Updated: Jun 16, 2026
Location and Projects
Address
5075 Kalamath St, Denver, CO, 80221
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Diller Mechanical Services
Diller Mechanical Services, 5075 Kalamath St, Denver, CO (Owned by: Nathan Diller) holds a Mechanical Contractor license and 27 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 Diller Mechanical Services, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Diller Mechanical Services Services
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Diller Mechanical Services Contact Information
Phone Number: (720) 341-4909
Address: 5075 Kalamath St, Denver, CO 80221
Diller Mechanical Services Denver
Quality
108
95th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Diller Mechanical Services has a BuildZoom score of 108, which places them above 95% of 55,949 contractors in Colorado.
Activity
|
2 projects
|
2025 |
|
20 projects
|
2024 |
|
51 projects
|
2023 |
Our building permit records indicate that Diller Mechanical Services has worked on at least
73.0 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
|
HVAC projects |
Analyzing permits over the last 4 years shows that Diller Mechanical Services mostly works on
hvac project
projects.
Pricing
|
2 projects
|
< $5k |
|
42 projects
|
$5k-$20k |
|
18 projects
|
$20k-$50k |
The typical size of their permits is approximately $14,000. 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 Diller Mechanical Services
This is a sample of this contractor's permits. Click here to access their complete permit history.
Install 2 ductless split systems in suite 200
Valuation:
N/A
Permit #:
MEC2025-00397
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace and install one 625 lb 3 ton 16 seer gas fired remote terminal unit. replace second 675 lb 4 ton 16 seer gas fired remote terminal unit. unit one is 49 lbs heavier unit two is 79 lbs heavier than previous rtu's. new exposed duct work will be installed on the roof
Valuation:
N/A
Permit #:
BP-20-02389
Status:
complete
Fee:
$1,512
Permit Type:
N/A
Building Type:
N/A
Tear off & reroof w malarkey asphalt shingles
Valuation:
$19,250
Permit #:
BP-23-0873
Status:
complete
Fee:
$488
Permit Type:
N/A
Building Type:
N/A
Primary residence - metal
Valuation:
$30,000
Permit #:
23-05704
Status:
complete
Fee:
$442
Permit Type:
Primary residence...
Building Type:
N/A
Primary residence - composition
Valuation:
$17,127
Permit #:
23-03315
Status:
complete
Fee:
$293
Permit Type:
Primary residence...
Building Type:
N/A
Primary residence - composition
Valuation:
$6,000
Permit #:
23-05705
Status:
complete
Fee:
$125
Permit Type:
Primary residence...
Building Type:
N/A
Primary residence - composition
Valuation:
$9,350
Permit #:
23-04303
Status:
complete
Fee:
$181
Permit Type:
Primary residence...
Building Type:
N/A
Hydronic heat-98% efficient 1, 000, 000 btu natural gas interior replacement boiler
Valuation:
N/A
Permit #:
MEC2021-01734
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace and install remote terminal unit with same cooling/heating capacity as existing remote terminal unit. new remote terminal unit will weigh 15 pounds less and hold down points will remain in same location
Valuation:
N/A
Permit #:
BP-19-01411
Status:
complete
Fee:
$935
Permit Type:
N/A
Building Type:
N/A
New roof for addition to house 1 layer asphalt shingles to match current on house
Valuation:
$2,500
Permit #:
2020-ROOFSIDE-0010161
Status:
final
Fee:
$43
Permit Type:
N/A
Building Type:
Single family res...
Primary residence - composition
Valuation:
$41,750
Permit #:
24-03321
Status:
complete
Fee:
$563
Permit Type:
Primary residence...
Building Type:
N/A
Garage. tear off existing roofing install ice and water install gaf timberline hd shingles per manufacture specification for high wind zone on a 10/12 roof pitch. permit exp 05/03/2019 not heated
Valuation:
N/A
Permit #:
18BNR-00130
Status:
complete
Fee:
$100
Permit Type:
N/A
Building Type:
N/A
Primary residence - composition
Valuation:
$19,630
Permit #:
22-03297
Status:
issued
Fee:
$321
Permit Type:
Primary residence...
Building Type:
N/A
Re-roof both sides of duplex - remove and replace roof
Valuation:
$20,000
Permit #:
B202307655
Status:
complete
Fee:
$841
Permit Type:
N/A
Building Type:
N/A
Primary residence
Valuation:
N/A
Permit #:
23-05669
Status:
applied
Fee:
N/A
Permit Type:
Primary residence
Building Type:
N/A
Primary residence
Valuation:
N/A
Permit #:
23-02971
Status:
applied
Fee:
N/A
Permit Type:
Primary residence
Building Type:
N/A
Dwelling. tear off existing roofing install ice and water install gaf timberline hd shingles per manufacture specification for high wind zone on a 10/12 roof pitch. permit exp 05/03/2019
Valuation:
N/A
Permit #:
18BNR-00129
Status:
complete
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
Primary residence - composition
Valuation:
$25,500
Permit #:
24-07174
Status:
issued
Fee:
$401
Permit Type:
Primary residence...
Building Type:
N/A
Primary residence - composition
Valuation:
$7,730
Permit #:
22-12554
Status:
complete
Fee:
$153
Permit Type:
Primary residence...
Building Type:
N/A
Primary residence - composition
Valuation:
$8,720
Permit #:
22-07219
Status:
complete
Fee:
$167
Permit Type:
Primary residence...
