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California contractor license

Keystone Builds And More Inc

Keystone Builds And More Inc of Chino Hills holds California license 1136782 (B General Building, B2 Residential Remodeling, C10 Electrical, C16 Fire Protection, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C36 Plumbing). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Apr 30, 2027.

Active

Keystone Builds And More Inc, Chino Hills

License
1136782
Class
B General Building; B2 Residential Remodeling; C10 Electrical; C16 Fire Protection; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C36 Plumbing
Expires
Apr 30, 2027
Bond
$25,000
Workers' comp
Insured to Feb 13, 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
$25,000American Contractors Indemnity Company, from Apr 22, 2025, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredPie Insurance Company (The), from Feb 13, 2026, to Feb 13, 2027

Who is on this license?

Responsible managing officer
Fredy A. de Leon MirandaSince Apr 29, 2025
Responsible managing officer
Sea Yil OhSince Nov 19, 2025
CEO and president
Joseph K. YooSince Apr 29, 2025

What work does this license cover?

Issued Apr 29, 2025.

Which other Chino Hills 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, Nov 1, 2026)
  2. Contractors State License Board (CSLB)