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State files updated Oct 28, 2026
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California contractor license

Diamond Grading Inc

Diamond Grading Inc of Riverside holds California license 877432 (C12 Earthwork and Paving). The CSLB file dated Oct 28, 2026 lists it as active.1 It expires May 31, 2028.

Active

  • Workers' comp ends Dec 1, 2026 (34 days)

Diamond Grading Inc, Riverside

  • Bond has a cancellation date on file: Oct 31, 2026.
License
877432
Class
C12 Earthwork and Paving
Expires
May 31, 2028
Bond
$25,000
Workers' comp
Insured to Dec 1, 2026

CSLB file dated Oct 28, 2026

From the CSLB file dated Oct 28, 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 Jan 1, 2023, continuous, cancel date Oct 31, 2026
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredService American Indemnity Company, from Dec 1, 2025, to Dec 1, 2026

What work does this license cover?

Issued May 6, 2006.

A cancellation date is on file for a bond or policy. Ask for a current certificate before work starts.

Which other Riverside businesses hold C12 Earthwork and Paving?

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 28, 2026)
  2. Contractors State License Board (CSLB)