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California contractor license

B C McCosker Construction Inc

B C McCosker Construction Inc of Concord holds California license 636659 (A General Engineering, B General Building). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Jan 31, 2028.

Licensed 34 years, longer than 88% of 323 active Concord general contractors.

Active

B C McCosker Construction Inc, Concord

License
636659
Class
A General Engineering; B General Building
Expires
Jan 31, 2028
Bond
$25,000
Workers' comp
Insured to Apr 1, 2027

CSLB file dated Oct 30, 2026

From the CSLB file dated Oct 30, 2026. Not a consumer report; check the board before you hire.

Has the board taken action on this license?

None in the CSLB file dated Oct 30, 2026. Confirm with the board: CSLB license check

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

Bond
$25,000Contractors Bonding And Insurance Company, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredArch Insurance Company, from Apr 1, 2026, to Apr 1, 2027

Who is on this license?

Officer
Eric R. McCoskerSince Aug 23, 2019
Officer
Douglas P. GriffithSince Dec 15, 2020
Responsible managing officer, CEO and president
Brian C. Mc CoskerSince Jan 25, 1992
CEO and president
Nicholaus D. NorthernSince May 11, 2026

What work does this license cover?

Issued Jan 25, 1992.

Which other Concord businesses hold A General Engineering?

General Contractors in ConcordCalifornia general 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 30, 2026)
  2. Contractors State License Board (CSLB)