Updated: May 30, 2026
Location and Projects
Address
Medford, MA, 02155
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William J McMahon Architect
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 William J McMahon, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William J McMahon Services
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William J McMahon Contact Information
Phone Number: (781) 391-8434
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Construct a 12 x 6 deck with 4 x 3 steps - must use 12 footings - deck must be constructed to meet 110mph wind zone requirements (app67722) (z20151198)
Valuation:
$2,000
Permit #:
A20151361
Status:
ISSUED
Fee:
$40
Permit Type:
Residential addit...
Building Type:
N/A
Renovate first floor 8 x 12 ceiling 15 x 1 beam 12'6 x 1 beam -2nd floor 12'6 x 8 2 x 8 - single family
Valuation:
$20,000
Permit #:
A20151019
Status:
N/A
Fee:
$150
Permit Type:
Residential addit...
Building Type:
N/A
Replace 4 x 4 front & rear stoops both with 4 x 3 stairs - construct 12 x 12 porch (pmca)
Valuation:
$5,000
Permit #:
A20151063
Status:
N/A
Fee:
$50
Permit Type:
Residential addit...
Building Type:
N/A
Remove and replace nine (9) windows and three (3) doors - replace siding - single family house
Valuation:
$5,000
Permit #:
A20150836
Status:
N/A
Fee:
$40
Permit Type:
Residential repla...
Building Type:
N/A
Demolition & removal of carriage house
Valuation:
$5,500
Permit #:
SF116081
Status:
filed
Fee:
$80
Permit Type:
N/A
Building Type:
Other
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William J McMahon License info
License Not Verified
| License # | 6709 |
| Status | Active |
| State | Massachusetts |
| Type | Architect |
- When BuildZoom last verified this license, it had an expiration date of August, 2025. Check the current license status of William J McMahon with the Commonwealth of Massachusetts E-Licensing Board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CS-096211 |
| 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 McMahon at the Massachusetts Department of Public Safety.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CS-096211 |
| Status | Inactive |
| State | Massachusetts |
| Type | 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 McMahon 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 McMahon Employees
WM
William P. Mcmahon
Owner