Updated: Apr 30, 2026
Location and Projects
Address
2470 CONISTON PLACE, San Marino, CA, 91108
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Chien Sean Yuan Construction
Serving the San Marino, California area, Chien Sean Yuan brings over two decades of experience to residential construction and remodeling projects. With 21 years in the industry, the company focuses on homes in San Marino and surrounding communities throughout Los Angeles County. Services include home renovations, additions, and new construction, tailored to the needs of homeowners seeking to update or expand their properties. The contractor manages projects ranging from structural updates to interior improvements, with an emphasis on residential building codes and local standards. Chien Sean Yuan maintains direct oversight of each project to ensure work is delivered according to plan and client specifications. The company is familiar with the permitting process and works with homeowners to achieve their goals within regulatory requirements.
Chien Sean Yuan Services
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Chien Sean Yuan Contact Information
Phone Number: (626) 641-9789
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Address: 2470 CONISTON PLACE, San Marino, CA 91108
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Chien Sean Yuan San Marino
Quality
95
78th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Chien Sean Yuan has a BuildZoom score of 95, which places them above 78% of 336,931 contractors in California.
Activity
|
1 project
|
2025 |
|
1 project
|
2024 |
Our building permit records indicate that Chien Sean Yuan has worked on at least
2.0 projects over the past 2 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
|
$100k-$250k |
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.
New residential 1, 670 sq. ft. with attached 2-car garage 420 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area. house meter sump pump subpanel for pump trash enclosure 8 6 x 19 perimter north wall 6 x 300. est wall 6 x 50
Valuation:
$242,363
Permit #:
B18-1123
Status:
final
Fee:
$19,132
Permit Type:
N/A
Building Type:
N/A
Convert existing detached guest house to an adu 891 sq. ft. one bedroom and one bathroom
Valuation:
$106,000
Permit #:
B23-1212
Status:
issued
Fee:
$6,563
Permit Type:
N/A
Building Type:
N/A
New residential 1, 784 sq. ft. with attached 2-car garage 417 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area. trellis 250 sq. ft. 20 l
Valuation:
$223,996
Permit #:
B18-1119
Status:
final
Fee:
$18,462
Permit Type:
N/A
Building Type:
N/A
New residential 2, 106 sq. ft. with attached 2-car garage 420 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area. 2.5l
Valuation:
$244,155
Permit #:
B18-1121
Status:
final
Fee:
$19,122
Permit Type:
N/A
Building Type:
N/A
New residential 1, 975 sq. ft. with attached 2-car garage 420 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area 2.5l
Valuation:
$230,198
Permit #:
B18-1122
Status:
final
Fee:
$18,625
Permit Type:
N/A
Building Type:
N/A
New residential 1, 928 sq. ft. with attached 2-car garage 420 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area. 20l
Valuation:
$227,996
Permit #:
B18-1120
Status:
final
Fee:
$18,557
Permit Type:
N/A
Building Type:
N/A
New residential 2, 000 sq. ft. with attached 2-car garage 417 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area.16 l
Valuation:
$234,869
Permit #:
B18-1118
Status:
final
Fee:
$18,721
Permit Type:
N/A
Building Type:
N/A
New residential 2, 000 sq. ft. with attached 2-car garage 417 sq. ft. 6 block wall 2'6 block with 3'6 wrought iron on tip for priivate open space area. 16 l
Valuation:
$234,869
Permit #:
B18-1116
Status:
final
Fee:
$19,244
Permit Type:
N/A
Building Type:
N/A
Remodeling existing house including first floor entry area kitchen and laundry; second floor master bathroom and walk-in closet. related to adu b23-1212
Valuation:
$100,000
Permit #:
B23-1233
Status:
final
Fee:
$5,750
Permit Type:
N/A
Building Type:
N/A
New residential 2, 147 sq. ft. with attached 2-car garage 417 sq. ft
Valuation:
$247,890
Permit #:
B18-1117
Status:
final
Fee:
$19,293
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
14041-20001-20727
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Photovoltaic system
Valuation:
N/A
Permit #:
00538659-RRA
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Solid roof gazebo
Valuation:
N/A
Permit #:
00402741-RRA
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
5 hosebibbs for construction
Valuation:
N/A
Permit #:
B19-1027
Status:
expired
Fee:
$167
Permit Type:
N/A
Building Type:
N/A
Retaining wall related to b18-1116 through b18-1123. 2 retaining wall 1 footing 4 8"block wall on top 2 fence on top. 3 retaining wall 1 footing 4 8"block wall on top 2 fence on top
Valuation:
$72,275
Permit #:
B19-0513
Status:
final
Fee:
$2,979
Permit Type:
N/A
Building Type:
N/A
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Chien Sean Yuan License info
License Not Required
| Status | Not Required |
- BuildZoom verified in December, 2021 that this contractor does not need a license to be a contractor in California.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 768216 |
| Status | Inactive |
| State | California |
| Type | General Building |
- 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 Chien Sean Yuan at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $7,500 |
Chien Sean Yuan Employees
CY
Chien Sean Yuan
Sole Owner