Updated: Jun 24, 2026
Location and Projects
Address
1724 S Spokane St, Seattle, WA, 98144
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Knockout Plumbing & Mechanical Photos
Knockout Plumbing & Mechanical
Knockout Plumbing & Mechanical LLC is a local Seattle based company. Knockout strives to leave their clients with peace of mind when each job is said and done. From hydro jetting and repairing sewers to remodels/new construction we knock it out.
From BuildZoom: Knockout Plumbing & Mechanical, 1724 S Spokane St, Seattle, WA (Employees: Colin Forster, Randi Fairbourn, and Zachary Miller) holds a Plumbing Contractor, Residential license and 4 other licenses according to the Tukwila license board.
Their BuildZoom score of 116 ranks in the top 2% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Knockout Plumbing & Mechanical, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Knockout Plumbing & Mechanical Services
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Knockout Plumbing & Mechanical Contact Information
Phone Number: (206) 858-2211
Address: 1724 S Spokane St, Seattle, WA 98144
Knockout Plumbing & Mechanical Seattle
Quality
116
98th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Knockout Plumbing & Mechanical has a BuildZoom score of 116, which places them above 98% of 128,670 contractors in Washington.
Activity
|
3 projects
|
2025 |
|
7 projects
|
2024 |
|
12 projects
|
2023 |
Our building permit records indicate that Knockout Plumbing & Mechanical has worked on at least
22.0 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
|
Mechanical projects |
Analyzing permits over the last 4 years shows that Knockout Plumbing & Mechanical mostly works on
mechanical project
projects.
Pricing
|
1 project
|
< $5k |
|
2 projects
|
$5k-$20k |
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 Knockout Plumbing & Mechanical
This is a sample of this contractor's permits. Click here to access their complete permit history.
Side sewer side sewer repair w lining. separate or revised side sewer permit will be required for new construction planned on this property once the building permit is issued. note: a pe eval/cert will be required - record video of pipe before and after liner to send to the engineer
Valuation:
$4,500
Permit #:
6973101-SS
Status:
issued
Fee:
$280
Permit Type:
None
Building Type:
Single family/duplex
Type: plumbing single family class: alteration to structure or system, , kuimjian (bsf22-03916)-(1)toilet; (2)bathroom sink; (1)shower tub or combo
Valuation:
N/A
Permit #:
PSF23-05290
Status:
complete
Fee:
$112
Permit Type:
N/A
Building Type:
N/A
Tie in adu sewer main into neighbors yard sdr35. directionally bore new 1inch pex water main from front of house to backyard garage. travel; setup of drill; vac system. installation of up to 140feet of 2inch conduit for water line sleeve
Valuation:
N/A
Permit #:
23 123506 UA
Status:
final
Fee:
$630
Permit Type:
N/A
Building Type:
N/A
Addition and renovation of existing single family home to include expanded living area enlarged bedrooms and accessory dwelling unit. additional lot coverage = 328 sf. includes clearing & grading inspection for drains. **add on mechanical. **add on plumbing. **add on electrical
Valuation:
N/A
Permit #:
21 116210 BR
Status:
final
Fee:
$7,691
Permit Type:
N/A
Building Type:
N/A
E23-27649 clothes washer (1) ice maker (1) shower/tub/combo (1) toilet (2) bathroom sink (2) kitchen sink (1)m piping - water service
Valuation:
N/A
Permit #:
PLM-23-1343
Status:
issued
Fee:
$261
Permit Type:
N/A
Building Type:
N/A
Plumbing a (single family residential) (alteration) project involving 1 toilet 2 sink 1 shower tub or combo 4 total number of fixtures being added or altered single family dwelling
Valuation:
N/A
Permit #:
PLM22-0053
Status:
issued
Fee:
$88
Permit Type:
N/A
Building Type:
N/A
Replacement of water line at single family dwelling. no row
Valuation:
$10,000
Permit #:
WATER24-0066
Status:
final
Fee:
$123
Permit Type:
N/A
Building Type:
N/A
Plumbing fixtures one (1) water tank four (4) lavs two (2) water closets two (2) sinks one (1) shower two (2) tubs one (1) washer
Valuation:
N/A
Permit #:
2021.0075.PP
Status:
filed
Fee:
$5,001
Permit Type:
Add/rem single fa...
