Updated: Apr 20, 2026
Location and Projects
Address
PO BOX 6056, Eureka, CA, 95502
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Cornerstone Construction & Sons
Cornerstone Construction & Sons, Eureka, Po Box 6056, Eureka, CA (Owned by: William Thomas Lenhoff) holds a General Building, Concrete license and 3 other licenses according to the California license board.
Their BuildZoom score of 101 ranks in the top 12% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Cornerstone Construction & Sons, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Cornerstone Construction & Sons Services
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Cornerstone Construction & Sons Contact Information
Phone Number: (707) 444-9189
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Address: PO BOX 6056, Eureka, CA 95502
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Cornerstone Construction & Sons Eureka
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Construction & Sons has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
2 projects
|
2023 |
Our building permit records indicate that Cornerstone Construction & Sons has worked on at least
2.0 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
|
$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.
Cornerstone Construction & Sons Reviews
5 out of 5 stars, based on
1
review
-
By Jeanne G.January 23, 2017Gas fireplace insert$3,0003 days
Building Permits by Cornerstone Construction & Sons
This is a sample of this contractor's permits. Click here to access their complete permit history.
Construct 3 bedroom 1778 sf residence w 321 sf covered porches (existing residence damaged by tree to be demolished)
Valuation:
$268,224
Permit #:
BLD-2022-57369
Status:
issued
Fee:
$9,633
Permit Type:
Residential
Building Type:
N/A
Remove (e) door and install sliding door and accessible ramp
Valuation:
$16,400
Permit #:
B21-0436
Status:
issued
Fee:
$1,019
Permit Type:
N/A
Building Type:
N/A
Install 40x12 mural on the exterior of building
Valuation:
$3,475
Permit #:
B21-0449
Status:
issued
Fee:
$205
Permit Type:
N/A
Building Type:
N/A
Install ada ramp
Valuation:
$5,450
Permit #:
B21-0656
Status:
issued
Fee:
$588
Permit Type:
N/A
Building Type:
N/A
It name: infill door and install gas fireplace per plan
Valuation:
$12,000
Permit #:
B19-0112
Status:
issued
Fee:
$539
Permit Type:
N/A
Building Type:
N/A
Accessible ramp per plan
Valuation:
$8,500
Permit #:
B19-0578
Status:
issued
Fee:
$709
Permit Type:
N/A
Building Type:
N/A
Removal of damaged portion of chimney
Valuation:
N/A
Permit #:
B23-0188
Status:
issued
Fee:
$3
Permit Type:
N/A
Building Type:
N/A
Close sidewalk as needed for landscaping on private property
Valuation:
$0
Permit #:
E15-0022
Status:
UNDER REVIEW
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
Close sidewalk as needed for landscaping on private property
Valuation:
$0
Permit #:
E15-0020
Status:
ISSUED
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
Repairs per scope dated9/1/15
Valuation:
N/A
Permit #:
B15-0648
Status:
issued
Fee:
$132
Permit Type:
N/A
Building Type:
N/A
New ada enterance & entry way enclosure
Valuation:
$25,000
Permit #:
B15-0323
Status:
issued
Fee:
$1,871
Permit Type:
N/A
Building Type:
N/A
Close sidewalk as needed to inspect and repair facade
Valuation:
$0
Permit #:
E15-0010
Status:
ISSUED
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
Repair chimney as per scope
Valuation:
$3,000
Permit #:
B20-0419
Status:
issued
Fee:
$181
Permit Type:
N/A
Building Type:
N/A
Repair defective sidewalk at owner's initiative
Valuation:
$0
Permit #:
A15-0008
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repairs to sunroom per engineers report
Valuation:
$25,500
Permit #:
B20-0330
Status:
issued
Fee:
$1,367
Permit Type:
N/A
Building Type:
N/A
Construct concrete walk & 12 planter within right-of-way
Valuation:
$0
Permit #:
A14-0004
Status:
ISSUED
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
Replace & repair sidewalk addition private street trees
Valuation:
$0
Permit #:
A14-0001
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Fau air handling units
Valuation:
N/A
Permit #:
B15-0433
Status:
issued
Fee:
$168
Permit Type:
N/A
Building Type:
N/A
Convert storage to restroom
Valuation:
$16,500
Permit #:
B16-0288
Status:
final
Fee:
$711
Permit Type:
N/A
Building Type:
N/A
Close parking lane sidewalk & portion of alley for paintin
Valuation:
$0
Permit #:
E12-0035
Status:
ISSUED
Fee:
$200
Permit Type:
N/A
Building Type:
N/A
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Cornerstone Construction & Sons License info
Verified License
| License # | 986270 |
| Status | Active |
| State | California |
| Type | General Building, Concrete |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Cornerstone Construction & Sons at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 903224 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Cornerstone Construction & Sons at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 606604 |
| Status | Inactive |
| State | California |
| Type | General Building, Concrete |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Cornerstone Construction & Sons at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 926421 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Cornerstone Construction & Sons at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
101
BuildZoom Score
Bonded
| Bonded Agent | Western Surety Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Everest Premier Insurance Company |
59
Permits
- Building permit records show that Cornerstone Construction & Sons has worked on 59 permitted projects.
Cornerstone Construction & Sons Employees
CL
Cara Marie Lenhoff
Officer
KL
Kathleen Louise Lenhoff
Officer
SA
Saul Avila
Sole Owner
SA
Saul Avila
Sole Owner
WL
William Thomas Lenhoff
Owner
YL
Yeon Jae Lee
Sole Owner
Cornerstone installed a gas fire unit in my existing fireplace. Before I found Cornerstone I had been told it could not be done because my fireplace was too small. Bill, the owner knew exactly what to do. They tented the area, cut the brick and masonary for the new unit and did a perfect job with the installation. They even added an easy access panel to turn off the gas if it is ever needed, and repainted the wall. Their entire crew were a delight to work with.