Updated: May 15, 2026
Location and Projects
Address
4912 28th Ave S, Seattle, WA, 98108
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Duo Tec HVAC/Mechanical Contractor
Duo Tec, 4912 28th Ave S, Seattle, WA (Employees: Cun, Duong A and Duong Cun) holds a Construction Contractor, General license and 3 other licenses according to the Tukwila license board.
Their BuildZoom score of 107 ranks in the top 6% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Duo Tec, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Duo Tec Contact Information
Phone Number: (206) 768-6587
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Address: 4912 28th Ave S, Seattle, WA 98108
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Duo Tec Seattle
Quality
107
94th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Duo Tec has a BuildZoom score of 107, which places them above 94% of 128,670 contractors in Washington.
Activity
|
5 projects
|
2025 |
|
5 projects
|
2024 |
|
6 projects
|
2023 |
Our building permit records indicate that Duo Tec has worked on at least
16.0 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
|
HVAC projects |
|
8 projects
|
Mechanical projects |
Analyzing permits over the last 4 years shows that Duo Tec mostly works on
hvac project
and mechanical project
projects.
Pricing
|
1 project
|
< $5k |
|
6 projects
|
$5k-$20k |
|
2 projects
|
$20k-$50k |
|
2 projects
|
$50k-$100k |
|
1 project
|
$100k-$250k |
The typical size of their permits is approximately $9,400. 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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace like in kind 3 existing rooftop heatpump condenser units and 3 indoor air handlers. replace like in kind one existing rooftop heatpump package unit with economizer
Valuation:
$68,000
Permit #:
MECHC23-0033
Status:
final
Fee:
$1,380
Permit Type:
Remodel
Building Type:
N/A
Duong cun replace 7 package units with split system heatpumps and addition 7 relief fans. replace 2 air to split system heatpumps
Valuation:
$140,000
Permit #:
6945873-ME
Status:
withdrawn
Fee:
$1,123
Permit Type:
N/A
Building Type:
Commercial
Type: mechanical non residential class: replacement, , heatpump replacement- (3)condenser or chiller; (3)air handler; mechanical equipment per plans; (6)total number of appliances; rooftop unit
Valuation:
N/A
Permit #:
MNR22-08911
Status:
final
Fee:
$1,642
Permit Type:
N/A
Building Type:
N/A
Duong cun replace existing oil furnace with new mitsubishi mini split system. 1 out door condenser unit 1indoor air handler and 1 ceiling ductless cassette
Valuation:
$19,000
Permit #:
6952615-FR
Status:
complete
Fee:
$168
Permit Type:
N/A
Building Type:
Single family/duplex
Duong cun install one 2 ton heatpump with 3 indoor ductless cassette units. 2 bathroom exhaust fans 1 whole house exhaust fan one kitchen exhaust and dryer exhaust
Valuation:
$11,000
Permit #:
7061419-FR
Status:
issued
Fee:
$56
Permit Type:
N/A
Building Type:
Single family/duplex
Duong cun replace flex duct with silver install new supply duct remove heat pump from ceiling to repair wall and re-install. stfi (subject to field inspection)
Valuation:
$5,400
Permit #:
7020722-ME
Status:
complete
Fee:
$459
Permit Type:
N/A
Building Type:
Commercial
Duong cun 1st floor install one 2 ton air coil and modify existing ductwork to accommodate new floor plan. 2nd floor-install one 2 ton ducted split system heatpump with supply and return air duct. replace bathroom fans and install new kitchen hoods
Valuation:
$24,000
Permit #:
6922477-FR
Status:
issued
Fee:
$159
Permit Type:
N/A
Building Type:
Single family/duplex
Duong cun install one 3 ton heatpump to existing gas furnace
Valuation:
$5,200
Permit #:
7091190-FR
Status:
complete
Fee:
$59
Permit Type:
N/A
Building Type:
Single family/duplex
Duong cun replace one existing 5 ton split system heatpump
Valuation:
$7,000
Permit #:
7081784-RF
Status:
issued
Fee:
$130
