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California contractor license

Cornerstone Earth Group Inc

Cornerstone Earth Group Inc of Sunnyvale holds California license 905816 (A General Engineering, HAZ Hazardous Substance Removal Certification). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Oct 31, 2027.

Licensed 19 years, longer than 81% of 137 active Sunnyvale general contractors.

Active

  • Workers' comp ends Dec 20, 2026 (51 days)

Cornerstone Earth Group Inc, Sunnyvale

License
905816
Class
A General Engineering; HAZ Hazardous Substance Removal Certification
Expires
Oct 31, 2027
Bond
$25,000
Workers' comp
Insured to Dec 20, 2026

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
$25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredHartford Casualty Insurance Company, from Dec 20, 2025, to Dec 20, 2026

Who is on this license?

Responsible managing officer
Ronnie L. HelmSince Oct 30, 2007

What work does this license cover?

Issued Oct 30, 2007.

Which other Sunnyvale businesses hold A General Engineering?

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