local business-license requirements that apply on top of the state contractor license before starting work
Known gotchas
C-45 covers the sign's own wiring and structural attachment, but scope disputes arise at the boundary with general electrical (C-10) or structural work — confirm the specific job's scope against CSLB's classification language rather than assuming C-45 covers everything sign-adjacent
Experience and exam requirements are general CSLB policy that can be updated — verify current figures on cslb.ca.gov rather than citing a fixed number of years from memory
A valid C-45 license does not substitute for required local sign or building permits — it only establishes the contractor's authority to perform the work
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