California contractor license
RALPH HOLDEN & CO
- A General Engineering
- B General Building
- C10 Electrical
- C16 Fire Protection
- C20 Warm-Air Heating, Ventilating And Air-Conditioning
- C36 Plumbing
- C57 Well Drilling
RALPH HOLDEN & CO is a contractor with 7 license classifications, including A General Engineering and B General Building, in Healdsburg, Sonoma County, licensed in California for 51 years (since 1975). As of Jun 23, 2026, the license is active with an expiration date of Aug 31, 2026 on record and a license bond is on file.
RALPH HOLDEN & COA General Engineering · B General Building · C10 Electrical · C16 Fire Protection · C20 Warm-Air Heating, Ventilating And Air-Conditioning · C36 Plumbing · C57 Well Drilling · checked Jun 23, 2026
ActiveLicense number#307640
Licensed sinceJul 1, 1975
Years licensed51 years
Expiration on recordAug 31, 2026
City and countyHealdsburg, Sonoma County
License bondOn file
ProjectsNone on file
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Source: California Contractors State License Board (CSLB) and City of Los Angeles permit records. Last updated Jun 23, 2026.