contracting businessc36 plumbingLicensed since 2011
Quintero Sergio
Sergio Quintero DBA R & Q Overhead Doors
3907 Folsom Dr, Antioch, CA 94531 · map
What the public record says
- Licensed since 2011 (15 years)
- $25,000 contractor bond
- Classifications: B, C36, D28
- Partnership
Licenses and permits
- B General BuildingCA Contractors State License Board · #958400 · since 2011
- C-36 PlumbingCA Contractors State License Board · #958400 · since 2011
- D28 classificationCA Contractors State License Board · #958400 · since 2011
Estimated value
Starting point$59K – $150K
Based on the license record looking like an owner-operator with no employees on the license; businesses like that typically bill around $250,000 a year. At a typical 16% owner margin and 2.61x multiple for contractors.
Estimate, not an appraisal. How we value
Tighten this with your numbersNearby hvac, plumbing & electrical
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- Tyndall HVAC INCAntioch · since 2004 · $236K–$579K
- M&n Enterprises INCAntioch · since 2013 · $217K–$534K
Record built from 1 public file. Updated 11/7/2026. Own this business? Claim the page or ask for a change.
Estimated value
Starting point$59K – $150K
Based on the license record looking like an owner-operator with no employees on the license; businesses like that typically bill around $250,000 a year. At a typical 16% owner margin and 2.61x multiple for contractors.
Estimate, not an appraisal. How we value
Tighten this with your numbers