Updated: Jun 02, 2026
Location and Projects
Address
851 E Highway 224 Unit A5, Denver, CO, 80229
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One Core Electric Inc
One Core Electric Inc, 851 E Highway 224 Hwy, Denver, CO (Owned by: Leslie Scott Willimas) holds a Electrical license and 16 other licenses according to the Castle Rock license board.
Their BuildZoom score of 107 ranks in the top 6% of 55,949 Colorado licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring One Core Electric Inc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
One Core Electric Inc Contact Information
Phone Number: (303) 288-4343
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Address: 851 E Highway 224 Unit A5, Denver, CO 80229
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One Core Electric Inc Denver
Quality
107
94th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
One Core Electric Inc has a BuildZoom score of 107, which places them above 94% of 55,949 contractors in Colorado.
Activity
|
11 projects
|
2025 |
|
11 projects
|
2024 |
|
81 projects
|
2023 |
Our building permit records indicate that One Core Electric Inc has worked on at least
103.0 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
|
78 projects
|
New Constructions |
|
3 projects
|
Home Additions |
|
72 projects
|
Electrical projects |
Analyzing permits over the last 4 years shows that One Core Electric Inc mostly works on
new construction
and electrical project
projects.
Pricing
|
7 projects
|
< $5k |
|
9 projects
|
$5k-$20k |
|
5 projects
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
56 projects
|
$100k-$250k |
|
14 projects
|
$250k-$500k |
The typical size of their permits is approximately $208,277. 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.
Building Permits by One Core Electric Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Furnish and install new line voltage electrical circuitry and devices for existing two-story single family residence with unfinished basement. upgrade electrical service to 200-amp and install required grounding and bonding. no work will be performed on the detached structure at this property; it is excluded from this scope
Valuation:
$19,000
Permit #:
2025-ELEC-0010631
Status:
issued
Fee:
$171
Permit Type:
N/A
Building Type:
Single family res...
We are removing all existing inside wiring for this unit and rewiring to meet the current addition of the nec code. the panel was installed under another permit and the wiring is to be removed all the way back to its source
Valuation:
N/A
Permit #:
ELE2025-01145
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Finishing existing (currently unfinished) room/utility area in basement to create 1 non-conforming office/den room & laundry/utility area. also adding a closet and completing an egress window well to make existing non-conforming office in basement a conforming bedroom
Valuation:
$20,000
Permit #:
RES-3607-2024
Status:
final
Fee:
$1,107
Permit Type:
N/A
Building Type:
N/A
The air conditioning is being replaced we are running new carflex wire and replacing disconnect and re-hooking up power to new replacement air conditioning unit on roof. installed roof supports for flex and disconnect
Valuation:
$5,210
Permit #:
2024-ELEC-0011371
Status:
final
Fee:
$67
Permit Type:
N/A
Building Type:
Single family res...
The basement is finished already. we will be adding a partition wall and a closet to part of the basement to create a bedroom and adding egress windows to the existing bedroom and the new bedroom. the egress windows will be replacing the current windows so the new windows will be drop cuts only
Valuation:
$8,000
Permit #:
23NGN-01471
Status:
issued
Fee:
$628
Permit Type:
N/A
Building Type:
N/A
Removing 1960 zinsco 400amp disconnect single phase and replacing with new disconnect and fuses
Valuation:
$12,245
Permit #:
2025-LOG-0003175
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace 100 amp federal pacific panel and 100 amp federal pacific breaker disconnect next to meter. addition two circuits for microwave and bathroom gfci
Valuation:
$3,757
Permit #:
2024-ELEC-0001234
Status:
final
Fee:
$51
Permit Type:
N/A
Building Type:
Duplex
Replace 100 amp federal pacific panel and 100 amp federal pacific breaker disconnect next to meter. addition two circuits for microwave and bathroom gfci
Valuation:
$3,757
Permit #:
2024-ELEC-0001233
Status:
final
Fee:
$51
Permit Type:
N/A
Building Type:
Duplex
Main level interior renovation of an existing dwelling unit including the installation of new & replacement windows. no change of use or increased square footage
Valuation:
$50,000
Permit #:
RES-3433-2023
Status:
final
Fee:
$2,364
Permit Type:
N/A
Building Type:
N/A
Buildingonline | electrical changes to lighting ct with associated doucments
Valuation:
$7,154
Permit #:
1846751
Status:
issued
Fee:
$262
Permit Type:
Electrical permit
Building Type:
N/A
Plan 3 no master model a 2018 irc 1358 sq ft fin basement
Valuation:
$350,131
Permit #:
RES21-01619
Status:
final
Fee:
$12,298
Permit Type:
New sf attached
Building Type:
N/A
Plan 3 no master model b 2018 irc 887 sq ft fin basement
Valuation:
$299,869
Permit #:
RES21-01618
Status:
final
Fee:
$10,673
Permit Type:
New sf attached
Building Type:
N/A
Plan 5 model a 2018 irc 1380 sq ft fin basement
Valuation:
$350,131
Permit #:
RES21-01603
Status:
final
Fee:
$21,822
Permit Type:
New sf attached
Building Type:
N/A
House was damaged by water. onecore walked the wiring all looks wired to new code. onecore will be trimming and finishing electrical for homeowner
Valuation:
$5,120
Permit #:
2023-ELEC-0009919
Status:
issued
Fee:
$67
Permit Type:
N/A
Building Type:
Single family res...
