Updated: Jul 10, 2026
Location and Projects
Address
3630 21st St, Boulder, CO, 80304
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Base Building Group Construction
Serving Boulder, Colorado and the surrounding area, Base Building Group LLC specializes in custom home construction and residential remodels. Founded in 2006, the company has 18 years of experience managing projects ranging from new builds to whole-house renovations and additions. Their portfolio highlights a range of services including kitchen remodels, bathroom upgrades, outdoor living spaces, and basement finishing. Base Building Group LLC works with homeowners looking to modernize existing properties or build new custom residences, focusing on delivering tailored solutions based on each client’s goals and architectural style. The team is experienced in handling complex site conditions and integrates energy-efficient building practices where applicable. Their project management process covers all phases, from pre-construction planning through final walkthrough, ensuring consistent communication and coordination with architects, designers, and subcontractors throughout each project.
Base Building Group LLC Services
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Base Building Group LLC Contact Information
Phone Number: (720) 565-5921
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Address: 3630 21st St, Boulder, CO 80304
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Base Building Group LLC Boulder
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Base Building Group LLC has a BuildZoom score of 101, which places them above 88% of 55,949 contractors in Colorado.
Activity
|
5 projects
|
2025 |
|
4 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Base Building Group LLC has worked on at least
11.0 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
|
3 projects
|
Home Additions |
|
3 projects
|
Multi-room remodels |
|
3 projects
|
Kitchen remodels |
Analyzing permits over the last 4 years shows that Base Building Group LLC mostly works on
kitchen remodel
and multi-room remodel
projects.
Pricing
|
4 projects
|
$20k-$50k |
|
1 project
|
$50k-$100k |
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 Base Building Group LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Partial tear-off & reroof of single family dwelling 16 squares of dimensional shingles on a pitch represented as 2/12. all roof materials shall be installed per manufacturer’s specs. mid-roof inspection required if pitch is less than 4/12. all roof covering materials shall be listed as class a as tested in accordance with ul standard 790 or astm standard e 108. at inspection provide t... see more
Valuation:
N/A
Permit #:
RFG2025-00001
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
490 (e) sf garage alteration that includes two offices a workshop and a powder room. the scope is a conversion from a garage to a studio. additional attached garage space exists on the parcel as part of a 2017 new building
Valuation:
N/A
Permit #:
UTL2024-00071
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Boat dock and roof cover (spr-24-0047)
Valuation:
$30,000
Permit #:
BP-25-0113
Status:
issued
Fee:
$1,673
Permit Type:
N/A
Building Type:
N/A
New single family dwelling no garage (spr-20-0064)
Valuation:
$200,000
Permit #:
BP-20-2864
Status:
complete
Fee:
$7,825
Permit Type:
N/A
Building Type:
N/A
801 sf upper level alteration that includes the relocation of a bathroom and demolishing interior walls to open up the space
Valuation:
$66,515
Permit #:
BLD-SFD2023-00374
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Accessory structure - enclosed structure with heating and/or cooling accessory to single family dupl
2024-04-18
490 (e) sf garage alteration that includes two offices a workshop and a powder room. the scope is a conversion from a garage to a studio. additional attached garage space exists on the parcel as part of a 2017 new building
Valuation:
$40,690
Permit #:
BLD-ACC2023-00124
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Alteration of existing basement for a single family detached dwelling
Valuation:
$27,403
Permit #:
BLD-SFD2023-00144
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Convert attached workshop & garage to conditioned space (sprw-20-0054)
Valuation:
$250,000
Permit #:
BP-20-3174
Status:
complete
Fee:
$7,504
Permit Type:
N/A
Building Type:
N/A
Single family detached dwelling - addition and remodel
2019-08-27
Remodel of single family residence and expansion of existing balcony. scope includes closet remodel in basement bathroom kitchen dining and sunroom remodel on the main level and master bathroom and wic and upper level railing remodel. addition scope is expansion of existing fully cantilevered deck. see adr2018-00083 for specific minor mod approval
Valuation:
N/A
Permit #:
BLD-SFD2018-00092
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage alteration scope to include adding utility sink new suspended heater new ceiling wall insulation and associated mechanical electrical and plumbing. reference pmt2017-03122 for work related to home alterations. **scope modifed 9/14/17 - garage shall remain unconditioned with no space heating. garage to be insulated for comfort new drywall to be installed at walls and ceiling and... see more
Valuation:
N/A
Permit #:
PMT2017-03123-UTL
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage alteration scope to include adding utility sink new suspended heater new ceiling wall insulation and associated mechanical electrical and plumbing. reference pmt2017-03122 for work related to home alterations. **scope modifed 9/14/17 - garage shall remain unconditioned with no space heating. garage to be insulated for comfort new drywall to be installed at walls and ceiling and... see more
