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California contractor license

Royal Service Air Conditioning Corporation

Royal Service Air Conditioning Corporation of San Gabriel holds California license 505938 (B General Building, C10 Electrical, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C38 Refrigeration). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Feb 28, 2027.

Licensed 39 years, longer than 96% of 25 active San Gabriel electrical contractors.

Active

Royal Service Air Conditioning Corporation, San Gabriel

License
505938
Class
B General Building; C10 Electrical; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C38 Refrigeration
Expires
Feb 28, 2027
Bond
$25,000
Workers' comp
Insured to Jan 1, 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 24, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredInsurance Company Of The West, from Jan 1, 2026, to Jan 1, 2027

Who is on this license?

Responsible managing officer, CEO and president
Kenneth S. YuSince Feb 20, 1987

What work does this license cover?

Issued Feb 20, 1987.

Which other San Gabriel businesses hold B General Building?

California electrical contractorsCalifornia HVAC 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)