Permit Type:
N/A
Building Type:
Commercial
A single family residential alteration to existing structure none project involving (1 ductless heat pump)
Valuation:
N/A
Permit #:
25 115896 BK
Status:
issued
Fee:
$76
Permit Type:
N/A
Building Type:
N/A
Duong cun install one 3 ton split system heatpump
Valuation:
$7,800
Permit #:
7091059-RF
Status:
complete
Fee:
$77
Permit Type:
N/A
Building Type:
Single family/duplex
Project name: mechanical, , a (single family residential) (repair or replacement) project involving 1 heat pump
Valuation:
N/A
Permit #:
MECH24-129
Status:
final
Fee:
$86
Permit Type:
N/A
Building Type:
N/A
Epermit description of work: install 2 heatpumps with erv ductwork and diffusers. 2 units heaters 4 bathroom exhaust fans kitchen hood and laundry exhaust
Valuation:
N/A
Permit #:
20106936KM
Status:
final
Fee:
$291
Permit Type:
N/A
Building Type:
N/A
Duong cun replace 2 existing split system heatpump. replace 7 package units and convert to heatpump
Valuation:
$48,000
Permit #:
6945877-RF
Status:
issued
Fee:
$384
Permit Type:
N/A
Building Type:
Commercial
Duong cun install mini split system. one ducted air handler and one ductless
Valuation:
$3,000
Permit #:
6952617-RF
Status:
complete
Fee:
$87
Permit Type:
N/A
Building Type:
Single family/duplex
1 gas piping
Valuation:
N/A
Permit #:
2504-219
Status:
final
Fee:
$209
Permit Type:
N/A
Building Type:
N/A
Ryan cun replace existing supply air diffusers; relocate air handlers; reroute duct to accommodate new floor plan per plan. subject to field inspection (stfi)
Valuation:
$12,700
Permit #:
6750008-ME
Status:
complete
Fee:
$507
Permit Type:
N/A
Building Type:
Commercial
Duong cun install one 5 ton split system heatpump
Valuation:
$7,000
Permit #:
7042206-RF
Status:
issued
Fee:
$72
Permit Type:
N/A
Building Type:
Commercial
Replacing air conditioning units boiler atus and one ahu. business license#: 500077957
Valuation:
$225,000
Permit #:
MECHC19-0116
Status:
final
Fee:
$3,441
Permit Type:
Remodel
Building Type:
N/A
Install one heatpump with 5 ductless air handlers
Valuation:
N/A
Permit #:
OTC24-1835
Status:
final
Fee:
$274
Permit Type:
N/A
Building Type:
N/A
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Projects
Duo Tec Reviews
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Verified License
BuildZoom confirmed this contractor's license
Duo Tec License info
Verified License
| License # | DUOTE**044KG |
| Status | Active |
| City | Tukwila |
| Type | Construction Contractor, General |
| Class | Corporation |
| Business Type | Corporation |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Duo Tec at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | DUOTE**044KG |
| Status | Active |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Business Type | Corporation |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Duo Tec at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | DUOTE044KG |
| Status | Active |
| State | Washington |
| Type | Construction Contractor |
| Business Type | Corporation |
- When BuildZoom last verified this license, it had an expiration date of April, 2019. Check the current license status of Duo Tec with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | DUOTE 044KG |
| Status | Active |
| State | Washington |
| Type | Construction Contractor, Heating/Vent/Air-Conditioning And Refrig Hvac/R |
| Business Type | Corporation |
- When BuildZoom last verified this license, it had an expiration date of April, 2017. Check the current license status of Duo Tec with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.
107
BuildZoom Score
Insured
| Insurer | West American Ins Co |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Contractors Bonding & Insurance Co |
| Bond Value | $12,000 |
117
Permits
- Building permit records show that Duo Tec has worked on 117 permitted projects.
Duo Tec Employees
CA
Cun, Duong A
President
DC
Duong Cun
President