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California contractor license

Royal Roofing Construction Co

Royal Roofing Construction Co of Placentia holds California license 678705 (B General Building, C33 Painting and Decorating). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Jan 31, 2027.

Doing business as Osscim Inc.

Licensed 33 years, longer than 80% of 95 active Placentia general contractors.

Active

Royal Roofing Construction Co, Placentia

License
678705
Class
B General Building; C33 Painting and Decorating
Expires
Jan 31, 2027
Bond
$25,000
Workers' comp
Exempt

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
$25,000Philadelphia Indemnity Insurance Company, from Sep 9, 2026, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
Exemptfrom Dec 16, 2024

Who is on this license?

Officer
Jason A. CimarustiSince Jan 17, 2014
Officer
Robert C. OssenbergSince Apr 22, 2014
Officer
Rosalio R. GonzalezSince Oct 17, 2014
Officer
Juan A. CerenilSince Dec 3, 2014
Officer
Raul MarquezSince Mar 10, 2015
Officer
Carlos M. ChavezSince Jul 30, 2015
Responsible managing officer, CEO and president
Ronald H. OssenbergSince Jan 26, 1995

What work does this license cover?

Issued Oct 12, 1993. Reissued Jan 26, 1995.

The workers' comp exemption means the holder told the CSLB it has no employees. If a crew works on your job, ask for a workers' comp certificate.

Which other Placentia businesses hold B General Building?

California 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)