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California contractor license
Allison-Sierra Inc
Allison-Sierra Inc of Mariposa holds California license 507261 (A General Engineering, C57 Well Drilling, HAZ Hazardous Substance Removal Certification). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Mar 31, 2027.
Licensed 39 years, longer than 78% of 28 active Mariposa general contractors.
Active
Allison-Sierra Inc, Mariposa
- License
- 507261
- Class
- A General Engineering; C57 Well Drilling; HAZ Hazardous Substance Removal Certification
- Expires
- Mar 31, 2027
- Bond
- $25,000
- Workers' comp
- Employee leasing to Oct 1, 2027
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
- $25,000Nationwide Mutual Insurance Company, from Jan 1, 2023, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- Employee leasingAce American Insurance Company, from Oct 1, 2026, to Oct 1, 2027
Who is on this license?
- Responsible managing officer, CEO and president
- Steven P. AllisonSince Mar 13, 1987
What work does this license cover?
Issued Mar 13, 1987.
- A General Engineering
- C57 Well Drilling
- HAZ Hazardous Substance Removal Certification
Which other Mariposa businesses hold A General Engineering?
- Lawson ConstructionLicensed since 1981
- Williams Excavation IncLicensed since 1983
- Mariposa Tank IncLicensed since 1991
- B & V ExcavatingLicensed since 1996
- Pearson Excavating IncLicensed since 2009
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)