Updated: Oct 10, 2025
Location and Projects
Address
38 PLEASANT ST., Mendon, MA, 01756
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John S. Grengaii Electrician
John S. Grengaii, 38 Pleasant St, Mendon, MA (Owned by: John S Grenga) holds a Electrician license and 5 other licenses according to the Massachusetts license board.
Their BuildZoom score of 99 ranks in the top 15% of 139,240 Massachusetts licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring John S. Grengaii, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
John S. Grengaii Contact Information
Phone Number: (508) 473-5833
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Address: 38 PLEASANT ST., Mendon, MA 01756
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John S. Grengaii Mendon
Quality
99
85th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
John S. Grengaii has a BuildZoom score of 99, which places them above 85% of 139,240 contractors in Massachusetts.
Activity
|
3 projects
|
2025 |
|
6 projects
|
2024 |
|
13 projects
|
2023 |
Our building permit records indicate that John S. Grengaii has worked on at least
22.0 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.
Experience
|
21 projects
|
Electrical projects |
Analyzing permits over the last 4 years shows that John S. Grengaii mostly works on
electrical project
projects.
Pricing
|
2 projects
|
< $5k |
|
1 project
|
$5k-$20k |
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.
Install new 100amp sub panel in basement. install new circuits and receptacles for dishwasher microwave and range
Valuation:
N/A
Permit #:
E-2023-00234
Status:
issued
Fee:
$125
Permit Type:
N/A
Building Type:
N/A
Automatic home standby generator and automatic transfer switch
Valuation:
N/A
Permit #:
E-2023-00015
Status:
issued
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Automatic home standby generator and transfer switch
Valuation:
N/A
Permit #:
E-2023-00041
Status:
issued
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$1,300
Permit #:
E-25-13
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
Home standby generator and automatic transfer switch
Valuation:
N/A
Permit #:
E-2023-00303
Status:
issued
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Hot tub & gfi receptacle
Valuation:
N/A
Permit #:
E-2021-00071
Status:
issued
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-22-11
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-22-58
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-22-57
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-22-40
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$1,400
Permit #:
E-25-32
Status:
complete
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
$2,000
Permit #:
EP-21-221
Status:
issued
Fee:
$90
Permit Type:
Appliances/lights
Building Type:
N/A
Install generator
Valuation:
N/A
Permit #:
EP-2020-000106
Status:
issued
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-162
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-158
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-138
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-92
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-50
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-24-40
Status:
issued
Fee:
N/A
Permit Type:
Existing
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
E-20-43
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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John S. Grengaii Reviews
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Verified License
BuildZoom confirmed this contractor's license
John S. Grengaii License info
Verified License
| License # | 14607 |
| Status | Active |
| State | Massachusetts |
| Type | Electrician |
- BuildZoom verified this license was active as of June 2025.
Verify this license's status for John S. Grengaii at the Commonwealth of Massachusetts E-Licensing Board.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 14607 |
| Status | Active |
| City | Newton |
| Type | Electrical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of John S. Grengaii with the City of Newton Massachusetts
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 14607 |
| Status | Active |
| City | Newton |
| Type | Electrical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of John S. Grengaii with the City of Newton Massachusetts
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 000030899 |
| Status | Active |
| City | Newton |
| Type | Electrical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of John S. Grengaii with the City of Newton Massachusetts
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 000014607 |
| Status | Inactive |
| City | Newton |
| Type | Electrical Contractor |
- According to the City of Newton Massachusetts, 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 S. Grengaii at the City of Newton Massachusetts.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 000014607 |
| Status | Inactive |
| City | Newton |
| Type | Electrical Contractor |
- According to the City of Newton Massachusetts, 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 S. Grengaii at the City of Newton Massachusetts.
This is a sample of licensing data; click here to access a complete history.
99
BuildZoom Score
69
Permits
- Building permit records show that John S. Grengaii has worked on 69 permitted projects.
John S. Grengaii Employees
JG
John S Grenga
Owner
JI
John S Grenga Ii
Owner
JG
John S. Grengaii.
PE
Precision Electric,Inc.
Owner