Updated: Jun 12, 2026
Location and Projects
Address
18305 PEPPER ST, Castro Valley, CA, 94549
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William Stephenson Development Architect
William Stephenson Development at 18305 PEPPER ST, Castro Valley, CA 94549, held a Architect license (#C20496) with the California contractors license board with an expiration date of 09-30-2017. We last verified the license was expired on 03-14-2025.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our bidding system to be easily matched to qualified, licensed professionals in your area.
William Stephenson Development Services
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William Stephenson Development Contact Information
Phone Number: (925) 788-8085
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Address: 18305 PEPPER ST, Castro Valley, CA 94549
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Building Permits by William Stephenson Development
This is a sample of this contractor's permits. Click here to access their complete permit history.
Renewal permit covering bld2002-03726 for complete kitchen & 2 bathroom remodel. new electrical wiring (12 exist and 8 new circuits) new 125a meter. new copper plumbing supply from meter to inside of dwelling. replace furnace. new insulation and sheetrock at walls. (re-use exist kit cabinets). original valuation $35, 000
Valuation:
N/A
Permit #:
BLD2004-02147
Status:
FINALED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Complete kitchen & 2 bathroom remodel. new electrical wiring (12 exist and 8 new circuits) new 125a meter. new copper plumbing supply from meter to inside of dwelling. replace furnace. new insulation and sheetrock at walls. (re-use exist kit cabinets)
Valuation:
N/A
Permit #:
BLD2002-03726
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition bedroom and office on 1st floor 2 bedrooms bathroom and recreation room on second floor. remodeling from 4 bedroom to 5 bedrooms. 1189 sq ft. addition
Valuation:
$80,800
Permit #:
BLD2006-00024
Status:
Finaled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel create powder room window alteration. elect: 3 circuits 5 incand./2 fluor fixtures 7 switches 2 recept 2 fans
Valuation:
N/A
Permit #:
RE0501738
Status:
final
Fee:
$124
Permit Type:
N/A
Building Type:
N/A
Renew expired plan check bld03-1363 new communications facility 15 monopole 2 equipment cabinets 1 pad
Valuation:
N/A
Permit #:
BLD04-3409
Status:
final
Fee:
$3,541
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel create powder room window alteration. elect: 3 circuits 5 incand./2 fluor fixtures 7 switches 2 recept 2 fans
Valuation:
N/A
Permit #:
RE0501738
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Framing modifications - vault kitchen ceiling raise hall ceiling and install skylight raise header to in dinning room to be flush with ceiling
Valuation:
N/A
Permit #:
BLD2003-00712
Status:
EXPIRED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel create powder room window alteration. plumbing: 2 toilets 2 lavys 1 tub
Valuation:
N/A
Permit #:
RP0501445
Status:
final
Fee:
$165
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel create new bathroom window alteration
Valuation:
$20,000
Permit #:
RB0502209
Status:
final
Fee:
$1,284
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel create powder room window alteration. plumbing: 2 toilets 2 lavys 1 tub
Valuation:
N/A
Permit #:
RP0501445
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel(fixtures, counter, cabinets)
Valuation:
$15,000
Permit #:
RB0804363
Status:
final
Fee:
$1,199
Permit Type:
N/A
Building Type:
N/A
Electrical and plumbing for bathroom remodel
Valuation:
N/A
Permit #:
RE0803086
Status:
final
Fee:
$151
Permit Type:
N/A
Building Type:
N/A
Electrical and plumbing for bathroom remodel
Valuation:
N/A
Permit #:
RP0802502
Status:
final
Fee:
$258
Permit Type:
N/A
Building Type:
N/A
Permit value$20k bathroom remodel create new bathroom window alteration
Valuation:
N/A
Permit #:
RB0502209
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Waterheater changeout (p)
Valuation:
N/A
Permit #:
PL01-0136
Status:
final
Fee:
$63
Permit Type:
Oth
Building Type:
N/A
Site retaining wall per plans. approx. 70 linear ft. - max. 4 high
Valuation:
N/A
Permit #:
BLD2003-02593
Status:
FINALED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel
Valuation:
N/A
Permit #:
BIAL0000204339
Status:
expired
Fee:
$338
Permit Type:
N/A
Building Type:
N/A
Bathroom remodeling bathroom remodel(fixtures, counter, cabinets)
Valuation:
N/A
Permit #:
RB0804363
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodeling electrical and plumbing for bathroom remodel
Valuation:
N/A
Permit #:
RE0803086
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Bathroom remodeling electrical and plumbing for bathroom remodel
Valuation:
N/A
Permit #:
RP0802502
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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William Stephenson Development License info
Inactive License
| License # | C20496 |
| Status | Inactive |
| State | California |
| Type | Architect |
| Business Type | Sole Ownership |
- According to the California Architect 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 William Stephenson Development at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 588819 |
| Status | Inactive |
| State | California |
| Type | Concrete |
| Business Type | Sole Ownership |
- 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 William Stephenson Development at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 706458 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- 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 William Stephenson Development at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
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- *No active license on file. If you are William Stephenson Development, click “This is My Business” to update your information.
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
8
Permits
- Building permit records show that William Stephenson Development has worked on 8 permitted projects.
William Stephenson Development Employees
SD
Stephenson William Dunlap
Owner
WS
William Dunlap Stephenson
Owner
WS
William James Stephenson
Owner