Updated: May 20, 2026
Location and Projects
Address
17 EL CAJON, Lafayette, CA, 94549
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Robert V Williamson Architect
Robert V Williamson, 17 El Cajon, Lafayette, CA (Owned by: Williamson Robert John) holds a General Building license and 5 other licenses according to the California license board.
Their BuildZoom score of 92 ranks in the top 32% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Robert V Williamson, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Robert V Williamson Services
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Robert V Williamson Contact Information
Phone Number: (925) 818-0233
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Address: 17 EL CAJON, Lafayette, CA 94549
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Subdivision subdivision to create 4 lots from 1 legal lot. this project includes a proposal for a street improvement exception from width & slope requirements. this project also includes the installation of underground utilities
Valuation:
$0
Permit #:
CDP91-0053HIST
Status:
Approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Lla/smn/cdp/sie lla/smn/cdp/sie applicant proposes to adjust lot lines and then subdivide one lot into four. this project includes a proposal for a street improvement exception to lower the maximum grade of a private access road from 27% to 23.5% where 15% is the maximum allowable. the project also includes a sewer and water main extension and the installation of underground utilities... see more
Valuation:
$0
Permit #:
ENV91-0328HIST
Status:
Finaled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Maintenance building foundation only: no mep's
Valuation:
$150,000
Permit #:
B142185
Status:
final
Fee:
$3,204
Permit Type:
N/A
Building Type:
N/A
Remodel mud room/laundry into breakfast room, remodel kitchen, new laundry and bath in existing breakfast room area. added plumbing added plumbing, mechanical and electrical permits on 7/25/03 sw1
Valuation:
$21,186
Permit #:
B2002-03539
Status:
Closed Expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
23.5% slope request to create a private road which would have a maximum slope of 23.5% where 15% is the maximum allowable. currently the road has a maximum of 27%
Valuation:
$0
Permit #:
SIE91-0002HIST
Status:
Approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
4 lots from 1 applicant proposes to adjust lot lines and then to subdivide one of the newly reconfigured legal lots into four new lots
Valuation:
$0
Permit #:
SMN91-0017HIST
Status:
Approved
Fee:
$4,586
Permit Type:
N/A
Building Type:
N/A
2 doors 2 windows move wall
Valuation:
$8,000
Permit #:
BPA11-399
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace water heater
Valuation:
$1,300
Permit #:
BPA12-350
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Greater north park. new interior non-bearing walls refinish concrete flooring new bar and interior finishes in existing restuarant******mccpd cn-1*****
Valuation:
$1,092
Permit #:
421309
Status:
complete
Fee:
$1,319
Permit Type:
Add/alt tenant im...
Building Type:
N/A
Code codeenf: code enforcement violation code: code enforcement
2010-11-17
Email complaint from prior tenant who has already moved out. see email attachment.
Valuation:
N/A
Permit #:
CE-101776
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Permit issued to replace closed permit # 02-3539 per brad rudolph building inspector. clw
Valuation:
$6,000
Permit #:
B2003-04014
Status:
Closed Complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Convert existing roof level storage room to laundry room for fraternaity house
Valuation:
$1,000
Permit #:
B2007-02021
Status:
Closed Expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Lla lot line adjustment to adjust the lot lines between 4 existing legal lots
Valuation:
$0
Permit #:
LLA92-0001HIST
Status:
Approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen remodel bathroom remodel new heater system electrical
Valuation:
$12,000
Permit #:
97-3825
Status:
N/A
Fee:
$2,051
Permit Type:
Alteration
Building Type:
N/A
Response to swn2000-00157 - replace heater/furnace
Valuation:
$2,000
Permit #:
MEC2001-00111
Status:
Finaled
Fee:
$62
Permit Type:
N/A
Building Type:
N/A
New carport for 28 claremont & slab on grade
Valuation:
$8,000
Permit #:
97-3828
Status:
N/A
Fee:
$284
Permit Type:
Addition
Building Type:
N/A
Carport for 30 claremont & new concrete driveway
Valuation:
$3,000
Permit #:
97-3826
Status:
N/A
Fee:
$136
Permit Type:
New
Building Type:
N/A
Furnace and ducts
Valuation:
$0
Permit #:
SWN2000-00157
Status:
Permit Finaled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Move single family residence from 20 avondale to 28 claremon
Valuation:
$0
Permit #:
97-1234
Status:
N/A
Fee:
$40
Permit Type:
Move
Building Type:
N/A
Rear deck repair
Valuation:
$6,800
Permit #:
BPA11-323
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Robert V Williamson License info
Verified License
| License # | 1155376 |
| Status | Active |
| State | California |
| Type | General Building |
| Date Issued | 05-18-2026 |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Robert V Williamson at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 832969 |
| Status | Active |
| State | California |
| Type | General Building, Elevator Installation |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Robert V Williamson at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | C30784 |
| Status | Active |
| State | California |
| Type | Architect |
| Business Type | Sole Ownership |
- When BuildZoom last verified this license, it had an expiration date of December, 2025. Check the current license status of Robert V Williamson with the California Architect License Board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 366330 |
| Status | Inactive |
| State | California |
| Type | Plumbing |
| 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 Robert V Williamson at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 932977 |
| Status | Inactive |
| State | California |
| Type | Plumbing |
| 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 Robert V Williamson at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | C9048 |
| 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 Robert V Williamson at the California Architect License Board.
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $12,500 |
12
Permits
- Building permit records show that Robert V Williamson has worked on 12 permitted projects.
Robert V Williamson Employees
FW
Frank Archie Williamson
Sole Owner
RW
Robert Alan Williamson
Sole Owner
RW
Robert John Williamson
Sole Owner
RW
Robert Vaughn Williamson
Sole Owner
WI
Williamson Robert Iii
Owner
WJ
Williamson Robert John
Owner