Duff & Sons Inc
Mammoth Lakes · Mono County · CA
VERIFIED
Bestopedia verdict
California’s contractor board lists Duff & Sons Inc in CLEAR standing. A contractor bond is on file, and workers’ compensation coverage is current.
- License standing
- 30 / 30
- Years licensed
- 6.4 / 20
- Contractor bond
- 20 / 20
- Workers' comp
- 16 / 20
- Business structure
- 10 / 10
The verified record
- CSLB license
- #1063434 verify on CSLB ↗
- Classifications
- B, C-10
- Years licensed
- 6.4 years since 02/18/2020
- Contractor bond
- $25,000 AMERICAN CONTRACTORS INDEMNITY COMPANY
- Workers’ comp
- Current
- Business type
- Corporation
- Qualifying principal
- Grant Kelly Ii Duff
- Address of record
- P O Box 1387, Mammoth Lakes, CA 93546
Frequently Asked Questions
Is Duff & Sons Inc a licensed Electrical contractor in California?
Yes. Duff & Sons Inc holds California CSLB contractor license #1063434 with a C-10 (Electrical) classification. Current CSLB status: CLEAR.
What work is Duff & Sons Inc licensed to perform?
License #1063434 carries C-10 (Electrical), plus additional classifications: B.
Is Duff & Sons Inc bonded?
Yes. Duff & Sons Inc carries contractor's bond #100740955 for $25,000 through AMERICAN CONTRACTORS INDEMNITY COMPANY.
Does Duff & Sons Inc carry workers' compensation insurance?
Workers' compensation status on file: Exempt.
How long has Duff & Sons Inc held its contractor license?
License #1063434 was originally issued on 02/18/2020, approximately 6 years ago (as of July 2026).
Where is Duff & Sons Inc located?
Duff & Sons Inc is based in Mammoth Lakes, Mono County, CA 93546.