Contractor License Proof

Hartvickson John D

Licensed

Verified against CSLB on · View on CSLB

License details

License number
409642
Status
Active
Classifications
C-20 · Warm-Air Heating, Ventilating and Air-Conditioning
Contractor bond
$25,000
Workers' comp
Covered
License term on file
July 29, 1981 – July 31, 2027

Business

  • (925) 687 1777 (CSLB public record)
  • 3741 JOAN AVENUE, Concord, CA 94521Contra Costa County

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Frequently asked questions

Is Hartvickson John D licensed in California?

Yes. Hartvickson John D holds an active California state contractor license (CSLB #409642), verified against the CSLB public record on June 17, 2026.

What is Hartvickson John D's CSLB license number?

Hartvickson John D's California contractor license number is 409642. You can verify it directly on the CSLB website: https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=409642

What kind of work is Hartvickson John D licensed for?

Hartvickson John D is classified under Warm-Air Heating, Ventilating and Air-Conditioning (C-20) by the CSLB.

How do I verify Hartvickson John D's license myself?

Look up license #409642 with the CSLB "Check a License" tool at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=409642. This page reflects the CSLB public record as of June 17, 2026.

See an error in this record? Report incorrect information. Status reflects CSLB data as of the date shown above.