Building Type:
N/A
Diller Mechanical Services Reviews
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Verified License
BuildZoom confirmed this contractor's license
Diller Mechanical Services License info
Verified License
| License # | 18-091682 |
| Status | Active |
| City | Lafayette |
| Type | Mechanical Contractor |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Diller Mechanical Services at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | AEC4089 |
| Status | Active |
| City | Arvada |
| Type | Contractor |
| Date Issued | 04-09-2026 |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Diller Mechanical Services at the The City of Arvada, Colorado.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | AEC318 |
| Status | Active |
| Town | Parker |
| Type | Contractor |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Diller Mechanical Services at the The Town of Parker, Colorado.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LIC-0009054-MECHA |
| Status | Active |
| City | Boulder |
| Type | Mechanical |
| Class | Class A All Mechanical Work |
| Date Issued | 07-17-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Diller Mechanical Services at the Boulder Licensing Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LCC201801299 |
| Status | Active |
| City | Thornton |
| Type | Class D Mechanical Expires 2026 05 19 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Diller Mechanical Services at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
Verified License
| Status | Active |
| City | Aurora |
| Type | Roofing Contractor |
- BuildZoom verified this license was active as of June 2026.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | R110337 |
| Status | Active |
| County | Douglas County |
| Type | Roofing |
- BuildZoom verified this license was active as of July 2025.
Verify this license's status for Diller Mechanical Services at the Douglas County Building Division.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 1700406 |
| Status | Active |
| City | Westminster |
| Type | General Contractor |
| Date Issued | 08-08-2025 |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Diller Mechanical Services at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | CON-14-0153 |
| Status | Active |
| County | Boulder County |
| Type | New Roofing, Re Roofing |
- When BuildZoom last verified this license, it had an expiration date of April, 2026. Check the current license status of Diller Mechanical Services with the Boulder County Land Use Department
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | LCC2015062534 |
| Status | Active |
| City | Thornton |
| Type | Class D Roofing Expires 2026 08 08 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Diller Mechanical Services at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | GCC7418631 |
| Status | Active |
| City | Lafayette |
| Type | General Class C |
- When BuildZoom last verified this license, it had an expiration date of April, 2020. Check the current license status of Diller Mechanical Services with the City of Lafayette
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | LIC-0009957 |
| Status | Active |
| City | Boulder |
| Type | General Contractor |
| Class | Class D-2 Roofing |
- When BuildZoom last verified this license, it had an expiration date of December, 2018. Check the current license status of Diller Mechanical Services with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | LIC-0009054 |
| 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 Diller Mechanical Services with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 26702 |
| Status | Active |
| City | Thornton |
| Type | Roofing |
- When BuildZoom last verified this license, it had an expiration date of August, 2016. Check the current license status of Diller Mechanical Services with the Thornton City Development Contractor License
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 0009054 |
| Status | Active |
| City | Boulder |
| Type | Mechanical Class A All Umc Work |
- When BuildZoom last verified this license, it had an expiration date of June, 2016. Check the current license status of Diller Mechanical Services with the Boulder Licensing Board
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 9R-0820 |
| Status | Active |
| City | Arvada |
| Type | Bid Contractor, Roofing |
- When BuildZoom last verified this license, it had an expiration date of August, 2016. Check the current license status of Diller Mechanical Services with the The City of Arvada, Colorado
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | CEN-13-07277 |
| Status | Active |
| City | Centennial |
| Type | Trade Contractor |
- When BuildZoom last verified this license, it had an expiration date of August, 2016. Check the current license status of Diller Mechanical Services with the Centennial Community Development Contractor Licensing
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 24683 |
| Status | Active |
| City | Thornton |
| Type | Roofing |
- When BuildZoom last verified this license, it had an expiration date of August, 2016. Check the current license status of Diller Mechanical Services with the Thornton City Development Contractor License
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | AEC318 |
| 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.
Check this license's status for Diller Mechanical Services at the The City of Arvada, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1801205 |
| 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.
Check this license's status for Diller Mechanical Services at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | MEC3091682 |
| Status | Inactive |
| City | Lafayette |
| Type | Mechanical Contractor |
- According to the City of Lafayette, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the City of Lafayette.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| City | Denver |
| Type | D Roof Covering/Waterproofing |
- 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.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 110930043 |
| 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.
Check this license's status for Diller Mechanical Services at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | C016-0072 |
| Status | Inactive |
| County | Clear Creek County |
| Type | Contractor |
- According to the Clear Creek County, CO, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the Clear Creek County, CO.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | D40333 |
| Status | Inactive |
| City | Littleton |
| Type | Contractor |
- According to the The City of Littleton, CO, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the The City of Littleton, CO.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | D11047 |
| Status | Inactive |
| City | Littleton |
| Type | Class D |
- According to the The City of Littleton, CO, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the The City of Littleton, CO.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-16-0190 |
| Status | Inactive |
| County | Boulder County |
| Type | Commercial Mechanical Installations And Repair |
- According to the Boulder County Land Use Department, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the Boulder County Land Use Department.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | LCC2015060174 |
| Status | Inactive |
| City | Thornton |
| Type | Class D Roofing |
- According to the Thornton City Development Contractor License, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Diller Mechanical Services at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
108
BuildZoom Score
1.3K
Permits
- Building permit records show that Diller Mechanical Services has worked on 1336 permitted projects.
Diller Mechanical Services Employees
GI
Golden Spike Roofing Inc
Roofing
MM
Michael Mcarthy
Owner
MM
Michael Mccarthy
Owner
ND
Nate Diller
Owner
ND
Nathan Diller
Owner