Updated: Jun 13, 2026
Location and Projects
Address
1856 Knox St, Castro Valley, CA, 94546
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Zielke Plumbing
Zielke Plumbing, 1856 Knox St, Castro Valley, CA (Owned by: Raul Adolfo Zielke) holds a Plumbing license and 1 other license according to the California license board.
Their BuildZoom score of 95 ranks in the top 22% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Zielke Plumbing, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Zielke Plumbing Services
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Zielke Plumbing Contact Information
Phone Number: (510) 727-9880
Address: 1856 Knox St, Castro Valley, CA 94546
This is a sample of this contractor's permits. Click here to access their complete permit history.
Li new gas line at front yard
Valuation:
$5,500
Permit #:
BPLB2021-0034
Status:
final
Fee:
$158
Permit Type:
N/A
Building Type:
N/A
Installation of earthquake shut off valve
Valuation:
N/A
Permit #:
B2019-00477
Status:
final
Fee:
$127
Permit Type:
N/A
Building Type:
N/A
Install 2-way cleanout replace sewer lateral & test
Valuation:
$3,500
Permit #:
SLR14-0079
Status:
final
Fee:
$230
Permit Type:
N/A
Building Type:
N/A
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Zielke Plumbing License info
Verified License
| License # | 973224 |
| Status | Active |
| State | California |
| Type | Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Zielke Plumbing at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1045809 |
| Status | Inactive |
| State | California |
| Type | Plumbing |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Zielke Plumbing at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
Insured
| Insurer | Atain Specialty Insurance Company |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Wesco Insurance Company |
| Bond Value | $15,000 |
Zielke Plumbing Employees
RZ
Raul Adolfo Zielke
Owner