Updated: May 17, 2026
Location and Projects
Address
3251 NAPA DR, San Jose, CA, 95148
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Hien Architect
Hien, 3251 Napa Dr, San Jose, CA (Owned by: Nguyen Hien Thanh) holds a Architect license and 6 other licenses according to the California license board.
Their BuildZoom score of 108 ranks in the top 5% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Hien, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Hien Services
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Hien San Jose
Quality
108
95th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Hien has a BuildZoom score of 108, which places them above 95% of 336,931 contractors in California.
Activity
|
13 projects
|
2025 |
|
11 projects
|
2024 |
|
6 projects
|
2023 |
Our building permit records indicate that Hien has worked on at least
30.0 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
|
11 projects
|
Home Additions |
Analyzing permits over the last 4 years shows that Hien mostly works on
home addition
projects.
Pricing
|
1 project
|
< $5k |
|
2 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
5 projects
|
$50k-$100k |
|
7 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $80,000. 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.
*for certificate of occupancy: convert level 2: 336 sq ft to adu with 1 bedroom livingroom kitchen washer dryer attic new subpanel tankless water heater minisplit - 336 sq ft (bldg/mech/elec/plumbing) *main address is 1727 minturn st units a b c. new attached adu address is 1727 minturn st unit d **shared plans cb25-0132 and adu25-0026 *connected to pln24-0545 **new electrical meter u... see more
Valuation:
$80,000
Permit #:
ADU25-0026
Status:
issued
Fee:
$8,665
Permit Type:
N/A
Building Type:
N/A
Lower level garage space to be converted to family room w kithchenette & bathrm. upper floor unpermitted rear addition will be brought to code & permitted. re-route plumbing to accomidate lower bathrm & kitchenette, run (n) electrical for lower living area, upper level partition wall to be removed
Valuation:
$65,000
Permit #:
202402015042
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Nair residence: rear addition on first floor (172 sf) to exp
Valuation:
$70,000
Permit #:
B-BP25-0209
Status:
final
Fee:
$4,012
Permit Type:
Remodel-addition
Building Type:
N/A
New 4 story type va 8 unit apartment building over 1 level type 1a subterranean garage. revise parking???
Valuation:
$1,500,000
Permit #:
18010-10000-06303
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Hvac conversion gas to electrical
Valuation:
$18,000
Permit #:
24-07670
Status:
final
Fee:
$301
Permit Type:
Residential mecha...
Building Type:
N/A
(e-plan) ev charger in garage
Valuation:
N/A
Permit #:
00952921-MISR
Status:
final
Fee:
$86
Permit Type:
N/A
Building Type:
N/A
Site grading excavation backfill of basement and retaining wall for new 4 story 8 unit apartment with one level subterannean parking garage (18010-10k-06303)
Valuation:
$1,750
Permit #:
18030-10000-08762
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Rem 1465 w pem *swo*
Valuation:
$262,490
Permit #:
B19-014284
Status:
final
Fee:
$4,430
Permit Type:
N/A
Building Type:
N/A
Adu permit
Valuation:
$80,000
Permit #:
PREBLD25-0267
Status:
approved
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Grading permit for r&r for building pad/pkg lot excavation/backfill of proposed basement walls. and site grading for uncovered parking lot
Valuation:
$2,450
Permit #:
16030-30000-01401
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
New 2-story 10 unit apartment building (type v-a) over one level sub parking (type i-b)
Valuation:
$2,000,000
Permit #:
16010-30000-04499
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Le residence: revisions to original approved but not issued
Valuation:
N/A
Permit #:
B-RV24-0178
Status:
issued
Fee:
$797
Permit Type:
Revision
Building Type:
N/A
Le residence: revisions to original approved but not issued
Valuation:
N/A
Permit #:
B-RV24-0098
Status:
final
Fee:
$540
Permit Type:
Revision
Building Type:
N/A
Tenant improvement (reconfigure unit layout by merging
Valuation:
$50,000
Permit #:
BCOM2024-0087
Status:
filed
Fee:
$2,541
Permit Type:
Alteration
Building Type:
N/A
Le residence- unit 204: addition (865sf) to rear to create a bed
Valuation:
$200,000
Permit #:
B-BP22-0103
Status:
final
Fee:
$7,270
Permit Type:
Remodel-addition
Building Type:
N/A
Dong 4-plex: new (700 sqft) detached adu on the same parcel
Valuation:
$150,000
Permit #:
B-BP21-0211
Status:
final
Fee:
$5,592
Permit Type:
Detached adu
Building Type:
N/A
Convert duplex to 4 units (3 regular 1 low income) apartment building per unpermitted dwelling unit ordinance
Valuation:
$10,000
Permit #:
19016-10000-17753
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Dong apartment: new (700 sqft) detached adu on the same parc
Valuation:
N/A
Permit #:
B-EL21-0394
Status:
final
Fee:
N/A
Permit Type:
Electrical
Building Type:
N/A
Dong 4-plex: address request for new (700 sqft) detached adu
Valuation:
N/A
Permit #:
B-AC22-0020
Status:
final
Fee:
$648
Permit Type:
Detached adu
Building Type:
N/A
Enf-2023-00196 - legalize unpermitted conversion of garage and part of main house into (n) 966 sf 2-bedroom 1-bath attached adu with (n) heat pump hvac 100a electric meter panel and tankless water heater
Valuation:
$207,680
Permit #:
BRADU-24-0059
Status:
triage
Fee:
$4,585
Permit Type:
N/A
Building Type:
N/A
Hien Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Hien License info
Verified License
| License # | C37206 |
| Status | Active |
| State | California |
| Type | Architect |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of July 2025.
Verify this license's status for Hien at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | C36454 |
| Status | Active |
| State | California |
| Type | Architect |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of August 2025.
Verify this license's status for Hien at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 834919 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Class | B |
| 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.
Check this license's status for Hien at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1118226 |
| Status | Inactive |
| State | California |
| Type | Electrical |
| 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.
Check this license's status for Hien at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 7083 |
| Status | Inactive |
| State | California |
| Type | Interior Designer |
| Business Type | Sole Ownership |
- According to the California Council for Interior Design Certification, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Hien at the California Council for Interior Design Certification.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 834919 |
| 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.
Check this license's status for Hien at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 921686 |
| Status | Inactive |
| State | California |
| Type | Flooring And Floor Covering |
| 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.
Check this license's status for Hien at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
108
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $12,500 |
147
Permits
- Building permit records show that Hien has worked on 147 permitted projects.
Hien Employees
HN
Hien Duy Nguyen
Sole Owner
JN
James Thanh Nguyen
Sole Owner
NT
Nguyen Hien Thanh
Owner