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California contractor license

Caro Master Builders Inc

Caro Master Builders Inc of Oakland holds California license 646012 (B General Building, C10 Electrical, C36 Plumbing). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Nov 30, 2026.

Licensed 34 years, longer than 88% of 87 active Oakland electrical contractors.

Active

  • License ends Nov 30, 2026 (32 days)

Caro Master Builders Inc, Oakland

License
646012
Class
B General Building; C10 Electrical; C36 Plumbing
Expires
Nov 30, 2026
Bond
$25,000
Workers' comp
Insured to Aug 27, 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 Mar 7, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredAmerican Casualty Company Of Reading PA, from Aug 27, 2026, to Aug 27, 2027

Who is on this license?

Responsible managing officer, CEO and president
Ismael CaroSince May 23, 1992

What work does this license cover?

Issued May 23, 1992. Inactive Jul 11, 2022 to Nov 16, 2022. Reissued Mar 15, 2022.

Which other Oakland businesses hold B General Building?

California electrical contractorsCalifornia plumbing contractors

What should you check before hiring?

What to ask before you hire

  1. Ask whether it has been renewed. Something on this license ends within 60 days. Check again before you pay a deposit.
  2. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  3. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  4. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  5. 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.
  6. 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)