Plan 1 model a 2018 irc no basement
Valuation:
$209,591
Permit #:
RES21-01591
Status:
final
Fee:
$6,790
Permit Type:
New sf attached
Building Type:
N/A
Plan 1 model a 2018 irc no basement
Valuation:
$209,591
Permit #:
RES21-01592
Status:
final
Fee:
$6,855
Permit Type:
New sf attached
Building Type:
N/A
Plan 1 model a 2018 irc no basement
Valuation:
$209,591
Permit #:
RES21-01590
Status:
final
Fee:
$15,362
Permit Type:
New sf attached
Building Type:
N/A
Plan 1 model b 2018 irc no bmst
Valuation:
$208,277
Permit #:
RES21-01589
Status:
final
Fee:
$6,756
Permit Type:
New sf attached
Building Type:
N/A
Adding 65 sq. ft. mudroom to existing garage space
Valuation:
$12,000
Permit #:
24-000703
Status:
issued
Fee:
$598
Permit Type:
N/A
Building Type:
N/A
Electrical service upgrade
Valuation:
$3,000
Permit #:
ELEC25-00380
Status:
final
Fee:
$137
Permit Type:
Residential
Building Type:
N/A
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One Core Electric Inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
One Core Electric Inc License info
Verified License
| License # | CR25-0875 |
| Status | Active |
| Town | Castle Rock |
| Type | Electrical |
| Date Issued | 11-20-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for One Core Electric Inc at the Castle Rock Town, Colorado.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LIC-01004031 |
| Status | Active |
| City | Boulder |
| Type | Electrical |
| Class | Electrical |
| Date Issued | 09-02-2025 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for One Core Electric Inc at the Boulder Licensing Board.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 100645 |
| Status | Active |
| State | Colorado |
| Type | Electrical Contractor |
- When BuildZoom last verified this license, it had an expiration date of September, 2020. Check the current license status of One Core Electric Inc with the Colorado Division of Professions and Occupations
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 100645 |
| Status | Active |
| State | Colorado |
| Type | Electrical Contractor |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for One Core Electric Inc at the Colorado Division of Professions and Occupations.
This is a sample of licensing data; click here to access a complete history.
Verified License
| Status | Active |
| City | Denver |
| Type | Electrical |
- BuildZoom verified this license was active as of May 2026.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 100645 |
| Status | Active |
| State | Colorado |
| Type | Electrical Contractor |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for One Core Electric Inc at the Colorado Division of Professions and Occupations.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | E180072 |
| Status | Active |
| County | Douglas County |
| Type | Electrical |
- BuildZoom verified this license was active as of July 2025.
Verify this license's status for One Core Electric Inc at the Douglas County Building Division.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 160831051 |
| Status | Active |
| City | Westminster |
| Type | Electrical Contractor |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for One Core Electric Inc at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | AEC2337 |
| Status | Active |
| City | Arvada |
| Type | Contractor |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for One Core Electric Inc at the The City of Arvada, Colorado.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | EC.0100645 |
| Status | Active |
| State | Colorado |
| Type | Electrical Contractor |
- When BuildZoom last verified this license, it had an expiration date of September, 2017. Check the current license status of One Core Electric Inc with the Colorado Division of Professions and Occupations
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 25482 |
| Status | Active |
| City | Thornton |
| Type | Electrical |
- When BuildZoom last verified this license, it had an expiration date of September, 2017. Check the current license status of One Core Electric Inc with the Thornton City Development Contractor License
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 24-000175 |
| Status | Inactive |
| City | Lafayette |
| Type | Electrical Contractor |
- According to the City of Lafayette, 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 One Core Electric Inc at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Unverified License
| License # | 16-1631 |
| Status | Unable To Verify |
| Town | Castle Rock |
| Type | Electrical |
- BuildZoom was not able to verify this license with the licensing board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | Denver |
| Type | Electrical |
- According to the City and County of Denver Community Planning and Development, 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.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 150930044 |
| Status | Inactive |
| City | Westminster |
| Type | Electrical Contractor |
- According to the City of Westminster, Colorado, 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 One Core Electric Inc at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | E00283 |
| Status | Inactive |
| City | Littleton |
| Type | Contractor |
- According to the The City of Littleton, CO, 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 One Core Electric Inc at the The City of Littleton, CO.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | LCC2015062761 |
| Status | Inactive |
| City | Thornton |
| Type | Class D Electrical |
- According to the Thornton City Development Contractor License, 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 One Core Electric Inc at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
107
BuildZoom Score
Insured
| Insurer | Blackboard Ins |
Insured
| Workers Comp Provider | First Comp |
260
Permits
- Building permit records show that One Core Electric Inc has worked on 260 permitted projects.
One Core Electric Inc Employees
CT
Corinne Taylor
Contact
LW
Leslie S Williams
Contact
LW
Leslie Scott Williams
Co Owner
LW
Leslie Scott Willimas
Owner
LW
Leslie Williams
OI
Onecore Electric Inc
SW
Scott Williams