PROSTONE SERVICES
License
- Status
- CLEAR
- First issued
- November 1, 2010
- Expires
- November 30, 2026
- Entity
- Corporation
- Address of record
- 1190 MTN VIEW-ALVISO RD STE M, Sunnyvale, CA 94089
- Phone of record
- (650) 593 6285
Contractor bond
- Surety
- ATLANTIC SPECIALTY INSURANCE COMPANY
- Bond number
- 800272064
- Amount
- $25,000
- Effective
- September 1, 2026
Workers’ compensation
- Carrier
- PIE INSURANCE COMPANY (THE)
- Policy number
- WCPI1044867002
- Effective
- May 5, 2026
- Expires
- May 5, 2027
Are they licensed for your job?
A California contractor may only contract for work their classification covers. Pick the job and this reads the license on file against it.
Licensed to perform
A contractor may only contract for work within their classifications. See all 7 licensed ceramic and mosaic tile contractors in Sunnyvale.
People on this license
| Name | Title | Since | Through |
|---|---|---|---|
| ONG ALBERT | Responsible Managing Officer/Chief Executive Officer/President | November 1, 2010 | Current |
| ONG JOHNATHAN KURNIAWAN | Chief Executive Officer/President | February 13, 2025 | Current |
| ONG SHANNON KURLIAWAN | Officer | November 1, 2010 | Current |
Verified status badge
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<img src="https://bookofbuilders.com/badge/954056.svg" alt="PROSTONE SERVICES — California contractor license #954056 status, verified against CSLB records" width="268" height="76">
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Source: California Contractors State License Board public records. Coverage lapse is evaluated against today’s date; all other fields reflect the latest weekly CSLB file. Confirm at the CSLB’s official record before signing a contract.