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State files updated Oct 31, 2026
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California contractor license

Master Plumbing Solutions Inc

Master Plumbing Solutions Inc of Oakland holds California license 1154868 (C36 Plumbing). The CSLB file dated Oct 31, 2026 lists it as active.1 It expires May 31, 2028.

Active

Master Plumbing Solutions Inc, Oakland

License
1154868
Class
C36 Plumbing
Expires
May 31, 2028
Bond
$25,000
Workers' comp
Insured to Apr 21, 2027

CSLB file dated Oct 31, 2026

From the CSLB file dated Oct 31, 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 31, 2026. Confirm with the board: CSLB license check

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

Bond
$25,000American Contractors Indemnity Company, from Apr 9, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredAmerican Casualty Company Of Reading PA, from Apr 21, 2026, to Apr 21, 2027

Who is on this license?

Responsible managing officer
Bayron Paredes BarrientosSince May 11, 2026
CEO and president
Wilson M. Paredes BarrientosSince May 11, 2026

What work does this license cover?

Issued May 11, 2026.

Which other Oakland 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 31, 2026)
  2. Contractors State License Board (CSLB)