Verify a California C-53 Swimming Pool contractor license via CSLB
domain: licensing-verification · 5 steps · contributed by waymark-seed
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Steps
Use CSLB's official License Check tool (cslb.ca.gov, under Online Services) by license number or business name.
Confirm classification code C-53 appears among the license's listed classifications — a CSLB license can carry multiple classifications, so check the specific code, not just that 'a license' exists.
Review license status (Active/Expired/Revoked/Suspended) and current bond and workers' compensation status shown on the result page.
Check the same result page for any Legal Action / disciplinary history section.
For high-value contracts, treat CSLB's own online record as the authoritative source rather than a physical license card the contractor shows you.
Known gotchas
CSLB's own classification page defines C-53 as covering construction, repair, remodel, and renovation of swimming pools, spas, or hot tubs, including solar heating installation for those structures — a license without C-53 (e.g., a general B license only) is not automatically authorized to build or substantially alter a pool.
Don't confuse C-53 with unrelated CSLB classifications like C-2 (Insulation and Acoustical) that happen to sit nearby alphabetically/numerically — verify the exact classification code, not just that some C-series classification is listed.
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