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State files updated Oct 29, 2026
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California contractor license

McNulty Mechanical Incorporated

McNulty Mechanical Incorporated of Livermore holds California license 494419 (C4 Boiler, Hot Water Heating and Steam Fitting). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Jun 30, 2028.

Licensed 40 years, longer than 86% of 44 active Livermore HVAC contractors.

Active

McNulty Mechanical Incorporated, Livermore

License
494419
Class
C4 Boiler, Hot Water Heating and Steam Fitting
Expires
Jun 30, 2028
Bond
$25,000
Workers' comp
Insured to Aug 20, 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
$25,000Western Surety Company, from Nov 24, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredMarkel Insurance Company, from Aug 20, 2026, to Aug 20, 2027

Who is on this license?

Officer
Maureen M. CarbajalSince May 21, 2019
Responsible managing officer
William G. MaloneSince May 23, 2002
CEO and president
Steven M. WirthSince Oct 2, 2025

What work does this license cover?

Issued Jun 30, 1986.

Which other Livermore businesses hold C4 Boiler, Hot Water Heating and Steam Fitting?

California 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, Oct 29, 2026)
  2. Contractors State License Board (CSLB)