Updated: Jul 16, 2026
Location and Projects
Address
1207 PORTO GRANDE UNIT 6, Diamond Bar, CA, 91765
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Apex Construction
Serving Southern California for over three decades, Apex Construction operates out of Diamond Bar, CA, providing general construction services to residential and commercial clients. The firm’s portfolio includes new home construction, room additions, kitchen remodels, and bathroom renovations. Apex Construction also manages commercial tenant improvements, including build-outs for retail and office spaces. The company emphasizes project management and coordination, handling all phases from initial planning and permitting through construction and final inspection. Apex Construction works directly with property owners, architects, and engineers to ensure project requirements are met per local building codes. With 38 years in the region, the firm has experience navigating permitting processes for various cities in Los Angeles County.
Apex Construction Services
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Apex Construction Contact Information
Phone Number: (213) 256-5788
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Address: 1207 PORTO GRANDE UNIT 6, Diamond Bar, CA 91765
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Apex Construction Diamond Bar
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Apex Construction has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
2 projects
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Apex Construction has worked on at least
3.0 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
|
$5k-$20k |
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.
Combo residential – building – alteration (includes meps)
2024-07-17
Replace (4) 2 ton mini split system replace (e) window like for like hers testing required for refrigerant charge u-factor = 0.30 or less shgc = 0.23 or less. as per approved site plan
Valuation:
$18,500
Permit #:
COMR-2024-0323
Status:
complete
Fee:
$1,189
Permit Type:
N/A
Building Type:
N/A
Supplemental permit to permit #23044-10000-05615 to: addition (10) air handlers to existing fan coil and mini split
Valuation:
N/A
Permit #:
23044-10001-05615
Status:
issued
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Full house plus - ten imp: renovate space to crate restuarant; install new equipment repair all walls and railings at patio
Valuation:
$45,000
Permit #:
PLM21-01035
Status:
complete
Fee:
$106
Permit Type:
N/A
Building Type:
N/A
Full house plus - ten imp: renovate space to crate restuarant; install new equipment repair all walls and railings at patio
Valuation:
$45,000
Permit #:
MEC21-00962
Status:
complete
Fee:
$153
Permit Type:
N/A
Building Type:
N/A
Full house plus - ten imp: renovate space to crate restuarant; install new equipment repair all walls and railings at patio
Valuation:
$45,000
Permit #:
ELE21-01825
Status:
complete
Fee:
$106
Permit Type:
N/A
Building Type:
N/A
Full house plus - ten imp: renovate space to crate restuarant; install new equipment repair all walls and railings at patio
Valuation:
$45,000
Permit #:
BLD21-02020
Status:
complete
Fee:
$4,350
Permit Type:
N/A
Building Type:
N/A
Construct attached addition of 4 258 sq ft enclose ex 192 sq ft patio and tenant improvement of ex sanctuary to become multipurpose room. addition to become new sanctuary with restrooms utility room & (2) classrooms media room & mother/child room: enclosed patio to become office also expansion of ex parking lot accessory to existing church
Valuation:
$261,530
Permit #:
K201708276
Status:
issued
Fee:
$11,782
Permit Type:
N/A
Building Type:
N/A
Hd collection mini split air conditioning power dicon sw circuits each 15amps 120v 10 ea
Valuation:
N/A
Permit #:
23041-10000-22588
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
>>supplement to mec21-00962<< full house plus - ten imp: install kitchen hood
Valuation:
N/A
Permit #:
MEC22-00156
Status:
issued
Fee:
$153
Permit Type:
N/A
Building Type:
N/A
Aka 305 forest: tenant improvement. * new service counter kitchen prepared/wash will be installed; no kitchen hood to be installed; no exterior changes; change of use from retail to cafe/takeout (harmony tea bar.) *provide accessible restroom; ramp not to exceed 8.33%; health approval required*
Valuation:
$70,000
Permit #:
CBP-2017-0390
Status:
final
Fee:
N/A
Permit Type:
Tenant improvement
Building Type:
N/A
10 mini split and 1 wall heater
Valuation:
N/A
Permit #:
23044-10000-05615
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Construct dettached 484 sqft adu to rear of the existing single family residence
Valuation:
$59,271
Permit #:
B2001400
Status:
plancheck
Fee:
$2,679
Permit Type:
N/A
Building Type:
N/A
Convert (e) utility room to (n) bedroom window replace with (n) vinyl window (same size/style) kitchen remodel bathroom fixtures replacement
Valuation:
$20,000
Permit #:
19016-10000-11761
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
422.5 sft addition to rear of dwelling - demolish 144 sft bedroom ; attached north patio solid - 261 sf see b1901634 - approved
Valuation:
$0
Permit #:
THR19-163
Status:
approved
Fee:
$153
Permit Type:
N/A
Building Type:
N/A
Re-wire entire house and service panel upgrade to 200 amps
Valuation:
N/A
Permit #:
1706060017
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen hood
Valuation:
N/A
Permit #:
M24-0031
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Shower sink toilet
Valuation:
N/A
Permit #:
P24-0021
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Rec:2 light: 16 sw: 4 dishwasher clotheswasher oven dryer
Valuation:
N/A
Permit #:
E24-0020
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen and bathroom remodel- code officer jason c
Valuation:
$20,000
Permit #:
B24-0057
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repairs to existing church due to fire (refer to kfs2017140) and construct a 126 sq ft entryway addition to same
Valuation:
$307,271
Permit #:
K201804242
Status:
issued
Fee:
$4,553
Permit Type:
N/A
Building Type:
N/A
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Apex Construction Reviews
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Verified License
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Apex Construction License info
Verified License
| License # | 1074739 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Apex Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 991317 |
| Status | Active |
| State | California |
| Type | General Building, Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Apex Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 719518 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Apex Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 920301 |
| 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 Apex Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 875819 |
| 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 Apex Construction 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 | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
30
Permits
- Building permit records show that Apex Construction has worked on 30 permitted projects.
Apex Construction Employees
DO
David Kwangtak Oh
Rmo
GI
Gabriel Isaia
Sole Owner
GI
Gabriel Isaia
Sole Owner
JS
Jae Myung Shin
Sole Owner
KS
Kun Ho Shin
Officer
KC
Kyung Taek Chung
Sole Owner