Updated: Apr 04, 2026
Location and Projects
Address
21636 KNOLL WAY, Castro Valley, CA, 94546
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Jam Construction
Jam Construction, 21636 Knoll Way, Castro Valley, CA (Employee: Jose Alberto Martinez) holds a General Building license according to the California license board.
Their BuildZoom score of 98 ranks in the top 16% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Jam Construction, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Jam Construction Services
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Jam Construction Contact Information
Phone Number: (925) 339-8080
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Address: 21636 KNOLL WAY, Castro Valley, CA 94546
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Jam Construction Castro Valley
Quality
98
84th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Jam Construction has a BuildZoom score of 98, which places them above 84% of 336,931 contractors in California.
Activity
|
2 projects
|
2023 |
Our building permit records indicate that Jam Construction has worked on at least
2.0 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
|
$50k-$100k |
|
1 project
|
$100k-$250k |
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.
Replace/add windows and doors; replace siding 7/26/22; reduce scope work refund $1, 386.19; al
Valuation:
$115,000
Permit #:
172244
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
New plans to be uploaded- needs to be seen by building/planning/fire again. legalize attached adu that includes:1-bedroom 1 bathroom 1-kitchen. its a 1-story living unit - on-crawl space. total proposed area: 609 sf
Valuation:
$117,324
Permit #:
BL-NRES-2023-00114
Status:
filed
Fee:
$1,400
Permit Type:
N/A
Building Type:
N/A
Full kitchen remodel family room and laundry remodel
Valuation:
$65,000
Permit #:
BD22-1288
Status:
final
Fee:
$2,186
Permit Type:
Addition remodel
Building Type:
N/A
Replace and install 1 (nf) french door and 19 (nf) windows enlarge windows 9 10 11 5 & 6 by lowering sill height and re-route electrical outlet
Valuation:
N/A
Permit #:
BIAL20-001063
Status:
final
Fee:
$630
Permit Type:
N/A
Building Type:
N/A
Nonstructural room remodel one wall - express
Valuation:
$22,480
Permit #:
171097
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Remodel including kitchen bathroom layout changes elsewhere m c f d
Valuation:
$472,000
Permit #:
171407
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Minor construction
Valuation:
N/A
Permit #:
07BLD172
Status:
final
Fee:
$1,608
Permit Type:
N/A
Building Type:
N/A
Kitchen remodel same footprint addition island update plumbing and electrical to code
Valuation:
N/A
Permit #:
BIAL20-005071
Status:
canceled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Jam Construction Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Jam Construction License info
Verified License
| License # | 1058356 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Jam Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
98
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
7
Permits
- Building permit records show that Jam Construction has worked on 7 permitted projects.
Jam Construction Employees
JM
Jose Alberto Martinez
Sole Owner