Skip to content
State files updated Oct 30, 2026
Look up a contractor
MenuClose

Home / License lookup / California / Sentinel Environmental Solutions Inc

California contractor license

Sentinel Environmental Solutions Inc

Sentinel Environmental Solutions Inc of Simi Valley holds California license 986301 (B General Building). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Feb 29, 2028.

Licensed 13 years, longer than 51% of 288 active Simi Valley general contractors.

Active

  • Workers' comp ends Dec 5, 2026 (36 days)

Sentinel Environmental Solutions Inc, Simi Valley

License
986301
Class
B General Building
Expires
Feb 29, 2028
Bond
$25,000
Workers' comp
Insured to Dec 5, 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
InsuredCompwest Insurance Co, from Dec 5, 2024, to Dec 5, 2026

Who is on this license?

Responsible managing officer
Daniel J. TreptowSince Aug 24, 2013
CEO and president
Karen E. KleinfeldSince Feb 27, 2014

What work does this license cover?

Issued Aug 24, 2013. Reissued Feb 27, 2014.

Which other Simi Valley businesses hold B General Building?

General Contractors in Simi ValleyCalifornia 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)