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

Home / License lookup / California / Bonetti Frank Plumbing Inc

California contractor license

Bonetti Frank Plumbing Inc

Bonetti Frank Plumbing Inc of Castro Valley holds California license 251165 (C4 Boiler, Hot Water Heating and Steam Fitting, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C34 Pipeline, C36 Plumbing, C42 Sanitation System). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires May 31, 2028.

Licensed 58 years, longer than 99% of 9,564 active California plumbing contractors.

Active

Bonetti Frank Plumbing Inc, Castro Valley

License
251165
Class
C4 Boiler, Hot Water Heating and Steam Fitting; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C34 Pipeline; C36 Plumbing; C42 Sanitation System
Expires
May 31, 2028
Bond
$25,000
Workers' comp
Employee leasing to Aug 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
$25,000Atlantic Specialty Insurance Company, from Sep 1, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Employee leasingAce American Insurance Company, from Aug 1, 2026, to Aug 1, 2027

Who is on this license?

Officer
Daniel F. BonettiSince Apr 3, 1992
Officer
Michael R. BonettiSince Feb 14, 2022
Officer
Matthew R. BonettiSince Mar 14, 2022
Responsible managing officer
Raymond L. BonettiSince Jul 18, 1989

What work does this license cover?

Issued Dec 26, 1967.

Where are other licensed California contractors listed?

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)