Updated: May 23, 2026
Location and Projects
Address
20415 THRUST DR, Walnut, CA, 91789
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Sohn, Ki Seo HVAC/Mechanical Contractor
Sohn, Ki Seo, 20415 Thrust Dr, Walnut, CA (Employee: Ki Seo Sohn) holds a license and 1 other license according to the California license board.
Their BuildZoom score of 92 ranks in the top 32% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Sohn, Ki Seo, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Sohn, Ki Seo Contact Information
Phone Number: (909) 815-9633
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Address: 20415 THRUST DR, Walnut, CA 91789
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Citibank. office space. plan check for potable water and waste/vent systems. a= 7.00 psi./100 ft 4 wm 97/82 psi. modify approved plan. change condensate route piping. plan check only. permit issued under 12042-10000-20609
Valuation:
N/A
Permit #:
12042-10001-20609
Status:
approved
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Site preparation and overexcavation for new bank building under 11010-10000-00634. total cut: 1185c.y. fill: 2835c.y. overexcavation: 1350 c.y. refer building permit #11010-10000-00634
Valuation:
N/A
Permit #:
11030-10000-03564
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Tenant improvement- remodel existing kitchen cafeteria and restrooms on ground level of a 5 story building. system includes potable water gas waste and vent
Valuation:
N/A
Permit #:
13042-10000-11250
Status:
plancheck
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Tenant improvemnt. ductwork. customer request plan check. modify approved plans. change ductwork arrangement. plan check only. permit issued 12044-10000-09230
Valuation:
N/A
Permit #:
12044-10001-09230
Status:
approved
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install heating venting and air conditioning equipment in chase bank. customer requested plan check. modify approved plan. change ductwork location
Valuation:
N/A
Permit #:
11044-10001-15144
Status:
approved
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Tenant improvemnt. ductwork. customer request plan check. modify approved plan. addition ahu and ductwork for atm machine room
Valuation:
N/A
Permit #:
12044-10002-09230
Status:
approved
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Citibank. office space. plan check for potable water and waste/vent systems. a= 7.00 psi./100 ft 4 wm 97/82 psi
Valuation:
N/A
Permit #:
12042-10000-20609
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install 3 type-i and one type-ii hoods goodwill cafeteria 1st floor of 5 story building
Valuation:
N/A
Permit #:
13044-10000-05954
Status:
plancheck
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
New building. chase bank 4237 sqft building. heating venting and air conditioning systems. customer request plan check
Valuation:
N/A
Permit #:
11044-10000-14787
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Potable water waste/vent in chase bank. customer requested plan check. modify approved plan. change location of fixtures
Valuation:
N/A
Permit #:
11042-10001-22799
Status:
approved
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Utilize existing hvac units and provide new ductwork. customer request plan check for this system
Valuation:
N/A
Permit #:
11044-10000-14070
Status:
triage
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install heating venting and air conditioning equipment in chase bank. customer requested plan check
Valuation:
N/A
Permit #:
11044-10000-15144
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install potable water and building waste/vent lines. customer request plan check for this system
Valuation:
N/A
Permit #:
11042-10000-21290
Status:
triage
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Construct new 107'-5 x 45'-3 one story type-v-b bank building
Valuation:
N/A
Permit #:
11010-10000-00634
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Potable water and waste/vent system for chase bank. customer requested plan check
Valuation:
N/A
Permit #:
11042-10000-23003
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Sup. permit to 11042-10000-23003 to addition 1 back flow valve
Valuation:
N/A
Permit #:
11042-20004-23003
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Tenant improvemnt. ductwork. customer request plan check
Valuation:
N/A
Permit #:
12044-10000-09230
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
New 11'-4 x 13'-4 x 8 high cmu trash enclosure
Valuation:
N/A
Permit #:
11020-10000-01513
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Sewer tie-in. engineering sewer #s2012810453
Valuation:
N/A
Permit #:
11042-10002-23003
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Potable water waste/vent in chase bank. customer requested plan check
Valuation:
N/A
Permit #:
11042-10000-22799
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Sohn, Ki Seo License info
Verified License
| License # | CAM25618 |
| Status | Active |
| State | California |
- BuildZoom has not verified this license since June, 2015.
Verify this license's status for Sohn, Ki Seo at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 750460 |
| Status | Inactive |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning |
- 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 Sohn, Ki Seo at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
Bonded
| Bonded Agent | Surety Company Of The Pacific |
| Bond Value | $7,500 |
12
Permits
- Building permit records show that Sohn, Ki Seo has worked on 12 permitted projects.
Sohn, Ki Seo Employees
KS
Ki Seo Sohn
Sole Owner