Updated: Jan 28, 2026
Location and Projects
Address
3641 MT DIABLO BLVD 951, Lafayette, CA, 94549
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O S Builder Construction
Serving Lafayette and the surrounding Contra Costa County area, O S Builder specializes in residential construction projects ranging from renovations to new home builds. With 9 years of experience, the company manages all phases of construction, working closely with homeowners to deliver tailored solutions for kitchens, bathrooms, and whole-house remodeling. O S Builder is known for its experience in managing both interior and exterior projects on single-family homes, including structural upgrades and custom finish work. The firm takes on projects of varying scales, offering detailed project management and consistent communication throughout the process. O S Builder works primarily with residential clients in Lafayette and neighboring communities, providing a direct point of contact for project planning, budgeting, and scheduling from start to finish.
O S Builder Services
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O S Builder Contact Information
Phone Number: (925) 899-7597
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Address: 3641 MT DIABLO BLVD 951, Lafayette, CA 94549
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O S Builder Lafayette
Quality
95
78th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
O S Builder has a BuildZoom score of 95, which places them above 78% of 336,931 contractors in California.
Activity
|
1 project
|
2023 |
Our building permit records indicate that O S Builder has worked on at least
1.0 project 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
|
$50k-$100k |
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.
Renovating bathroom on ground floor of samiaha ghosh residential home. non structural shower new vanity sink new shower using exstg drain and adding a new toilet using extg sewer. minor electrical additions will be 4 can lights 2 switches and 2 outlets
Valuation:
$50,000
Permit #:
202008131743
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
500 sq ft interior remodel of kitchen pantry mud room 2 bathrooms and laundry room. all work occurs within the existing building envelope except for 3 new windows and 1 exterior door **9/22/22 delta 3 revisions per revised plans: expands the (n) laundry room by 17 sq ft for a total remodeled area of 517 sq ft. this revision affects an (e) exterior door and window at the rear yard unde... see more
Valuation:
N/A
Permit #:
BIAL21-006086
Status:
final
Fee:
$4,720
Permit Type:
N/A
Building Type:
N/A
Bathroom upgrade minor electrical addition/repairs. install 4 can lights 2 switches & 2 outlets
Valuation:
N/A
Permit #:
E20201020005
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Renew permit pa 201705035640to complete work. remodel kitchen lower bathrooms in kind
Valuation:
$100,000
Permit #:
201905150742
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Bathroom remodel facelift
Valuation:
$60,000
Permit #:
BISUB23-00544
Status:
permit review initiated
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
E201803151697 to complete work started on permit e201803151697. new contractor
Valuation:
N/A
Permit #:
E201905151298
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel bathroom
Valuation:
N/A
Permit #:
PP20201020539
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Building new construction additions alterations or sign
2019-05-10
R/r existing wood railing with glass
Valuation:
$15,000
Permit #:
B181781
Status:
final
Fee:
$576
Permit Type:
Alteration
Building Type:
N/A
Remodel master bathroom & office remodel per plan and new windows doors & skylights per plans
Valuation:
N/A
Permit #:
BIAL23-005398
Status:
plancheck
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Interior remodel. remodel master bathroom & guest bathroom. create 1/2 bathroom in lower level. remodel kitchen and remove a portion of non-bearing wall in kitchen area
Valuation:
$62,000
Permit #:
201705035640
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Repair damaged garage entry replace shingles and header like for like
Valuation:
$10,000
Permit #:
BIRP18-008681
Status:
final
Fee:
$463
Permit Type:
N/A
Building Type:
N/A
Street space
Valuation:
$1
Permit #:
M1158387
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
-
To complete work outlined on permit pp20180315690. interior remodel kitchen and 2 bathrooms
Valuation:
N/A
Permit #:
PP20190515821
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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O S Builder Reviews
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Verified License
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O S Builder License info
Verified License
| License # | 1020394 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of January 2026.
Verify this license's status for O S Builder at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
Bonded
| Bonded Agent | Wesco Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Everest Premier Insurance Company |
7
Permits
- Building permit records show that O S Builder has worked on 7 permitted projects.
O S Builder Employees
AJ
Amber Sierra Johnson
Officer
AJ
Aprile Elizabeth Johnson
Officer
CJ
Cassandra Marie Johnson
Officer
TJ
Troy Robert Johnson
Sole Owner