Updated: Jun 02, 2026
Location and Projects
Address
Longmont, CO, 80503
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Gj Koeppen Construction LLC
Gj Koeppen Construction LLC has nearly two decades of experience serving clients in Colorado. The company specializes in general contracting projects across residential and commercial properties. Portfolio examples highlight work on kitchen and bathroom remodels, basement finishes, and additions. Owner Greg Koeppen is actively involved in project coordination and oversees each phase of construction from planning through completion. Gj Koeppen Construction LLC works with homeowners and property managers on both renovations and new construction, providing solutions tailored to client needs. The company utilizes established relationships with local suppliers and subcontractors to ensure timely project delivery and adheres to industry standards throughout all projects. Gj Koeppen Construction LLC is known for its clear communication and practical approach to each project it undertakes within the region.
Gj Koeppen Construction LLC Services
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Gj Koeppen Construction LLC Contact Information
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Gj Koeppen Construction LLC
Quality
104
91st percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Gj Koeppen Construction LLC has a BuildZoom score of 104, which places them above 91% of 55,949 contractors in Colorado.
Activity
|
14 projects
|
2025 |
|
11 projects
|
2024 |
|
4 projects
|
2023 |
Our building permit records indicate that Gj Koeppen Construction LLC has worked on at least
29.0 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
|
7 projects
|
Home Additions |
|
10 projects
|
Kitchen remodels |
|
7 projects
|
Multi-room remodels |
Analyzing permits over the last 4 years shows that Gj Koeppen Construction LLC mostly works on
kitchen remodel
and multi-room remodel
projects.
Pricing
|
2 projects
|
< $5k |
|
2 projects
|
$5k-$20k |
|
8 projects
|
$20k-$50k |
|
9 projects
|
$50k-$100k |
|
5 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $66,000. 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.
Building Permits by Gj Koeppen Construction LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Convert existing garage to living room including adding 2 new windows and eliminating 1 (e) window. replace existing windows on main floor with new vinyl windows. no change to existing opening size. replace existing asphalt shingle roof and install new gutters
Valuation:
$75,000
Permit #:
B202502291
Status:
issued
Fee:
$9,050
Permit Type:
N/A
Building Type:
N/A
Remodel existing finished basement. no change to current layout. addition wall firring and insulation to exterior walls refresh bathroom. redo existing hot water baseboard heaters. addition (2) egress windows enlarge (2) additional windows
Valuation:
$75,000
Permit #:
B202501330
Status:
complete
Fee:
$3,180
Permit Type:
N/A
Building Type:
N/A
Kitchen remodel - fixtures and appliances to remain in existing locations. upgrade electrical to current code modify lighting. vent range hood to exterior. extend gas line to new range. replace windows throughout the main floor
Valuation:
$30,000
Permit #:
B202502759
Status:
complete
Fee:
$1,469
Permit Type:
N/A
Building Type:
N/A
Convert existing garage to living room including adding 2 new windows and eliminating 1 (e) window. replace existing windows on main floor with new vinyl windows. no change o existing opening size. replace existing asphalt shingle roof and install new gutters
Valuation:
$75,000
Permit #:
B202406176
Status:
issued
Fee:
$3,180
Permit Type:
N/A
Building Type:
N/A
Basement finish - 1175 sf to include 1 bedroom 3/4 bathroom living room with wet bar and unfinished storage
Valuation:
$98,324
Permit #:
BLD-SFD2025-00086
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen remodel to include removal of non-load bearing wall new kitchen layout adding can lighting to 2 bedrooms replacing 5 windows with new windows
Valuation:
$47,997
Permit #:
24-000114
Status:
issued
Fee:
$2,146
Permit Type:
N/A
Building Type:
N/A
Remodel primary bathroom including new window relocate bathroom tub enlarge existing steam shower relocate (1) lav sink. extend side entry below existing porch roof approximately 40sf
Valuation:
$72,000
Permit #:
RES-3283-2023
Status:
certificate of completion
Fee:
$3,114
Permit Type:
N/A
Building Type:
N/A
600 square foot detached garage. no plumbing or heating
Valuation:
$120,000
Permit #:
B202500298
Status:
issued
Fee:
$4,736
Permit Type:
