Updated: Apr 12, 2026
Location and Projects
Address
751 E Ada Ave, Glendora, CA, 91741
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JM Siglock Construction
JM Siglock at 751 E Ada Ave, Glendora, CA 91741, held a General Contractor license (#868453) with the California contractors license board with an expiration date of 10-03-2011. We last verified the license was inactive on 04-11-2026.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.
JM Siglock Services
Start a project today:
Custom Home Build
New Home Construction
Medium Multi-Family New Con...
Other Residential New Const...
Multi-Room Remodel
Kitchen Remodel
Bathroom Remodel
Basement Remodel
Medium Multi-Family Remodel...
Other Residential Remodel
Office Renovation
Restaurant Renovation
Retail Renovation
Other Commercial Renovation
Roofing
Hardwood Flooring
Carpets
Laminate Flooring
Other Flooring
Painting
Framing
Wood Fences
Backsplash and Countertops
Stonework
Tile Flooring
Other Stone and Tile
Drywall
Interior Plaster
Brick and Blockwork
Other Masonry
Foundations
Other Concrete
Demolition
Paving, Driveways, and Side...
Excavation and Grading
JM Siglock Contact Information
Phone Number: (626) 428-2912
Address: 751 E Ada Ave, Glendora, CA 91741
This is a sample of this contractor's permits. Click here to access their complete permit history.
Addition/extention of family room bedroom and bathroom @ 226 s/f
Valuation:
N/A
Permit #:
BLD2005-00577
Status:
expired
Fee:
N/A
Permit Type:
General
Building Type:
N/A
Addition elect. fixtures for residential room addition
Valuation:
N/A
Permit #:
ELE2006-00013
Status:
expired
Fee:
N/A
Permit Type:
Electrical permit
Building Type:
N/A
Install vent systemf for residential room addition
Valuation:
N/A
Permit #:
MEC2006-00012
Status:
expired
Fee:
N/A
Permit Type:
Mechanical permit
Building Type:
N/A
Install plumbing for residential room addition
Valuation:
N/A
Permit #:
PLM2006-00014
Status:
expired
Fee:
N/A
Permit Type:
plumbing permit
Building Type:
N/A
JM Siglock Reviews
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Recent Buildzoom Projects
JM Siglock License info
Inactive License
| License # | 868453 |
| Status | Inactive |
| State | California |
| Type | General Building |
| 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 JM Siglock at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 802950 |
| Status | Inactive |
| State | California |
| Type | Painting And Decorating, General Building, Landscaping |
| 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 JM Siglock at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 941502 |
| Status | Inactive |
| State | California |
| Type | General Building |
| 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 JM Siglock at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
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- *No active license on file. If you are JM Siglock, log in and update your license info in the “Edit Profile” tab.
Bonded
| Bonded Agent | Business Alliance Insurance Company |
| Bond Value | $12,500 |
JM Siglock Employees
JS
Jeff Siglock
Owner
JS
Jeffrey Marshall Siglock
Sole Owner
MD
Michael Patrick Duffy
Rmo