Updated: Jun 18, 2026
Location and Projects
Address
20018 Knollwood Dr, Saratoga, CA, 95070
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Earthquake Retrofit Photos
Earthquake Retrofit Construction
House Bolting, Foundation Bolting & Cripple Wall Bracing, Earthquake retrofit, earthquake preparation, foundation repair & earthquake safety
The main function of earthquake retrofit is to protect your building from sudden displaced of the concrete foundation. It helps to make the home safer and less prone to structural damage when an earthquake occurs. However, existing building has to be retrofitted because our understanding of construction techniques and earthquake safety has improved after the homes were built.
From BuildZoom: Earthquake Retrofit, 20018 Knollwood Dr, Saratoga, CA (Employee: Taye Van Nguyen) holds a General Building, Warm Air Heating, Ventilating And Air Conditioning license and 2 other licenses according to the California license board.
Their BuildZoom score of 129 ranks in the top 1% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Earthquake Retrofit, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Earthquake Retrofit Services
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Earthquake Retrofit Contact Information
Phone Number: (510) 648-9999
Address: 20018 Knollwood Dr, Saratoga, CA 95070
Earthquake Retrofit Saratoga
Quality
129
99th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Earthquake Retrofit has a BuildZoom score of 129, which places them above 99% of 336,931 contractors in California.
Activity
|
80 projects
|
2025 |
|
77 projects
|
2024 |
|
94 projects
|
2023 |
Our building permit records indicate that Earthquake Retrofit has worked on at least
251.0 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
|
9 projects
|
Home Additions |
|
3 projects
|
Commercial Renovations |
Analyzing permits over the last 4 years shows that Earthquake Retrofit mostly works on
home addition
and commercial renovation
projects.
Pricing
|
162 projects
|
< $5k |
|
43 projects
|
$5k-$20k |
|
2 projects
|
$50k-$100k |
The typical size of their permits is approximately $4,000. 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.
Earthquake Retrofit Reviews
5 out of 5 stars, based on
2
reviews
-
AnonymousDecember 27, 2018
-
By James V.August 1, 2018$5,500
This company is great! They quick to respond to my email communication. I talked to them and schedule for a inspection. There prices were way below other contractors. The work was done in 2 days and all the permitting and inspection where handled by them. I was definitely recommend anyone to use them
This is a sample of this contractor's permits. Click here to access their complete permit history.
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$4,900
Permit #:
BLD2025-05132
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$7,500
Permit #:
BLD2025-04255
Status:
issued
Fee:
$466
Permit Type:
Other
Building Type:
N/A
Earthquake retrofit- installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. residential seismic strengthening plan a
Valuation:
$3,700
Permit #:
BLD25-02072
Status:
issued
Fee:
$472
Permit Type:
N/A
Building Type:
N/A
Earthquake retrofit plan set a: proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,300
Permit #:
BLD2025-08216
Status:
complete
Fee:
$465
Permit Type:
Alteration
Building Type:
N/A
Residential addition alteration to existing residence
2025-12-15
Earthquake retrofit plan set a: proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
N/A
Permit #:
BLD2025-01414
Status:
final
Fee:
$855
Permit Type:
N/A
Building Type:
N/A
Installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$4,100
Permit #:
BLD2025-00721
Status:
final
Fee:
$328
Permit Type:
Alteration
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original and additional structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$4,100
Permit #:
BLD2025-05601
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-05600
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,900
Permit #:
BLD25-00687
Status:
final
Fee:
$456
Permit Type:
N/A
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-05488
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-05012
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,400
Permit #:
BLD2025-04840
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD25-00209
Status:
final
Fee:
$456
Permit Type:
N/A
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-04597
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-04593
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD2025-04592
Status:
final
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,500
Permit #:
BLD25-00164
Status:
issued
Fee:
$456
Permit Type:
N/A
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,700
Permit #:
BLD2025-04543
Status:
complete
Fee:
$465
Permit Type:
Other
Building Type:
N/A
Installation of seismic earthquake improvements (foundation anchors/plates and framing connectors structural foundation and framing modifications required by the engineered plan set). all work shall be performed according to the seismic strengthening plan. seismic retrofit in accordance with chapter a3 per engineered plans
Valuation:
N/A
Permit #:
DEV25-0053
Status:
final
Fee:
$1,348
Permit Type:
N/A
Building Type:
N/A
Proposal includes the installation of voluntary seismic improvements (foundation anchors/plates and framing connectors) within the crawlspace area of the original structure. all work shall be performed according to the residential seismic strengthening plan – standard plan set a
Valuation:
$3,700
Permit #:
BLD25-00089
Status:
final
Fee:
$456
Permit Type:
N/A
Building Type:
N/A
Verified License
BuildZoom confirmed this contractor's license
Earthquake Retrofit License info
Verified License
| License # | 1031584 |
| Status | Active |
| State | California |
| Type | General Building, Warm Air Heating, Ventilating And Air Conditioning |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Earthquake Retrofit at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 905867 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Earthquake Retrofit at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 696735 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Earthquake Retrofit at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
129
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
659
Permits
- Building permit records show that Earthquake Retrofit has worked on 659 permitted projects.
Earthquake Retrofit Employees
TN
Taye Van Nguyen
Sole Owner
I was very pleased with the quality of the retrofit work done by WNH Construction. The team arrived punctually on the scheduled date and completed the work in two days! The work area was left clean. The price was competitive including the additional work that needed to be done. I am pleased that I selected WNH Construction for this job and would highly recommend them