N/A
Building Type:
N/A
300 sf kitchen remodel including structural modification to remove load bearing wall and addition new window. also includes installation of a replace gas fireplace
Valuation:
$24,849
Permit #:
BLD-SFD2024-00005
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
480 sf detached garage with 480 sf unfinished second floor. plumbing and electrical to be roughed in for future finished space
Valuation:
$150,000
Permit #:
B202407868
Status:
issued
Fee:
$6,814
Permit Type:
N/A
Building Type:
N/A
The basement was originally finished and after the 2013 flood all the drywall was removed from the walls. we want to renovate the 1, 056 square foot basement this is less that 50% of the total square footage for the home the total home square footage is 2, 304. no work to the remainder of the home. we are utilizing the existing layout. there is no increase in plumbing fixtures. there ... see more
Valuation:
$87,690
Permit #:
BLD-SFD2023-00196
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel 200sf primary bathroom to include relocation of shower and bathtub plumbing. move one non structural wall to enlarge closet an replace one existing window
Valuation:
$66,000
Permit #:
B202405812
Status:
complete
Fee:
$2,859
Permit Type:
N/A
Building Type:
N/A
Addition a bedroom in an existing finished basement. we are we are not planning to remove any drywall so we believe asbestos testing is not needed
Valuation:
$6,000
Permit #:
B202504747
Status:
complete
Fee:
$960
Permit Type:
N/A
Building Type:
N/A
Permit to alter an existing detached garage including demolition of the east end of the garage currently attached to arear porch roof. associated with the addition and alteration of the single family dwelling under bld-sfd2022-00292
Valuation:
$2,904
Permit #:
BLD-ACC2022-00056
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel existing basement adding 1 bedroom with new egress window and window well office living room replace wood fireplace with new gas fireplace no structural modifications no changes to bathroom
Valuation:
$59,634
Permit #:
22-000395
Status:
issued
Fee:
$2,590
Permit Type:
N/A
Building Type:
N/A
Kitchen and bathroom remodel including structural modification to remove load bearing post
Valuation:
$120,000
Permit #:
B202404251
Status:
complete
Fee:
$4,736
Permit Type:
N/A
Building Type:
N/A
Basement finish
Valuation:
$68,000
Permit #:
BP-24-3714
Status:
complete
Fee:
$2,046
Permit Type:
N/A
Building Type:
N/A
Basement finish: 2 bedrooms 3/4 bathroom large recreation room wet bar and unfinished storage -1385 sf
Valuation:
$107,658
Permit #:
BP-22-04872
Status:
complete
Fee:
$3,568
Permit Type:
N/A
Building Type:
Residential singl...
*voided for inactivity - no inspections within 180 days* *a 1546 sf addition to an existing 2353 sf single-family home. scope also includes 945 sf of alterations to the existing space. new addition includes unconditioned garage w new kitchen/living/dining rooms above. alterations include new finished areas in existing basement w new egress windows new master bathroom and updated fixtu... see more
Valuation:
N/A
Permit #:
BLD-SFD2020-00383
Status:
canceled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior remodel and basement finish
Valuation:
$150,000
Permit #:
BP-24-1782
Status:
complete
Fee:
$4,319
Permit Type:
N/A
Building Type:
N/A
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Gj Koeppen Construction LLC Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Gj Koeppen Construction LLC License info
Verified License
| License # | 21-040044 |
| Status | Active |
| City | Lafayette |
| Type | General Class B |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Gj Koeppen Construction LLC at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LIC-0008479-GENCB |
| Status | Active |
| City | Boulder |
| Type | General |
| Class | Class B |
| Date Issued | 04-16-2026 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Gj Koeppen Construction LLC at the Boulder Licensing Board.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | GCB6640044 |
| Status | Active |
| City | Lafayette |
| Type | General Class B |
- When BuildZoom last verified this license, it had an expiration date of August, 2022. Check the current license status of Gj Koeppen Construction LLC with the City of Lafayette
This is a sample of licensing data; click here to access a complete history.
104
BuildZoom Score
59
Permits
- Building permit records show that Gj Koeppen Construction LLC has worked on 59 permitted projects.
Gj Koeppen Construction LLC Employees
GK
Graham Koeppen
Owner