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California contractor license

Block12 Construction

Block12 Construction of San Francisco holds California license 1033146 (B General Building). The CSLB file dated Oct 26, 2026 lists it as active.1 It expires Feb 29, 2028.

Active

Block12 Construction, San Francisco

License
1033146
Class
B General Building
Expires
Feb 29, 2028
Bond
$25,000
Workers' comp
Insured to Jun 20, 2027

CSLB file dated Oct 26, 2026

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

Issued Nov 20, 2017.

Bond
$25,000North River Insurance Company (The), from Dec 3, 2024, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredInsurance Company Of The West, from Jun 20, 2026, to Jun 20, 2027

What work does this license cover?

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 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 26, 2026)
  2. Contractors State License Board (CSLB)