Clear
Y K MASON & SONS INC
License
- Status
- CLEAR
- First issued
- February 17, 2015
- Reissued
- May 6, 2019
- Expires
- May 31, 2027
- Entity
- Corporation
- Address of record
- P O BOX 34246, San Francisco, CA 94134
- Phone of record
- (415) 467 1788
Contractor bond
- Surety
- MERCHANTS BONDING COMPANY (MUTUAL)
- Bond number
- 101869742
- Amount
- $25,000
- Effective
- May 6, 2026
Workers’ compensation
- Carrier
- ACE AMERICAN INSURANCE COMPANY
- Policy number
- C738997
- Effective
- June 1, 2026
- Expires
- June 1, 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 2,238 licensed general building contractors in San Francisco.
People on this license
| Name | Title | Since | Through |
|---|---|---|---|
| CHOW ALAN WEI-LUN | Responsible Managing Officer | May 6, 2019 | Current |
| CHOW YING KIN | Chief Executive Officer/President | May 6, 2019 | Current |
| CHOW ALAN WEI-LUN | Sole Owner | February 17, 2015 | May 6, 2019 |
Is this your license?
Claim this page to add your photos, description, service area and contact details. The state’s record above stays exactly as it is — claiming adds to a page, it never edits or hides anything the CSLB reports.
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.