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California contractor license

Crystal Construction Clean Up Services

Crystal Construction Clean Up Services of Livermore holds California license 1146430 (D63). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Nov 30, 2027.

Doing business as Crystal Maintenance Inc.

Active

Crystal Construction Clean Up Services, Livermore

License
1146430
Class
D63
Expires
Nov 30, 2027
Bond
$25,000
Workers' comp
Insured to Jan 18, 2027

CSLB file dated Oct 30, 2026

From the CSLB file dated Oct 30, 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 Oct 30, 2026. Confirm with the board: CSLB license check

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

Bond
$25,000American Contractors Indemnity Company, from Oct 30, 2025, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Jan 18, 2025, to Jan 18, 2027

Who is on this license?

Officer
Jesus DiazSince Nov 18, 2025
Responsible managing officer
Mauricio Diaz-PerezSince Nov 18, 2025
CEO and president
Mauricio DiazSince Nov 18, 2025

What work does this license cover?

Issued Nov 18, 2025.

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 30, 2026)
  2. Contractors State License Board (CSLB)