Building Type:
N/A
A single family residential alteration to existing structure none project involving (1 toilet 1 bathroom sink 1 shower tub or combo 1 kitchen sink 1 water heater electric
Valuation:
N/A
Permit #:
23 123790 BN
Status:
final
Fee:
$208
Permit Type:
N/A
Building Type:
N/A
A single family residential alteration to existing structure none project involving (1 toilet 1 bathroom sink 1 shower tub or combo)
Valuation:
N/A
Permit #:
24 125359 BN
Status:
final
Fee:
$96
Permit Type:
N/A
Building Type:
N/A
1 kitchen 1 lav 1 dishwasher for remodel
Valuation:
$6,850
Permit #:
BLD2025-0227
Status:
applied
Fee:
$346
Permit Type:
N/A
Building Type:
Commercial - plum...
A single family residential repair or replacement none project involving (1 water service - 1 1 pressure reducing valve)
Valuation:
N/A
Permit #:
24 119512 BN
Status:
canceled
Fee:
$34
Permit Type:
N/A
Building Type:
N/A
E22-19176 sf dwelling alteration mechanical - gas piping only (no fixture installation) gas - barbecue (1) gas - stove or cook top (1)
Valuation:
N/A
Permit #:
MEC-22-0823
Status:
expired
Fee:
$243
Permit Type:
N/A
Building Type:
N/A
Two dogwoods llc plumbing, a (single family residential) (repair or replacement) project involving 2 toilet
Valuation:
N/A
Permit #:
PLM22-00077
Status:
final
Fee:
$55
Permit Type:
N/A
Building Type:
N/A
Gas rough in for 4 fixtures including a tankless water heater
Valuation:
N/A
Permit #:
BLD2023-0461
Status:
issued
Fee:
$112
Permit Type:
N/A
Building Type:
Residential - mec...
A single family residential repair or replacement project installing {4-shower tub or combo} 21116045bt
Valuation:
N/A
Permit #:
21 116046 BN
Status:
final
Fee:
$89
Permit Type:
N/A
Building Type:
N/A
E22-34151 gas - water heater (1)
Valuation:
N/A
Permit #:
MEC-22-1504
Status:
complete
Fee:
$81
Permit Type:
N/A
Building Type:
N/A
Repipe of existing plumbing
Valuation:
N/A
Permit #:
BLD2022-1376
Status:
issued
Fee:
$204
Permit Type:
N/A
Building Type:
Residential - plu...
Commercial apply credit
Valuation:
$3,000
Permit #:
OL22-2448
Status:
canceled
Fee:
$110
Permit Type:
plumbing
Building Type:
N/A
One-stop pantry: reconfigure plumbing to ice maker
Valuation:
N/A
Permit #:
PLM21-0209
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Knockout Plumbing & Mechanical License info
License Not Verified
| License # | KNOCKPM782DB |
| Status | Active |
| City | Tukwila |
| Type | Plumbing Contractor, Residential |
| Class | Limited Liability Company |
| Business Type | Limited Liability Company (Llc) |
- When BuildZoom last verified this license, it had an expiration date of March, 2026. Check the current license status of Knockout Plumbing & Mechanical with the The City of Tukwila, WA
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | KNOCKPM782DB |
| Status | Active |
| State | Washington |
| Type | Plumbing Contractor, Plumbing Contractor |
| Business Type | Limited Liability Company (Llc) |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Knockout Plumbing & Mechanical at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | KNOCKPM817J2 |
| Status | Inactive |
| City | Tukwila |
| Type | Construction Contractor, General |
| Class | Limited Liability Company |
| Business Type | Limited Liability Company (Llc) |
- According to the The City of Tukwila, WA, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Knockout Plumbing & Mechanical at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | KNOCKPM817J2 |
| Status | Inactive |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Business Type | Limited Liability Company (Llc) |
- According to the Washington State Department of Labor & Industries, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Knockout Plumbing & Mechanical at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | KNOCKPM817J2 |
| Status | Inactive |
| State | Washington |
| Type | Construction Contractor, General |
| Business Type | Limited Liability Company (Llc) |
- According to the Washington State Department of Labor & Industries, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Knockout Plumbing & Mechanical at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
116
BuildZoom Score
Insured
| Insurer | Liberty mutual business center |
| Insured up to | $100,000,0/2,000,000 |
Bonded
| Bonded Agent | Hudson insurance company |
| Bond Value | $12,000 |
Insured
| Workers Comp Provider | Labor and Industries |
40
Permits
- Building permit records show that Knockout Plumbing & Mechanical has worked on 40 permitted projects.
Knockout Plumbing & Mechanical Employees
Colin Forster
Service Technician
Randi Fairbourn
Office Manager
Zachary Miller
Owner, Master Plumber
This Contractor Endorses
Seattle, WA