Updated: Jul 14, 2026
Location and Projects
Address
3401 Arapahoe Ave, Unit 303, Boulder, CO, 80303
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Cosman Construction LLC
Cosman Construction LLC serves clients in Boulder, Colorado, with a focus on residential remodels and renovations. The company’s project portfolio highlights work in Boulder’s established neighborhoods, completing kitchen upgrades, bathroom remodels, and basement renovations. Cosman Construction LLC manages projects ranging from interior updates to more complex home improvement needs, working with homeowners seeking to modernize or expand their living spaces. The company emphasizes clear communication throughout the construction process and works closely with clients to implement design choices tailored to each property. With three years of experience in the Boulder area, Cosman Construction LLC has completed projects that reflect the preferences and architectural styles common to the region. The team coordinates all phases of the remodeling process, including demolition, carpentry, fixture installation, flooring, and finish work.
Cosman Construction LLC Services
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Cosman Construction LLC Contact Information
Phone Number: (303) 589-3402
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Address: 3401 Arapahoe Ave, Unit 303, Boulder, CO 80303
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Cosman Construction LLC Boulder
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cosman Construction LLC has a BuildZoom score of 103, which places them above 90% of 55,949 contractors in Colorado.
Activity
|
7 projects
|
2025 |
|
6 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Cosman Construction LLC has worked on at least
15.0 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
|
Home Additions |
Analyzing permits over the last 4 years shows that Cosman Construction LLC mostly works on
home addition
projects.
Pricing
|
4 projects
|
< $5k |
|
6 projects
|
$5k-$20k |
|
3 projects
|
$20k-$50k |
|
3 projects
|
$50k-$100k |
The typical size of their permits is approximately $16,104. 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 Cosman Construction LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
- remove existing 275 sq. ft. deck. - install a new deck that will be approximately 389 sq. ft. - new deck be less than 16 inches high and will include a step at one end. - the deck will attach to the house with ledger boards mounted to the poured concrete foundation and framing
Valuation:
$12,930
Permit #:
BLD-SFD2023-00088
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Single family detached dwelling - addition and remodel
2025-10-22
Removal of existing covered patio and addition of unconditioned thermally isolated sunroom
Valuation:
$59,416
Permit #:
BLD-SFD2025-00454
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Full rebuild of existing deck to same footprint with railing and decking changes. beam will be reused
Valuation:
$3,658
Permit #:
BLD-SFD2024-00035
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel of two existing bathrooms in residential unit; no new fixtures
Valuation:
$16,104
Permit #:
BLD-MFD2025-00048
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Accessory structure - unenclosed structure accessory to a single family dwelling duplex triplex or t
2024-03-25
Reconstruction of north and west deck to same footprint
Valuation:
$60,300
Permit #:
BLD-ACC2024-00017
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Accessory structure - unenclosed structure accessory to a single family dwelling duplex triplex or t
2024-03-25
Replacement of existing back deck and stairs to same footprint
Valuation:
$32,065
Permit #:
BLD-ACC2024-00018
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Full rebuild of 140 square foot back deck and stairs
Valuation:
$2,246
Permit #:
BLD-SFD2024-00303
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Single family detached dwelling - addition and remodel
2024-05-10
Replacement of existing back deck and stairs to same footprint
Valuation:
$3,737
Permit #:
BLD-SFD2024-00124
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Single family detached dwelling - addition and remodel
2024-09-16
Reconstruction of north and west deck to same footprint
Valuation:
$9,319
Permit #:
BLD-SFD2024-00123
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replacement of existing back to identical footprint
Valuation:
$50,000
Permit #:
BLDG24-00919
Status:
final
Fee:
$2,467
Permit Type:
Deck pergola or ramp
Building Type:
N/A
Construction of new back deck
Valuation:
$24,000
Permit #:
MISC-10076-2024
Status:
canceled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Accessory structure - unenclosed structure accessory to a single family dwelling duplex triplex or t
2023-10-12
Reconstruction of deck (143 sf)
Valuation:
$22,554
Permit #:
BLD-ACC2023-00104
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Reconstruction of deck (143 sf)
Valuation:
$2,377
Permit #:
BLD-SFA2023-00051
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Reconstruction of back deck and stairwell/roof
Valuation:
$5,738
Permit #:
BLD-SFD2025-00541
Status:
filed
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Single family detached dwelling - addition and remodel
2025-11-25
Replacement of existing back deck with similar footprint. distances to setbacks remain the same
Valuation:
$8,916
Permit #:
BLD-SFD2025-00540
Status:
filed
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
**void - no separate interior non-structural demolition on residential** - interior removal of non-structural drywall cabinetry and finishes at bathroom and kitchen due to damage from plumbing leak
Valuation:
N/A
Permit #:
DEM2025-00078
Status:
canceled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repair of kitchen bathroom and associated finishes due to plumbing damage
Valuation:
$16,853
Permit #:
BLD-MFD2025-00040
Status:
complete
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Deck
Valuation:
$57,000
Permit #:
BP-25-1427
Status:
issued
Fee:
$1,995
Permit Type:
N/A
Building Type:
N/A
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Cosman Construction LLC Reviews
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Cosman Construction LLC License info
Verified License
| License # | 26-000240 |
| Status | Active |
| City | Lafayette |
| Type | General Class A |
| Date Issued | 05-06-2026 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Cosman Construction LLC at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | CON-25-0165 |
| Status | Active |
| County | Boulder County |
| Type | Commercial Or Residential Construction |
| Date Issued | 07-30-2025 |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Cosman Construction LLC at the Boulder County Land Use Department.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | CON-23-0002 |
| Status | Active |
| County | Boulder County |
| Type | One And Two Family Residential |
- When BuildZoom last verified this license, it had an expiration date of January, 2026. Check the current license status of Cosman Construction LLC with the Boulder County Land Use Department
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 23-000219 |
| Status | Inactive |
| City | Lafayette |
| Type | General Class C |
- 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 Cosman Construction LLC at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 2001052 |
| Status | Inactive |
| City | Westminster |
| Type | General 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 Cosman Construction LLC at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
14
Permits
- Building permit records show that Cosman Construction LLC has worked on 14 permitted projects.
Cosman Construction LLC Employees
AC
Alex Cosman
Owner