Updated: Jun 24, 2026
Location and Projects
Address
125 Mason Cir, Concord, CA, 94520
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Cornerstone Environmental Group Electrician
Cornerstone Environmental Group LLC, 125 Mason Cir, Concord, CA (Employees: Cornerstone Environmental Group Llc and Fowler, Randy Lewis) holds a Electrical Business Permit license and 4 other licenses according to the New Jersey license board.
Their BuildZoom score of 101 ranks in the top 12% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Cornerstone Environmental Group LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Cornerstone Environmental Group LLC Contact Information
Phone Number: (925) 299-9225
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Address: 125 Mason Cir, Concord, CA 94520
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Cornerstone Environmental Group LLC Concord
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Environmental Group LLC has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
4 projects
|
2025 |
|
1 project
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Cornerstone Environmental Group LLC has worked on at least
7.0 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
|
4 projects
|
Electrical projects |
Analyzing permits over the last 4 years shows that Cornerstone Environmental Group LLC mostly works on
electrical project
projects.
Pricing
|
1 project
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$100k-$250k |
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.
Building Permits by Cornerstone Environmental Group LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Soil excavation and installation of a vapor mitigation system for former dry cleaners 09/26/25 change of contractor to innovative construction solutions
Valuation:
$173,000
Permit #:
BD-2025-298744
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Supplemental to permit #24016-10000-14367 to change contractor from e v infrastructure llc to cornerstone environmental contractors inc
Valuation:
N/A
Permit #:
24016-70002-14367
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace a compressor within the existing structure and connect to the existing electrical panel. remove air claw compressor install and secure cabinet enclosed compressor and air dryer and an in-line particulate filter
Valuation:
$34,773
Permit #:
BP21-07574
Status:
final
Fee:
$1,752
Permit Type:
N/A
Building Type:
N/A
Scope of work to include: 1) installation of a soil vapor extraction and remediation system (former norge dry cleaners) 2) install a 8 foot tall cmu enclosure 3) electrical to power remediation system
Valuation:
$410,107
Permit #:
2019 151375 CI
Status:
final
Fee:
N/A
Permit Type:
Retail
Building Type:
N/A
1) installation of a soil vapor extraction and remediation system (former norge dry cleaners) 2) install a 8 foot tall cmu enclosure 3) electrical to power remediation system
Valuation:
$410,107
Permit #:
2019 139706 CI
Status:
filed
Fee:
N/A
Permit Type:
Retail
Building Type:
N/A
Soil vapor remediation system installation inside a pre-existing equipment compound located at the project address
Valuation:
$20,000
Permit #:
G-2022-00005
Status:
applied
Fee:
$572
Permit Type:
N/A
Building Type:
N/A
Pipe rerouting to existing high pressure gas. no change to total gas loads
Valuation:
N/A
Permit #:
25042-10000-04821
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Residential or agriculture electrical service 1000 amps or less
2025-05-01
Replacement electrical service - new pole - 200amp 3p 480v 75hp - ag use for cemetery irrigation c/s leedom rd
Valuation:
N/A
Permit #:
BLD2023-1400
Status:
final
Fee:
$161
Permit Type:
Ag well pump
Building Type:
N/A
Addition two power drops and relocate two power drops
Valuation:
N/A
Permit #:
F22-0040
Status:
issued
Fee:
$375
Permit Type:
Tenant improvement
Building Type:
N/A
Pepsi: 3 cord drops & addition cord drops transformer and power
Valuation:
$7,200
Permit #:
F21-0098
Status:
final
Fee:
$1,077
Permit Type:
Tenant improvement
Building Type:
N/A
Demolish gas station and food mart
Valuation:
$70,000
Permit #:
D20-000150
Status:
final
Fee:
$2,045
Permit Type:
N/A
Building Type:
N/A
Installation of 15 receptacles for (n) idf network panels
Valuation:
$20,000
Permit #:
COM23-0031
Status:
final
Fee:
$719
Permit Type:
Commercial
Building Type:
N/A
Relocate electrical for rplcmnt case sealer & air compressor
Valuation:
$10,540
Permit #:
COM23-0030
Status:
final
Fee:
$543
Permit Type:
Commercial
Building Type:
N/A
Move 3 cord drops & addition cord drops transformer and power
Valuation:
$7,200
Permit #:
COM21-0074
Status:
final
Fee:
$647
Permit Type:
Commercial
Building Type:
N/A
New 100 amp circuit for charging equipment
Valuation:
N/A
Permit #:
23041-90000-44900
Status:
final
Fee:
N/A
Permit Type:
Special equipment
Building Type:
N/A
One 100 amp one 1/4 h.p. motor (combustion air blower) one 2h.p. (liquid transfer pump) one 25 h.p. (sve blower)
Valuation:
N/A
Permit #:
2019000761
Status:
final
Fee:
$204
Permit Type:
N/A
Building Type:
N/A
Addition two power drops and relocate two power drops
Valuation:
$4,400
Permit #:
COM22-0031
Status:
final
Fee:
$389
Permit Type:
Commercial
Building Type:
N/A
Discharge to sewer
Valuation:
N/A
Permit #:
ENC2024-00263
Status:
issued
Fee:
$907
Permit Type:
Discharge
Building Type:
N/A
Gas system (new meter - re-connect to existing gas line)
Valuation:
N/A
Permit #:
2019001001
Status:
final
Fee:
$100
Permit Type:
N/A
Building Type:
N/A
Elevated pressure gas line
Valuation:
N/A
Permit #:
2020000339
Status:
final
Fee:
$84
Permit Type:
N/A
Building Type:
N/A
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Cornerstone Environmental Group LLC Reviews
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Verified License
BuildZoom confirmed this contractor's license
Cornerstone Environmental Group LLC License info
Verified License
| License # | 34EB01892900 |
| Status | Active |
| State | New Jersey |
| Type | Electrical Business Permit |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Cornerstone Environmental Group LLC at the New Jersey Department of Law & Public Safety.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 0088498 |
| Status | Active |
| State | Nevada |
| Type | C 2 Electrical |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Cornerstone Environmental Group LLC at the Nevada State Contractors Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 397071 |
| Status | Active |
| State | New Mexico |
| Type | Specialties, Residential And Commercial Electrical Wiring 5000 Volts, Nominal Or Less |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Cornerstone Environmental Group LLC at the New Mexico Contractor Licensing Division.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 184005096 |
| Status | Active |
| State | Illinois |
| Type | Design Firm Prof Reg |
- When BuildZoom last verified this license, it had an expiration date of April, 2017. Check the current license status of Cornerstone Environmental Group LLC with the Illinois Department of Financial & Professional Regulation
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 380149 |
| Status | Inactive |
| State | New Mexico |
- According to the New Mexico Contractor Licensing Division, 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 Cornerstone Environmental Group LLC at the New Mexico Contractor Licensing Division.
This is a sample of licensing data; click here to access a complete history.
101
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $30,000 |
55
Permits
- Building permit records show that Cornerstone Environmental Group LLC has worked on 55 permitted projects.
Cornerstone Environmental Group LLC Employees
CG
Cornerstone Environmental Grou
Owner
CL
Cornerstone Environmental Group Llc
Owner
FL
Fowler, Randy Lewis
President Treasurer Secretary
HG
Harvey, Michael Glenn
MH
Michael G Harvey
RF
Randy L Fowler