Updated: May 25, 2026
Location and Projects
Address
18 WILLIAMS STREET, Newton, MA, 02464
Use our bidding system to
request a quote
John Paul Mastaj Construction
John Paul Mastaj, 18 Williams St, Newton, MA holds a Building Licenses, Construction Supervisor license and 1 other license according to the Massachusetts license board.
Their BuildZoom score of 92 ranks in the top 32% of 139,240 Massachusetts licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring John Paul Mastaj, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
John Paul Mastaj Services
Start a project today:
John Paul Mastaj Contact Information
Phone Number: (617) 803-6070
Edit
Address: 18 WILLIAMS STREET, Newton, MA 02464
Edit
Do you work for this business? Unlock this free profile to update company info and see who's viewing your profile.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Modernization and renovation of six (6) traction elevators located at the boston police headquarters 1 schroeder plaza. this work includes hvac and electrical updates relating to the elevators
Valuation:
$2,492,435
Permit #:
ALT1346673
Status:
filed
Fee:
$350
Permit Type:
N/A
Building Type:
Commercial
Wire 2 bathroom rooms
Valuation:
N/A
Permit #:
25676
Status:
complete
Fee:
N/A
Permit Type:
Additions and rem...
Building Type:
N/A
Similar Contractors See more
181
BZ Score
$468K
Avg Project
-
Projects
181
BZ Score
$41.4K
Avg Project
-
Projects
175
BZ Score
$70.1K
Avg Project
-
Projects
John Paul Mastaj Reviews
BuildZoom hasn't received any reviews for John Paul Mastaj. Click here to be alerted when reviews are posted about them.
Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
John Paul Mastaj License info
Verified License
| License # | CS-114717 |
| Status | Active |
| State | Massachusetts |
| Type | Building Licenses, Construction Supervisor |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for John Paul Mastaj at the Massachusetts Department of Public Safety.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 198951 |
| 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 John Paul Mastaj at the Mass.gov Consumer Affairs and Business Regulation.
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
John Paul Mastaj Employees
JM
John Paul Mastaj
Owner