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California contractor license
M S Mechanical Service Inc
M S Mechanical Service Inc of Montebello holds California license 899875 (C20 Warm-Air Heating, Ventilating and Air-Conditioning). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Sep 30, 2027.
Licensed 19 years, longer than 66% of 7,757 active California HVAC contractors.
Active
M S Mechanical Service Inc, Montebello
- License
- 899875
- Class
- C20 Warm-Air Heating, Ventilating and Air-Conditioning
- Expires
- Sep 30, 2027
- Bond
- $25,000
- Workers' comp
- Insured to Mar 25, 2027
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
- $25,000Arch Insurance Company, from Sep 13, 2023, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredBerkshire Hathaway Direct Insurance Company, from Mar 25, 2026, to Mar 25, 2027
Who is on this license?
- Responsible managing officer, CEO and president
- Eduardo MartinezSince Jul 11, 2007
What work does this license cover?
Issued Jul 11, 2007. Inactive Jul 11, 2007 to Sep 1, 2011. Reissued Sep 26, 2013.
Which other Montebello businesses hold C20 Warm-Air Heating, Ventilating and Air-Conditioning?
- Western Indoor Environmental ServicesLicensed since 2015
- Alpine MFG Group IncorporatedLicensed since 2015
- Alturas Heating Ventilation & Air ConditioningLicensed since 2017
- L A C Heating & Air LLCLicensed since 2020
- E & G Air Conditioning IncLicensed 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)