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California contractor license

Knittel Construction Inc

Knittel Construction Inc of Napa holds California license 501977 (B General Building, C36 Plumbing). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Mar 31, 2028.

Licensed 39 years, longer than 82% of 23 active Napa plumbing contractors.

Active

  • Workers' comp ends Nov 11, 2026 (13 days)

Knittel Construction Inc, Napa

License
501977
Class
B General Building; C36 Plumbing
Expires
Mar 31, 2028
Bond
$25,000
Workers' comp
Insured to Nov 11, 2026

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 Apr 28, 2025, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredEverest Premier Insurance Company, from Nov 11, 2025, to Nov 11, 2026

Who is on this license?

Responsible managing officer, CEO and president
Gregory S. KnittelSince Nov 25, 1986

What work does this license cover?

Issued Nov 25, 1986. Reissued Mar 31, 1994.

Which other Napa businesses hold B General Building?

California plumbing contractorsGeneral Contractors in NapaCalifornia general contractors

What should you check before hiring?

What to ask before you hire

  1. Ask whether it has been renewed. Something on this license ends within 60 days. Check again before you pay a deposit.
  2. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  3. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  4. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  5. 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.
  6. 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)