License is active
Source: Contractors State License Board (CSLB)
Licensed
Current and in good standing
Bonded
$25,000 surety bond
Insured
Workers' comp coverage on file
Clean record
No complaints or disciplinary actions
Hiring this contractor?
Get alerts if their license status changes.
You're monitoring this license!
We'll email you if the license status, bond, or complaint history changes.
Something went wrong
Is this your business?
Claim your profile to manage your listing.
Claim request submitted!
We'll be in touch at the email you provided to verify your identity.
Something went wrong
SANDSTONE ENVIRONMENTAL ENGINEERING INC
- License Number
- 878348
- State
- California
- Status
- active
- Business Type
- Corporation
- Address
- PO BOX 1049 OAKLEY, CA, 94561 Contra Costa County
- Phone
- (510) 334 7932
License Dates
Issued
05/24/2006
Expires
07/31/2026
Expires in 4 months — verify renewal before long contracts
Reissued
07/27/2018
CSLB Last Updated
09/26/2025
Personnel & Officers
CASTILLO MARTIN
Responsible Managing Officer/Chief Executive Officer/President
Contractor Bond
Amount: $25,000
Company: WESTERN SURETY COMPANY
Bond #66985704
Effective: 07/27/2024
Workers' Compensation
Carrier: STATE COMPENSATION INSURANCE FUND
Policy #1972485
Effective: 07/26/2025
Expires: 07/26/2026
CSLB designation: Workers' Compensation Insurance
Complaints & Disciplinary History
This reflects CSLB's bulk license data. For detailed complaint history including pending investigations, check the official CSLB record.
Building Permits
Source: LA City Open Data (LADBS)
otc alterations permit
155 Gardenside Dr, 94131
drainage and waterproofing improvements at the back of the buildilng to protect rear wall foundation
$250,000
2015-08-14
demolitions
1490 Ocean Av, 94112
demolition of 1-story gas station.
$7,111
2015-07-09
Verify this record on the official state licensing board
View on Contractors State License Board (CSLB) →Learn how to verify contractor licenses in California
California licensing guide →Data sourced from official state licensing board records. Always confirm critical information directly with the state board.
Verify Another Contractor
Homeowner Resources
Other Licensed A| ASB| B| C21| C22| HAZ in OAKLEY
STEALTH LEAK SPECIALISTS INC
License #1000016 · CA
HOLDAWAY CONSTRUCTION
License #1003766 · CA
ON THE ROCK CONSTRUCTION INC
License #1003810 · CA
RB HANDYMAN SERVICES
License #1003881 · CA
HARVEY MICHAEL LOREN CONSTRUCTION
MICHAEL LOREN HARVEY CONSTRUCTION
License #1004468 · CA