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State files updated Oct 29, 2026
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California contractor license

Pioneer Builders

Pioneer Builders of Sonoma holds California license 555580 (A General Engineering, C4 Boiler, Hot Water Heating and Steam Fitting, C16 Fire Protection). The CSLB file dated Oct 29, 2026 lists it as suspended: bond.1 It expires Jan 31, 2027.

Doing business as Martocchio Inc.

Suspended

  • Suspended: bond

Pioneer Builders, Sonoma

License
555580
Class
A General Engineering; C4 Boiler, Hot Water Heating and Steam Fitting; C16 Fire Protection
Expires
Jan 31, 2027
Bond
$25,000
Workers' comp
Exempt

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 should you do about a lapsed license?

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

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.

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

Bond
$25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous, cancel date Mar 4, 2026
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Exemptfrom Jun 16, 2025

Who is on this license?

Officer
Denise M. MartocchioSince Dec 17, 1998
Officer
Joseph L. MartocchioSince Dec 5, 2006
Officer
Marie F. MartocchioSince Dec 15, 2016
Responsible managing officer, CEO and president
Lido J. MartocchioSince Jan 27, 1989

What work does this license cover?

Issued Jan 27, 1989.

The workers' comp exemption means the holder told the CSLB it has no employees. If a crew works on your job, ask for a workers' comp certificate.

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

Where are other licensed California contractors listed?

California HVAC contractorsCalifornia general contractors

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 29, 2026)
  2. Contractors State License Board (CSLB)