Updated: Mar 27, 2026
Location and Projects
Address
21710 LOST RIVER DRIVE, Diamond Bar, CA, 91765
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Qi Tian Construction
Qi Tian, 21710 Lost River Dr, Diamond Bar, CA (Employees: Mark Tian and Mark Tian) holds a General Building license according to the California license board.
Their BuildZoom score of 97 ranks in the top 18% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Qi Tian, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Qi Tian Services
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Qi Tian Contact Information
Phone Number: (714) 269-4581
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Address: 21710 LOST RIVER DRIVE, Diamond Bar, CA 91765
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This is a sample of this contractor's permits. Click here to access their complete permit history.
(e-plan) unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets counter tops and backsplash. bathroom re-tile. cp2001148
Valuation:
$12,000
Permit #:
BS2003001
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
(e-plan) unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets counter tops and backsplash. bathroom re-tile. cp2001148
Valuation:
$12,000
Permit #:
BS2003001
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
Unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets countertops and backsplash. bathroom re-tile
Valuation:
$12,000
Permit #:
BS2003003
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
Unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets countertops and backsplash. bathroom re-tile
Valuation:
$12,000
Permit #:
BS2003003
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
Unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets countertops and backsplash. bathroom re-tile
Valuation:
$12,000
Permit #:
BS2003002
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
Unit 403 - kitchen remodel. opened up wall to replace with island replaced floor tile cabinets countertops and backsplash. bathroom re-tile
Valuation:
$12,000
Permit #:
BS2003002
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
Manufactured low-med
Convert attached garage to adu (393 sq ft)
Valuation:
N/A
Permit #:
MEC22-01230
Status:
final
Fee:
$87
Permit Type:
N/A
Building Type:
N/A
Convert attached garage to adu (393 sq ft)
Valuation:
N/A
Permit #:
ELE22-02504
Status:
final
Fee:
$205
Permit Type:
N/A
Building Type:
N/A
Convert attached garage to adu (393 sq ft)
Valuation:
N/A
Permit #:
PLM22-01235
Status:
final
Fee:
$164
Permit Type:
N/A
Building Type:
N/A
R3/u1: create new laundry room; enlarge existing bedroom
Valuation:
N/A
Permit #:
PLM22-01234
Status:
complete
Fee:
$50
Permit Type:
N/A
Building Type:
N/A
R3/u1: create new laundry room; enlarge existing bedroom
Valuation:
N/A
Permit #:
MEC22-01229
Status:
complete
Fee:
$50
Permit Type:
N/A
Building Type:
N/A
R3/u1: create new laundry room; enlarge existing bedroom
Valuation:
N/A
Permit #:
ELE22-02503
Status:
final
Fee:
$91
Permit Type:
N/A
Building Type:
N/A
(1) (bld21-002053) plan check for single family - residential rehab to include structural repairs to floor joists and beams replace ceiling drywall (60 sf) and replace (3) sinks and (3) toilets. (mold report electrical certification and hvac certification required at inspections)
Valuation:
N/A
Permit #:
BPC21-000389
Status:
final
Fee:
$174
Permit Type:
S-fam residential
Building Type:
N/A
R3/u1: create new laundry room; enlarge existing bedroom
Valuation:
$2,000
Permit #:
BLD19-00329
Status:
final
Fee:
$262
Permit Type:
N/A
Building Type:
N/A
Reinstate exp permit bld2017-00358 for new bedroom #3 & #4
Valuation:
N/A
Permit #:
RES2019-00147
Status:
final
Fee:
N/A
Permit Type:
Remodel
Building Type:
N/A
Convert attached garage to adu (393 sq ft)
Valuation:
$35,000
Permit #:
BLD19-00328
Status:
final
Fee:
$4,267
Permit Type:
N/A
Building Type:
N/A
Replace (22) windows to new vinyl windows (same size & location). comply with department order effective date 03/13/17. permit will expire 30 days from issuance date
Valuation:
N/A
Permit #:
17016-10000-08217
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Edr 665sf tenant improvement for shouyi hair design
Valuation:
N/A
Permit #:
PMT2019-04705
Status:
final
Fee:
$1,638
Permit Type:
N/A
Building Type:
N/A
(1) permit for rehab of sfd; repairs to floor joists - & beams replace ceiling drywall (60 sf) & direct change out of (3) sinks & (3) toilets (mold report electrical and hvac certifications required at inspections)
Valuation:
N/A
Permit #:
BLD21-002053
Status:
final
Fee:
$547
Permit Type:
S-fam residential
Building Type:
N/A
Commercial. tenant improvement. massage yee & spa-shower rm/2 treatment rms/floor
Valuation:
$10,000
Permit #:
B2017-0108
Status:
final
Fee:
$480
Permit Type:
Remodel
Building Type:
N/A
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Qi Tian Reviews
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Verified License
BuildZoom confirmed this contractor's license
Qi Tian License info
Verified License
| License # | 971912 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Qi Tian at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
97
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
14
Permits
- Building permit records show that Qi Tian has worked on 14 permitted projects.
Qi Tian Employees
MT
Mark Tian
Sole Owner
MT
Mark Tian
Sole Owner
QT
Qi Tian
Owner