Updated: Jul 13, 2026
Location and Projects
Address
50 Hosmer St, West Boylston, MA, 01583
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William J Conz Construction
William J Conz, 50 Hosmer St, West Boylston, MA (Owned by: Kevin Callahan) holds a Home Improvement Contractor license and 4 other licenses according to the Massachusetts license board.
Their BuildZoom score of 90 indicates that they are licensed or registered but we do not have additional information about them.
Their license was verified as active when we last checked. If you are thinking of hiring William J Conz, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
William J Conz Services
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William J Conz Contact Information
Phone Number: (508) 596-5111
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Address: 50 Hosmer St, West Boylston, MA 01583
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Finish attic space install replacement windows & finish kitchen
Valuation:
N/A
Permit #:
BP-2009-0298
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install rear exit stairs (2nd means of egress 2nd floor apartment)
Valuation:
N/A
Permit #:
BP-2012-0052
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
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William J Conz License info
Verified License
| License # | 209845 |
| Status | Active |
| State | Massachusetts |
| Type | Home Improvement Contractor |
| Date Issued | 09-23-2025 |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for William J Conz at the Mass.gov Consumer Affairs and Business Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 209845 |
| Status | Active |
| City | Newton |
| Type | Building Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of William J Conz with the City of Newton Massachusetts
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 209845 |
| Status | Active |
| City | Newton |
| Type | Residential Builder |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of William J Conz with the City of Newton Massachusetts
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 161341 |
| Status | Inactive |
| State | Massachusetts |
| Type | Home Improvement Contractor |
- According to the Mass.gov Consumer Affairs and Business Regulation, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for William J Conz at the Mass.gov Consumer Affairs and Business Regulation.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CS-013783 |
| Status | Inactive |
| State | Massachusetts |
| Type | Building Licenses, Construction Supervisor |
- According to the Massachusetts Department of Public Safety, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for William J Conz at the Massachusetts Department of Public Safety.
This is a sample of licensing data; click here to access a complete history.
90
BuildZoom Score
William J Conz Employees
KC
Kevin Callahan
Owner
WC
William Conz
Owner
WC
William J Conz
Owner