Updated: Jun 30, 2026
Location and Projects
Address
6175 Trevarton Dr, Longmont, CO, 80503
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Kj Thomas Construction HVAC/Mechanical Contractor
Kj Thomas Construction LLC, 6175 Trevarton Dr, Longmont, CO (Owned by: Karl Thomas) holds a Mechanical Contractor license and 10 other licenses according to the Lafayette license board.
Their BuildZoom score of 108 ranks in the top 5% of 55,949 Colorado licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Kj Thomas Construction LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Kj Thomas Construction LLC Contact Information
Phone Number: (303) 435-8141
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Address: 6175 Trevarton Dr, Longmont, CO 80503
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Kj Thomas Construction LLC Longmont
Quality
108
95th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Kj Thomas Construction LLC has a BuildZoom score of 108, which places them above 95% of 55,949 contractors in Colorado.
Activity
|
70 projects
|
2025 |
|
36 projects
|
2024 |
|
37 projects
|
2023 |
Our building permit records indicate that Kj Thomas Construction LLC has worked on at least
143.0 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
|
11 projects
|
Home Additions |
|
123 projects
|
HVAC projects |
|
10 projects
|
Mechanical projects |
Analyzing permits over the last 4 years shows that Kj Thomas Construction LLC mostly works on
hvac project
and home addition
projects.
Pricing
|
18 projects
|
< $5k |
|
40 projects
|
$5k-$20k |
|
13 projects
|
$20k-$50k |
|
3 projects
|
$50k-$100k |
|
6 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
|
1 project
|
$500k-$1mil |
The typical size of their permits is approximately $12,577. 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 Kj Thomas Construction LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replacement of existing furnace and air conditioning with a furnace and heat pump **all new plastic glued vents for fuel burning appliances must undergo pressure testing. to facilitate the inspection process please provide photographic evidence of the pressure test directly to the assigned inspector on the day the rough mechanical inspection is scheduled. approved tests: 10 ft water t... see more
Valuation:
N/A
Permit #:
MEC2025-01499
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replacing gas furnace with new gas furnace **please provide a project valuation. project valuation should represent the total time and materials related to the project scope. 50% of the total project valuation should be the full cost of materials and the other 50% of the project valuation is the full cost for labor. please provide your valuation for the project by uploading a file int... see more
Valuation:
$0
Permit #:
MEC2025-01410
Status:
complete
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Replacement of two existing a/cs and two existing furnaces **all new plastic glued vents for fuel burning appliances must undergo pressure testing. to facilitate the inspection process please provide photographic evidence of the pressure test directly to the assigned inspector on the day the rough mechanical inspection is scheduled. approved tests: 10 ft water test 5 psi positive pres... see more
Valuation:
$0
Permit #:
MEC2025-01409
Status:
complete
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Installation of a new furnace and air conditioning **all new plastic glued vents for fuel burning appliances must undergo pressure testing. to facilitate the inspection process please provide photographic evidence of the pressure test directly to the assigned inspector on the day the rough mechanical inspection is scheduled. approved tests: 10 ft water test 5 psi positive pressure or ... see more
Valuation:
$0
Permit #:
MEC2025-01406
Status:
issued
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
New 2nd floor poptop additon (366 sq ft). addition to included new primary suite with 3/4 bathroom and new master closet. demolish existing laundry closet and addition new bedroom closet
Valuation:
$219,000
Permit #:
RES-2046-2022
Status:
final
Fee:
$7,903
Permit Type:
N/A
Building Type:
N/A
Finish existing 792sf carriage house interior only above garage. garage full is existing w insulation. ch space is currently unfinished. impact fees paid on permit number b200203599
Valuation:
$120,000
Permit #:
B202400630
Status:
expired
Fee:
$4,736
Permit Type:
N/A
Building Type:
N/A
Single story addition to existing residence
Valuation:
$250,000
Permit #:
RES-3978-2025
Status:
plancheck
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New single family home rebuild from the marshall fire
Valuation:
$568,945
Permit #:
RES-2512-2022
Status:
final
Fee:
$20,430
Permit Type:
N/A
Building Type:
N/A
Interior remodel to existing kitchen (400 sq ft). minor structural framing changes. no added sq ft or changes to building envelope
Valuation:
$249,000
Permit #:
RES-1132-2021
Status:
certificate of completion
Fee:
$8,896
Permit Type:
N/A
Building Type:
N/A
Two-story addition 1563 sf and remodel of existing house and addition of detached accessory garage 414 sf. after the permit was issued a service upgrade from 100a to 200a was added
Valuation:
