Updated: May 21, 2026
Location and Projects
Address
23051 ASPEN KNOLL DR, Diamond Bar, CA, 91765
Use our bidding system to
request a quote
Kwon Yong Ju Architect
Kwon Yong Ju, 23051 Aspen Knoll Dr, Diamond Bar, CA (Employees: Yong Ju Kwon and Yong Kwon Pak) holds a Architect license and 2 other licenses according to the California license board.
Their BuildZoom score of 103 ranks in the top 10% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Kwon Yong Ju, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Kwon Yong Ju Services
Start a project today:
Kwon Yong Ju Contact Information
Phone Number: (213) 365-1145
Edit
Address: 23051 ASPEN KNOLL DR, Diamond Bar, CA 91765
Edit
Do you work for this business? Unlock this free profile to update company info and see who's viewing your profile.
Kwon Yong Ju Diamond Bar
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Kwon Yong Ju has a BuildZoom score of 103, which places them above 90% of 336,931 contractors in California.
Activity
|
6 projects
|
2025 |
|
2 projects
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Kwon Yong Ju has worked on at least
9.0 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
|
3 projects
|
< $5k |
|
3 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
1 project
|
$1mil+ |
The typical size of their permits is approximately $11,000. 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.
Remodel change of use from (e) apartment to adult residential facility and addition to connect to (e) adult residential facility to create a 61 unit adult residential facility. a non-profit affordable housing funded by california department of social services
Valuation:
$4,000,000
Permit #:
24014-10000-02941
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Residential supplemental fees - 379 sq ft addition to detached garage and convert (e) 377 sq ft detached garage into (n) 756 sq ft (2) bedroom (2) bathroom attached adu ref: comr-2025-0306 sanitation fee 379 sqft x $1.659 = $628.76
Valuation:
N/A
Permit #:
MIS-2025-0527
Status:
complete
Fee:
$629
Permit Type:
N/A
Building Type:
N/A
Supplemental to permit 24014-10000-02941 to reduce the addition to reduce the number of units to remove the wood deck and to revise the strucutral framing and foundation plans
Valuation:
$1,000
Permit #:
24014-10001-02941
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Residential supplemental fees - proposed adu : 1 story 649 sf 1st floor : 507 sf mezzanine: 142 sf. sanitation fee 649 sqft x $1.695 = $1 100.06
Valuation:
N/A
Permit #:
MIS-2025-0819
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Convert existing part of the first floor retail space to youth hostel
Valuation:
$75,000
Permit #:
25016-10000-22214
Status:
triage
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Supplemental to permit#23010-10000-03593 to allow 7'0 minimum ceiling height of the habitable living room bed room an hall area (section 1208.2) in lieu of 7'6
Valuation:
$501
Permit #:
23010-10001-03593
Status:
applied
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
***eplan***: convert existing storage to (1) adu at 1st floor on existing 10 units apartment with 5 car garage
Valuation:
$30,000
Permit #:
23010-10000-03593
Status:
issued
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
(eplan) convert an existing office space to an accessory dwelling unit in apartment building per ca government code 65852.2(e)(1)(c)
Valuation:
$15,000
Permit #:
22016-10000-09467
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Addition 2-story duplex to existing 2-story single family dwelling to create a 3-unit apartment with two 2-car attached garage
Valuation:
N/A
Permit #:
19014-10000-05415
Status:
approved
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Convert existing 4 unit apartment to 5 room youth hostel in the adaptive reuse incentive area
Valuation:
$9,000
Permit #:
24016-10000-08067
Status:
triage
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Eplan: replace and alter 2nd floor deck in (e) 2-story apartment
Valuation:
$11,000
Permit #:
22020-10000-01359
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Interior/ecterior remodel of (e) ground floor unit in (e) three-unit two-story apartment. scope of work to include one new bathroom in (e) bedroom repair damaged stucco and replacing kitchen cabinet and replace (e) windows (same size/type)
Valuation:
N/A
Permit #:
18016-10000-06830
Status:
triage
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Tenant improvement of existing clinic to provide dental section (665 sf) no change in parking
Valuation:
$40,000
Permit #:
17016-10000-24254
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
1st and 2nd story addition of 3 new bedrooms and 4 bathrooms 1786 s.f. garage addition 286 s.f new deck 563 s.f. and remodeling 500 s.f
Valuation:
$325,000
Permit #:
1605050016
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
1st and 2nd story addition of 3 new bedrooms and 4 bathrooms 1786 s.f. garage addition 286 s.f new deck 563 s.f. and remodeling 500 s.f
Valuation:
$325,000
Permit #:
1605050016
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
1st and 2nd story addition of 3 new bedrooms and 4 bathrooms 1786 s.f. garage addition 286 s.f new deck 563 s.f. and remodeling 500 s.f
Valuation:
$325,000
Permit #:
1605050016
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Supplemental permit to 15016-10000-08871| revise floor plan to show only 650sq.ft. of (e) garage is converted to (n) storage| 276sq.ft. of (e) garage is converted to porch| revise (n) nonbearing wall location with new footing
Valuation:
$501
Permit #:
15016-10001-08871
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Convert (e) enclosed 3-car garage to (n) storage room| restripe rear yard to provide uncovered parkings: (3) compacts+ (1) standard stall| (n) footing and (n) wall infills at original garage openings|
Valuation:
$5,000
Permit #:
15016-10000-08871
Status:
complete
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Interior work at second story of existing duplex. addition new bathroom to existing bedroom. convert portion of living room to 1 new bedroom with new bathroom and closet. new non-bearing partitions
Valuation:
$15,000
Permit #:
15016-10000-02361
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Tenant improvement. dental office with medical gas 2468-sqft
Valuation:
$200,000
Permit #:
COMBC-2021-00115
Status:
final
Fee:
$13,997
Permit Type:
N/A
Building Type:
N/A
Similar Contractors See more
License # C29302
Los Angeles, CA
178
BZ Score
$25K
Avg Project
-
Projects
151
BZ Score
$109K
Avg Project
-
Projects
License # 16041
Marina Del Rey, CA
149
BZ Score
$85K
Avg Project
-
Projects
Kwon Yong Ju Reviews
BuildZoom hasn't received any reviews for Kwon Yong Ju. Click here to be alerted when reviews are posted about them.
Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Kwon Yong Ju License info
Verified License
| License # | C25108 |
| Status | Active |
| State | California |
| Type | Architect |
- BuildZoom has not verified this license since May, 2025.
Verify this license's status for Kwon Yong Ju at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 638469 |
| 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 Kwon Yong Ju at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 418044 |
| 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 Kwon Yong Ju at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
Bonded
| Bonded Agent | Surety Company Of The Pacific |
| Bond Value | $7,500 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
74
Permits
- Building permit records show that Kwon Yong Ju has worked on 74 permitted projects.
Kwon Yong Ju Employees
KJ
Kwon Yong Ju
Owner
YK
Yong Ju Kwon
Sole Owner
YP
Yong Kwon Pak
Sole Owner