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California contractor license
Guardian Firestop And Insulation LLC
Guardian Firestop And Insulation LLC of Livermore holds California license 1125232 (C2 Insulation and Acoustical). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Aug 31, 2028.
Active
Guardian Firestop And Insulation LLC, Livermore
- License
- 1125232
- Class
- C2 Insulation and Acoustical
- Expires
- Aug 31, 2028
- Bond
- $25,000
- Workers' comp
- Exempt
CSLB file dated Nov 1, 2026
From the CSLB file dated Nov 1, 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 Nov 1, 2026. Confirm with the board: CSLB license check
What bond, insurance and workers' comp are on file?
- Bond
- $25,000Western Surety Company, from Jul 26, 2024, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- Exemptfrom Sep 1, 2026
Who is on this license?
- Responsible managing officer
- Troy A. GeierSince Aug 16, 2024
- LLC member
- Donna L. GeierSince Aug 16, 2024
What work does this license cover?
Issued Aug 16, 2024.
- C2 Insulation and Acoustical
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 Livermore businesses hold C2 Insulation and Acoustical?
- Marina Mechanical ServicesLicensed since 1981
- L J Interiors IncLicensed since 1990
- Anthon IncorporatedLicensed since 2010
- Insultech Contracting LLCLicensed since 2023
- Blue Phoenix Contracting LLCLicensed since 2023
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, Nov 1, 2026)
- Contractors State License Board (CSLB)