Contractor · Mammoth Lakes, Mono County
Duff & Sons INC
California contractor license · licensed since 2020 (6 years).
✓ Status CLEAR✓ Checked Oct 27, 2026✓ Facts from CSLB License Master
About this record
This page shows what the Contractors State License Board publishes in the License Master about license #1063434. Classifications: B · General Building, C10 · Electrical. Phone is from the CSLB file. We do not recommend or refer. Status can change after our check date; the official CSLB Instant License Check is the source of truth.
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