Updated: May 09, 2026
Location and Projects
Address
PO BOX 702, Fox Island, WA, 98333
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Cornerstone Constructors Llc
Cornerstone Constructors Llc, Fox Is, Po Box 702, Fox Island, WA (Owned by: Mackay, Jeffery Michael) holds a Construction Contractor, General license and 1 other license according to the Tukwila license board.
Their BuildZoom score of 102 ranks in the top 11% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Cornerstone Constructors Llc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Cornerstone Constructors Llc Services
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Cornerstone Constructors Llc Contact Information
Phone Number: (253) 377-5803
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Address: PO BOX 702, Fox Island, WA 98333
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Cornerstone Constructors Llc Fox Island
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Constructors Llc has a BuildZoom score of 102, which places them above 89% of 128,670 contractors in Washington.
Activity
|
1 project
|
2025 |
|
1 project
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Cornerstone Constructors Llc has worked on at least
3.0 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
|
1 project
|
$50k-$100k |
|
1 project
|
$100k-$250k |
|
1 project
|
$250k-$500k |
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 Cornerstone Constructors Llc
This is a sample of this contractor's permits. Click here to access their complete permit history.
The scope of work shall be the modification of an existing tenant space. the work shall include new tenant walls and cabinetry with new & existing doors to be relocated. the existing power & data systems will be modified within the space. the existing suspended acoustical ceiling & lighting will be repaired &/or modified within the space. **plumbing and mechanical work will require se... see more
Valuation:
$400,000
Permit #:
BLDCA22-0410
Status:
final
Fee:
$9,895
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Construction of demising walls to reduce suite premise and reconfigure areas within the existing commercial space. plumbing and mechanical scopes require separate permits
Valuation:
$197,000
Permit #:
BLDCA21-0440
Status:
final
Fee:
$5,448
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Alteration of 4 private offices located within suite 1750 of commercial building
Valuation:
$75,000
Permit #:
BLDCA25-0119
Status:
final
Fee:
$3,555
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Repurpose existing storage room into new idf location demolition of wall between two office for new conference room location. **mechanical scope requires a separate permit**
Valuation:
$105,000
Permit #:
BLDCA24-0354
Status:
final
Fee:
$4,248
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Modify suite to accommodate tenant's required building out. **approved revision through frc20-0092 - remove three (3) existing private offices to allow for additional systems furniture modify one (1) existing large conference room on the ne corner to create two (2) new private offices
Valuation:
$235,000
Permit #:
BLDCA20-0072
Status:
final
Fee:
$6,371
Permit Type:
N/A
Building Type:
N/A
Structural interior tenant impovement: work to include demolition of existing stairs between floors 20 & 21 partitions door act ceiling lighting casework and finishes. new work to include infill of existing stairs new partitions door act ceiling lighting and finishes
Valuation:
$75,000
Permit #:
BLDCA21-0004
Status:
final
Fee:
$2,863
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Minor alteration on floors 8 and 9 of propel insurance company. note: no plumbing or mechanical was reviewed under this permit. mechanical/plumbing indicated to be by separate permit
Valuation:
$76,500
Permit #:
BLDCA21-0304
Status:
final
Fee:
$2,912
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Renovate suite 2025 to accommodate new commercial tenant's layout. **plumbing and mechanical work will required separate permits**
Valuation:
$170,000
Permit #:
BLDCA21-0129
Status:
final
Fee:
$4,884
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Tenant improvement of suite 1625 - 2 228 sf of office space on the 16th floor
Valuation:
$124,000
Permit #:
BLDCA23-0469
Status:
final
Fee:
$4,606
Permit Type:
Remodel (T.I.)
Building Type:
N/A
Interior only tenant improvement totaling 1322 gsf consisting of additional staff only rooms including a lounge conference room 4 sleep rooms a shower and break room. plumbing and mechanical by separate permits
Valuation:
$177,000
Permit #:
BLDCA19-0052
Status:
final
Fee:
$4,764
Permit Type:
N/A
Building Type:
N/A
Renovation of 3rd floor waiting areas and single person restrooms including new plumbing and electrical fixtures and suspended ceiling system and finishes for franciscan urology associates. plumbing reviewed under this permit. separate permit must be obtained for mechanical
Valuation:
$255,000
Permit #:
BLDCA18-0101
Status:
complete
Fee:
$6,099
Permit Type:
N/A
Building Type:
N/A
Tenant improvements to existing office space - subdivision of an existing office to create two smaller offices creation of a 68 sf storage room
Valuation:
$300,000
Permit #:
BLDCA17-0284
Status:
final
Fee:
$6,508
Permit Type:
N/A
Building Type:
N/A
Install new suite entry doors and reconfigure office space to include reception conference break room and 6 private offices
Valuation:
$125,500
Permit #:
BLDCA18-0583
Status:
final
Fee:
$3,796
Permit Type:
N/A
Building Type:
N/A
Install demising wall to create new tenant suite due to downsize of suite 1502. install new suite entry door and relocate interior door to access conference room
Valuation:
$40,000
Permit #:
BLDCA18-0570
Status:
final
Fee:
$1,822
Permit Type:
N/A
Building Type:
N/A
Minor modification of existing suite on 19th floor of a commercial building
Valuation:
$100,000
Permit #:
BLDCA18-0419
Status:
final
Fee:
$3,278
Permit Type:
N/A
Building Type:
N/A
Remodel for expansion of tenant into existing unused space
Valuation:
$43,000
Permit #:
BLDCA19-0410
Status:
final
Fee:
$1,906
Permit Type:
N/A
Building Type:
N/A
Tenant improvement of existing spaces on the 8th 9th and 10th floors of the building. minor reconfiguration and replacement of existing finishes
Valuation:
N/A
Permit #:
BLDCA17-0231
Status:
final
Fee:
$10,606
Permit Type:
N/A
Building Type:
N/A
Construct interior remodel and addition to existing single family residence
Valuation:
$76,387
Permit #:
929287
Status:
final
Fee:
N/A
Permit Type:
A
Building Type:
Sfp
Interior renovation; room reconfiguration; relocation and construction of new rooms. interior finishes
Valuation:
$250,000
Permit #:
BLDCA17-0548
Status:
complete
Fee:
$5,646
Permit Type:
N/A
Building Type:
N/A
An interior tenant improvement to existing 2 story wood construction office building for highline community hospital. scope of work includes demolish of select non-bearing walls and installation of new non-bearing walls to create more office rooms. all existing carpet on bo
Valuation:
N/A
Permit #:
BLD-15-1664
Status:
complete
Fee:
$3,064
Permit Type:
N/A
Building Type:
N/A
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Cornerstone Constructors Llc Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Cornerstone Constructors Llc License info
Verified License
| License # | CORNECL887LM |
| 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 Cornerstone Constructors 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 # | CORNECL887LM |
| 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 Cornerstone Constructors Llc at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
Insured
| Insurer | Ohio Security Ins Co |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Contractors Bonding & Insurance Co |
| Bond Value | $12,000 |
17
Permits
- Building permit records show that Cornerstone Constructors Llc has worked on 17 permitted projects.
Cornerstone Constructors Llc Employees
JM
Jeffery Mackay
Manager
KM
Kevin Mackay
Partner/Member
MM
Mackay, Jeffery Michael
Owner
RM
Russell Mackay
Manager