$475,000
Permit #:
B202100456
Status:
expired
Fee:
$17,591
Permit Type:
N/A
Building Type:
N/A
Addition bathroom bedroom + media room to unfinished basement
Valuation:
N/A
Permit #:
INT_R2024-00013
Status:
final
Fee:
N/A
Permit Type:
Basement finish
Building Type:
N/A
Remodel hall bath: -change tub/shower to shower only. -new vanity shower toilet and lighting. -remodel primary bath/closet. -demo closet and enlarge bathroom. -new 5-piece primary bathroom. -new non-structural walls in bedroom for new closets. -add laundry closet -add (3) windows
Valuation:
$72,000
Permit #:
RES-0918-2021
Status:
certificate of completion
Fee:
$3,114
Permit Type:
N/A
Building Type:
N/A
Relocate interior stair; demolish upper powder bath; excavate basement slab to move from 7ft to 8ft height unfinished basement
Valuation:
$175,500
Permit #:
B202310831
Status:
issued
Fee:
$6,585
Permit Type:
N/A
Building Type:
N/A
Addition of 440sf and new floor plan new kitchen and baths. new height of exterior walls and roof trusses
Valuation:
$475,000
Permit #:
B202101302
Status:
expired
Fee:
$16,371
Permit Type:
N/A
Building Type:
N/A
New residential addition and interior remodel
Valuation:
$420,000
Permit #:
B202309359
Status:
complete
Fee:
$14,707
Permit Type:
N/A
Building Type:
N/A
Electrical connections to new hvac unit mechanical permit mec2024-01929
Valuation:
N/A
Permit #:
MEC2025-00015
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen remodel
Valuation:
$95,000
Permit #:
RES-3868-2025
Status:
final
Fee:
$4,105
Permit Type:
N/A
Building Type:
N/A
Electrical from existing garage panel to new split unit - 40 amps
Valuation:
N/A
Permit #:
MEC2025-00449
Status:
applied
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Habitat for humanity finish a portion of the basement to house long term and out of town volunteers
Valuation:
$250,000
Permit #:
B202101515
Status:
complete
Fee:
$9,123
Permit Type:
N/A
Building Type:
N/A
Air conditioning furnace/boiler water heater heat pump
2025-11-03
Replacement of existing furnace & heat pump
Valuation:
$25,700
Permit #:
MEP-6043-2025
Status:
expired
Fee:
$1,049
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Kj Thomas Construction LLC License info
Verified License
| License # | 26-000176 |
| Status | Active |
| City | Lafayette |
| Type | Mechanical Contractor |
| Date Issued | 04-08-2026 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Kj Thomas Construction LLC at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 22-012197 |
| Status | Active |
| City | Lafayette |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of May, 2026. Check the current license status of Kj Thomas Construction LLC with the City of Lafayette
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LIC-0003567-MECHA |
| Status | Active |
| City | Boulder |
| Type | Mechanical |
| Class | Class A All Mechanical Work |
| Date Issued | 05-04-2026 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Kj Thomas Construction LLC at the Boulder Licensing Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | CL1620 |
| Status | Active |
| County | Larimer County, Co |
| Type | Mechanical Commercial |
| Class | Commercial |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Kj Thomas Construction LLC at the Larimer County.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | CON-14-0135 |
| Status | Active |
| County | Boulder County |
| Type | Commercial Mechanical Installations And Repair |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Kj Thomas 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 # | MEC7512197 |
| Status | Active |
| City | Lafayette |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of April, 2020. Check the current license status of Kj Thomas Construction LLC with the City of Lafayette
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | MEC7512197 |
| Status | Active |
| City | Lafayette |
| Type | Mechanical Contractor |
- When BuildZoom last verified this license, it had an expiration date of December, 2022. Check the current license status of Kj Thomas Construction 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-0003567 |
| Status | Active |
| City | Boulder |
| Type | Mechanical |
| Class | Class A All UMC Work |
- When BuildZoom last verified this license, it had an expiration date of December, 2018. Check the current license status of Kj Thomas Construction LLC with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 0003567 |
| Status | Active |
| City | Boulder |
| Type | Mechanical Class A All Umc Work |
- When BuildZoom last verified this license, it had an expiration date of May, 2015. Check the current license status of Kj Thomas Construction LLC with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1700440 |
| 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 Kj Thomas Construction LLC at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 110930040 |
| 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 Kj Thomas Construction LLC at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
108
BuildZoom Score
340
Permits
- Building permit records show that Kj Thomas Construction LLC has worked on 340 permitted projects.
Kj Thomas Construction LLC Employees
ET
Elise Thomas
Owner
KT
Karl Thomas
Owner
KT
Kj Thomas