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California contractor license
American Cleanroom Systems
American Cleanroom Systems of Rancho Santa Margarita holds California license 979883 (B General Building). The CSLB file dated Oct 29, 2026 lists it as active.1 It expires Jan 31, 2027.
Doing business as Cer Clean Rooms Inc.
Licensed 13 years, longer than 57% of 63 active Rancho Santa Margarita general contractors.
Active
- Workers' comp ends Dec 28, 2026 (60 days)
American Cleanroom Systems, Rancho Santa Margarita
- License
- 979883
- Class
- B General Building
- Expires
- Jan 31, 2027
- Bond
- $25,000
- Workers' comp
- Insured to Dec 28, 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
- $25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredHanover Insurance Company (The), from Dec 28, 2025, to Dec 28, 2026
Who is on this license?
- Officer
- Ana I. Espinoza RamosSince Jan 2, 2013
- CEO and president
- Anthony A. ChienSince Jan 2, 2013
- Responsible managing employee
- Charlie V. CastanedaSince May 16, 2013
What work does this license cover?
Issued Jan 2, 2013.
Which other Rancho Santa Margarita businesses hold B General Building?
What should you check before hiring?
What to ask before you hire
- Ask whether it has been renewed. Something on this license ends within 60 days. Check again before you pay a deposit.
- Get the license number in writing. The name on the license should match the name on your contract and invoice.
- Check the class covers the job. A license for one trade doesn't cover another. California license classes
- Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
- 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.
- 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
- Don't sign or pay a deposit until the CSLB shows the license active again.
- 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.
- If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
- Check another contractor. California license lookup
Sources
- CSLB License Master (cslb.ca.gov, Oct 29, 2026)
- Contractors State License Board (CSLB)