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California contractor license

THLC Corporation

THLC Corporation of Diamond Bar holds California license 1077041 (B General Building, C10 Electrical, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C36 Plumbing, C38 Refrigeration). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Jun 30, 2027.

Active

THLC Corporation, Diamond Bar

License
1077041
Class
B General Building; C10 Electrical; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C36 Plumbing; C38 Refrigeration
Expires
Jun 30, 2027
Bond
$25,000
Workers' comp
Insured to Oct 9, 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 Sep 16, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Nov 26, 2023, to Oct 9, 2027

Who is on this license?

Responsible managing officer
Yoon D. LeeSince Jun 16, 2021
CEO and president
Thomas H. LeeSince Jun 16, 2021

What work does this license cover?

Issued Jun 16, 2021.

Which other Diamond Bar businesses hold B General Building?

California electrical contractorsCalifornia plumbing 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 30, 2026)
  2. Contractors State License Board (CSLB)