Contractor License Proof

Duff & Sons Inc

Licensed

Verified against CSLB on · View on CSLB

License details

License number
1063434
Status
Active
Classifications
B · General BuildingC-10 · Electrical
Contractor bond
$25,000
Workers' comp
ExemptNo employees — not a red flag.
License term on file
February 18, 2020 – February 29, 2028

Business

  • (559) 731 8948 (CSLB public record)
  • P O BOX 1387, Mammoth Lakes, CA 93546Mono County

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Frequently asked questions

Is Duff & Sons Inc licensed in California?

Yes. Duff & Sons Inc holds an active California state contractor license (CSLB #1063434), verified against the CSLB public record on June 17, 2026.

What is Duff & Sons Inc's CSLB license number?

Duff & Sons Inc's California contractor license number is 1063434. Look that number up with the CSLB "Check a License" tool to confirm its current status against the public record yourself.

What kind of work is Duff & Sons Inc licensed for?

Duff & Sons Inc is classified under General Building (B) and Electrical (C-10) by the CSLB.

How do I verify Duff & Sons Inc's license myself?

Look up license #1063434 with the CSLB "Check a License" tool and compare the status, bond, and workers' compensation details against what's shown on this page. This page reflects the CSLB public record as of June 17, 2026.

Verify it yourself: How to verify a California contractor license · Look up #1063434 on CSLB

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See an error in this record? Report incorrect information. Status reflects CSLB data as of the date shown above.