Updated: Apr 24, 2026
Location and Projects
Address
1000 DETROIT AVE "S", Concord, CA, 94518
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Bestoff Windows Inc
Bestoff Windows Inc, 1000 Detroit Ave S, Concord, CA (Employee: Sergey Leonid Oreshkin) holds a General Building, Glazing license and 1 other license according to the California license board.
Their BuildZoom score of 99 ranks in the top 15% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Bestoff Windows Inc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Bestoff Windows Inc Contact Information
Phone Number: (925) 288-9100
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Address: 1000 DETROIT AVE "S", Concord, CA 94518
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace 30 windows 2 patio doors
Valuation:
$34,000
Permit #:
M21-026305
Status:
final
Fee:
$694
Permit Type:
N/A
Building Type:
N/A
Replacement of (7) windows and a sliding door. (4) of the windows are fill replacement for egress & the rest are retrofits
Valuation:
$6,045
Permit #:
B190026
Status:
final
Fee:
$401
Permit Type:
N/A
Building Type:
N/A
Remove and replace 10 windows and 2 patio door same size and location
Valuation:
N/A
Permit #:
BIAL19-000419
Status:
final
Fee:
$430
Permit Type:
N/A
Building Type:
N/A
(1) window retro fit and (2) sliding doors
Valuation:
$5,192
Permit #:
B194721
Status:
final
Fee:
$380
Permit Type:
N/A
Building Type:
N/A
Retrofit installation of 8 windows and 2 sliding doors
Valuation:
N/A
Permit #:
BIAL19-008942
Status:
final
Fee:
$513
Permit Type:
N/A
Building Type:
N/A
21 window retrofit windows 1 patio door
Valuation:
$14,071
Permit #:
BP18-0407
Status:
final
Fee:
N/A
Permit Type:
Windows - replace...
Building Type:
N/A
Residence building replace (16) windows and (1) patio door retrofi
Valuation:
$6,026
Permit #:
BD19-0887
Status:
expired
Fee:
$534
Permit Type:
Windows
Building Type:
N/A
Building new construction additions alterations or sign
2018-05-03
Retrofit windows replacement
Valuation:
$7,416
Permit #:
B180599
Status:
final
Fee:
$458
Permit Type:
Alteration
Building Type:
N/A
Replace 7 windows and 1 sliding patio door, 3 windows retrofit, 4 windows and patio door full replacement.
Valuation:
$5,633
Permit #:
B153566
Status:
final
Fee:
$275
Permit Type:
N/A
Building Type:
N/A
Retrofit replacement of 7 windows & full replacement of 2 sliding doors (no structural changes)
Valuation:
$6,317
Permit #:
B181525
Status:
issued
Fee:
$469
Permit Type:
N/A
Building Type:
N/A
Replacement of 9 windows and 1 sliding glass door downstairs and 7 windows upstairs per plans
Valuation:
$6,475
Permit #:
BIAL16-011309
Status:
final
Fee:
$334
Permit Type:
N/A
Building Type:
N/A
Retrofit windows and sliding doors replacement like to like fourteen windows and 3 doors
Valuation:
N/A
Permit #:
BIAL17-006487
Status:
final
Fee:
$597
Permit Type:
N/A
Building Type:
N/A
Retro-fit relacement of (3) windows and full replacement (new construction style) of (7) patio doors (same size and locations)
Valuation:
N/A
Permit #:
BIAL13-006661
Status:
final
Fee:
$397
Permit Type:
N/A
Building Type:
N/A
Retro fit and replace of (18) windows. replace (3) patio doors. like to like
Valuation:
$14,873
Permit #:
B170644
Status:
final
Fee:
$445
Permit Type:
N/A
Building Type:
N/A
Retrofit replacement 3 windows and 1 sliding door like for like same location
Valuation:
N/A
Permit #:
BIAL17-012857
Status:
final
Fee:
$240
Permit Type:
N/A
Building Type:
N/A
Remove and replace 7 windows and 3 sliding doors same size and location
Valuation:
N/A
Permit #:
BIAL17-013143
Status:
final
Fee:
$494
Permit Type:
N/A
Building Type:
N/A
Full replacement of 24 windows and one patio door like for like
Valuation:
N/A
Permit #:
BIAL17-001595
Status:
final
Fee:
$748
Permit Type:
N/A
Building Type:
N/A
Remove and replace 5 sliding doors 4 windows same size and location
Valuation:
N/A
Permit #:
BIAL17-012052
Status:
final
Fee:
$528
Permit Type:
N/A
Building Type:
N/A
Remove and replace 16 windows retrofit same size and location
Valuation:
N/A
Permit #:
BIAL17-012207
Status:
final
Fee:
$460
Permit Type:
N/A
Building Type:
N/A
Window replacment - r/r 12 windows like for like size for size aluminum for vinyl
Valuation:
$6,500
Permit #:
B15-0766
Status:
final
Fee:
$504
Permit Type:
N/A
Building Type:
N/A
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Bestoff Windows Inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
Bestoff Windows Inc License info
Verified License
| License # | 769183 |
| Status | Active |
| State | California |
| Type | General Building, Glazing |
| Business Type | Corporation, Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Bestoff Windows Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 992647 |
| Status | Active |
| State | California |
| Type | Glazing |
| Business Type | Corporation, Sole Ownership |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Bestoff Windows Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
99
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
68
Permits
- Building permit records show that Bestoff Windows Inc has worked on 68 permitted projects.
Bestoff Windows Inc Employees
SO
Sergey Leonid Oreshkin
Rmo / Ceo / Pres