Updated: May 12, 2026
Location and Projects
Address
24230 Roberts Drive, Black Diamond, WA, 98010
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Redline Mechanical Photos
Redline Mechanical
Redline Mechanical is a Black Diamond, Washington based Plumbing company providing Commercial and Residential plumbing and piping services tailored to the needs of our clients and their buildings. More than 25 years of experience has taught us that a project is more than just a job - it's your life's work. We want the experience you have with Redline to be the foundation of a lasting relationship!
From BuildZoom: Redline Mechanical, 24230 Roberts Dr, Black Diamond, WA (Employees: Nicole Mc Mahan and Ryan Mc Mahan) holds a Plumbing Contractor, Journey Level license and 4 other licenses according to the Tukwila license board.
Their BuildZoom score of 115 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 Redline Mechanical, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Redline Mechanical Contact Information
Phone Number: (360) 886-5129
Address: 24230 Roberts Drive, Black Diamond, WA 98010
Redline Mechanical Black Diamond
Quality
115
98th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Redline Mechanical has a BuildZoom score of 115, which places them above 98% of 128,670 contractors in Washington.
Activity
|
7 projects
|
2025 |
|
12 projects
|
2024 |
|
16 projects
|
2023 |
Our building permit records indicate that Redline Mechanical has worked on at least
35.0 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.
Pricing
|
3 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
1 project
|
$100k-$250k |
The typical size of their permits is approximately $24,000. 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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Install new 480v 100amp feeder from building meter switch gear for new service for t-mobile cell site. install new 480v 100amp local disconnect 50kva 480v to 120/240v transformer new 200amp ilc/mts panel 200amp remote mounted gen plug. install 2 emt fiber path (2) 2 emt pathway for dc power to cell equipment (2) 3 emt hybrid pathways - (5) feeder (3) low voltage (2) circuits (1) servi... see more
Valuation:
$186,000
Permit #:
ELEC-2022-06236
Status:
final
Fee:
$4,082
Permit Type:
N/A
Building Type:
N/A
Auburn medical center cath ir remodel: 12-fixtures, this project is located on level 1 of the olympic tower in the auburn medical center hospital. the project scope includes roughly 3, 000 sf of renovation space to a currently vacant area to create a new patient prep and recovery unit that will support the existing cath and ir imaging department. there will also be a new hvac unit ins... see more
Valuation:
N/A
Permit #:
PLM22-0157
Status:
final
Fee:
$303
Permit Type:
N/A
Building Type:
N/A
Type: plumbing non residential class: alteration to structure or system, , uw primary care kirkland: (bnr22-09065) demolish rough in and installing plumbing fixtures. installing (4) toilet; (4) bathroom sink; (27) sink; (2) hot water heater;
Valuation:
N/A
Permit #:
PNR22-09899
Status:
final
Fee:
$2,568
Permit Type:
N/A
Building Type:
N/A
Indigo-redmond - plumbing waste & vents for the exam rooms at the indigo clinic. - 2018 upc - (1) diswasher + (1) water heater + (9) bar sinks + (2) bathroom sinks + (1) floor sink + (2) toilets
Valuation:
$60,000
Permit #:
PLUM-2022-05811
Status:
final
Fee:
$1,113
Permit Type:
N/A
Building Type:
N/A
Water waste and vent - demolish existing fixtures and replacing with new fixtures
Valuation:
$160,000
Permit #:
P25003175
Status:
issued
Fee:
$776
Permit Type:
N/A
Building Type:
N/A
En to existing wiring connecting cook stove to existing wiring installing 2 island receptacles with existing wiring in the island installing 2 pendents with existing wiring installing hood vent receptacle with existing wiring. trim work. previous work done with other electrical company. (6) other 2020 nec unit c6
Valuation:
$1,500
Permit #:
ELEC-2022-02464
Status:
final
Fee:
$152
Permit Type:
N/A
Building Type:
N/A
Install new cell cabinet with 200amp feeder. install (3) cell equipment covps with dc power and install new led work light - 2020 nec - (1) feeder + (3) low voltage + (1) circuit
Valuation:
$20,850
Permit #:
ELEC-2022-07510
Status:
final
Fee:
$890
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
BP-23-00707
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Install new 2 conduit & 200amp feeder to new cell cabinet. install new (3) 2 conduit w dc wiring to new cell equipment. install new 2 conduit for fiber path. install new led site light - (1) feeder (1) circuits (3) other- 2020 nec
Valuation:
$27,000
Permit #:
ELEC-2021-07350
Status:
final
Fee:
$971
Permit Type:
N/A
Building Type:
N/A
E25-45684 otc plumbing work for new tenant communication resource nw kitchen; adding 1 dishwasher and 1 kitchen sink
Valuation:
N/A
Permit #:
PNR2025-41209
Status:
issued
Fee:
$290
Permit Type:
N/A
Building Type:
N/A
Install new 200amp feeder to new cell cabinet new fiber path and new dc power to covps- microsoft building 33 tmobile - (1) circuit (1) feeder (3) other - 2020 nec
Valuation:
$23,500
Permit #:
ELEC-2022-01652
Status:
final
Fee:
$942
Permit Type:
N/A
Building Type:
N/A
Ground restroom pvc waste/vent piping & new fixtures
Valuation:
N/A
Permit #:
P2505-040
Status:
final
Fee:
$87
Permit Type:
Standard plumbing...
