contracting businessc36 plumbingLicensed since 2026
Interlock Plumbing
4045 Rockford Dr, Antioch, CA 94509 · map
What the public record says
- Licensed since 2026
- $25,000 contractor bond
- Carries workers' compensation (has employees)
- Classifications: C4, C36
- Owned by a corporation
Licenses and permits
- C4 classificationCA Contractors State License Board · #1149890 · since 2026
- C-36 PlumbingCA Contractors State License Board · #1149890 · since 2026
Estimated value
Fair$217K – $534K
Based on the license record looking like a licensed shop carrying workers' comp (a small crew); businesses like that typically bill around $900,000 a year. At a typical 16% owner margin and 2.61x multiple for contractors.
Estimate, not an appraisal. How we value
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Record built from 1 public file. Updated 11/7/2026. Own this business? Claim the page or ask for a change.
Estimated value
Fair$217K – $534K
Based on the license record looking like a licensed shop carrying workers' comp (a small crew); businesses like that typically bill around $900,000 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