Updated: Jun 09, 2026
Location and Projects
Address
2240 S FLOWER WAY, Lakewood, CO, 80227
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G3 Mechanical Systems LLC
G3 Mechanical Systems LLC, 2240 S Flower Way, Lakewood, CO (Owned by: Brennan Donald B) holds a Plumbing license and 5 other licenses according to the Aurora license board.
Their BuildZoom score of 83 does not rank in the top 50% of Colorado contractors.
Their license was verified as active when we last checked. If you are thinking of hiring G3 Mechanical Systems LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
G3 Mechanical Systems LLC Contact Information
Phone Number: (303) 895-8889
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Address: 2240 S FLOWER WAY, Lakewood, CO 80227
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G3 Mechanical Systems LLC Reviews
3 out of 5 stars, based on
2
reviews
-
AnonymousMay 26, 2015
-
AnonymousNovember 16, 2014
Nice efficient man who left my house clean. Okay price, work was fine. I don't know much about plumbing but the toilet is working now.
Building Permits by G3 Mechanical Systems LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Pressure test existing gasline no modifications
Valuation:
$100
Permit #:
1103276
Status:
issued
Fee:
$29
Permit Type:
Mechanical permit
Building Type:
N/A
Pressure test existing gasline no modifications
Valuation:
$100
Permit #:
1103274
Status:
issued
Fee:
$29
Permit Type:
Mechanical permit
Building Type:
N/A
Plumbing for addition and remodel
Valuation:
$0
Permit #:
15-121128 PP
Status:
Active
Fee:
N/A
Permit Type:
Residential
Building Type:
N/A
Install piping for solar panels to boiler system
Valuation:
$1,200
Permit #:
P12-0162
Status:
final
Fee:
$65
Permit Type:
Single family det
Building Type:
N/A
Permit mfg - custom. 2736 welton st - spangalang brewery - tf change of use retail to mfg
Valuation:
N/A
Permit #:
2014-PLUMB-0000472701
Status:
approved
Fee:
$75
Permit Type:
N/A
Building Type:
N/A
Zivix tenant finish 2736 welton street unit 103
Valuation:
N/A
Permit #:
2015-PLUMB-0000396943
Status:
approved
Fee:
$59
Permit Type:
N/A
Building Type:
N/A
1610 ivy st - accerated plumbing and mechanical
Valuation:
N/A
Permit #:
2015-PLUMB-0003642
Status:
final
Fee:
$35
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
2015-PLUMB-0000737465
Status:
final
Fee:
$35
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
2015-PLUMB-0000297163
Status:
approved
Fee:
$35
Permit Type:
N/A
Building Type:
N/A
P
Valuation:
N/A
Permit #:
2015-PLUMB-0000315
Status:
final
Fee:
$43
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
2015-PLUMB-0000737464
Status:
approved
Fee:
$35
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
G3 Mechanical Systems LLC License info
Verified License
| Status | Active |
| City | Aurora |
| Type | Plumbing |
- BuildZoom verified this license was active as of June 2026.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 2938 |
| Status | Inactive |
| State | Colorado |
| Type | Plumbing Contractor |
- According to the Colorado Division of Professions and Occupations, 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 G3 Mechanical Systems LLC at the Colorado Division of Professions and Occupations.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | Denver |
- 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
| Status | Inactive |
| City | Denver |
- 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
| Status | Inactive |
| City | Denver |
| Type | Plbg A |
- 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 # | AEC633 |
| Status | Inactive |
| City | Arvada |
| Type | Contractor |
- According to the The City of Arvada, 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 G3 Mechanical Systems LLC at the The City of Arvada, Colorado.
This is a sample of licensing data; click here to access a complete history.
83
BuildZoom Score
11
Permits
- Building permit records show that G3 Mechanical Systems LLC has worked on 11 permitted projects.
G3 Mechanical Systems LLC Employees
BB
Brennan Donald B
Owner
DB
Donald Brennan
GL
G3 Mechanical Systems Llc
JO
Jamie Osborne
Stay away. They took over a month to do a job that was only a few hours to accomplish. The supervisor had to come and fix the other guys, obvious, mistakes. For example; the system drain was installed upside down, seriously. Then tried charging me over twice the agreed on rate. They are a classic example of why people don't trust plumbers. Find another plumber.