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California contractor license

Deng's Plumbing Inc

Deng's Plumbing Inc of San Francisco holds California license 636742 (C36 Plumbing). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Apr 30, 2028.

Licensed 34 years, longer than 89% of 249 active San Francisco plumbing contractors.

Active

Deng's Plumbing Inc, San Francisco

License
636742
Class
C36 Plumbing
Expires
Apr 30, 2028
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
$25,000Western Surety Company, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Jan 1, 2013, to Jan 1, 2027

Who is on this license?

Responsible managing officer, CEO and president
Denis W. DengSince Jan 25, 1992

What work does this license cover?

Issued Jan 25, 1992. Reissued Apr 26, 2004.

Which other San Francisco businesses hold C36 Plumbing?

Plumbing Contractors in San FranciscoCalifornia 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)