Updated: May 12, 2026
Location
Address
6542 KEY WAY, Deer Park, WA, 99006
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509 Siteworx Construction
509 Siteworx LLC, 6542 Key Way, Deer Park, WA (Owned by: Phillips, Mathew E) holds a Construction Contractor, Excavation, Grading And Land Clearing license and 1 other license according to the Tukwila license board.
Their BuildZoom score of 94 ranks in the top 24% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring 509 Siteworx LLC, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
509 Siteworx LLC Services
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509 Siteworx LLC Contact Information
Phone Number: (925) 453-1636
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Address: 6542 KEY WAY, Deer Park, WA 99006
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Verified License
BuildZoom confirmed this contractor's license
509 Siteworx LLC License info
Verified License
| License # | 509SISL753LO |
| Status | Active |
| City | Tukwila |
| Type | Construction Contractor, Excavation, Grading And Land Clearing |
| Class | Limited Liability Company |
| Date Issued | 06-20-2025 |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for 509 Siteworx LLC at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 509SISL753LO |
| Status | Active |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Date Issued | 06-20-2025 |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for 509 Siteworx LLC at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
94
BuildZoom Score
Insured
| Insurer | Country Mutual Ins Co |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Old Republic Surety Co |
| Bond Value | $15,000 |
509 Siteworx LLC Employees
MP
Mathew Phillips
Partner/Member
PE
Phillips, Mathew E
Owner
RH
Robert Hendrickson
Partner/Member