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Cal Building Systems Inc

Cal Building Systems Inc of Yorba Linda holds California license 521087 (C7 Low Voltage Systems, C10 Electrical, C16 Fire Protection). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Nov 30, 2027.

Licensed 38 years, longer than 80% of 56 active Yorba Linda electrical contractors.

Active

Cal Building Systems Inc, Yorba Linda

License
521087
Class
C7 Low Voltage Systems; C10 Electrical; C16 Fire Protection
Expires
Nov 30, 2027
Bond
$25,000
Workers' comp
Insured to Jul 15, 2027

CSLB file dated Oct 29, 2026

From the CSLB file dated Oct 29, 2026. Not a consumer report; check the board before you hire.

What bond, insurance and workers' comp are on file?

Bond
$25,000American Contractors Indemnity Company, from Nov 30, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredNational Casualty Company, from Jul 15, 2026, to Jul 15, 2027

Who is on this license?

Responsible managing officer
John B. CalvinSince Nov 19, 1987
Responsible managing officer, CEO and president
John T. HasslerSince Nov 30, 2023

What work does this license cover?

Issued Nov 19, 1987. Inactive Dec 6, 1993 to Jan 25, 1995. Reissued Nov 30, 2023.

Which other Yorba Linda businesses hold C7 Low Voltage Systems?

California electrical contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
  5. Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.

If the license is lapsed

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 29, 2026)
  2. Contractors State License Board (CSLB)