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California contractor license
Diablo Molding & Trim
Diablo Molding & Trim of San Ramon holds California license 963110 (B General Building). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Dec 31, 2026.
Doing business as Red Square Builders Inc.
Licensed 15 years, longer than 56% of 90 active San Ramon general contractors.
Active
Diablo Molding & Trim, San Ramon
- Workers' comp on file ended Sep 26, 2026.
- License
- 963110
- Class
- B General Building
- Expires
- Dec 31, 2026
- Bond
- $25,000
- Workers' comp
- Insured to Sep 26, 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
- $25,000Atlantic Specialty Insurance Company, from Mar 10, 2026, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredEndurance Assurance Corporation, from Sep 26, 2025, to Sep 26, 2026
Who is on this license?
- Responsible managing officer, CEO and president
- Alex BluminSince Jul 11, 2011
What work does this license cover?
Issued Jul 11, 2011. Reissued Dec 2, 2016.
Which other San Ramon businesses hold B General Building?
- Brighton Coulson IncLicensed since 2009
- Ema Builders IncLicensed since 2009
- Home Remodelers Design & Build IncLicensed since 2012
- Hung Construction Builder IncLicensed since 2012
- K L Builders & Developers IncLicensed since 2018
What should you check before hiring?
What to ask before you hire
- 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 30, 2026)
- Contractors State License Board (CSLB)