Updated: May 29, 2026
Location and Projects
Headquarters Address
Trabuco Canyon, CA, 92679
Local address
9 Pequot Court, Mashpee, MA, 02649
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William E Mahoney Construction
William E Mahoney, 9 Pequot Ct, Mashpee, MA (Owned by: William A. Mahoney Jr.) holds a Electrician license and 3 other licenses according to the Massachusetts license board.
Their BuildZoom score of 100 ranks in the top 13% of 139,240 Massachusetts licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring William E Mahoney, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William E Mahoney Services
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William E Mahoney Contact Information
Phone Number: (508) 292-9842
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Headquarters Address: Trabuco Canyon, CA, 92679
Local Address: 9 Pequot Court, Mashpee, MA 02649
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William E Mahoney Mashpee
Quality
100
87th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
William E Mahoney has a BuildZoom score of 100, which places them above 87% of 139,240 contractors in Massachusetts.
Activity
|
3 projects
|
2025 |
|
4 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that William E Mahoney has worked on at least
9.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Pricing
|
1 project
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
3 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
|
1 project
|
$500k-$1mil |
|
1 project
|
$1mil+ |
The typical size of their permits is approximately $123,000. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace windows and exterior door where noted on plan. replace roof line trim window trim corner boards and siding. make second floor bathroom slightly larger installed new bathtub tile and replace toilet in vanity. refinish wood floors on second floor and repaint walls ceiling and wood trim on the second floor
Valuation:
$113,580
Permit #:
R-25-2214
Status:
issued
Fee:
$909
Permit Type:
Repair alteration
Building Type:
N/A
Demolish existing structures on the property. construct new 5 bedroom 5 bathroom house according to the attached construction plans and site plan
Valuation:
$1,320,000
Permit #:
R-24-3158
Status:
issued
Fee:
$10,560
Permit Type:
Solarpanels
Building Type:
N/A
The homeowner would like to finish part of their basement. there would be a finished storage area mechanical room living area and addition additional bathroom in the basement. the plan also includes replacing the exterior entry door and windows
Valuation:
$75,000
Permit #:
R-24-1672
Status:
issued
Fee:
$600
Permit Type:
Alteration
Building Type:
N/A
We will construct new master suite addition (23’ 6” x 24’). the new addition will contain a full bathroom walk-in closet office and laundry room. there will be work done i. the front entrance to the house (8 x 12) and a dining room bump out that is 9 x 14
Valuation:
$185,000
Permit #:
R-22-2113
Status:
complete
Fee:
$1,480
Permit Type:
Addition
Building Type:
N/A
Remove exisiting partition that separates kitchen and dining room and install steel beam. install 5 windows and one door. addition existing half bathroom in 1st floor addition full bathroom on 2nd floor. remove existing kitchen cabinets and replace with new ones
Valuation:
$75,000
Permit #:
R-22-1749
Status:
issued
Fee:
$600
Permit Type:
Alteration
Building Type:
N/A
Removing wrap around porch and expanding living space within the same footprint of the existing house
Valuation:
$215,500
Permit #:
R-24-1166
Status:
issued
Fee:
$1,724
Permit Type:
Alteration addition
Building Type:
N/A
Installation of 5.5mwdc ground mounted solar array. installation including 12, 744 solar panels 2 central inverters 2 step-up transformers and 3 battery containers. racking done by others
Valuation:
$1,940,000
Permit #:
192837
Status:
complete
Fee:
N/A
Permit Type:
Electrical - solar
Building Type:
Business
Excavate foundation hall install concrete footing and foundation. backfill and install concrete slab to the parking platform
Valuation:
$24,892
Permit #:
R-24-2694
Status:
issued
Fee:
$199
Permit Type:
Parking platform
Building Type:
N/A
Construct new shed dormer and covered porch at front of house. all materials are to match existing
Valuation:
$123,000
Permit #:
R-23-2383
Status:
complete
Fee:
$984
Permit Type:
Alteration addition
Building Type:
N/A
Install new panel 4 outlets and a 60a disconnect for a computer room air conditioning unit
Valuation:
$50,000
Permit #:
E1170749
Status:
filed
Fee:
$24
Permit Type:
N/A
Building Type:
Other
Construct second floor dormer 14'9 x 11'11"; extend existing chimney and flue up 24 above existing ridge. addition two (2) bathrooms to second floor. stamped plan required onsite for all inspections. (app93831) (z20171619) - single family house
Valuation:
$47,000
Permit #:
A20180021
Status:
issued
Fee:
$108
Permit Type:
Residential addit...
Building Type:
N/A
Express alter online: siding: squ:6 matrl:white cedar shingles exp:5 mod:clear bwindows:1 no header change:y
Valuation:
N/A
Permit #:
2020-500648
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
101 single family
Express alter online: roof strip: no.squ:22 %:100 manu:certainteed mod:landmark rate/yrs:30
Valuation:
N/A
Permit #:
2020-500639
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
101 single family
Replace 10 windows
Valuation:
$14,000
Permit #:
REP-25-2499
Status:
complete
Fee:
$112
Permit Type:
N/A
Building Type:
N/A
4.3 mw air conditioning ground mount photovoltaic solar generating facility
Valuation:
N/A
Permit #:
EP-2019-0776
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repair of mv cable and conduit work from goab to national grid pole work has been completed and test report of cable is attached
Valuation:
$10,000
Permit #:
E-18-182
Status:
issued
Fee:
$100
Permit Type:
Service or Temp S...
Building Type:
Commercial
Tenant fit out for quarry industry marble granite inc. to install a machine to cut granite and marble only electrical and plumbing (separate permits)expired. no inspections
Valuation:
N/A
Permit #:
151543
Status:
suspended
Fee:
N/A
Permit Type:
Building - additi...
Building Type:
Business
2.026 mw battery storage locate din the array
Valuation:
N/A
Permit #:
EP-2020-0225
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Building a new 4 bedroom 2.5 bathroom and an unfinished half bathroom in the basement. the house will will have a front porch and rear upper roof terrace deck. the home will also be built as per plans submitted
Valuation:
$647,000
Permit #:
R-23-1355
Status:
complete
Fee:
$5,201
Permit Type:
N/A
Building Type:
N/A
Photovoltaic array
Valuation:
$828,000
Permit #:
E-17-0135
Status:
issued
Fee:
$1,606
Permit Type:
N/A
Building Type:
N/A
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
William E Mahoney License info
Verified License
| License # | 21278 |
| Status | Active |
| State | Massachusetts |
| Type | Electrician |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for William E Mahoney at the Commonwealth of Massachusetts E-Licensing Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | CS-103814 |
| 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 William E Mahoney at the Massachusetts Department of Public Safety.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 185528 |
| 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 E Mahoney 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-080198 |
| 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 E Mahoney at the Massachusetts Department of Public Safety.
This is a sample of licensing data; click here to access a complete history.
100
BuildZoom Score
37
Permits
- Building permit records show that William E Mahoney has worked on 37 permitted projects.
William E Mahoney Employees
WJ
William A. Mahoney Jr.
Owner
WI
William M Mahoney Ii
Owner
WI
William Mahoney Ii
Owner