Updated: Feb 08, 2026
Location
Address
35634 AVENUE 13, Madera, CA, 93636
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Jefferson Mechanical Services Inc
Jefferson Mechanical Services Inc, 35634 Avenue, Madera, CA (Employees: Becky Lynne Koop and Jefferson Dean Koop) holds a Warm Air Heating, Ventilating And Air Conditioning, Refrigeration license according to the California license board.
Their BuildZoom score of 93 ranks in the top 27% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Jefferson Mechanical Services Inc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Jefferson Mechanical Services Inc Services
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Jefferson Mechanical Services Inc Contact Information
Phone Number: (559) 479-1488
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Address: 35634 AVENUE 13, Madera, CA 93636
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Verified License
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Jefferson Mechanical Services Inc License info
Verified License
| License # | 847489 |
| Status | Active |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning, Refrigeration |
| Business Type | Corporation |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Jefferson Mechanical Services Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Technology Insurance Company Inc |
Jefferson Mechanical Services Inc Employees
BK
Becky Lynne Koop
Officer
JK
Jefferson Dean Koop
Rmo / Ceo / Pres