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California contractor license

Haffner Mechanical Systems

Haffner Mechanical Systems of San Diego holds California license 1023978 (C36 Plumbing). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Feb 28, 2027.

Licensed 9 years, longer than 51% of 308 active San Diego plumbing contractors.

Active

Haffner Mechanical Systems, San Diego

License
1023978
Class
C36 Plumbing
Expires
Feb 28, 2027
Bond
$25,000
Workers' comp
Insured to Mar 9, 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
$25,000North River Insurance Company (The), from Jan 6, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredTechnology Insurance Company Inc, from Mar 9, 2026, to Mar 9, 2027

Who is on this license?

Responsible managing officer, CEO and president
Andrew S. HaffnerSince Feb 22, 2017

What work does this license cover?

Issued Feb 22, 2017.

Which other San Diego businesses hold C36 Plumbing?

Plumbing Contractors in San DiegoCalifornia 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 29, 2026)
  2. Contractors State License Board (CSLB)