Skip to content
State files updated Oct 30, 2026
Look up a contractor
MenuClose

Home / License lookup / California / Sitz Plumbing Inc

California contractor license

Sitz Plumbing Inc

Sitz Plumbing Inc of Lakeside holds California license 790096 (C36 Plumbing). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Aug 31, 2028.

Licensed 25 years, longer than 70% of 20 active Lakeside plumbing contractors.

Active

Sitz Plumbing Inc, Lakeside

  • Bond has a cancellation date on file: Nov 26, 2026.
License
790096
Class
C36 Plumbing
Expires
Aug 31, 2028
Bond
$25,000
Workers' comp
Insured to Apr 11, 2027

CSLB file dated Oct 30, 2026

From the CSLB file dated Oct 30, 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 Oct 30, 2026. Confirm with the board: CSLB license check

What bond, insurance and workers' comp are on file?

Bond
$25,000Jet Insurance Company, from Oct 25, 2024, continuous, cancel date Nov 26, 2026
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredAmtrust Insurance Company, from Apr 11, 2026, to Apr 11, 2027

Who is on this license?

Officer
Diane T. SitzSince Aug 23, 2006
Responsible managing officer, CEO and president
Thomas R. SitzSince Jan 18, 2001

What work does this license cover?

Issued Jan 18, 2001. Reissued Aug 23, 2006.

A cancellation date is on file for a bond or policy. Ask for a current certificate before work starts.

Which other Lakeside businesses hold C36 Plumbing?

California 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, Oct 30, 2026)
  2. Contractors State License Board (CSLB)