Skip to content
State files updated Nov 1, 2026
Look up a contractor
MenuClose

Home / License lookup / California / Yum's Mechanical Co Inc

California contractor license

Yum's Mechanical Co Inc

Yum's Mechanical Co Inc of San Francisco holds California license 583839 (C4 Boiler, Hot Water Heating and Steam Fitting, C10 Electrical, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C43 Sheet Metal). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Dec 31, 2027.

Licensed 36 years, longer than 90% of 323 active San Francisco electrical contractors.

Active

Yum's Mechanical Co Inc, San Francisco

License
583839
Class
C4 Boiler, Hot Water Heating and Steam Fitting; C10 Electrical; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C43 Sheet Metal
Expires
Dec 31, 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
$25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredOmaha National Casualty Company, from Jan 1, 2026, to Jan 1, 2027

Who is on this license?

Officer
Brenda Y. JungSince Dec 29, 1989
Officer
Park H. JungSince Nov 3, 2003
Officer
Parkin JungSince Nov 3, 2003
Responsible managing officer, CEO and president
Kwok Y. JungSince Dec 29, 1989

What work does this license cover?

Issued Dec 29, 1989.

Which other San Francisco businesses hold C4 Boiler, Hot Water Heating and Steam Fitting?

Electrical Contractors in San FranciscoCalifornia 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)