Updated: Nov 21, 2025
Location and Projects
Address
41 West Adams Street East, Great River, NY, 11739
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First Hammer Construction Corp
Their BuildZoom score of 90 indicates that they are licensed or registered but we do not have additional information about them.
If you are thinking of hiring First Hammer Construction Corp, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
First Hammer Construction Corp Services
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First Hammer Construction Corp Contact Information
Phone Number: (631) 650-5462
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Address: 41 West Adams Street East, Great River, NY 11739
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Building Permits by First Hammer Construction Corp
This is a sample of this contractor's permits. Click here to access their complete permit history.
Construct one story side addition w/site improvements
Valuation:
$100,000
Permit #:
201417845
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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First Hammer Construction Corp License info
License Not Verified
| License # | 202927 |
| Status | Active |
| County | Nassau County |
| Type | Home Improvement Contractors |
- When BuildZoom last verified this license, it had an expiration date of April, 2026. Check the current license status of First Hammer Construction Corp with the Nassau County Office of Consumer Affairs
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 45677 |
| Status | Active |
| County | Suffolk County |
| Type | H H1 - Gc |
- When BuildZoom last verified this license, it had an expiration date of January, 2015. Check the current license status of First Hammer Construction Corp with the Suffolk County Department of Consumer Affairs
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | H04420500 |
| Status | Active |
| County | Nassau County |
- When BuildZoom last verified this license, it had an expiration date of January, 2015. Check the current license status of First Hammer Construction Corp with the Nassau County Office of Consumer Affairs
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | H0442050000 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office of Consumer Affairs, 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 First Hammer Construction Corp at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
90
BuildZoom Score
First Hammer Construction Corp Employees
WM
William Mahoney
Owner
WM
William P Mahoney
President