Building Type:
N/A
Costco wholesale corp. plumbing a (nonresidential) (new) project involving 4 back flow preventer
Valuation:
N/A
Permit #:
PLM25-00116
Status:
final
Fee:
$318
Permit Type:
N/A
Building Type:
N/A
A nonresidential alteration to existing structure none project involving (1 toilet 1 bathroom sink 5 sink)
Valuation:
N/A
Permit #:
22 131646 BN
Status:
final
Fee:
$138
Permit Type:
N/A
Building Type:
N/A
Install new 200amp feeder to new t-mobile cell cabinet 2 conduit fiber pathway and (3) 2 conduit pathway with dc wiring to cell equipment - (1) feeder (10) low voltage - 2020 nec
Valuation:
$27,000
Permit #:
ELEC-2021-06988
Status:
final
Fee:
$971
Permit Type:
N/A
Building Type:
N/A
A nonresidential alteration to existing structure none project involving (getting future waste water and vents to future tenant improvement space)
Valuation:
N/A
Permit #:
22 105366 BN
Status:
final
Fee:
$52
Permit Type:
N/A
Building Type:
N/A
A nonresidential alteration to existing structure none project involving (getting future waste water and vents to future tenant improvement space)
Valuation:
N/A
Permit #:
22 105365 BN
Status:
final
Fee:
$52
Permit Type:
N/A
Building Type:
N/A
A nonresidential alteration to existing structure none project involving (1 toilet 1 bathroom sink 1 sink 1 water heater electric
Valuation:
N/A
Permit #:
21 134850 BN
Status:
final
Fee:
$89
Permit Type:
N/A
Building Type:
N/A
Costco plumbing, a (nonresidential) (alteration) project involving 1 back flow preventer
Valuation:
N/A
Permit #:
PLM23-00047
Status:
final
Fee:
$123
Permit Type:
N/A
Building Type:
N/A
Waste vent rain leaders new plumbing fixtures at oced
Valuation:
N/A
Permit #:
PLMB23-0853
Status:
issued
Fee:
$2,929
Permit Type:
plumbing commercial
Building Type:
N/A
Redline Mechanical Reviews
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Verified License
BuildZoom confirmed this contractor's license
Redline Mechanical License info
Verified License
| License # | REDLIM*790MK |
| Status | Active |
| City | Tukwila |
| Type | Plumbing Contractor, Journey Level |
| Class | Limited Liability Company |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Redline Mechanical at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | REDLIM*790MK |
| Status | Active |
| State | Washington |
| Type | Plumbing Contractor, Plumbing Contractor |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Redline Mechanical at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | REDLIM*835MM |
| Status | Active |
| City | Tukwila |
| Type | Construction Contractor, General |
| Class | Limited Liability Company |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Redline Mechanical at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | REDLIM*835MM |
| Status | Active |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Redline 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 # | REDLIM*835MM |
| Status | Inactive |
| City | Marysville |
| Type | Contractor |
| Business Type | Limited Liability Company |
- According to the The City of Marysville, Washington, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Redline Mechanical at the The City of Marysville, Washington.
This is a sample of licensing data; click here to access a complete history.
115
BuildZoom Score
Insured
| Insurer | Ohio Security Ins Co |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Wesco Insurance Co |
| Bond Value | $12,000 |
97
Permits
- Building permit records show that Redline Mechanical has worked on 97 permitted projects.
Redline Mechanical Employees
NM
Nicole Mc Mahan
President
RM
Ryan Mc Mahan
Sr. Project Manager