Duff Co
Verified against CSLB on · View on CSLB
License details
- License number
- 742203
- License term on file
- November 4, 1997 – November 30, 2027
Business
- (916) 698 2227 (CSLB public record)
- 400 CANTERBURY COURT, Ione, CA 95640Amador County
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What to check next
Frequently asked questions
Is Duff Co licensed in California?
Yes. Duff Co holds an active California state contractor license (CSLB #742203), verified against the CSLB public record on September 28, 2026.
What is Duff Co's CSLB license number?
Duff Co's California contractor license number is 742203. 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 Co licensed for?
Duff Co is classified under General Engineering (A) and Construction Zone Traffic Control (C-31) by the CSLB.
How do I verify Duff Co's license myself?
Look up license #742203 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 September 28, 2026.
Verify it yourself: How to verify a California contractor license · Look up #742203 on CSLB
See an error in this record? Report incorrect information. Status reflects CSLB data as of the date shown above.