Valuation:
N/A
Permit #:
PMT2017-03123-PLB
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage alteration scope to include adding utility sink new suspended heater new ceiling wall insulation and associated mechanical electrical and plumbing. reference pmt2017-03122 for work related to home alterations. **scope modifed 9/14/17 - garage shall remain unconditioned with no space heating. garage to be insulated for comfort new drywall to be installed at walls and ceiling and... see more
Valuation:
N/A
Permit #:
PMT2017-03123-MEC
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Alteration of existing sfd including remodeling the main level, finishing the basement and converting an existing crawlspace into a new storage space. exterior rehabilitation of contributing house to include rehabilitation of existing windows, new door openings at rear (east) and low-profile skylight at rear roof area as detailed on landmark alteration certificate drawings dated 06.14... see more
Valuation:
N/A
Permit #:
BLD-SFD2018-00196
Status:
issued
Fee:
$3,521
Permit Type:
N/A
Building Type:
N/A
Garage alteration scope to include adding utility sink, new suspended heater, new ceiling/ wall insulation, and associated mechanical electrical and plumbing. reference pmt2017-03122 for work related to home alterations. **scope modifed 9/14/17 - garage shall remain unconditioned with no space heating. garage to be insulated for comfort, new drywall to be installed at walls and ceil... see more
Valuation:
N/A
Permit #:
PMT2017-03123
Status:
complete
Fee:
$1,026
Permit Type:
N/A
Building Type:
N/A
Alterations on main level to include removing existing windows and replacing with a new sliding glass door and reconfigure deck on the front and replace decking and top cap of rail at rear deck. work at upper level to include reconfiguration of deck. scope of work to also include replacing stairway leading to basement and adding a shed roof over basement stair. reference pmt2017-031... see more
Valuation:
N/A
Permit #:
PMT2017-03122
Status:
complete
Fee:
$552
Permit Type:
N/A
Building Type:
N/A
Garage alteration scope to include adding utility sink new suspended heater new ceiling wall insulation and associated mechanical electrical and plumbing. reference pmt2017-03122 for work related to home alterations. **scope modifed 9/14/17 - garage shall remain unconditioned with no space heating. garage to be insulated for comfort new drywall to be installed at walls and ceiling and... see more
Valuation:
N/A
Permit #:
PMT2017-03123
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Alterations on main level to include removing existing windows and replacing with a new sliding glass door and reconfigure deck on the front and replace decking and top cap of rail at rear deck. work at upper level to include reconfiguration of deck. scope of work to also include replacing stairway leading to basement and adding a shed roof over basement stair. reference pmt2017-03123... see more
Valuation:
N/A
Permit #:
PMT2017-03122
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition kitchen to existing basement and change of use to attached affordable adu
Valuation:
$29,064
Permit #:
BLD-SFD2023-00429
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Residential remodel
Valuation:
$75,000
Permit #:
BP-21-1269
Status:
complete
Fee:
$2,331
Permit Type:
N/A
Building Type:
N/A
New 1726 sf detached accessory building. **addition to scope - retaining wall added to building scope**
Valuation:
N/A
Permit #:
BLD-ACC2022-00039
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Base Building Group LLC License info
Verified License
| License # | LIC-0008563-GENCC |
| Status | Active |
| City | Boulder |
| Type | General |
| Class | Class C |
| Date Issued | 09-25-2025 |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Base Building Group LLC at the Boulder Licensing Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | CON-12-0120 |
| Status | Active |
| County | Boulder County |
| Type | One And Two Family Residential |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Base Building Group 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 # | GCC1157519 |
| Status | Active |
| City | Lafayette |
| Type | General Class C |
- When BuildZoom last verified this license, it had an expiration date of May, 2021. Check the current license status of Base Building Group LLC with the City of Lafayette
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | LIC-0008563 |
| Status | Active |
| City | Boulder |
| Type | General Contractor |
| Class | Class C |
- When BuildZoom last verified this license, it had an expiration date of December, 2018. Check the current license status of Base Building Group LLC with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 0008563 |
| Status | Active |
| City | Boulder |
| Type | General Contractor Class C |
- When BuildZoom last verified this license, it had an expiration date of September, 2014. Check the current license status of Base Building Group LLC with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | Denver |
| Type | General Contractor Class 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.
101
BuildZoom Score
43
Permits
- Building permit records show that Base Building Group LLC has worked on 43 permitted projects.
Base Building Group LLC Employees
BG
Behmer Gregg
Owner
GB
Gregg Behmer
SB
Stewart Booker
Owner