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

Home / License lookup / California / Clark Harry Plumbing And Heating Inc

California contractor license

Clark Harry Plumbing And Heating Inc

Clark Harry Plumbing And Heating Inc of Oakland holds California license 792463 (C20 Warm-Air Heating, Ventilating and Air-Conditioning, C36 Plumbing, C42 Sanitation System). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Mar 31, 2027.

Licensed 25 years, longer than 76% of 65 active Oakland plumbing contractors.

Active

Clark Harry Plumbing And Heating Inc, Oakland

License
792463
Class
C20 Warm-Air Heating, Ventilating and Air-Conditioning; C36 Plumbing; C42 Sanitation System
Expires
Mar 31, 2027
Bond
$25,000
Workers' comp
Employee leasing to Apr 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 Dec 29, 2024, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Employee leasingAce American Insurance Company, from Apr 1, 2026, to Apr 1, 2027

Who is on this license?

Officer
Don A. MarshallSince Mar 14, 2001
Officer
Kathleen D. MarshallSince Mar 14, 2001
Responsible managing officer, CEO and president
Brad F. MarshallSince Mar 14, 2001

What work does this license cover?

Issued Mar 14, 2001.

Which other Oakland businesses hold C20 Warm-Air Heating, Ventilating and Air-Conditioning?

California plumbing 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)