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California contractor license
Ongaro & Sons
Ongaro & Sons of Petaluma holds California license 215233 (C4 Boiler, Hot Water Heating and Steam Fitting, C10 Electrical, C16 Fire Protection, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C34 Pipeline, C36 Plumbing, C39 Roofing, C42 Sanitation System, C43 Sheet Metal, C60 Welding, D21). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Jan 31, 2028.
Doing business as Ongaro Ernest & Sons Inc.
Licensed 63 years, longer than 98% of 56 active Petaluma electrical contractors.
Active
Ongaro & Sons, Petaluma
- License
- 215233
- Class
- C4 Boiler, Hot Water Heating and Steam Fitting; C10 Electrical; C16 Fire Protection; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C34 Pipeline; C36 Plumbing; C39 Roofing; C42 Sanitation System; C43 Sheet Metal; C60 Welding; D21
- Expires
- Jan 31, 2028
- Bond
- $25,000
- Workers' comp
- Insured to Oct 1, 2027
CSLB file dated Oct 29, 2026
From the CSLB file dated Oct 29, 2026. Not a consumer report; check the board before you hire.
What bond, insurance and workers' comp are on file?
- Bond
- $25,000Merchants Bonding Company (Mutual), from Oct 18, 2024, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredAmtrust Insurance Company, from Oct 1, 2026, to Oct 1, 2027
Who is on this license?
- Officer
- Dean M. OngaroSince Jan 28, 1994
- Officer
- Paul M. OngaroSince Jan 28, 1994
- Officer
- Mitchell A. OngaroSince Jan 31, 1996
- Responsible managing officer
- Ernest J. OngaroSince Jul 6, 1992
- Responsible managing employee
- Jason A. DimasSince Jan 29, 2025
What work does this license cover?
Issued Feb 13, 1963.
- C4 Boiler, Hot Water Heating and Steam Fitting
- C10 Electrical
- C16 Fire Protection
- C20 Warm-Air Heating, Ventilating and Air-Conditioning
- C34 Pipeline
- C36 Plumbing
- C39 Roofing
- C42 Sanitation System
- C43 Sheet Metal
- C60 Welding
- D21
Which other Petaluma businesses hold C4 Boiler, Hot Water Heating and Steam Fitting?
California electrical contractorsCalifornia plumbing contractors
What should you check before hiring?
What to ask before you hire
- Get the license number in writing. The name on the license should match the name on your contract and invoice.
- Check the class covers the job. A license for one trade doesn't cover another. California license classes
- Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
- 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.
- 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
- Don't sign or pay a deposit until the CSLB shows the license active again.
- 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.
- If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
- Check another contractor. California license lookup
Sources
- CSLB License Master (cslb.ca.gov, Oct 29, 2026)
- Contractors State License Board (CSLB)