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California contractor license

Diamond Petroleum Services Inc

Diamond Petroleum Services Inc of Antioch holds California license 1005444 (A General Engineering, D40). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Aug 31, 2027.

Licensed 11 years, longer than 75% of 120 active Antioch general contractors.

Active

Diamond Petroleum Services Inc, Antioch

License
1005444
Class
A General Engineering; D40
Expires
Aug 31, 2027
Bond
$25,000
Workers' comp
Insured to Jul 21, 2027

CSLB file dated Nov 1, 2026

From the CSLB file dated Nov 1, 2026. Not a consumer report; check the board before you hire.

Has the board taken action on this license?

None in the CSLB file dated Nov 1, 2026. Confirm with the board: CSLB license check

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

Bond
$25,000Atlantic Specialty Insurance Company, from Aug 21, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Jul 21, 2017, to Jul 21, 2027

Who is on this license?

Responsible managing officer
Guadalupe R. SanchezSince Jul 11, 2015

What work does this license cover?

Issued Jul 11, 2015. Reissued Aug 27, 2015.

Which other Antioch businesses hold A General Engineering?

General Contractors in AntiochCalifornia general 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, Nov 1, 2026)
  2. Contractors State License Board (CSLB)